Remove the distinction of inbound handlers and outbound handlers

- Fixes #1808
- Move all methods in ChannelInboundHandler and ChannelOutboundHandler up to ChannelHandler
- Remove ChannelInboundHandler and ChannelOutboundHandler
- Deprecate ChannelInboundHandlerAdapter, ChannelOutboundHandlerAdapter, and ChannelDuplexHandler
- Replace CombinedChannelDuplexHandler with ChannelHandlerAppender
  because it's not possible to combine two handlers into one easily now
- Introduce 'Skip' annotation to pass events through efficiently
- Remove all references to the deprecated types and update Javadoc

buffer/src/main/java/io/netty/buffer/package-info.java

@@ -75,13 +75,13 @@
  * type.
  * <pre>
  * // The composite type is compatible with the component type.
- * {@link ByteBuf} message = {@link Unpooled}.wrappedBuffer(header, body);
+ * {@link io.netty.buffer.ByteBuf} message = {@link io.netty.buffer.Unpooled}.wrappedBuffer(header, body);
  *
  * // Therefore, you can even create a composite by mixing a composite and an
  * // ordinary buffer.
- * {@link ByteBuf} messageWithFooter = {@link Unpooled}.wrappedBuffer(message, footer);
+ * {@link io.netty.buffer.ByteBuf} messageWithFooter = {@link io.netty.buffer.Unpooled}.wrappedBuffer(message, footer);
  *
- * // Because the composite is still a {@link ByteBuf}, you can access its content
+ * // Because the composite is still a {@link io.netty.buffer.ByteBuf}, you can access its content
  * // easily, and the accessor method will behave just like it's a single buffer
  * // even if the region you want to access spans over multiple components.  The
  * // unsigned integer being read here is located across body and footer.
@@ -100,7 +100,7 @@
  * <pre>
  * // A new dynamic buffer is created.  Internally, the actual buffer is created
  * // lazily to avoid potentially wasted memory space.
- * {@link ByteBuf} b = {@link Unpooled}.buffer(4);
+ * {@link io.netty.buffer.ByteBuf} b = {@link io.netty.buffer.Unpooled}.buffer(4);
  *
  * // When the first write attempt is made, the internal buffer is created with
  * // the specified initial capacity (4).

codec-http/src/main/java/io/netty/handler/codec/http/HttpClientCodec.java

@@ -18,7 +18,7 @@ package io.netty.handler.codec.http;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.CombinedChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAppender;
 import io.netty.handler.codec.PrematureChannelClosureException;
 
 import java.util.ArrayDeque;
@@ -40,8 +40,7 @@ import java.util.concurrent.atomic.AtomicLong;
  *
  * @see HttpServerCodec
  */
-public final class HttpClientCodec
-        extends CombinedChannelDuplexHandler<HttpResponseDecoder, HttpRequestEncoder> {
+public final class HttpClientCodec extends ChannelHandlerAppender {
 
     /** A queue that is used for correlating a request and a response. */
     private final Queue<HttpMethod> queue = new ArrayDeque<HttpMethod>();
@@ -61,14 +60,6 @@ public final class HttpClientCodec
         this(4096, 8192, 8192, false);
     }
 
-    public void setSingleDecode(boolean singleDecode) {
-        inboundHandler().setSingleDecode(singleDecode);
-    }
-
-    public boolean isSingleDecode() {
-        return inboundHandler().isSingleDecode();
-    }
-
     /**
      * Creates a new instance with the specified decoder options.
      */
@@ -90,10 +81,22 @@ public final class HttpClientCodec
     public HttpClientCodec(
             int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse,
             boolean validateHeaders) {
-        init(new Decoder(maxInitialLineLength, maxHeaderSize, maxChunkSize, validateHeaders), new Encoder());
+        add(new Decoder(maxInitialLineLength, maxHeaderSize, maxChunkSize, validateHeaders), new Encoder());
         this.failOnMissingResponse = failOnMissingResponse;
     }
 
+    private Decoder decoder() {
+        return handlerAt(0);
+    }
+
+    public void setSingleDecode(boolean singleDecode) {
+        decoder().setSingleDecode(singleDecode);
+    }
+
+    public boolean isSingleDecode() {
+        return decoder().isSingleDecode();
+    }
+
     private final class Encoder extends HttpRequestEncoder {
 
         @Override

codec-http/src/main/java/io/netty/handler/codec/http/HttpResponseEncoder.java

@@ -16,7 +16,6 @@
 package io.netty.handler.codec.http;
 
 import io.netty.buffer.ByteBuf;
-import io.netty.util.CharsetUtil;
 
 import static io.netty.handler.codec.http.HttpConstants.*;
 

codec-http/src/main/java/io/netty/handler/codec/http/HttpServerCodec.java

@@ -15,7 +15,7 @@
  */
 package io.netty.handler.codec.http;
 
-import io.netty.channel.CombinedChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAppender;
 
 
 /**
@@ -24,8 +24,7 @@ import io.netty.channel.CombinedChannelDuplexHandler;
  *
  * @see HttpClientCodec
  */
-public final class HttpServerCodec
-        extends CombinedChannelDuplexHandler<HttpRequestDecoder, HttpResponseEncoder> {
+public final class HttpServerCodec extends ChannelHandlerAppender {
 
     /**
      * Creates a new instance with the default decoder options

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientProtocolHandler.java

@@ -15,8 +15,8 @@
  */
 package io.netty.handler.codec.http.websocketx;
 
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
 import io.netty.channel.ChannelPipeline;
 import io.netty.handler.codec.http.HttpHeaders;
 
@@ -34,7 +34,7 @@ import java.util.List;
  * This implementation will establish the websocket connection once the connection to the remote server was complete.
  *
  * To know once a handshake was done you can intercept the
- * {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)} and check if the event was of type
+ * {@link ChannelHandler#userEventTriggered(ChannelHandlerContext, Object)} and check if the event was of type
  * {@link ClientHandshakeStateEvent#HANDSHAKE_ISSUED} or {@link ClientHandshakeStateEvent#HANDSHAKE_COMPLETE}.
  */
 public class WebSocketClientProtocolHandler extends WebSocketProtocolHandler {

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientProtocolHandshakeHandler.java

@@ -17,11 +17,11 @@ package io.netty.handler.codec.http.websocketx;
 
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.handler.codec.http.FullHttpResponse;
 
-class WebSocketClientProtocolHandshakeHandler extends ChannelInboundHandlerAdapter {
+class WebSocketClientProtocolHandshakeHandler extends ChannelHandlerAdapter {
     private final WebSocketClientHandshaker handshaker;
 
     public WebSocketClientProtocolHandshakeHandler(WebSocketClientHandshaker handshaker) {

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketFrameDecoder.java

@@ -15,7 +15,7 @@
  */
 package io.netty.handler.codec.http.websocketx;
 
-import io.netty.channel.ChannelInboundHandler;
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelPipeline;
 
 /**
@@ -23,5 +23,4 @@ import io.netty.channel.ChannelPipeline;
  *
  * This makes it easier to access the added encoder later in the {@link ChannelPipeline}.
  */
-public interface WebSocketFrameDecoder extends ChannelInboundHandler {
-}
+public interface WebSocketFrameDecoder extends ChannelHandler { }

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketFrameEncoder.java

@@ -15,7 +15,7 @@
  */
 package io.netty.handler.codec.http.websocketx;
 
-import io.netty.channel.ChannelOutboundHandler;
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelPipeline;
 
 /**
@@ -23,5 +23,5 @@ import io.netty.channel.ChannelPipeline;
  *
  * This makes it easier to access the added encoder later in the {@link ChannelPipeline}.
  */
-public interface WebSocketFrameEncoder extends ChannelOutboundHandler {
+public interface WebSocketFrameEncoder extends ChannelHandler {
 }

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerProtocolHandler.java

@@ -18,9 +18,8 @@ package io.netty.handler.codec.http.websocketx;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelPipeline;
 import io.netty.handler.codec.http.DefaultFullHttpResponse;
 import io.netty.handler.codec.http.FullHttpRequest;
@@ -45,7 +44,7 @@ import static io.netty.handler.codec.http.HttpVersion.*;
  * to the <tt>io.netty.example.http.websocketx.server.WebSocketServer</tt> example.
  *
  * To know once a handshake was done you can intercept the
- * {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)} and check if the event was of type
+ * {@link ChannelHandler#userEventTriggered(ChannelHandlerContext, Object)} and check if the event was of type
  * {@link ServerHandshakeStateEvent#HANDSHAKE_COMPLETE}.
  */
 public class WebSocketServerProtocolHandler extends WebSocketProtocolHandler {
@@ -122,7 +121,7 @@ public class WebSocketServerProtocolHandler extends WebSocketProtocolHandler {
     }
 
     static ChannelHandler forbiddenHttpRequestResponder() {
-        return new ChannelInboundHandlerAdapter() {
+        return new ChannelHandlerAdapter() {
             @Override
             public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                 if (msg instanceof FullHttpRequest) {

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerProtocolHandshakeHandler.java

@@ -17,8 +17,8 @@ package io.netty.handler.codec.http.websocketx;
 
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelPipeline;
 import io.netty.handler.codec.http.DefaultFullHttpResponse;
 import io.netty.handler.codec.http.FullHttpRequest;
@@ -35,8 +35,7 @@ import static io.netty.handler.codec.http.HttpVersion.*;
 /**
  * Handles the HTTP handshake (the HTTP Upgrade request) for {@link WebSocketServerProtocolHandler}.
  */
-class WebSocketServerProtocolHandshakeHandler
-        extends ChannelInboundHandlerAdapter {
+class WebSocketServerProtocolHandshakeHandler extends ChannelHandlerAdapter {
 
     private final String websocketPath;
     private final String subprotocols;

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyCodecUtil.java

@@ -16,7 +16,6 @@
 package io.netty.handler.codec.spdy;
 
 import io.netty.buffer.ByteBuf;
-import io.netty.util.CharsetUtil;
 
 final class SpdyCodecUtil {
 

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyFrameCodec.java

@@ -15,12 +15,12 @@
  */
 package io.netty.handler.codec.spdy;
 
-import io.netty.channel.CombinedChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAppender;
 
 /**
  * A combination of {@link SpdyFrameDecoder} and {@link SpdyFrameEncoder}.
  */
-public final class SpdyFrameCodec extends CombinedChannelDuplexHandler<SpdyFrameDecoder, SpdyFrameEncoder> {
+public final class SpdyFrameCodec extends ChannelHandlerAppender {
     /**
      * Creates a new instance with the specified {@code version} and
      * the default decoder and encoder options

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHttpCodec.java

@@ -15,13 +15,12 @@
  */
 package io.netty.handler.codec.spdy;
 
-import io.netty.channel.CombinedChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAppender;
 
 /**
  * A combination of {@link SpdyHttpDecoder} and {@link SpdyHttpEncoder}
  */
-public final class SpdyHttpCodec
-        extends CombinedChannelDuplexHandler<SpdyHttpDecoder, SpdyHttpEncoder> {
+public final class SpdyHttpCodec extends ChannelHandlerAppender {
     /**
      * Creates a new instance with the specified decoder options.
      */

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyOrHttpChooser.java

@@ -18,7 +18,6 @@ package io.netty.handler.codec.spdy;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
 import io.netty.channel.ChannelPipeline;
 import io.netty.handler.codec.ByteToMessageDecoder;
 import io.netty.handler.codec.http.HttpObjectAggregator;
@@ -30,7 +29,7 @@ import javax.net.ssl.SSLEngine;
 import java.util.List;
 
 /**
- * {@link ChannelInboundHandler} which is responsible to setup the {@link ChannelPipeline} either for
+ * {@link ChannelHandler} which is responsible to setup the {@link ChannelPipeline} either for
  * HTTP or SPDY. This offers an easy way for users to support both at the same time while not care to
  * much about the low-level details.
  */
@@ -125,21 +124,21 @@ public abstract class SpdyOrHttpChooser extends ByteToMessageDecoder {
     }
 
     /**
-     * Create the {@link ChannelInboundHandler} that is responsible for handling the http requests
+     * Create the {@link ChannelHandler} that is responsible for handling the http requests
      * when the {@link SelectedProtocol} was {@link SelectedProtocol#HTTP_1_0} or
      * {@link SelectedProtocol#HTTP_1_1}
      */
-    protected abstract ChannelInboundHandler createHttpRequestHandlerForHttp();
+    protected abstract ChannelHandler createHttpRequestHandlerForHttp();
 
     /**
-     * Create the {@link ChannelInboundHandler} that is responsible for handling the http responses
+     * Create the {@link ChannelHandler} that is responsible for handling the http responses
      * when the {@link SelectedProtocol} was {@link SelectedProtocol#SPDY_3} or
      * {@link SelectedProtocol#SPDY_3_1}.
      *
      * By default this getMethod will just delecate to {@link #createHttpRequestHandlerForHttp()}, but
      * sub-classes may override this to change the behaviour.
      */
-    protected ChannelInboundHandler createHttpRequestHandlerForSpdy() {
+    protected ChannelHandler createHttpRequestHandlerForSpdy() {
         return createHttpRequestHandlerForHttp();
     }
 }

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySessionHandler.java

@@ -15,22 +15,21 @@
  */
 package io.netty.handler.codec.spdy;
 
-import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.internal.EmptyArrays;
 
 import java.util.concurrent.atomic.AtomicInteger;
 
-import static io.netty.handler.codec.spdy.SpdyCodecUtil.SPDY_SESSION_STREAM_ID;
+import static io.netty.handler.codec.spdy.SpdyCodecUtil.*;
 
 /**
  * Manages streams within a SPDY session.
  */
-public class SpdySessionHandler
-        extends ChannelDuplexHandler {
+public class SpdySessionHandler extends ChannelHandlerAdapter {
 
     private static final SpdyProtocolException PROTOCOL_EXCEPTION = new SpdyProtocolException();
     private static final SpdyProtocolException STREAM_CLOSED = new SpdyProtocolException("Stream closed");

codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketServerProtocolHandlerTest.java

@@ -16,9 +16,8 @@
 package io.netty.handler.codec.http.websocketx;
 
 import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
-import io.netty.channel.ChannelOutboundHandlerAdapter;
 import io.netty.channel.ChannelPromise;
 import io.netty.channel.embedded.EmbeddedChannel;
 import io.netty.handler.codec.http.DefaultFullHttpRequest;
@@ -143,7 +142,7 @@ public class WebSocketServerProtocolHandlerTest {
         return new String(response.content().array());
     }
 
-    private class MockOutboundHandler extends ChannelOutboundHandlerAdapter {
+    private class MockOutboundHandler extends ChannelHandlerAdapter {
 
         @Override
         public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
@@ -156,7 +155,7 @@ public class WebSocketServerProtocolHandlerTest {
         }
     }
 
-    private static class CustomTextFrameHandler extends ChannelInboundHandlerAdapter {
+    private static class CustomTextFrameHandler extends ChannelHandlerAdapter {
         private String content;
 
         @Override

codec-http/src/test/java/io/netty/handler/codec/spdy/SpdyFrameDecoderTest.java

@@ -18,8 +18,8 @@ package io.netty.handler.codec.spdy;
 import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.nio.NioEventLoopGroup;
@@ -128,7 +128,7 @@ public class SpdyFrameDecoderTest {
         frame.headers().add(headerName.toString(), headerValue.toString());
     }
 
-    private static class CaptureHandler extends ChannelInboundHandlerAdapter {
+    private static class CaptureHandler extends ChannelHandlerAdapter {
         public volatile Object message;
 
         @Override

codec-http/src/test/java/io/netty/handler/codec/spdy/SpdySessionHandlerTest.java

@@ -15,8 +15,8 @@
  */
 package io.netty.handler.codec.spdy;
 
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.embedded.EmbeddedChannel;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
@@ -330,7 +330,7 @@ public class SpdySessionHandlerTest {
 
     // Echo Handler opens 4 half-closed streams on session connection
     // and then sets the number of concurrent streams to 1
-    private static class EchoHandler extends ChannelInboundHandlerAdapter {
+    private static class EchoHandler extends ChannelHandlerAdapter {
         private final int closeSignal;
         private final boolean server;
 

codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheClientCodec.java

@@ -17,7 +17,7 @@ package io.netty.handler.codec.memcache.binary;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.CombinedChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAppender;
 import io.netty.handler.codec.PrematureChannelClosureException;
 import io.netty.handler.codec.memcache.LastMemcacheContent;
 
@@ -36,7 +36,7 @@ import java.util.concurrent.atomic.AtomicLong;
  * will be passed up the pipeline and not queued up to the chunk size.
  */
 public final class BinaryMemcacheClientCodec
-    extends CombinedChannelDuplexHandler<BinaryMemcacheResponseDecoder, BinaryMemcacheRequestEncoder> {
+    extends ChannelHandlerAppender {
 
     private final boolean failOnMissingResponse;
     private final AtomicLong requestResponseCounter = new AtomicLong();
@@ -65,7 +65,7 @@ public final class BinaryMemcacheClientCodec
      */
     public BinaryMemcacheClientCodec(int decodeChunkSize, boolean failOnMissingResponse) {
         this.failOnMissingResponse = failOnMissingResponse;
-        init(new Decoder(decodeChunkSize), new Encoder());
+        add(new Decoder(decodeChunkSize), new Encoder());
     }
 
     private final class Encoder extends BinaryMemcacheRequestEncoder {
@@ -116,5 +116,4 @@ public final class BinaryMemcacheClientCodec
             }
         }
     }
-
 }

codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheServerCodec.java

@@ -15,7 +15,7 @@
  */
 package io.netty.handler.codec.memcache.binary;
 
-import io.netty.channel.CombinedChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAppender;
 
 /**
  * The full server codec that combines the correct encoder and decoder.
@@ -24,14 +24,13 @@ import io.netty.channel.CombinedChannelDuplexHandler;
  * Internally, it combines the {@link BinaryMemcacheRequestDecoder} and the
  * {@link BinaryMemcacheResponseEncoder} to request decoding and response encoding.
  */
-public class BinaryMemcacheServerCodec
-    extends CombinedChannelDuplexHandler<BinaryMemcacheRequestDecoder, BinaryMemcacheResponseEncoder> {
+public class BinaryMemcacheServerCodec extends ChannelHandlerAppender {
 
     public BinaryMemcacheServerCodec() {
         this(BinaryMemcacheDecoder.DEFAULT_MAX_CHUNK_SIZE);
     }
 
     public BinaryMemcacheServerCodec(int decodeChunkSize) {
-        init(new BinaryMemcacheRequestDecoder(decodeChunkSize), new BinaryMemcacheResponseEncoder());
+        add(new BinaryMemcacheRequestDecoder(decodeChunkSize), new BinaryMemcacheResponseEncoder());
     }
 }

codec/src/main/java/io/netty/handler/codec/ByteToMessageCodec.java

@@ -16,7 +16,7 @@
 package io.netty.handler.codec;
 
 import io.netty.buffer.ByteBuf;
-import io.netty.channel.ChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.internal.TypeParameterMatcher;
@@ -31,7 +31,7 @@ import java.util.List;
  * Be aware that sub-classes of {@link ByteToMessageCodec} <strong>MUST NOT</strong>
  * annotated with {@link @Sharable}.
  */
-public abstract class ByteToMessageCodec<I> extends ChannelDuplexHandler {
+public abstract class ByteToMessageCodec<I> extends ChannelHandlerAdapter {
 
     private final TypeParameterMatcher outboundMsgMatcher;
     private final MessageToByteEncoder<I> encoder;

codec/src/main/java/io/netty/handler/codec/ByteToMessageDecoder.java

@@ -17,15 +17,16 @@ package io.netty.handler.codec;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.util.internal.RecyclableArrayList;
 import io.netty.util.internal.StringUtil;
 
 import java.util.List;
 
 /**
- * {@link ChannelInboundHandlerAdapter} which decodes bytes in a stream-like fashion from one {@link ByteBuf} to an
+ * A {@link ChannelHandler} which decodes bytes in a stream-like fashion from one {@link ByteBuf} to an
  * other Message type.
  *
  * For example here is an implementation which reads all readable bytes from
@@ -44,7 +45,7 @@ import java.util.List;
  * Be aware that sub-classes of {@link ByteToMessageDecoder} <strong>MUST NOT</strong>
  * annotated with {@link @Sharable}.
  */
-public abstract class ByteToMessageDecoder extends ChannelInboundHandlerAdapter {
+public abstract class ByteToMessageDecoder extends ChannelHandlerAdapter {
 
     ByteBuf cumulation;
     private boolean singleDecode;

codec/src/main/java/io/netty/handler/codec/MessageToByteEncoder.java

@@ -17,9 +17,9 @@ package io.netty.handler.codec;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelOutboundHandler;
-import io.netty.channel.ChannelOutboundHandlerAdapter;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.ReferenceCountUtil;
@@ -27,7 +27,7 @@ import io.netty.util.internal.TypeParameterMatcher;
 
 
 /**
- * {@link ChannelOutboundHandlerAdapter} which encodes message in a stream-like fashion from one message to an
+ * {@link ChannelHandlerAdapter} which encodes message in a stream-like fashion from one message to an
  * {@link ByteBuf}.
  *
  *
@@ -43,7 +43,7 @@ import io.netty.util.internal.TypeParameterMatcher;
  *     }
  * </pre>
  */
-public abstract class MessageToByteEncoder<I> extends ChannelOutboundHandlerAdapter {
+public abstract class MessageToByteEncoder<I> extends ChannelHandlerAdapter {
 
     private final TypeParameterMatcher matcher;
     private final boolean preferDirect;
@@ -89,7 +89,7 @@ public abstract class MessageToByteEncoder<I> extends ChannelOutboundHandlerAdap
 
     /**
      * Returns {@code true} if the given message should be handled. If {@code false} it will be passed to the next
-     * {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
+     * {@link ChannelHandler} in the {@link ChannelPipeline}.
      */
     public boolean acceptOutboundMessage(Object msg) throws Exception {
         return matcher.match(msg);

codec/src/main/java/io/netty/handler/codec/MessageToMessageCodec.java

@@ -15,7 +15,7 @@
  */
 package io.netty.handler.codec;
 
-import io.netty.channel.ChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.ReferenceCounted;
@@ -52,7 +52,7 @@ import java.util.List;
  * are of type {@link ReferenceCounted}. This is needed as the {@link MessageToMessageCodec} will call
  * {@link ReferenceCounted#release()} on encoded / decoded messages.
  */
-public abstract class MessageToMessageCodec<INBOUND_IN, OUTBOUND_IN> extends ChannelDuplexHandler {
+public abstract class MessageToMessageCodec<INBOUND_IN, OUTBOUND_IN> extends ChannelHandlerAdapter {
 
     private final MessageToMessageEncoder<Object> encoder = new MessageToMessageEncoder<Object>() {
 

codec/src/main/java/io/netty/handler/codec/MessageToMessageDecoder.java

@@ -15,9 +15,9 @@
  */
 package io.netty.handler.codec;
 
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelPipeline;
 import io.netty.util.ReferenceCountUtil;
 import io.netty.util.ReferenceCounted;
@@ -27,7 +27,7 @@ import io.netty.util.internal.TypeParameterMatcher;
 import java.util.List;
 
 /**
- * {@link ChannelInboundHandlerAdapter} which decodes from one message to an other message.
+ * A {@link ChannelHandler} which decodes from one message to an other message.
  *
  *
  * For example here is an implementation which decodes a {@link String} to an {@link Integer} which represent
@@ -50,7 +50,7 @@ import java.util.List;
  * {@link ReferenceCounted#release()} on decoded messages.
  *
  */
-public abstract class MessageToMessageDecoder<I> extends ChannelInboundHandlerAdapter {
+public abstract class MessageToMessageDecoder<I> extends ChannelHandlerAdapter {
 
     private final TypeParameterMatcher matcher;
 
@@ -72,7 +72,7 @@ public abstract class MessageToMessageDecoder<I> extends ChannelInboundHandlerAd
 
     /**
      * Returns {@code true} if the given message should be handled. If {@code false} it will be passed to the next
-     * {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
+     * {@link ChannelHandler} in the {@link ChannelPipeline}.
      */
     public boolean acceptInboundMessage(Object msg) throws Exception {
         return matcher.match(msg);

codec/src/main/java/io/netty/handler/codec/MessageToMessageEncoder.java

@@ -15,9 +15,9 @@
  */
 package io.netty.handler.codec;
 
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelOutboundHandler;
-import io.netty.channel.ChannelOutboundHandlerAdapter;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.ReferenceCountUtil;
@@ -29,7 +29,7 @@ import io.netty.util.internal.TypeParameterMatcher;
 import java.util.List;
 
 /**
- * {@link ChannelOutboundHandlerAdapter} which encodes from one message to an other message
+ * A {@link ChannelHandler} which encodes from one message to an other message
  *
  * For example here is an implementation which decodes an {@link Integer} to an {@link String}.
  *
@@ -49,7 +49,7 @@ import java.util.List;
  * are of type {@link ReferenceCounted}. This is needed as the {@link MessageToMessageEncoder} will call
  * {@link ReferenceCounted#release()} on encoded messages.
  */
-public abstract class MessageToMessageEncoder<I> extends ChannelOutboundHandlerAdapter {
+public abstract class MessageToMessageEncoder<I> extends ChannelHandlerAdapter {
 
     private final TypeParameterMatcher matcher;
 
@@ -71,7 +71,7 @@ public abstract class MessageToMessageEncoder<I> extends ChannelOutboundHandlerA
 
     /**
      * Returns {@code true} if the given message should be handled. If {@code false} it will be passed to the next
-     * {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
+     * {@link ChannelHandler} in the {@link ChannelPipeline}.
      */
     public boolean acceptOutboundMessage(Object msg) throws Exception {
         return matcher.match(msg);

codec/src/main/java/io/netty/handler/codec/compression/JdkZlibDecoder.java

@@ -18,7 +18,6 @@ package io.netty.handler.codec.compression;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 
-import java.nio.ByteOrder;
 import java.util.List;
 import java.util.zip.CRC32;
 import java.util.zip.DataFormatException;

codec/src/test/java/io/netty/handler/codec/ReplayingDecoderTest.java

@@ -17,8 +17,8 @@ package io.netty.handler.codec;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.embedded.EmbeddedChannel;
 import org.junit.Test;
 
@@ -79,7 +79,7 @@ public class ReplayingDecoderTest {
         assertNull(ch.readInbound());
     }
 
-    private static final class BloatedLineDecoder extends ChannelInboundHandlerAdapter {
+    private static final class BloatedLineDecoder extends ChannelHandlerAdapter {
         @Override
         public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
             ctx.pipeline().replace(this, "less-bloated", new LineDecoder());

codec/src/test/java/io/netty/handler/codec/bytes/ByteArrayEncoderTest.java

@@ -26,7 +26,6 @@ import java.util.Random;
 
 import static io.netty.buffer.Unpooled.*;
 import static org.hamcrest.core.Is.*;
-import static org.hamcrest.core.IsNull.*;
 import static org.junit.Assert.*;
 
 @SuppressWarnings("ZeroLengthArrayAllocation")

example/src/main/java/io/netty/example/echo/EchoClientHandler.java

@@ -17,8 +17,8 @@ package io.netty.example.echo;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -28,7 +28,7 @@ import java.util.logging.Logger;
  * traffic between the echo client and server by sending the first message to
  * the server.
  */
-public class EchoClientHandler extends ChannelInboundHandlerAdapter {
+public class EchoClientHandler extends ChannelHandlerAdapter {
 
     private static final Logger logger = Logger.getLogger(
             EchoClientHandler.class.getName());

example/src/main/java/io/netty/example/echo/EchoServerHandler.java

@@ -16,8 +16,8 @@
 package io.netty.example.echo;
 
 import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -26,7 +26,7 @@ import java.util.logging.Logger;
  * Handler implementation for the echo server.
  */
 @Sharable
-public class EchoServerHandler extends ChannelInboundHandlerAdapter {
+public class EchoServerHandler extends ChannelHandlerAdapter {
 
     private static final Logger logger = Logger.getLogger(
             EchoServerHandler.class.getName());

example/src/main/java/io/netty/example/http/helloworld/HttpHelloWorldServerHandler.java

@@ -17,8 +17,8 @@ package io.netty.example.http.helloworld;
 
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.handler.codec.http.DefaultFullHttpResponse;
 import io.netty.handler.codec.http.FullHttpResponse;
 import io.netty.handler.codec.http.HttpRequest;
@@ -28,7 +28,7 @@ import static io.netty.handler.codec.http.HttpHeaders.*;
 import static io.netty.handler.codec.http.HttpResponseStatus.*;
 import static io.netty.handler.codec.http.HttpVersion.*;
 
-public class HttpHelloWorldServerHandler extends ChannelInboundHandlerAdapter {
+public class HttpHelloWorldServerHandler extends ChannelHandlerAdapter {
     private static final byte[] CONTENT = { 'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd' };
 
     @Override

example/src/main/java/io/netty/example/localecho/LocalEchoServerHandler.java

@@ -15,11 +15,11 @@
  */
 package io.netty.example.localecho;
 
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 
 
-public class LocalEchoServerHandler extends ChannelInboundHandlerAdapter {
+public class LocalEchoServerHandler extends ChannelHandlerAdapter {
 
     @Override
     public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

example/src/main/java/io/netty/example/objectecho/ObjectEchoClientHandler.java

@@ -15,8 +15,8 @@
  */
 package io.netty.example.objectecho;
 
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -28,7 +28,7 @@ import java.util.logging.Logger;
  * ping-pong traffic between the object echo client and server by sending the
  * first message to the server.
  */
-public class ObjectEchoClientHandler extends ChannelInboundHandlerAdapter {
+public class ObjectEchoClientHandler extends ChannelHandlerAdapter {
 
     private static final Logger logger = Logger.getLogger(
             ObjectEchoClientHandler.class.getName());

example/src/main/java/io/netty/example/objectecho/ObjectEchoServerHandler.java

@@ -15,8 +15,8 @@
  */
 package io.netty.example.objectecho;
 
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -25,7 +25,7 @@ import java.util.logging.Logger;
  * Handles both client-side and server-side handler depending on which
  * constructor was called.
  */
-public class ObjectEchoServerHandler extends ChannelInboundHandlerAdapter {
+public class ObjectEchoServerHandler extends ChannelHandlerAdapter {
 
     private static final Logger logger = Logger.getLogger(
             ObjectEchoServerHandler.class.getName());

example/src/main/java/io/netty/example/proxy/HexDumpProxyBackendHandler.java

@@ -19,10 +19,10 @@ import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 
-public class HexDumpProxyBackendHandler extends ChannelInboundHandlerAdapter {
+public class HexDumpProxyBackendHandler extends ChannelHandlerAdapter {
 
     private final Channel inboundChannel;
 

example/src/main/java/io/netty/example/proxy/HexDumpProxyFrontendHandler.java

@@ -20,11 +20,11 @@ import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelOption;
 
-public class HexDumpProxyFrontendHandler extends ChannelInboundHandlerAdapter {
+public class HexDumpProxyFrontendHandler extends ChannelHandlerAdapter {
 
     private final String remoteHost;
     private final int remotePort;

example/src/main/java/io/netty/example/sctp/SctpEchoClientHandler.java

@@ -17,8 +17,8 @@ package io.netty.example.sctp;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.sctp.SctpMessage;
 
 import java.util.logging.Level;
@@ -29,7 +29,7 @@ import java.util.logging.Logger;
  * traffic between the echo client and server by sending the first message to
  * the server.
  */
-public class SctpEchoClientHandler extends ChannelInboundHandlerAdapter {
+public class SctpEchoClientHandler extends ChannelHandlerAdapter {
 
     private static final Logger logger = Logger.getLogger(
             SctpEchoClientHandler.class.getName());

example/src/main/java/io/netty/example/sctp/SctpEchoServerHandler.java

@@ -16,8 +16,8 @@
 package io.netty.example.sctp;
 
 import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -26,7 +26,7 @@ import java.util.logging.Logger;
  * Handler implementation for the SCTP echo server.
  */
 @Sharable
-public class SctpEchoServerHandler extends ChannelInboundHandlerAdapter {
+public class SctpEchoServerHandler extends ChannelHandlerAdapter {
 
     private static final Logger logger = Logger.getLogger(
             SctpEchoServerHandler.class.getName());

example/src/main/java/io/netty/example/socksproxy/DirectClientHandler.java

@@ -15,12 +15,12 @@
  */
 package io.netty.example.socksproxy;
 
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.util.concurrent.Promise;
 
 
-public final class DirectClientHandler extends ChannelInboundHandlerAdapter {
+public final class DirectClientHandler extends ChannelHandlerAdapter {
     private static final String name = "DIRECT_CLIENT_HANDLER";
 
     public static String getName() {

example/src/main/java/io/netty/example/socksproxy/RelayHandler.java

@@ -17,12 +17,12 @@ package io.netty.example.socksproxy;
 
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.util.ReferenceCountUtil;
 
 
-public final class RelayHandler extends ChannelInboundHandlerAdapter {
+public final class RelayHandler extends ChannelHandlerAdapter {
     private static final String name = "RELAY_HANDLER";
 
     public static String getName() {

example/src/main/java/io/netty/example/udt/echo/bytes/ByteEchoServerHandler.java

@@ -16,8 +16,8 @@
 package io.netty.example.udt.echo.bytes;
 
 import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.udt.nio.NioUdtProvider;
 
 import java.util.logging.Level;
@@ -27,7 +27,7 @@ import java.util.logging.Logger;
  * Handler implementation for the echo server.
  */
 @Sharable
-public class ByteEchoServerHandler extends ChannelInboundHandlerAdapter {
+public class ByteEchoServerHandler extends ChannelHandlerAdapter {
 
     private static final Logger log = Logger.getLogger(ByteEchoServerHandler.class.getName());
 

example/src/main/java/io/netty/example/udt/echo/message/MsgEchoServerHandler.java

@@ -16,8 +16,8 @@
 package io.netty.example.udt.echo.message;
 
 import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.udt.nio.NioUdtProvider;
 
 import java.util.logging.Level;
@@ -27,7 +27,7 @@ import java.util.logging.Logger;
  * Handler implementation for the echo server.
  */
 @Sharable
-public class MsgEchoServerHandler extends ChannelInboundHandlerAdapter {
+public class MsgEchoServerHandler extends ChannelHandlerAdapter {
 
     private static final Logger log = Logger.getLogger(MsgEchoServerHandler.class.getName());
 

handler/src/main/java/io/netty/handler/logging/LoggingHandler.java

@@ -17,9 +17,9 @@ package io.netty.handler.logging;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufHolder;
-import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.internal.logging.InternalLogLevel;
@@ -33,7 +33,7 @@ import java.net.SocketAddress;
  * By default, all events are logged at <tt>DEBUG</tt> level.
  */
 @Sharable
-public class LoggingHandler extends ChannelDuplexHandler {
+public class LoggingHandler extends ChannelHandlerAdapter {
 
     private static final LogLevel DEFAULT_LEVEL = LogLevel.DEBUG;
 

handler/src/main/java/io/netty/handler/logging/package-info.java

@@ -15,6 +15,6 @@
  */
 
 /**
- * Logs a {@link io.netty.channel.ChannelEvent} for debugging purpose.
+ * Logs the I/O events for debugging purpose.
  */
 package io.netty.handler.logging;

handler/src/main/java/io/netty/handler/ssl/SslHandler.java

@@ -22,9 +22,8 @@ import io.netty.channel.Channel;
 import io.netty.channel.ChannelException;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
-import io.netty.channel.ChannelOutboundHandler;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.ChannelPromise;
 import io.netty.handler.codec.ByteToMessageDecoder;
@@ -75,7 +74,7 @@ import java.util.regex.Pattern;
  * <p>
  * Beside using the handshake {@link ChannelFuture} to get notified about the completation of the handshake it's
  * also possible to detect it by implement the
- * {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)}
+ * {@link ChannelHandler#userEventTriggered(ChannelHandlerContext, Object)}
  * method and check for a {@link SslHandshakeCompletionEvent}.
  *
  * <h3>Handshake</h3>
@@ -155,7 +154,7 @@ import java.util.regex.Pattern;
  * For more details see
  * <a href="https://github.com/netty/netty/issues/832">#832</a> in our issue tracker.
  */
-public class SslHandler extends ByteToMessageDecoder implements ChannelOutboundHandler {
+public class SslHandler extends ByteToMessageDecoder {
 
     private static final InternalLogger logger =
             InternalLoggerFactory.getInstance(SslHandler.class);

handler/src/main/java/io/netty/handler/stream/ChunkedWriteHandler.java

@@ -19,10 +19,10 @@ import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufHolder;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
-import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.ChannelProgressivePromise;
@@ -66,8 +66,7 @@ import java.util.Queue;
  * transfer.  To resume the transfer when a new chunk is available, you have to
  * call {@link #resumeTransfer()}.
  */
-public class ChunkedWriteHandler
-        extends ChannelDuplexHandler {
+public class ChunkedWriteHandler extends ChannelHandlerAdapter {
 
     private static final InternalLogger logger =
         InternalLoggerFactory.getInstance(ChunkedWriteHandler.class);

handler/src/main/java/io/netty/handler/timeout/IdleStateHandler.java

@@ -17,9 +17,9 @@ package io.netty.handler.timeout;
 
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.Channel;
-import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelPromise;
@@ -71,7 +71,7 @@ import java.util.concurrent.TimeUnit;
  * }
  *
  * // Handler should handle the {@link IdleStateEvent} triggered by {@link IdleStateHandler}.
- * public class MyHandler extends {@link ChannelDuplexHandler} {
+ * public class MyHandler extends {@link ChannelHandlerAdapter} {
  *     {@code @Override}
  *     public void userEventTriggered({@link ChannelHandlerContext} ctx, {@link Object} evt) throws {@link Exception} {
  *         if (evt instanceof {@link IdleStateEvent}} {
@@ -94,7 +94,7 @@ import java.util.concurrent.TimeUnit;
  * @see ReadTimeoutHandler
  * @see WriteTimeoutHandler
  */
-public class IdleStateHandler extends ChannelDuplexHandler {
+public class IdleStateHandler extends ChannelHandlerAdapter {
 
     private final long readerIdleTimeMillis;
     private final long writerIdleTimeMillis;

handler/src/main/java/io/netty/handler/timeout/ReadTimeoutHandler.java

@@ -17,9 +17,8 @@ package io.netty.handler.timeout;
 
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.Channel;
-import io.netty.channel.ChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelInitializer;
 
 import java.util.concurrent.ScheduledFuture;
@@ -41,7 +40,7 @@ import java.util.concurrent.TimeUnit;
  * }
  *
  * // Handler should handle the {@link ReadTimeoutException}.
- * public class MyHandler extends {@link ChannelDuplexHandler} {
+ * public class MyHandler extends {@link ChannelHandlerAdapter} {
  *     {@code @Override}
  *     public void exceptionCaught({@link ChannelHandlerContext} ctx, {@link Throwable} cause)
  *             throws {@link Exception} {
@@ -61,7 +60,7 @@ import java.util.concurrent.TimeUnit;
  * @see WriteTimeoutHandler
  * @see IdleStateHandler
  */
-public class ReadTimeoutHandler extends ChannelInboundHandlerAdapter {
+public class ReadTimeoutHandler extends ChannelHandlerAdapter {
 
     private final long timeoutMillis;
 

handler/src/main/java/io/netty/handler/timeout/WriteTimeoutHandler.java

@@ -17,12 +17,11 @@ package io.netty.handler.timeout;
 
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.Channel;
-import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInitializer;
-import io.netty.channel.ChannelOutboundHandlerAdapter;
 import io.netty.channel.ChannelPromise;
 
 import java.util.concurrent.ScheduledFuture;
@@ -44,7 +43,7 @@ import java.util.concurrent.TimeUnit;
  * }
  *
  * // Handler should handle the {@link WriteTimeoutException}.
- * public class MyHandler extends {@link ChannelDuplexHandler} {
+ * public class MyHandler extends {@link ChannelHandlerAdapter} {
  *     {@code @Override}
  *     public void exceptionCaught({@link ChannelHandlerContext} ctx, {@link Throwable} cause)
  *             throws {@link Exception} {
@@ -64,7 +63,7 @@ import java.util.concurrent.TimeUnit;
  * @see ReadTimeoutHandler
  * @see IdleStateHandler
  */
-public class WriteTimeoutHandler extends ChannelOutboundHandlerAdapter {
+public class WriteTimeoutHandler extends ChannelHandlerAdapter {
 
     private final long timeoutMillis;
 

handler/src/main/java/io/netty/handler/traffic/AbstractTrafficShapingHandler.java

@@ -17,7 +17,7 @@ package io.netty.handler.traffic;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufHolder;
-import io.netty.channel.ChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
 import io.netty.util.Attribute;
@@ -42,7 +42,7 @@ import java.util.concurrent.TimeUnit;
  * or start the monitoring, to change the checkInterval directly, or to have access to its values.</li>
  * </ul>
  */
-public abstract class AbstractTrafficShapingHandler extends ChannelDuplexHandler {
+public abstract class AbstractTrafficShapingHandler extends ChannelHandlerAdapter {
     /**
      * Default delay between two checks: 1s
      */

handler/src/main/java/io/netty/handler/traffic/package-info.java

@@ -23,20 +23,21 @@
  *
  * <p>Two classes implement this behavior:
  * <ul>
- * <li> <tt>{@link TrafficCounter}</tt>: this class implements the counters needed by the handlers.
- * It can be accessed to get some extra information like the read or write bytes since last check, the read and write
- * bandwidth from last check...</li>
+ * <li> <tt>{@link io.netty.handler.traffic.TrafficCounter}</tt>: this class implements the counters needed by the
+ * handlers.  It can be accessed to get some extra information like the read or write bytes since last check,
+ * the read and write bandwidth from last check...</li>
  *
- * <li> <tt>{@link AbstractTrafficShapingHandler}</tt>: this abstract class implements the kernel
- * of traffic shaping. It could be extended to fit your needs. Two classes are proposed as default
- * implementations: see {@link ChannelTrafficShapingHandler} and see {@link GlobalTrafficShapingHandler}
- * respectively for Channel traffic shaping and Global traffic shaping.</li>
+ * <li> <tt>{@link io.netty.handler.traffic.AbstractTrafficShapingHandler}</tt>: this abstract class implements
+ * the kernel of traffic shaping. It could be extended to fit your needs. Two classes are proposed as default
+ * implementations: see {@link io.netty.handler.traffic.ChannelTrafficShapingHandler} and
+ * {@link io.netty.handler.traffic.GlobalTrafficShapingHandler} respectively for per-channel traffic shaping and
+ * global traffic shaping.</li>
  * </ul></p>
  *
  * <p>Both inbound and outbound traffic can be shaped independently.  This is done by either passing in
  * the desired limiting values to the constructors of both the Channel and Global traffic shaping handlers,
- * or by calling the <tt>configure</tt> method on the {@link AbstractTrafficShapingHandler}.  A value of
- * 0 for either parameter indicates that there should be no limitation.  This allows you to monitor the
+ * or by calling the <tt>configure</tt> method on the {@link io.netty.handler.traffic.AbstractTrafficShapingHandler}.
+ * A value of  for either parameter indicates that there should be no limitation.  This allows you to monitor the
  * incoming and outgoing traffic without shaping.</p>
  *
  * <p>To activate or deactivate the statistics, you can adjust the delay to a low (suggested not less than 200ms
@@ -44,11 +45,13 @@
  * or even using <tt>0</tt> which means no computation will be done.</p>
  *
  * <p>If you want to do anything with these statistics, just override the <tt>doAccounting</tt> method.<br>
- * This interval can be changed either from the method <tt>configure</tt> in {@link AbstractTrafficShapingHandler}
- * or directly using the method <tt>configure</tt> of {@link TrafficCounter}.</p>
+ * This interval can be changed either from the method <tt>configure</tt>
+ * in {@link io.netty.handler.traffic.AbstractTrafficShapingHandler} or directly using the method <tt>configure</tt>
+ * of {@link io.netty.handler.traffic.TrafficCounter}.</p>
  *
- * <p>Note that a new {@link ChannelTrafficShapingHandler} must be created for each new channel,
- * but only one {@link GlobalTrafficShapingHandler} must be created for all channels.</p>
+ * <p>Note that a new {@link io.netty.handler.traffic.ChannelTrafficShapingHandler} must be created
+ * for each new channel, but only one {@link io.netty.handler.traffic.GlobalTrafficShapingHandler} must be created
+ * for all channels.</p>
  *
  * <p>Note also that you can create different GlobalTrafficShapingHandler if you want to separate classes of
  * channels (for instance either from business point of view or from bind address point of view).</p>

handler/src/test/java/io/netty/handler/logging/LoggingHandlerTest.java

@@ -18,12 +18,9 @@ package io.netty.handler.logging;
 import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.spi.ILoggingEvent;
 import ch.qos.logback.core.Appender;
-import io.netty.buffer.ByteBuf;
-import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelMetadata;
 import io.netty.channel.embedded.EmbeddedChannel;
-import io.netty.util.CharsetUtil;
 import org.easymock.EasyMock;
 import org.easymock.IArgumentMatcher;
 import org.junit.Before;
@@ -31,7 +28,6 @@ import org.junit.Test;
 import org.slf4j.LoggerFactory;
 
 import java.net.InetSocketAddress;
-import java.util.regex.Pattern;
 
 import static org.easymock.EasyMock.*;
 import static org.junit.Assert.assertEquals;

testsuite/src/test/java/io/netty/testsuite/transport/socket/ServerSocketSuspendTest.java

@@ -18,8 +18,8 @@ package io.netty.testsuite.transport.socket;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelOption;
 import org.junit.Ignore;
 import org.junit.Test;
@@ -93,7 +93,7 @@ public class ServerSocketSuspendTest extends AbstractServerSocketTest {
     }
 
     @ChannelHandler.Sharable
-    private static final class AcceptedChannelCounter extends ChannelInboundHandlerAdapter {
+    private static final class AcceptedChannelCounter extends ChannelHandlerAdapter {
 
         final CountDownLatch latch;
 

testsuite/src/test/java/io/netty/testsuite/transport/socket/SocketConnectionAttemptTest.java

@@ -17,8 +17,8 @@ package io.netty.testsuite.transport.socket;
 
 import io.netty.bootstrap.Bootstrap;
 import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelOption;
 import io.netty.util.internal.SystemPropertyUtil;
 import io.netty.util.internal.logging.InternalLoggerFactory;
@@ -101,7 +101,7 @@ public class SocketConnectionAttemptTest extends AbstractClientSocketTest {
         }
     }
 
-    private static class TestHandler extends ChannelInboundHandlerAdapter {
+    private static class TestHandler extends ChannelHandlerAdapter {
         @Override
         public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
             cause.printStackTrace();

testsuite/src/test/java/io/netty/testsuite/transport/socket/SocketEchoTest.java

@@ -20,8 +20,8 @@ import io.netty.bootstrap.ServerBootstrap;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.DefaultEventLoopGroup;
 import io.netty.channel.EventLoopGroup;
@@ -116,7 +116,7 @@ public class SocketEchoTest extends AbstractSocketTest {
             });
         } else {
             sb.childHandler(sh);
-            sb.handler(new ChannelInboundHandlerAdapter() {
+            sb.handler(new ChannelHandlerAdapter() {
                 @Override
                 public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                     cause.printStackTrace();

testsuite/src/test/java/io/netty/testsuite/transport/socket/SocketFileRegionTest.java

@@ -19,8 +19,8 @@ import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
 import io.netty.channel.DefaultFileRegion;
 import io.netty.channel.FileRegion;
 import io.netty.channel.SimpleChannelInboundHandler;
@@ -70,7 +70,7 @@ public class SocketFileRegionTest extends AbstractSocketTest {
         out.write(data);
         out.close();
 
-        ChannelInboundHandler ch = new SimpleChannelInboundHandler<Object>() {
+        ChannelHandler ch = new SimpleChannelInboundHandler<Object>() {
             @Override
             public void messageReceived(ChannelHandlerContext ctx, Object msg) throws Exception {
             }

testsuite/src/test/java/io/netty/testsuite/transport/socket/SocketObjectEchoTest.java

@@ -18,8 +18,8 @@ package io.netty.testsuite.transport.socket;
 import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.handler.codec.serialization.ClassResolvers;
@@ -133,7 +133,7 @@ public class SocketObjectEchoTest extends AbstractSocketTest {
         }
     }
 
-    private static class EchoHandler extends ChannelInboundHandlerAdapter {
+    private static class EchoHandler extends ChannelHandlerAdapter {
         volatile Channel channel;
         final AtomicReference<Throwable> exception = new AtomicReference<Throwable>();
         volatile int counter;

testsuite/src/test/java/io/netty/testsuite/transport/socket/SocketSpdyEchoTest.java

@@ -20,8 +20,8 @@ import io.netty.bootstrap.ServerBootstrap;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.SimpleChannelInboundHandler;
 import io.netty.channel.socket.SocketChannel;
@@ -220,7 +220,7 @@ public class SocketSpdyEchoTest extends AbstractSocketTest {
         }
     }
 
-    private static class SpdyEchoTestServerHandler extends ChannelInboundHandlerAdapter {
+    private static class SpdyEchoTestServerHandler extends ChannelHandlerAdapter {
         final AtomicReference<Throwable> exception = new AtomicReference<Throwable>();
 
         @Override

testsuite/src/test/java/io/netty/testsuite/transport/socket/WriteBeforeRegisteredTest.java

@@ -17,8 +17,8 @@ package io.netty.testsuite.transport.socket;
 
 import io.netty.bootstrap.Bootstrap;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.socket.SocketChannel;
 import org.junit.Test;
 
@@ -42,8 +42,7 @@ public class WriteBeforeRegisteredTest extends AbstractClientSocketTest {
         }
     }
 
-    private static class TestHandler extends ChannelInboundHandlerAdapter {
-
+    private static class TestHandler extends ChannelHandlerAdapter {
         @Override
         public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
             cause.printStackTrace();

testsuite/src/test/java/io/netty/testsuite/websockets/autobahn/AutobahnServerHandler.java

@@ -19,8 +19,8 @@ import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.handler.codec.http.DefaultFullHttpResponse;
 import io.netty.handler.codec.http.FullHttpRequest;
 import io.netty.handler.codec.http.FullHttpResponse;
@@ -47,7 +47,7 @@ import static io.netty.handler.codec.http.HttpVersion.*;
 /**
  * Handles handshakes and messages
  */
-public class AutobahnServerHandler extends ChannelInboundHandlerAdapter {
+public class AutobahnServerHandler extends ChannelHandlerAdapter {
     private static final Logger logger = Logger.getLogger(AutobahnServerHandler.class.getName());
 
     private WebSocketServerHandshaker handshaker;

transport-sctp/src/main/java/io/netty/channel/sctp/SctpChannelConfig.java

@@ -18,6 +18,7 @@ package io.netty.channel.sctp;
 import com.sun.nio.sctp.SctpStandardSocketOptions.InitMaxStreams;
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.channel.ChannelConfig;
+import io.netty.channel.ChannelOption;
 import io.netty.channel.MessageSizeEstimator;
 import io.netty.channel.RecvByteBufAllocator;
 
@@ -33,12 +34,12 @@ import io.netty.channel.RecvByteBufAllocator;
  * <tr>
  * <th>Name</th><th>Associated setter method</th>
  * </tr><tr>
+ * <td>{@link ChannelOption#SO_RCVBUF}</td><td>{@link #setReceiveBufferSize(int)}</td>
+ * </tr><tr>
+ * <td>{@link ChannelOption#SO_SNDBUF}</td><td>{@link #setSendBufferSize(int)}</td>
+ * </tr><tr>
  * <td>{@link SctpChannelOption#SCTP_NODELAY}</td><td>{@link #setSctpNoDelay(boolean)}}</td>
  * </tr><tr>
- * <td>{@link SctpChannelOption#SO_RCVBUF}</td><td>{@link #setReceiveBufferSize(int)}</td>
- * </tr><tr>
- * <td>{@link SctpChannelOption#SO_SNDBUF}</td><td>{@link #setSendBufferSize(int)}</td>
- * </tr><tr>
  * <td>{@link SctpChannelOption#SCTP_INIT_MAXSTREAMS}</td><td>{@link #setInitMaxStreams(InitMaxStreams)}</td>
  * </tr>
  * </table>

transport-sctp/src/main/java/io/netty/channel/sctp/SctpServerChannelConfig.java

@@ -18,6 +18,7 @@ package io.netty.channel.sctp;
 import com.sun.nio.sctp.SctpStandardSocketOptions.InitMaxStreams;
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.channel.ChannelConfig;
+import io.netty.channel.ChannelOption;
 import io.netty.channel.MessageSizeEstimator;
 import io.netty.channel.RecvByteBufAllocator;
 
@@ -34,11 +35,11 @@ import io.netty.channel.RecvByteBufAllocator;
  * <tr>
  * <th>Name</th><th>Associated setter method</th>
  * </tr><tr>
- * <td>{@link SctpChannelOption#SO_BACKLOG}</td><td>{@link #setBacklog(int)}</td>
+ * <td>{@link ChannelOption#SO_BACKLOG}</td><td>{@link #setBacklog(int)}</td>
  * </tr><tr>
- * <td>{@link SctpChannelOption#SO_RCVBUF}</td><td>{@link #setReceiveBufferSize(int)}</td>
+ * <td>{@link ChannelOption#SO_RCVBUF}</td><td>{@link #setReceiveBufferSize(int)}</td>
  * </tr><tr>
- * <td>{@link SctpChannelOption#SO_SNDBUF}</td><td>{@link #setSendBufferSize(int)}</td>
+ * <td>{@link ChannelOption#SO_SNDBUF}</td><td>{@link #setSendBufferSize(int)}</td>
  * </tr><tr>
  * <td>{@link SctpChannelOption#SCTP_INIT_MAXSTREAMS}</td><td>{@link #setInitMaxStreams(InitMaxStreams)}</td>
  * </tr>

transport-sctp/src/main/java/io/netty/handler/codec/sctp/SctpMessageCompletionHandler.java

@@ -18,8 +18,8 @@ package io.netty.handler.codec.sctp;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
 import io.netty.channel.sctp.SctpMessage;
 import io.netty.handler.codec.MessageToMessageDecoder;
 
@@ -30,7 +30,7 @@ import java.util.Map;
 /**
  * {@link MessageToMessageDecoder} which will take care of handle fragmented {@link SctpMessage}s, so
  * only <strong>complete</strong> {@link SctpMessage}s will be forwarded to the next
- * {@link ChannelInboundHandler}.
+ * {@link ChannelHandler}.
  */
 public class SctpMessageCompletionHandler extends MessageToMessageDecoder<SctpMessage> {
     private final Map<Integer, ByteBuf> fragments = new HashMap<Integer, ByteBuf>();

transport-udt/src/test/java/io/netty/test/udt/util/EchoByteHandler.java

@@ -19,8 +19,8 @@ package io.netty.test.udt.util;
 import com.yammer.metrics.core.Meter;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.udt.nio.NioUdtProvider;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
@@ -30,7 +30,7 @@ import io.netty.util.internal.logging.InternalLoggerFactory;
  * traffic between the echo client and server by sending the first message to
  * the server on activation.
  */
-public class EchoByteHandler extends ChannelInboundHandlerAdapter {
+public class EchoByteHandler extends ChannelHandlerAdapter {
 
     private static final InternalLogger log = InternalLoggerFactory.getInstance(EchoByteHandler.class);
 

transport-udt/src/test/java/io/netty/test/udt/util/EchoMessageHandler.java

@@ -19,8 +19,8 @@ package io.netty.test.udt.util;
 import com.yammer.metrics.core.Meter;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.udt.UdtMessage;
 import io.netty.channel.udt.nio.NioUdtProvider;
 import io.netty.util.internal.logging.InternalLogger;
@@ -31,7 +31,7 @@ import io.netty.util.internal.logging.InternalLoggerFactory;
  * between the echo peers by sending the first message to the other peer on
  * activation.
  */
-public class EchoMessageHandler extends ChannelInboundHandlerAdapter {
+public class EchoMessageHandler extends ChannelHandlerAdapter {
 
     private static final InternalLogger log = InternalLoggerFactory.getInstance(EchoMessageHandler.class);
 

transport/src/main/java/io/netty/bootstrap/ServerBootstrap.java

@@ -19,8 +19,8 @@ import io.netty.channel.Channel;
 import io.netty.channel.ChannelConfig;
 import io.netty.channel.ChannelException;
 import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelOption;
 import io.netty.channel.ChannelPipeline;
@@ -254,7 +254,7 @@ public final class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, Se
         return new Entry[size];
     }
 
-    private static class ServerBootstrapAcceptor extends ChannelInboundHandlerAdapter {
+    private static class ServerBootstrapAcceptor extends ChannelHandlerAdapter {
 
         private final ChannelHandler childHandler;
         private final Entry<ChannelOption<?>, Object>[] childOptions;

transport/src/main/java/io/netty/channel/Channel.java

@@ -235,7 +235,7 @@ public interface Channel extends AttributeMap, ChannelOutboundOps, ChannelProper
         void closeForcibly();
 
         /**
-         * Schedules a read operation that fills the inbound buffer of the first {@link ChannelInboundHandler} in the
+         * Schedules a read operation that fills the inbound buffer of the first {@link ChannelHandler} in the
          * {@link ChannelPipeline}.  If there's already a pending read operation, this method does nothing.
          */
         void beginRead();

transport/src/main/java/io/netty/channel/ChannelConfig.java

@@ -120,7 +120,7 @@ public interface ChannelConfig {
 
     /**
      * Returns the maximum number of messages to read per read loop.
-     * a {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object) channelRead()} event.
+     * a {@link ChannelHandler#channelRead(ChannelHandlerContext, Object) channelRead()} event.
      * If this value is greater than 1, an event loop might attempt to read multiple times to procure multiple messages.
      */
     int getMaxMessagesPerRead();

transport/src/main/java/io/netty/channel/ChannelDuplexHandler.java

@@ -15,94 +15,8 @@
  */
 package io.netty.channel;
 
-import java.net.SocketAddress;
-
 /**
- * {@link ChannelHandler} implementation which represents a combination out of a {@link ChannelInboundHandler} and
- * the {@link ChannelOutboundHandler}.
- *
- * It is a good starting point if your {@link ChannelHandler} implementation needs to intercept operations and also
- * state updates.
+ * @deprecated Use {@link ChannelHandlerAdapter} instead.
  */
-public class ChannelDuplexHandler extends ChannelInboundHandlerAdapter implements ChannelOutboundHandler {
-
-    /**
-     * Calls {@link ChannelHandlerContext#bind(SocketAddress, ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void bind(ChannelHandlerContext ctx, SocketAddress localAddress,
-                     ChannelPromise future) throws Exception {
-        ctx.bind(localAddress, future);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#connect(SocketAddress, SocketAddress, ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress,
-                        SocketAddress localAddress, ChannelPromise future) throws Exception {
-        ctx.connect(remoteAddress, localAddress, future);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#disconnect(ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void disconnect(ChannelHandlerContext ctx, ChannelPromise future)
-            throws Exception {
-        ctx.disconnect(future);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#close(ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void close(ChannelHandlerContext ctx, ChannelPromise future) throws Exception {
-        ctx.close(future);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#read()} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void read(ChannelHandlerContext ctx) throws Exception {
-        ctx.read();
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#write(Object, ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
-        ctx.write(msg, promise);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#flush()} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void flush(ChannelHandlerContext ctx) throws Exception {
-        ctx.flush();
-    }
-}
+@Deprecated
+public class ChannelDuplexHandler extends ChannelHandlerAdapter { }

transport/src/main/java/io/netty/channel/ChannelHandler.java

@@ -24,29 +24,16 @@ import java.lang.annotation.Inherited;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
+import java.net.SocketAddress;
 
 /**
  * Handles an I/O event or intercepts an I/O operation, and forwards it to its next handler in
  * its {@link ChannelPipeline}.
  *
- * <h3>Sub-types</h3>
+ * <h3>Extend {@link ChannelHandlerAdapter} instead</h3>
  * <p>
- * {@link ChannelHandler} itself does not provide many methods, but you usually have to implement one of its subtypes:
- * <ul>
- * <li>{@link ChannelInboundHandler} to handle inbound I/O events, and</li>
- * <li>{@link ChannelOutboundHandler} to handle outbound I/O operations.</li>
- * </ul>
- * </p>
- * <p>
- * Alternatively, the following adapter classes are provided for your convenience:
- * <ul>
- * <li>{@link ChannelInboundHandlerAdapter} to handle inbound I/O events,</li>
- * <li>{@link ChannelOutboundHandlerAdapter} to handle outbound I/O operations, and</li>
- * <li>{@link ChannelHandlerAdapter} to handle both inbound and outbound events</li>
- * </ul>
- * </p>
- * <p>
- * For more information, please refer to the documentation of each subtype.
+ * Because this interface has many methods to implement, you might want to extend {@link ChannelHandlerAdapter}
+ * instead.
  * </p>
  *
  * <h3>The context object</h3>
@@ -184,6 +171,10 @@ import java.lang.annotation.Target;
  */
 public interface ChannelHandler {
 
+    ////////////////////////////////
+    // Handler life cycle methods //
+    ////////////////////////////////
+
     /**
      * Gets called after the {@link ChannelHandler} was added to the actual context and it's ready to handle events.
      */
@@ -195,11 +186,130 @@ public interface ChannelHandler {
      */
     void handlerRemoved(ChannelHandlerContext ctx) throws Exception;
 
+    ///////////////////////////////////
+    // Inbound event handler methods //
+    ///////////////////////////////////
+
     /**
      * Gets called if a {@link Throwable} was thrown.
      */
     void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception;
 
+    /**
+     * The {@link Channel} of the {@link ChannelHandlerContext} was registered with its {@link EventLoop}
+     */
+    void channelRegistered(ChannelHandlerContext ctx) throws Exception;
+
+    /**
+     * The {@link Channel} of the {@link ChannelHandlerContext} is now active
+     */
+    void channelActive(ChannelHandlerContext ctx) throws Exception;
+
+    /**
+     * The {@link Channel} of the {@link ChannelHandlerContext} was registered is now inactive and reached its
+     * end of lifetime.
+     */
+    void channelInactive(ChannelHandlerContext ctx) throws Exception;
+
+    /**
+     * Invoked when the current {@link Channel} has read a message from the peer.
+     */
+    void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception;
+
+    /**
+     * Invoked when the last message read by the current read operation has been consumed by
+     * {@link #channelRead(ChannelHandlerContext, Object)}.  If {@link ChannelOption#AUTO_READ} is off, no further
+     * attempt to read an inbound data from the current {@link Channel} will be made until
+     * {@link ChannelHandlerContext#read()} is called.
+     */
+    void channelReadComplete(ChannelHandlerContext ctx) throws Exception;
+
+    /**
+     * Gets called if an user event was triggered.
+     */
+    void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception;
+
+    /**
+     * Gets called once the writable state of a {@link Channel} changed. You can check the state with
+     * {@link Channel#isWritable()}.
+     */
+    void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception;
+
+    ////////////////////////////////////
+    // Outbound event handler methods //
+    ////////////////////////////////////
+
+    /**
+     * Called once a bind operation is made.
+     *
+     * @param ctx           the {@link ChannelHandlerContext} for which the bind operation is made
+     * @param localAddress  the {@link java.net.SocketAddress} to which it should bound
+     * @param promise       the {@link ChannelPromise} to notify once the operation completes
+     * @throws Exception    thrown if an error accour
+     */
+    void bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) throws Exception;
+
+    /**
+     * Called once a connect operation is made.
+     *
+     * @param ctx               the {@link ChannelHandlerContext} for which the connect operation is made
+     * @param remoteAddress     the {@link SocketAddress} to which it should connect
+     * @param localAddress      the {@link SocketAddress} which is used as source on connect
+     * @param promise           the {@link ChannelPromise} to notify once the operation completes
+     * @throws Exception        thrown if an error accour
+     */
+    void connect(
+            ChannelHandlerContext ctx,
+            SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) throws Exception;
+
+    /**
+     * Called once a disconnect operation is made.
+     *
+     * @param ctx               the {@link ChannelHandlerContext} for which the disconnect operation is made
+     * @param promise           the {@link ChannelPromise} to notify once the operation completes
+     * @throws Exception        thrown if an error accour
+     */
+    void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception;
+
+    /**
+     * Called once a close operation is made.
+     *
+     * @param ctx               the {@link ChannelHandlerContext} for which the close operation is made
+     * @param promise           the {@link ChannelPromise} to notify once the operation completes
+     * @throws Exception        thrown if an error accour
+     */
+    void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception;
+
+    /**
+     * Intercepts {@link ChannelHandlerContext#read()}.
+     */
+    void read(ChannelHandlerContext ctx) throws Exception;
+
+    /**
+     * Called once a write operation is made. The write operation will write the messages through the
+     * {@link ChannelPipeline}. Those are then ready to be flushed to the actual {@link Channel} once
+     * {@link Channel#flush()} is called
+     *
+     * @param ctx               the {@link ChannelHandlerContext} for which the write operation is made
+     * @param msg               the message to write
+     * @param promise           the {@link ChannelPromise} to notify once the operation completes
+     * @throws Exception        thrown if an error accour
+     */
+    void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception;
+
+    /**
+     * Called once a flush operation is made. The flush operation will try to flush out all previous written messages
+     * that are pending.
+     *
+     * @param ctx               the {@link ChannelHandlerContext} for which the flush operation is made
+     * @throws Exception        thrown if an error accour
+     */
+    void flush(ChannelHandlerContext ctx) throws Exception;
+
+    /////////////////
+    // Annotations //
+    /////////////////
+
     /**
      * Indicates that the same instance of the annotated {@link ChannelHandler}
      * can be added to one or more {@link ChannelPipeline}s multiple times
@@ -219,4 +329,41 @@ public interface ChannelHandler {
     @interface Sharable {
         // no value
     }
+
+    /**
+     * Indicates that the annotated event handler method in {@link ChannelHandler} will not be invoked by
+     * {@link ChannelPipeline}.  This annotation is only useful when your handler method implementation
+     * only passes the event through to the next handler, like the following:
+     *
+     * <pre>
+     * {@code @Skip}
+     * {@code @Override}
+     * public void channelActive({@link ChannelHandlerContext} ctx) {
+     *     ctx.fireChannelActive(); // do nothing but passing through to the next handler
+     * }
+     * </pre>
+     *
+     * {@link #handlerAdded(ChannelHandlerContext)} and {@link #handlerRemoved(ChannelHandlerContext)} are not able to
+     * pass the event through to the next handler, so they must do nothing when annotated.
+     *
+     * <pre>
+     * {@code @Skip}
+     * {@code @Override}
+     * public void handlerAdded({@link ChannelHandlerContext} ctx) {
+     *     // do nothing
+     * }
+     * </pre>
+     *
+     * <p>
+     * Note that this annotation is not {@linkplain Inherited inherited}.  If you override a method annotated with
+     * {@link Skip}, it will not be skipped anymore.  Similarly, you can override a method not annotated with
+     * {@link Skip} and simply pass the event through to the next handler, which reverses the behavior of the
+     * supertype.
+     * </p>
+     */
+    @Target(ElementType.METHOD)
+    @Retention(RetentionPolicy.RUNTIME)
+    @interface Skip {
+        // no value
+    }
 }

transport/src/main/java/io/netty/channel/ChannelHandlerAdapter.java

@@ -16,10 +16,12 @@
 
 package io.netty.channel;
 
+import java.net.SocketAddress;
+
 /**
  * Skelton implementation of a {@link ChannelHandler}.
  */
-public abstract class ChannelHandlerAdapter implements ChannelHandler {
+public class ChannelHandlerAdapter implements ChannelHandler {
 
     // Not using volatile because it's used only for a sanity check.
     boolean added;
@@ -35,6 +37,7 @@ public abstract class ChannelHandlerAdapter implements ChannelHandler {
     /**
      * Do nothing by default, sub-classes may override this method.
      */
+    @Skip
     @Override
     public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
         // NOOP
@@ -43,6 +46,7 @@ public abstract class ChannelHandlerAdapter implements ChannelHandler {
     /**
      * Do nothing by default, sub-classes may override this method.
      */
+    @Skip
     @Override
     public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
         // NOOP
@@ -54,9 +58,179 @@ public abstract class ChannelHandlerAdapter implements ChannelHandler {
      *
      * Sub-classes may override this method to change behavior.
      */
+    @Skip
     @Override
-    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
-            throws Exception {
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
         ctx.fireExceptionCaught(cause);
     }
+
+    /**
+     * Calls {@link ChannelHandlerContext#fireChannelRegistered()} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
+        ctx.fireChannelRegistered();
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#fireChannelActive()} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void channelActive(ChannelHandlerContext ctx) throws Exception {
+        ctx.fireChannelActive();
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#fireChannelInactive()} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
+        ctx.fireChannelInactive();
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#fireChannelRead(Object)} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        ctx.fireChannelRead(msg);
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#fireChannelReadComplete()} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
+        ctx.fireChannelReadComplete();
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#fireUserEventTriggered(Object)} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
+        ctx.fireUserEventTriggered(evt);
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#fireChannelWritabilityChanged()} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
+        ctx.fireChannelWritabilityChanged();
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#bind(java.net.SocketAddress, ChannelPromise)} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) throws Exception {
+        ctx.bind(localAddress, promise);
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#connect(SocketAddress, SocketAddress, ChannelPromise)} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void connect(
+            ChannelHandlerContext ctx,
+            SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) throws Exception {
+        ctx.connect(remoteAddress, localAddress, promise);
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#disconnect(ChannelPromise)} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
+        ctx.disconnect(promise);
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#close(ChannelPromise)} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
+        ctx.close(promise);
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#read()} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void read(ChannelHandlerContext ctx) throws Exception {
+        ctx.read();
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#write(Object)} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+        ctx.write(msg, promise);
+    }
+
+    /**
+     * Calls {@link ChannelHandlerContext#flush()} to forward
+     * to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
+     *
+     * Sub-classes may override this method to change behavior.
+     */
+    @Skip
+    @Override
+    public void flush(ChannelHandlerContext ctx) throws Exception {
+        ctx.flush();
+    }
 }

transport/src/main/java/io/netty/channel/ChannelHandlerAppender.java

@@ -0,0 +1,203 @@
+/*
+ * Copyright 2012 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A {@link ChannelHandler} that appends the specified {@link ChannelHandler}s right next to itself.
+ * By default, it removes itself from the {@link ChannelPipeline} once the specified {@link ChannelHandler}s
+ * are added. Optionally, you can keep it in the {@link ChannelPipeline} by specifying a {@code boolean}
+ * parameter at construction time.
+ */
+public class ChannelHandlerAppender extends ChannelHandlerAdapter {
+
+    private static final class Entry {
+        final String name;
+        final ChannelHandler handler;
+
+        Entry(String name, ChannelHandler handler) {
+            this.name = name;
+            this.handler = handler;
+        }
+    }
+
+    private final boolean selfRemoval;
+    private final List<Entry> handlers = new ArrayList<Entry>();
+    private boolean added;
+
+    /**
+     * Creates a new uninitialized instance. A class that extends this handler must invoke
+     * {@link #add(ChannelHandler...)} before adding this handler into a {@link ChannelPipeline}.
+     */
+    protected ChannelHandlerAppender() {
+        this(true);
+    }
+
+    /**
+     * Creates a new uninitialized instance. A class that extends this handler must invoke
+     * {@link #add(ChannelHandler...)} before adding this handler into a {@link ChannelPipeline}.
+     *
+     * @param selfRemoval {@code true} to remove itself from the {@link ChannelPipeline} after appending
+     *                    the {@link ChannelHandler}s specified via {@link #add(ChannelHandler...)}.
+     */
+    protected ChannelHandlerAppender(boolean selfRemoval) {
+        this.selfRemoval = selfRemoval;
+    }
+
+    /**
+     * Creates a new instance that appends the specified {@link ChannelHandler}s right next to itself.
+     */
+    public ChannelHandlerAppender(Iterable<? extends ChannelHandler> handlers) {
+        this(true, handlers);
+    }
+
+    /**
+     * Creates a new instance that appends the specified {@link ChannelHandler}s right next to itself.
+     */
+    public ChannelHandlerAppender(ChannelHandler... handlers) {
+        this(true, handlers);
+    }
+
+    /**
+     * Creates a new instance that appends the specified {@link ChannelHandler}s right next to itself.
+     *
+     * @param selfRemoval {@code true} to remove itself from the {@link ChannelPipeline} after appending
+     *                    the specified {@link ChannelHandler}s
+     */
+    public ChannelHandlerAppender(boolean selfRemoval, Iterable<? extends ChannelHandler> handlers) {
+        this.selfRemoval = selfRemoval;
+        add(handlers);
+    }
+
+    /**
+     * Creates a new instance that appends the specified {@link ChannelHandler}s right next to itself.
+     *
+     * @param selfRemoval {@code true} to remove itself from the {@link ChannelPipeline} after appending
+     *                    the specified {@link ChannelHandler}s
+     */
+    public ChannelHandlerAppender(boolean selfRemoval, ChannelHandler... handlers) {
+        this.selfRemoval = selfRemoval;
+        add(handlers);
+    }
+
+    /**
+     * Adds the specified handler to the list of the appended handlers.
+     *
+     * @param name the name of the appended handler. {@code null} to auto-generate
+     * @param handler the handler to append
+     *
+     * @throws IllegalStateException if {@link ChannelHandlerAppender} has been added to the pipeline already
+     */
+    protected final ChannelHandlerAppender add(String name, ChannelHandler handler) {
+        if (handler == null) {
+            throw new NullPointerException("handler");
+        }
+
+        if (added) {
+            throw new IllegalStateException("added to the pipeline already");
+        }
+
+        handlers.add(new Entry(name, handler));
+        return this;
+    }
+
+    /**
+     * Adds the specified handler to the list of the appended handlers with the auto-generated handler name.
+     *
+     * @param handler the handler to append
+     *
+     * @throws IllegalStateException if {@link ChannelHandlerAppender} has been added to the pipeline already
+     */
+    protected final ChannelHandlerAppender add(ChannelHandler handler) {
+        return add(null, handler);
+    }
+
+    /**
+     * Adds the specified handlers to the list of the appended handlers. The handlers' names are auto-generated.
+     *
+     * @throws IllegalStateException if {@link ChannelHandlerAppender} has been added to the pipeline already
+     */
+    @SuppressWarnings("unchecked")
+    protected final ChannelHandlerAppender add(Iterable<? extends ChannelHandler> handlers) {
+        if (handlers == null) {
+            throw new NullPointerException("handlers");
+        }
+
+        for (ChannelHandler h: handlers) {
+            if (h == null) {
+                break;
+            }
+            add(h);
+        }
+
+        return this;
+    }
+
+    /**
+     * Adds the specified handlers to the list of the appended handlers. The handlers' names are auto-generated.
+     *
+     * @throws IllegalStateException if {@link ChannelHandlerAppender} has been added to the pipeline already
+     */
+    protected final ChannelHandlerAppender add(ChannelHandler... handlers) {
+        if (handlers == null) {
+            throw new NullPointerException("handlers");
+        }
+
+        for (ChannelHandler h: handlers) {
+            if (h == null) {
+                break;
+            }
+
+            add(h);
+        }
+
+        return this;
+    }
+
+    /**
+     * Returns the {@code index}-th appended handler.
+     */
+    @SuppressWarnings("unchecked")
+    protected final <T extends ChannelHandler> T handlerAt(int index) {
+        return (T) handlers.get(index).handler;
+    }
+
+    @Override
+    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
+        added = true;
+
+        DefaultChannelPipeline pipeline = (DefaultChannelPipeline) ctx.pipeline();
+
+        String name = ctx.name();
+        try {
+            for (Entry e: handlers) {
+                String oldName = name;
+                if (e.name == null) {
+                    name = pipeline.generateName(e.handler);
+                } else {
+                    name = e.name;
+                }
+                pipeline.addAfter(ctx.invoker(), oldName, name, e.handler);
+            }
+        } finally {
+            if (selfRemoval) {
+                pipeline.remove(this);
+            }
+        }
+    }
+}

transport/src/main/java/io/netty/channel/ChannelHandlerContext.java

@@ -44,7 +44,7 @@ import java.nio.channels.Channels;
  * You can keep the {@link ChannelHandlerContext} for later use, such as
  * triggering an event outside the handler methods, even from a different thread.
  * <pre>
- * public class MyHandler extends {@link ChannelDuplexHandler} {
+ * public class MyHandler extends {@link ChannelHandlerAdapter} {
  *
  *     <b>private {@link ChannelHandlerContext} ctx;</b>
  *
@@ -79,15 +79,14 @@ import java.nio.channels.Channels;
  * as how many times it is added to pipelines, regardless if it is added to the
  * same pipeline multiple times or added to different pipelines multiple times:
  * <pre>
- * public class FactorialHandler extends {@link ChannelInboundHandlerAdapter}&lt{@link Integer}&gt {
+ * public class FactorialHandler extends {@link ChannelHandlerAdapter} {
  *
- *   private final {@link AttributeKey}&lt{@link Integer}&gt counter =
- *           new {@link AttributeKey}&lt{@link Integer}&gt("counter");
+ *   private final {@link AttributeKey}&lt{@link Integer}&gt counter = {@link AttributeKey}.valueOf("counter");
  *
  *   // This handler will receive a sequence of increasing integers starting
  *   // from 1.
  *   {@code @Override}
- *   public void channelRead({@link ChannelHandlerContext} ctx, {@link Integer} integer) {
+ *   public void channelRead({@link ChannelHandlerContext} ctx, Object msg) {
  *     {@link Attribute}&lt{@link Integer}&gt attr = ctx.getAttr(counter);
  *     Integer a = ctx.getAttr(counter).get();
  *
@@ -95,7 +94,7 @@ import java.nio.channels.Channels;
  *       a = 1;
  *     }
  *
- *     attr.set(a * integer));
+ *     attr.set(a * (Integer) msg);
  *   }
  * }
  *
@@ -134,6 +133,14 @@ public interface ChannelHandlerContext
      */
     EventExecutor executor();
 
+    /**
+     * Returns the {@link ChannelHandlerInvoker} which is used to trigger an event for the associated
+     * {@link ChannelHandler}. Note that the methods in {@link ChannelHandlerInvoker} are not intended to be called
+     * by a user. Use this method only to obtain the reference to the {@link ChannelHandlerInvoker}
+     * (and not calling its methods) unless you know what you are doing.
+     */
+    ChannelHandlerInvoker invoker();
+
     /**
      * The unique name of the {@link ChannelHandlerContext}.The name was used when then {@link ChannelHandler}
      * was added to the {@link ChannelPipeline}. This name can also be used to access the registered

transport/src/main/java/io/netty/channel/ChannelHandlerInvoker.java

@@ -21,9 +21,9 @@ import io.netty.util.concurrent.EventExecutor;
 import java.net.SocketAddress;
 
 /**
- * Invokes the event handler methods of {@link ChannelInboundHandler} and {@link ChannelOutboundHandler}.
+ * Invokes the event handler methods of {@link ChannelHandler}.
  * A user can specify a {@link ChannelHandlerInvoker} to implement a custom thread model unsupported by the default
- * implementation.
+ * implementation. Note that the methods in this interface are not intended to be called by a user.
  */
 public interface ChannelHandlerInvoker {
 
@@ -33,21 +33,21 @@ public interface ChannelHandlerInvoker {
     EventExecutor executor();
 
     /**
-     * Invokes {@link ChannelInboundHandler#channelRegistered(ChannelHandlerContext)}. This method is not for a user
+     * Invokes {@link ChannelHandler#channelRegistered(ChannelHandlerContext)}. This method is not for a user
      * but for the internal {@link ChannelHandlerContext} implementation. To trigger an event, use the methods in
      * {@link ChannelHandlerContext} instead.
      */
     void invokeChannelRegistered(ChannelHandlerContext ctx);
 
     /**
-     * Invokes {@link ChannelInboundHandler#channelActive(ChannelHandlerContext)}. This method is not for a user
+     * Invokes {@link ChannelHandler#channelActive(ChannelHandlerContext)}. This method is not for a user
      * but for the internal {@link ChannelHandlerContext} implementation. To trigger an event, use the methods in
      * {@link ChannelHandlerContext} instead.
      */
     void invokeChannelActive(ChannelHandlerContext ctx);
 
     /**
-     * Invokes {@link ChannelInboundHandler#channelInactive(ChannelHandlerContext)}. This method is not for a user
+     * Invokes {@link ChannelHandler#channelInactive(ChannelHandlerContext)}. This method is not for a user
      * but for the internal {@link ChannelHandlerContext} implementation. To trigger an event, use the methods in
      * {@link ChannelHandlerContext} instead.
      */
@@ -61,35 +61,35 @@ public interface ChannelHandlerInvoker {
     void invokeExceptionCaught(ChannelHandlerContext ctx, Throwable cause);
 
     /**
-     * Invokes {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)}. This method is not for
+     * Invokes {@link ChannelHandler#userEventTriggered(ChannelHandlerContext, Object)}. This method is not for
      * a user but for the internal {@link ChannelHandlerContext} implementation. To trigger an event, use the methods in
      * {@link ChannelHandlerContext} instead.
      */
     void invokeUserEventTriggered(ChannelHandlerContext ctx, Object event);
 
     /**
-     * Invokes {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object)}. This method is not for a user
+     * Invokes {@link ChannelHandler#channelRead(ChannelHandlerContext, Object)}. This method is not for a user
      * but for the internal {@link ChannelHandlerContext} implementation. To trigger an event, use the methods in
      * {@link ChannelHandlerContext} instead.
      */
     void invokeChannelRead(ChannelHandlerContext ctx, Object msg);
 
     /**
-     * Invokes {@link ChannelInboundHandler#channelReadComplete(ChannelHandlerContext)}. This method is not for a user
+     * Invokes {@link ChannelHandler#channelReadComplete(ChannelHandlerContext)}. This method is not for a user
      * but for the internal {@link ChannelHandlerContext} implementation. To trigger an event, use the methods in
      * {@link ChannelHandlerContext} instead.
      */
     void invokeChannelReadComplete(ChannelHandlerContext ctx);
 
     /**
-     * Invokes {@link ChannelInboundHandler#channelWritabilityChanged(ChannelHandlerContext)}. This method is not for
+     * Invokes {@link ChannelHandler#channelWritabilityChanged(ChannelHandlerContext)}. This method is not for
      * a user but for the internal {@link ChannelHandlerContext} implementation. To trigger an event, use the methods in
      * {@link ChannelHandlerContext} instead.
      */
     void invokeChannelWritabilityChanged(ChannelHandlerContext ctx);
 
     /**
-     * Invokes {@link ChannelOutboundHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)}.
+     * Invokes {@link ChannelHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)}.
      * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
      * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
      */
@@ -97,7 +97,7 @@ public interface ChannelHandlerInvoker {
 
     /**
      * Invokes
-     * {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}.
+     * {@link ChannelHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}.
      * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
      * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
      */
@@ -105,43 +105,35 @@ public interface ChannelHandlerInvoker {
             ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise);
 
     /**
-     * Invokes {@link ChannelOutboundHandler#disconnect(ChannelHandlerContext, ChannelPromise)}.
+     * Invokes {@link ChannelHandler#disconnect(ChannelHandlerContext, ChannelPromise)}.
      * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
      * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
      */
     void invokeDisconnect(ChannelHandlerContext ctx, ChannelPromise promise);
 
     /**
-     * Invokes {@link ChannelOutboundHandler#close(ChannelHandlerContext, ChannelPromise)}.
+     * Invokes {@link ChannelHandler#close(ChannelHandlerContext, ChannelPromise)}.
      * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
      * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
      */
     void invokeClose(ChannelHandlerContext ctx, ChannelPromise promise);
 
     /**
-     * Invokes {@link ChannelOutboundHandler#read(ChannelHandlerContext)}.
+     * Invokes {@link ChannelHandler#read(ChannelHandlerContext)}.
      * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
      * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
      */
     void invokeRead(ChannelHandlerContext ctx);
 
     /**
-     * Invokes {@link ChannelOutboundHandler#write(ChannelHandlerContext, Object, ChannelPromise)}.
+     * Invokes {@link ChannelHandler#write(ChannelHandlerContext, Object, ChannelPromise)}.
      * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
      * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
      */
     void invokeWrite(ChannelHandlerContext ctx, Object msg, ChannelPromise promise);
 
     /**
-     * Invokes {@link ChannelOutboundHandler#write(ChannelHandlerContext, Object, ChannelPromise)} and
-     * {@link ChannelOutboundHandler#flush(ChannelHandlerContext)} sequentially.
-     * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
-     * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
-     */
-    void invokeWriteAndFlush(ChannelHandlerContext ctx, Object msg, ChannelPromise promise);
-
-    /**
-     * Invokes {@link ChannelOutboundHandler#flush(ChannelHandlerContext)}.
+     * Invokes {@link ChannelHandler#flush(ChannelHandlerContext)}.
      * This method is not for a user but for the internal {@link ChannelHandlerContext} implementation.
      * To trigger an event, use the methods in {@link ChannelHandlerContext} instead.
      */

transport/src/main/java/io/netty/channel/ChannelHandlerInvokerUtil.java

@@ -27,7 +27,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeChannelRegisteredNow(ChannelHandlerContext ctx) {
         try {
-            ((ChannelInboundHandler) ctx.handler()).channelRegistered(ctx);
+            ctx.handler().channelRegistered(ctx);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -35,7 +35,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeChannelActiveNow(final ChannelHandlerContext ctx) {
         try {
-            ((ChannelInboundHandler) ctx.handler()).channelActive(ctx);
+            ctx.handler().channelActive(ctx);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -43,7 +43,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeChannelInactiveNow(final ChannelHandlerContext ctx) {
         try {
-            ((ChannelInboundHandler) ctx.handler()).channelInactive(ctx);
+            ctx.handler().channelInactive(ctx);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -63,7 +63,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeUserEventTriggeredNow(final ChannelHandlerContext ctx, final Object event) {
         try {
-            ((ChannelInboundHandler) ctx.handler()).userEventTriggered(ctx, event);
+            ctx.handler().userEventTriggered(ctx, event);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -71,7 +71,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeChannelReadNow(final ChannelHandlerContext ctx, final Object msg) {
         try {
-            ((ChannelInboundHandler) ctx.handler()).channelRead(ctx, msg);
+            ctx.handler().channelRead(ctx, msg);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -79,7 +79,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeChannelReadCompleteNow(final ChannelHandlerContext ctx) {
         try {
-            ((ChannelInboundHandler) ctx.handler()).channelReadComplete(ctx);
+            ctx.handler().channelReadComplete(ctx);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -87,7 +87,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeChannelWritabilityChangedNow(final ChannelHandlerContext ctx) {
         try {
-            ((ChannelInboundHandler) ctx.handler()).channelWritabilityChanged(ctx);
+            ctx.handler().channelWritabilityChanged(ctx);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -96,7 +96,7 @@ public final class ChannelHandlerInvokerUtil {
     public static void invokeBindNow(
             final ChannelHandlerContext ctx, final SocketAddress localAddress, final ChannelPromise promise) {
         try {
-            ((ChannelOutboundHandler) ctx.handler()).bind(ctx, localAddress, promise);
+            ctx.handler().bind(ctx, localAddress, promise);
         } catch (Throwable t) {
             notifyOutboundHandlerException(t, promise);
         }
@@ -105,7 +105,7 @@ public final class ChannelHandlerInvokerUtil {
             final ChannelHandlerContext ctx,
             final SocketAddress remoteAddress, final SocketAddress localAddress, final ChannelPromise promise) {
         try {
-            ((ChannelOutboundHandler) ctx.handler()).connect(ctx, remoteAddress, localAddress, promise);
+            ctx.handler().connect(ctx, remoteAddress, localAddress, promise);
         } catch (Throwable t) {
             notifyOutboundHandlerException(t, promise);
         }
@@ -113,7 +113,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeDisconnectNow(final ChannelHandlerContext ctx, final ChannelPromise promise) {
         try {
-            ((ChannelOutboundHandler) ctx.handler()).disconnect(ctx, promise);
+            ctx.handler().disconnect(ctx, promise);
         } catch (Throwable t) {
             notifyOutboundHandlerException(t, promise);
         }
@@ -121,7 +121,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeCloseNow(final ChannelHandlerContext ctx, final ChannelPromise promise) {
         try {
-            ((ChannelOutboundHandler) ctx.handler()).close(ctx, promise);
+            ctx.handler().close(ctx, promise);
         } catch (Throwable t) {
             notifyOutboundHandlerException(t, promise);
         }
@@ -129,7 +129,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeReadNow(final ChannelHandlerContext ctx) {
         try {
-            ((ChannelOutboundHandler) ctx.handler()).read(ctx);
+            ctx.handler().read(ctx);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }
@@ -137,7 +137,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeWriteNow(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
         try {
-            ((ChannelOutboundHandler) ctx.handler()).write(ctx, msg, promise);
+            ctx.handler().write(ctx, msg, promise);
         } catch (Throwable t) {
             notifyOutboundHandlerException(t, promise);
         }
@@ -145,7 +145,7 @@ public final class ChannelHandlerInvokerUtil {
 
     public static void invokeFlushNow(final ChannelHandlerContext ctx) {
         try {
-            ((ChannelOutboundHandler) ctx.handler()).flush(ctx);
+            ctx.handler().flush(ctx);
         } catch (Throwable t) {
             notifyHandlerException(ctx, t);
         }

transport/src/main/java/io/netty/channel/ChannelInboundHandler.java

@@ -1,63 +0,0 @@
-/*
- * Copyright 2012 The Netty Project
- *
- * The Netty Project licenses this file to you under the Apache License,
- * version 2.0 (the "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at:
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- */
-package io.netty.channel;
-
-/**
- * {@link ChannelHandler} which adds callbacks for state changes. This allows the user to hook in to state changes
- * easily.
- */
-public interface ChannelInboundHandler extends ChannelHandler {
-
-    /**
-     * The {@link Channel} of the {@link ChannelHandlerContext} was registered with its {@link EventLoop}
-     */
-    void channelRegistered(ChannelHandlerContext ctx) throws Exception;
-
-    /**
-     * The {@link Channel} of the {@link ChannelHandlerContext} is now active
-     */
-    void channelActive(ChannelHandlerContext ctx) throws Exception;
-
-    /**
-     * The {@link Channel} of the {@link ChannelHandlerContext} was registered is now inactive and reached its
-     * end of lifetime.
-     */
-    void channelInactive(ChannelHandlerContext ctx) throws Exception;
-
-    /**
-     * Invoked when the current {@link Channel} has read a message from the peer.
-     */
-    void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception;
-
-    /**
-     * Invoked when the last message read by the current read operation has been consumed by
-     * {@link #channelRead(ChannelHandlerContext, Object)}.  If {@link ChannelOption#AUTO_READ} is off, no further
-     * attempt to read an inbound data from the current {@link Channel} will be made until
-     * {@link ChannelHandlerContext#read()} is called.
-     */
-    void channelReadComplete(ChannelHandlerContext ctx) throws Exception;
-
-    /**
-     * Gets called if an user event was triggered.
-     */
-    void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception;
-
-    /**
-     * Gets called once the writable state of a {@link Channel} changed. You can check the state with
-     * {@link Channel#isWritable()}.
-     */
-    void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception;
-}

transport/src/main/java/io/netty/channel/ChannelInboundHandlerAdapter.java

@@ -16,95 +16,7 @@
 package io.netty.channel;
 
 /**
- * Abstract base class for {@link ChannelInboundHandler} implementations that provides
- * implementations of all of their methods.
- *
- * <p>
- * This implementation just forward the operation to the next {@link ChannelHandler} in the
- * {@link ChannelPipeline}. Sub-classes may override a method implementation to change this.
- * </p>
- * <p>
- * Be aware that messages are not released after the {@link #channelRead(ChannelHandlerContext, Object)}
- * method returns automatically. If you are looking for a {@link ChannelInboundHandler} implementation that
- * releases the received messages automatically, please see {@link SimpleChannelInboundHandler}.
- * </p>
+ * @deprecated Use {@link ChannelHandlerAdapter} instead.
  */
-public class ChannelInboundHandlerAdapter extends ChannelHandlerAdapter implements ChannelInboundHandler {
-
-    /**
-     * Calls {@link ChannelHandlerContext#fireChannelRegistered()} to forward
-     * to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
-        ctx.fireChannelRegistered();
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#fireChannelActive()} to forward
-     * to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void channelActive(ChannelHandlerContext ctx) throws Exception {
-        ctx.fireChannelActive();
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#fireChannelInactive()} to forward
-     * to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
-        ctx.fireChannelInactive();
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#fireChannelRead(Object)} to forward
-     * to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
-        ctx.fireChannelRead(msg);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#fireChannelReadComplete()} to forward
-     * to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
-        ctx.fireChannelReadComplete();
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#fireUserEventTriggered(Object)} to forward
-     * to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
-        ctx.fireUserEventTriggered(evt);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#fireChannelWritabilityChanged()} to forward
-     * to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
-        ctx.fireChannelWritabilityChanged();
-    }
-}
+@Deprecated
+public class ChannelInboundHandlerAdapter extends ChannelHandlerAdapter { }

transport/src/main/java/io/netty/channel/ChannelInboundOps.java

@@ -24,8 +24,8 @@ interface ChannelInboundOps {
     /**
      * A {@link Channel} was registered to its {@link EventLoop}.
      *
-     * This will result in having the  {@link ChannelInboundHandler#channelRegistered(ChannelHandlerContext)} method
-     * called of the next  {@link ChannelInboundHandler} contained in the  {@link ChannelPipeline} of the
+     * This will result in having the  {@link ChannelHandler#channelRegistered(ChannelHandlerContext)} method
+     * called of the next  {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelInboundOps fireChannelRegistered();
@@ -33,8 +33,8 @@ interface ChannelInboundOps {
     /**
      * A {@link Channel} is active now, which means it is connected.
      *
-     * This will result in having the  {@link ChannelInboundHandler#channelActive(ChannelHandlerContext)} method
-     * called of the next  {@link ChannelInboundHandler} contained in the  {@link ChannelPipeline} of the
+     * This will result in having the  {@link ChannelHandler#channelActive(ChannelHandlerContext)} method
+     * called of the next  {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelInboundOps fireChannelActive();
@@ -42,8 +42,8 @@ interface ChannelInboundOps {
     /**
      * A {@link Channel} is inactive now, which means it is closed.
      *
-     * This will result in having the  {@link ChannelInboundHandler#channelInactive(ChannelHandlerContext)} method
-     * called of the next  {@link ChannelInboundHandler} contained in the  {@link ChannelPipeline} of the
+     * This will result in having the  {@link ChannelHandler#channelInactive(ChannelHandlerContext)} method
+     * called of the next  {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelInboundOps fireChannelInactive();
@@ -51,8 +51,8 @@ interface ChannelInboundOps {
     /**
      * A {@link Channel} received an {@link Throwable} in one of its inbound operations.
      *
-     * This will result in having the  {@link ChannelInboundHandler#exceptionCaught(ChannelHandlerContext, Throwable)}
-     * method  called of the next  {@link ChannelInboundHandler} contained in the  {@link ChannelPipeline} of the
+     * This will result in having the  {@link ChannelHandler#exceptionCaught(ChannelHandlerContext, Throwable)}
+     * method  called of the next  {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelInboundOps fireExceptionCaught(Throwable cause);
@@ -60,8 +60,8 @@ interface ChannelInboundOps {
     /**
      * A {@link Channel} received an user defined event.
      *
-     * This will result in having the  {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)}
-     * method  called of the next  {@link ChannelInboundHandler} contained in the  {@link ChannelPipeline} of the
+     * This will result in having the  {@link ChannelHandler#userEventTriggered(ChannelHandlerContext, Object)}
+     * method  called of the next  {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelInboundOps fireUserEventTriggered(Object event);
@@ -69,8 +69,8 @@ interface ChannelInboundOps {
     /**
      * A {@link Channel} received a message.
      *
-     * This will result in having the {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object)}
-     * method  called of the next {@link ChannelInboundHandler} contained in the  {@link ChannelPipeline} of the
+     * This will result in having the {@link ChannelHandler#channelRead(ChannelHandlerContext, Object)}
+     * method  called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelInboundOps fireChannelRead(Object msg);
@@ -78,8 +78,8 @@ interface ChannelInboundOps {
     ChannelInboundOps fireChannelReadComplete();
 
     /**
-     * Triggers an {@link ChannelInboundHandler#channelWritabilityChanged(ChannelHandlerContext)}
-     * event to the next {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
+     * Triggers an {@link ChannelHandler#channelWritabilityChanged(ChannelHandlerContext)}
+     * event to the next {@link ChannelHandler} in the {@link ChannelPipeline}.
      */
     ChannelInboundOps fireChannelWritabilityChanged();
 }

transport/src/main/java/io/netty/channel/ChannelInitializer.java

@@ -22,7 +22,7 @@ import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
 
 /**
- * A special {@link ChannelInboundHandler} which offers an easy way to initialize a {@link Channel} once it was
+ * A special {@link ChannelHandler} which offers an easy way to initialize a {@link Channel} once it was
  * registered to its {@link EventLoop}.
  *
  * Implementations are most often used in the context of {@link Bootstrap#handler(ChannelHandler)} ,
@@ -47,7 +47,7 @@ import io.netty.util.internal.logging.InternalLoggerFactory;
  * @param <C>   A sub-type of {@link Channel}
  */
 @Sharable
-public abstract class ChannelInitializer<C extends Channel> extends ChannelInboundHandlerAdapter {
+public abstract class ChannelInitializer<C extends Channel> extends ChannelHandlerAdapter {
 
     private static final InternalLogger logger = InternalLoggerFactory.getInstance(ChannelInitializer.class);
 

transport/src/main/java/io/netty/channel/ChannelOutboundHandler.java

@@ -1,90 +0,0 @@
-/*
- * Copyright 2012 The Netty Project
- *
- * The Netty Project licenses this file to you under the Apache License,
- * version 2.0 (the "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at:
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- */
-package io.netty.channel;
-
-import java.net.SocketAddress;
-
-/**
- * {@link ChannelHandler} which will get notified for IO-outbound-operations.
- */
-public interface ChannelOutboundHandler extends ChannelHandler {
-    /**
-     * Called once a bind operation is made.
-     *
-     * @param ctx           the {@link ChannelHandlerContext} for which the bind operation is made
-     * @param localAddress  the {@link SocketAddress} to which it should bound
-     * @param promise       the {@link ChannelPromise} to notify once the operation completes
-     * @throws Exception    thrown if an error accour
-     */
-    void bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) throws Exception;
-
-    /**
-     * Called once a connect operation is made.
-     *
-     * @param ctx               the {@link ChannelHandlerContext} for which the connect operation is made
-     * @param remoteAddress     the {@link SocketAddress} to which it should connect
-     * @param localAddress      the {@link SocketAddress} which is used as source on connect
-     * @param promise           the {@link ChannelPromise} to notify once the operation completes
-     * @throws Exception        thrown if an error accour
-     */
-    void connect(
-            ChannelHandlerContext ctx, SocketAddress remoteAddress,
-            SocketAddress localAddress, ChannelPromise promise) throws Exception;
-
-    /**
-     * Called once a disconnect operation is made.
-     *
-     * @param ctx               the {@link ChannelHandlerContext} for which the disconnect operation is made
-     * @param promise           the {@link ChannelPromise} to notify once the operation completes
-     * @throws Exception        thrown if an error accour
-     */
-    void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception;
-
-    /**
-     * Called once a close operation is made.
-     *
-     * @param ctx               the {@link ChannelHandlerContext} for which the close operation is made
-     * @param promise           the {@link ChannelPromise} to notify once the operation completes
-     * @throws Exception        thrown if an error accour
-     */
-    void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception;
-
-    /**
-     * Intercepts {@link ChannelHandlerContext#read()}.
-     */
-    void read(ChannelHandlerContext ctx) throws Exception;
-
-    /**
-    * Called once a write operation is made. The write operation will write the messages through the
-     * {@link ChannelPipeline}. Those are then ready to be flushed to the actual {@link Channel} once
-     * {@link Channel#flush()} is called
-     *
-     * @param ctx               the {@link ChannelHandlerContext} for which the write operation is made
-     * @param msg               the message to write
-     * @param promise           the {@link ChannelPromise} to notify once the operation completes
-     * @throws Exception        thrown if an error accour
-     */
-    void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception;
-
-    /**
-     * Called once a flush operation is made. The flush operation will try to flush out all previous written messages
-     * that are pending.
-     *
-     * @param ctx               the {@link ChannelHandlerContext} for which the flush operation is made
-     * @throws Exception        thrown if an error accour
-     */
-    void flush(ChannelHandlerContext ctx) throws Exception;
-}

transport/src/main/java/io/netty/channel/ChannelOutboundHandlerAdapter.java

@@ -15,92 +15,8 @@
  */
 package io.netty.channel;
 
-import java.net.SocketAddress;
-
 /**
- * Skelton implementation of a {@link ChannelOutboundHandler}. This implementation just forwards each method call via
- * the {@link ChannelHandlerContext}.
+ * @deprecated Use {@link ChannelHandlerAdapter} instead.
  */
-public class ChannelOutboundHandlerAdapter extends ChannelHandlerAdapter implements ChannelOutboundHandler {
-
-    /**
-     * Calls {@link ChannelHandlerContext#bind(SocketAddress, ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void bind(ChannelHandlerContext ctx, SocketAddress localAddress,
-            ChannelPromise promise) throws Exception {
-        ctx.bind(localAddress, promise);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#connect(SocketAddress, SocketAddress, ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress,
-            SocketAddress localAddress, ChannelPromise promise) throws Exception {
-        ctx.connect(remoteAddress, localAddress, promise);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#disconnect(ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise)
-            throws Exception {
-        ctx.disconnect(promise);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#close(ChannelPromise)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void close(ChannelHandlerContext ctx, ChannelPromise promise)
-            throws Exception {
-        ctx.close(promise);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#read()} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void read(ChannelHandlerContext ctx) throws Exception {
-        ctx.read();
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#write(Object)} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
-        ctx.write(msg, promise);
-    }
-
-    /**
-     * Calls {@link ChannelHandlerContext#flush()} to forward
-     * to the next {@link ChannelOutboundHandler} in the {@link ChannelPipeline}.
-     *
-     * Sub-classes may override this method to change behavior.
-     */
-    @Override
-    public void flush(ChannelHandlerContext ctx) throws Exception {
-        ctx.flush();
-    }
-}
+@Deprecated
+public class ChannelOutboundHandlerAdapter extends ChannelHandlerAdapter { }

transport/src/main/java/io/netty/channel/ChannelOutboundOps.java

@@ -28,8 +28,8 @@ interface ChannelOutboundOps {
      * completes, either because the operation was successful or because of an error.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)} method
-     * called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)} method
+     * called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture bind(SocketAddress localAddress);
@@ -43,8 +43,8 @@ interface ChannelOutboundOps {
      * will be used.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture connect(SocketAddress remoteAddress);
@@ -55,8 +55,8 @@ interface ChannelOutboundOps {
      * an error.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress);
@@ -66,8 +66,8 @@ interface ChannelOutboundOps {
      * either because the operation was successful or because of an error.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#disconnect(ChannelHandlerContext, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#disconnect(ChannelHandlerContext, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture disconnect();
@@ -80,8 +80,8 @@ interface ChannelOutboundOps {
      * After it is closed it is not possible to reuse it again.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#close(ChannelHandlerContext, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#close(ChannelHandlerContext, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture close();
@@ -93,8 +93,8 @@ interface ChannelOutboundOps {
      * The given {@link ChannelPromise} will be notified.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)} method
-     * called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)} method
+     * called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture bind(SocketAddress localAddress, ChannelPromise promise);
@@ -111,8 +111,8 @@ interface ChannelOutboundOps {
      * will be used.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture connect(SocketAddress remoteAddress, ChannelPromise promise);
@@ -125,8 +125,8 @@ interface ChannelOutboundOps {
      * The given {@link ChannelPromise} will be notified and also returned.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise);
@@ -138,8 +138,8 @@ interface ChannelOutboundOps {
      * The given {@link ChannelPromise} will be notified.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#disconnect(ChannelHandlerContext, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#disconnect(ChannelHandlerContext, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture disconnect(ChannelPromise promise);
@@ -153,22 +153,22 @@ interface ChannelOutboundOps {
      * The given {@link ChannelPromise} will be notified.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#close(ChannelHandlerContext, ChannelPromise)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#close(ChannelHandlerContext, ChannelPromise)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelFuture close(ChannelPromise promise);
 
     /**
      * Request to Read data from the {@link Channel} into the first inbound buffer, triggers an
-     * {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object)} event if data was
+     * {@link ChannelHandler#channelRead(ChannelHandlerContext, Object)} event if data was
      * read, and triggers a
-     * {@link ChannelInboundHandler#channelReadComplete(ChannelHandlerContext) channelReadComplete} event so the
+     * {@link ChannelHandler#channelReadComplete(ChannelHandlerContext) channelReadComplete} event so the
      * handler can decide to continue reading.  If there's a pending read operation already, this method does nothing.
      * <p>
      * This will result in having the
-     * {@link ChannelOutboundHandler#read(ChannelHandlerContext)}
-     * method called of the next {@link ChannelOutboundHandler} contained in the  {@link ChannelPipeline} of the
+     * {@link ChannelHandler#read(ChannelHandlerContext)}
+     * method called of the next {@link ChannelHandler} contained in the  {@link ChannelPipeline} of the
      * {@link Channel}.
      */
     ChannelOutboundOps read();

transport/src/main/java/io/netty/channel/ChannelPipeline.java

@@ -42,11 +42,11 @@ import java.util.NoSuchElementException;
  * <h3>How an event flows in a pipeline</h3>
  *
  * The following diagram describes how I/O events are processed by {@link ChannelHandler}s in a {@link ChannelPipeline}
- * typically. An I/O event is handled by either a {@link ChannelInboundHandler} or a {@link ChannelOutboundHandler}
- * and be forwarded to its closest handler by calling the event propagation methods defined in
- * {@link ChannelHandlerContext}, such as {@link ChannelHandlerContext#fireChannelRead(Object)} and
- * {@link ChannelHandlerContext#write(Object)}.
- *
+ * typically. An I/O event is handled by a {@link ChannelHandler} and is forwarded by the {@link ChannelHandler} which
+ * handled the event to the {@link ChannelHandler} which is placed right next to it. A {@link ChannelHandler} can also
+ * trigger an arbitrary I/O event if necessary.  To forward or trigger an event, a {@link ChannelHandler} calls the
+ * event propagation methods defined in {@link ChannelHandlerContext}, such as
+ * {@link ChannelHandlerContext#fireChannelRead(Object)} and {@link ChannelHandlerContext#write(Object)}.
  * <pre>
  *                                                 I/O Request
  *                                            via {@link Channel} or
@@ -55,28 +55,28 @@ import java.util.NoSuchElementException;
  *  +---------------------------------------------------+---------------+
  *  |                           ChannelPipeline         |               |
  *  |                                                  \|/              |
- *  |    +---------------------+            +-----------+----------+    |
- *  |    | Inbound Handler  N  |            | Outbound Handler  1  |    |
- *  |    +----------+----------+            +-----------+----------+    |
+ *  |    +----------------------------------------------+----------+    |
+ *  |    |                   ChannelHandler  N                     |    |
+ *  |    +----------+-----------------------------------+----------+    |
  *  |              /|\                                  |               |
  *  |               |                                  \|/              |
- *  |    +----------+----------+            +-----------+----------+    |
- *  |    | Inbound Handler N-1 |            | Outbound Handler  2  |    |
- *  |    +----------+----------+            +-----------+----------+    |
+ *  |    +----------+-----------------------------------+----------+    |
+ *  |    |                   ChannelHandler N-1                    |    |
+ *  |    +----------+-----------------------------------+----------+    |
  *  |              /|\                                  .               |
  *  |               .                                   .               |
  *  | ChannelHandlerContext.fireIN_EVT() ChannelHandlerContext.OUT_EVT()|
  *  |          [method call]                      [method call]         |
  *  |               .                                   .               |
  *  |               .                                  \|/              |
- *  |    +----------+----------+            +-----------+----------+    |
- *  |    | Inbound Handler  2  |            | Outbound Handler M-1 |    |
- *  |    +----------+----------+            +-----------+----------+    |
+ *  |    +----------+-----------------------------------+----------+    |
+ *  |    |                   ChannelHandler  2                     |    |
+ *  |    +----------+-----------------------------------+----------+    |
  *  |              /|\                                  |               |
  *  |               |                                  \|/              |
- *  |    +----------+----------+            +-----------+----------+    |
- *  |    | Inbound Handler  1  |            | Outbound Handler  M  |    |
- *  |    +----------+----------+            +-----------+----------+    |
+ *  |    +----------+-----------------------------------+----------+    |
+ *  |    |                   ChannelHandler  1                     |    |
+ *  |    +----------+-----------------------------------+----------+    |
  *  |              /|\                                  |               |
  *  +---------------+-----------------------------------+---------------+
  *                  |                                  \|/
@@ -87,45 +87,23 @@ import java.util.NoSuchElementException;
  *  |  Netty Internal I/O Threads (Transport Implementation)            |
  *  +-------------------------------------------------------------------+
  * </pre>
- * An inbound event is handled by the inbound handlers in the bottom-up direction as shown on the left side of the
- * diagram.  An inbound handler usually handles the inbound data generated by the I/O thread on the bottom of the
- * diagram.  The inbound data is often read from a remote peer via the actual input operation such as
- * {@link SocketChannel#read(ByteBuffer)}.  If an inbound event goes beyond the top inbound handler, it is discarded
- * silently, or logged if it needs your attention.
+ * An inbound event is handled by the {@link ChannelHandler}s in the bottom-up direction as shown on the left side of
+ * the diagram.  An inbound event is usually triggered by the I/O thread on the bottom of the diagram so that the
+ * {@link ChannelHandler}s are notified when the state of a {@link Channel} changes (e.g. newly established connections
+ * and closed connections) or the inbound data was read from a remote peer.  If an inbound event goes beyond the
+ * {@link ChannelHandler} at the top of the diagram, it is discarded and logged, depending on your loglevel.
+ *
  * <p>
- * An outbound event is handled by the outbound handler in the top-down direction as shown on the right side of the
- * diagram.  An outbound handler usually generates or transforms the outbound traffic such as write requests.
- * If an outbound event goes beyond the bottom outbound handler, it is handled by an I/O thread associated with the
- * {@link Channel}. The I/O thread often performs the actual output operation such as
- * {@link SocketChannel#write(ByteBuffer)}.
+ * An outbound event is handled by the {@link ChannelHandler}s in the top-down direction as shown on the right side of
+ * the diagram.  An outbound event is usually triggered by your code that requests an outbound I/O operation, such as
+ * a write request and a connection attempt.  If an outbound event goes beyond the {@link ChannelHandler} at the
+ * bottom of the diagram, it is handled by an I/O thread associated with the {@link Channel}. The I/O thread often
+ * performs the actual output operation such as {@link SocketChannel#write(ByteBuffer)}.
  * <p>
- * For example, let us assume that we created the following pipeline:
- * <pre>
- * {@link ChannelPipeline} p = ...;
- * p.addLast("1", new InboundHandlerA());
- * p.addLast("2", new InboundHandlerB());
- * p.addLast("3", new OutboundHandlerA());
- * p.addLast("4", new OutboundHandlerB());
- * p.addLast("5", new InboundOutboundHandlerX());
- * </pre>
- * In the example above, the class whose name starts with {@code Inbound} means it is an inbound handler.
- * The class whose name starts with {@code Outbound} means it is a outbound handler.
- * <p>
- * In the given example configuration, the handler evaluation order is 1, 2, 3, 4, 5 when an event goes inbound.
- * When an event goes outbound, the order is 5, 4, 3, 2, 1.  On top of this principle, {@link ChannelPipeline} skips
- * the evaluation of certain handlers to shorten the stack depth:
- * <ul>
- * <li>3 and 4 don't implement {@link ChannelInboundHandler}, and therefore the actual evaluation order of an inbound
- *     event will be: 1, 2, and 5.</li>
- * <li>1 and 2 don't implement {@link ChannelOutboundHandler}, and therefore the actual evaluation order of a
- *     outbound event will be: 5, 4, and 3.</li>
- * <li>If 5 implements both {@link ChannelInboundHandler} and {@link ChannelOutboundHandler}, the evaluation order of
- *     an inbound and a outbound event could be 125 and 543 respectively.</li>
- * </ul>
  *
  * <h3>Forwarding an event to the next handler</h3>
  *
- * As you might noticed in the diagram shows, a handler has to invoke the event propagation methods in
+ * As explained briefly above, a {@link ChannelHandler} has to invoke the event propagation methods in
  * {@link ChannelHandlerContext} to forward an event to its next handler.  Those methods include:
  * <ul>
  * <li>Inbound event propagation methods:
@@ -156,7 +134,7 @@ import java.util.NoSuchElementException;
  * and the following example shows how the event propagation is usually done:
  *
  * <pre>
- * public class MyInboundHandler extends {@link ChannelInboundHandlerAdapter} {
+ * public class MyInboundHandler extends {@link ChannelHandlerAdapter} {
  *     {@code @Override}
  *     public void channelActive({@link ChannelHandlerContext} ctx) {
  *         System.out.println("Connected!");
@@ -164,7 +142,7 @@ import java.util.NoSuchElementException;
  *     }
  * }
  *
- * public clas MyOutboundHandler extends {@link ChannelOutboundHandlerAdapter} {
+ * public clas MyOutboundHandler extends {@link ChannelHandlerAdapter} {
  *     {@code @Override}
  *     public void close({@link ChannelHandlerContext} ctx, {@link ChannelPromise} promise) {
  *         System.out.println("Closing ..");

transport/src/main/java/io/netty/channel/CombinedChannelDuplexHandler.java

@@ -1,195 +0,0 @@
-/*
- * Copyright 2012 The Netty Project
- *
- * The Netty Project licenses this file to you under the Apache License,
- * version 2.0 (the "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at:
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- */
-package io.netty.channel;
-
-import java.net.SocketAddress;
-
-/**
- *  Combines a {@link ChannelInboundHandler} and a {@link ChannelOutboundHandler} into one {@link ChannelHandler}.
- *
- */
-public class CombinedChannelDuplexHandler<I extends ChannelInboundHandler, O extends ChannelOutboundHandler>
-        extends ChannelDuplexHandler {
-
-    private I inboundHandler;
-    private O outboundHandler;
-
-    /**
-     * Creates a new uninitialized instance. A class that extends this handler must invoke
-     * {@link #init(ChannelInboundHandler, ChannelOutboundHandler)} before adding this handler into a
-     * {@link ChannelPipeline}.
-     */
-    protected CombinedChannelDuplexHandler() { }
-
-    /**
-     * Creates a new instance that combines the specified two handlers into one.
-     */
-    public CombinedChannelDuplexHandler(I inboundHandler, O outboundHandler) {
-        init(inboundHandler, outboundHandler);
-    }
-
-    /**
-     * Initialized this handler with the specified handlers.
-     *
-     * @throws IllegalStateException if this handler was not constructed via the default constructor or
-     *                               if this handler does not implement all required handler interfaces
-     * @throws IllegalArgumentException if the specified handlers cannot be combined into one due to a conflict
-     *                                  in the type hierarchy
-     */
-    protected final void init(I inboundHandler, O outboundHandler) {
-        validate(inboundHandler, outboundHandler);
-        this.inboundHandler = inboundHandler;
-        this.outboundHandler = outboundHandler;
-    }
-
-    @SuppressWarnings("InstanceofIncompatibleInterface")
-    private void validate(I inboundHandler, O outboundHandler) {
-        if (this.inboundHandler != null) {
-            throw new IllegalStateException(
-                    "init() can not be invoked if " + CombinedChannelDuplexHandler.class.getSimpleName() +
-                            " was constructed with non-default constructor.");
-        }
-
-        if (inboundHandler == null) {
-            throw new NullPointerException("inboundHandler");
-        }
-        if (outboundHandler == null) {
-            throw new NullPointerException("outboundHandler");
-        }
-        if (inboundHandler instanceof ChannelOutboundHandler) {
-            throw new IllegalArgumentException(
-                    "inboundHandler must not implement " +
-                    ChannelOutboundHandler.class.getSimpleName() + " to get combined.");
-        }
-        if (outboundHandler instanceof ChannelInboundHandler) {
-            throw new IllegalArgumentException(
-                    "outboundHandler must not implement " +
-                    ChannelInboundHandler.class.getSimpleName() + " to get combined.");
-        }
-    }
-
-    protected final I inboundHandler() {
-        return inboundHandler;
-    }
-
-    protected final O outboundHandler() {
-        return outboundHandler;
-    }
-
-    @Override
-    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
-        if (inboundHandler == null) {
-            throw new IllegalStateException(
-                    "init() must be invoked before being added to a " + ChannelPipeline.class.getSimpleName() +
-                            " if " +  CombinedChannelDuplexHandler.class.getSimpleName() +
-                            " was constructed with the default constructor.");
-        }
-        try {
-            inboundHandler.handlerAdded(ctx);
-        } finally {
-            outboundHandler.handlerAdded(ctx);
-        }
-    }
-
-    @Override
-    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
-        try {
-            inboundHandler.handlerRemoved(ctx);
-        } finally {
-            outboundHandler.handlerRemoved(ctx);
-        }
-    }
-
-    @Override
-    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
-        inboundHandler.channelRegistered(ctx);
-    }
-
-    @Override
-    public void channelActive(ChannelHandlerContext ctx) throws Exception {
-        inboundHandler.channelActive(ctx);
-    }
-
-    @Override
-    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
-        inboundHandler.channelInactive(ctx);
-    }
-
-    @Override
-    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
-        inboundHandler.exceptionCaught(ctx, cause);
-    }
-
-    @Override
-    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
-        inboundHandler.userEventTriggered(ctx, evt);
-    }
-
-    @Override
-    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
-        inboundHandler.channelRead(ctx, msg);
-    }
-
-    @Override
-    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
-        inboundHandler.channelReadComplete(ctx);
-    }
-
-    @Override
-    public void bind(
-            ChannelHandlerContext ctx,
-            SocketAddress localAddress, ChannelPromise promise) throws Exception {
-        outboundHandler.bind(ctx, localAddress, promise);
-    }
-
-    @Override
-    public void connect(
-            ChannelHandlerContext ctx,
-            SocketAddress remoteAddress, SocketAddress localAddress,
-            ChannelPromise promise) throws Exception {
-        outboundHandler.connect(ctx, remoteAddress, localAddress, promise);
-    }
-
-    @Override
-    public void disconnect(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
-        outboundHandler.disconnect(ctx, promise);
-    }
-
-    @Override
-    public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
-        outboundHandler.close(ctx, promise);
-    }
-
-    @Override
-    public void read(ChannelHandlerContext ctx) throws Exception {
-        outboundHandler.read(ctx);
-    }
-
-    @Override
-    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
-        outboundHandler.write(ctx, msg, promise);
-    }
-
-    @Override
-    public void flush(ChannelHandlerContext ctx) throws Exception {
-        outboundHandler.flush(ctx);
-    }
-
-    @Override
-    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
-        inboundHandler.channelWritabilityChanged(ctx);
-    }
-}

transport/src/main/java/io/netty/channel/DefaultChannelHandlerContext.java

@@ -16,13 +16,160 @@
 package io.netty.channel;
 
 import io.netty.buffer.ByteBufAllocator;
+import io.netty.channel.ChannelHandler.Skip;
 import io.netty.util.DefaultAttributeMap;
 import io.netty.util.concurrent.EventExecutor;
+import io.netty.util.internal.PlatformDependent;
 
 import java.net.SocketAddress;
+import java.util.WeakHashMap;
 
 final class DefaultChannelHandlerContext extends DefaultAttributeMap implements ChannelHandlerContext {
 
+    // This class keeps an integer member field 'skipFlags' whose each bit tells if the corresponding handler method
+    // is annotated with @Skip. 'skipFlags' is retrieved in runtime via the reflection API and is cached.
+    // The following constants signify which bit of 'skipFlags' corresponds to which handler method:
+
+    static final int MASK_HANDLER_ADDED = 1;
+    static final int MASK_HANDLER_REMOVED = 1 << 1;
+    private static final int MASK_EXCEPTION_CAUGHT = 1 << 2;
+    private static final int MASK_CHANNEL_REGISTERED = 1 << 3;
+    private static final int MASK_CHANNEL_ACTIVE = 1 << 4;
+    private static final int MASK_CHANNEL_INACTIVE = 1 << 5;
+    private static final int MASK_CHANNEL_READ = 1 << 6;
+    private static final int MASK_CHANNEL_READ_COMPLETE = 1 << 7;
+    private static final int MASK_CHANNEL_WRITABILITY_CHANGED = 1 << 8;
+    private static final int MASK_USER_EVENT_TRIGGERED = 1 << 9;
+    private static final int MASK_BIND = 1 << 10;
+    private static final int MASK_CONNECT = 1 << 11;
+    private static final int MASK_DISCONNECT = 1 << 12;
+    private static final int MASK_CLOSE = 1 << 13;
+    private static final int MASK_READ = 1 << 14;
+    private static final int MASK_WRITE = 1 << 15;
+    private static final int MASK_FLUSH = 1 << 16;
+
+    /**
+     * Cache the result of the costly generation of {@link #skipFlags} in the partitioned synchronized
+     * {@link WeakHashMap}.
+     */
+    @SuppressWarnings("unchecked")
+    private static final WeakHashMap<Class<?>, Integer>[] skipFlagsCache =
+            new WeakHashMap[Runtime.getRuntime().availableProcessors()];
+
+    static {
+        for (int i = 0; i < skipFlagsCache.length; i ++) {
+            skipFlagsCache[i] = new WeakHashMap<Class<?>, Integer>();
+        }
+    }
+
+    /**
+     * Returns an integer bitset that tells which handler methods were annotated with {@link Skip}.
+     * It gets the value from {@link #skipFlagsCache} if an handler of the same type were queried before.
+     * Otherwise, it delegates to {@link #skipFlags0(Class)} to get it.
+     */
+    private static int skipFlags(ChannelHandler handler) {
+        WeakHashMap<Class<?>, Integer> cache =
+                skipFlagsCache[(int) (Thread.currentThread().getId() % skipFlagsCache.length)];
+        Class<? extends ChannelHandler> handlerType = handler.getClass();
+        int flagsVal;
+        synchronized (cache) {
+            Integer flags = cache.get(handlerType);
+            if (flags != null) {
+                flagsVal = flags;
+            } else {
+                flagsVal = skipFlags0(handlerType);
+                cache.put(handlerType, Integer.valueOf(flagsVal));
+            }
+        }
+
+        return flagsVal;
+    }
+
+    /**
+     * Determines the {@link #skipFlags} of the specified {@code handlerType} using the reflection API.
+     */
+    private static int skipFlags0(Class<? extends ChannelHandler> handlerType) {
+        int flags = 0;
+        try {
+            if (handlerType.getMethod(
+                    "handlerAdded", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_HANDLER_ADDED;
+            }
+            if (handlerType.getMethod(
+                    "handlerRemoved", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_HANDLER_REMOVED;
+            }
+            if (handlerType.getMethod(
+                    "exceptionCaught", ChannelHandlerContext.class, Throwable.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_EXCEPTION_CAUGHT;
+            }
+            if (handlerType.getMethod(
+                    "channelRegistered", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CHANNEL_REGISTERED;
+            }
+            if (handlerType.getMethod(
+                    "channelActive", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CHANNEL_ACTIVE;
+            }
+            if (handlerType.getMethod(
+                    "channelInactive", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CHANNEL_INACTIVE;
+            }
+            if (handlerType.getMethod(
+                    "channelRead", ChannelHandlerContext.class, Object.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CHANNEL_READ;
+            }
+            if (handlerType.getMethod(
+                    "channelReadComplete", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CHANNEL_READ_COMPLETE;
+            }
+            if (handlerType.getMethod(
+                    "channelWritabilityChanged", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CHANNEL_WRITABILITY_CHANGED;
+            }
+            if (handlerType.getMethod(
+                    "userEventTriggered", ChannelHandlerContext.class, Object.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_USER_EVENT_TRIGGERED;
+            }
+            if (handlerType.getMethod(
+                    "bind", ChannelHandlerContext.class,
+                    SocketAddress.class, ChannelPromise.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_BIND;
+            }
+            if (handlerType.getMethod(
+                    "connect", ChannelHandlerContext.class, SocketAddress.class, SocketAddress.class,
+                    ChannelPromise.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CONNECT;
+            }
+            if (handlerType.getMethod(
+                    "disconnect", ChannelHandlerContext.class, ChannelPromise.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_DISCONNECT;
+            }
+            if (handlerType.getMethod(
+                    "close", ChannelHandlerContext.class, ChannelPromise.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_CLOSE;
+            }
+            if (handlerType.getMethod(
+                    "read", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_READ;
+            }
+            if (handlerType.getMethod(
+                    "write", ChannelHandlerContext.class,
+                    Object.class, ChannelPromise.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_WRITE;
+            }
+            if (handlerType.getMethod(
+                    "flush", ChannelHandlerContext.class).isAnnotationPresent(Skip.class)) {
+                flags |= MASK_FLUSH;
+            }
+        } catch (Exception e) {
+            // Should never reach here.
+            PlatformDependent.throwException(e);
+        }
+
+        return flags;
+    }
+
     volatile DefaultChannelHandlerContext next;
     volatile DefaultChannelHandlerContext prev;
 
@@ -32,6 +179,8 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
     private final ChannelHandler handler;
     private boolean removed;
 
+    final int skipFlags;
+
     // Will be set to null if no child executor should be used, otherwise it will be set to the
     // child executor.
     final ChannelHandlerInvoker invoker;
@@ -58,6 +207,8 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
         this.name = name;
         this.handler = handler;
 
+        skipFlags = skipFlags(handler);
+
         if (invoker == null) {
             this.invoker = channel.unsafe().invoker();
         } else {
@@ -110,6 +261,11 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
         return invoker.executor();
     }
 
+    @Override
+    public ChannelHandlerInvoker invoker() {
+        return invoker;
+    }
+
     @Override
     public ChannelHandler handler() {
         return handler;
@@ -122,56 +278,56 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
 
     @Override
     public ChannelHandlerContext fireChannelRegistered() {
-        DefaultChannelHandlerContext next = findContextInbound();
+        DefaultChannelHandlerContext next = findContextInbound(MASK_CHANNEL_REGISTERED);
         next.invoker.invokeChannelRegistered(next);
         return this;
     }
 
     @Override
     public ChannelHandlerContext fireChannelActive() {
-        DefaultChannelHandlerContext next = findContextInbound();
+        DefaultChannelHandlerContext next = findContextInbound(MASK_CHANNEL_ACTIVE);
         next.invoker.invokeChannelActive(next);
         return this;
     }
 
     @Override
     public ChannelHandlerContext fireChannelInactive() {
-        DefaultChannelHandlerContext next = findContextInbound();
+        DefaultChannelHandlerContext next = findContextInbound(MASK_CHANNEL_INACTIVE);
         next.invoker.invokeChannelInactive(next);
         return this;
     }
 
     @Override
     public ChannelHandlerContext fireExceptionCaught(Throwable cause) {
-        DefaultChannelHandlerContext next = this.next;
+        DefaultChannelHandlerContext next = findContextInbound(MASK_EXCEPTION_CAUGHT);
         next.invoker.invokeExceptionCaught(next, cause);
         return this;
     }
 
     @Override
     public ChannelHandlerContext fireUserEventTriggered(Object event) {
-        DefaultChannelHandlerContext next = findContextInbound();
+        DefaultChannelHandlerContext next = findContextInbound(MASK_USER_EVENT_TRIGGERED);
         next.invoker.invokeUserEventTriggered(next, event);
         return this;
     }
 
     @Override
     public ChannelHandlerContext fireChannelRead(Object msg) {
-        DefaultChannelHandlerContext next = findContextInbound();
+        DefaultChannelHandlerContext next = findContextInbound(MASK_CHANNEL_READ);
         next.invoker.invokeChannelRead(next, msg);
         return this;
     }
 
     @Override
     public ChannelHandlerContext fireChannelReadComplete() {
-        DefaultChannelHandlerContext next = findContextInbound();
+        DefaultChannelHandlerContext next = findContextInbound(MASK_CHANNEL_READ_COMPLETE);
         next.invoker.invokeChannelReadComplete(next);
         return this;
     }
 
     @Override
     public ChannelHandlerContext fireChannelWritabilityChanged() {
-        DefaultChannelHandlerContext next = findContextInbound();
+        DefaultChannelHandlerContext next = findContextInbound(MASK_CHANNEL_WRITABILITY_CHANGED);
         next.invoker.invokeChannelWritabilityChanged(next);
         return this;
     }
@@ -203,7 +359,7 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
 
     @Override
     public ChannelFuture bind(final SocketAddress localAddress, final ChannelPromise promise) {
-        DefaultChannelHandlerContext next = findContextOutbound();
+        DefaultChannelHandlerContext next = findContextOutbound(MASK_BIND);
         next.invoker.invokeBind(next, localAddress, promise);
         return promise;
     }
@@ -215,7 +371,7 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
 
     @Override
     public ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
-        DefaultChannelHandlerContext next = findContextOutbound();
+        DefaultChannelHandlerContext next = findContextOutbound(MASK_CONNECT);
         next.invoker.invokeConnect(next, remoteAddress, localAddress, promise);
         return promise;
     }
@@ -226,21 +382,21 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
             return close(promise);
         }
 
-        DefaultChannelHandlerContext next = findContextOutbound();
+        DefaultChannelHandlerContext next = findContextOutbound(MASK_DISCONNECT);
         next.invoker.invokeDisconnect(next, promise);
         return promise;
     }
 
     @Override
     public ChannelFuture close(ChannelPromise promise) {
-        DefaultChannelHandlerContext next = findContextOutbound();
+        DefaultChannelHandlerContext next = findContextOutbound(MASK_CLOSE);
         next.invoker.invokeClose(next, promise);
         return promise;
     }
 
     @Override
     public ChannelHandlerContext read() {
-        DefaultChannelHandlerContext next = findContextOutbound();
+        DefaultChannelHandlerContext next = findContextOutbound(MASK_READ);
         next.invoker.invokeRead(next);
         return this;
     }
@@ -252,22 +408,25 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
 
     @Override
     public ChannelFuture write(Object msg, ChannelPromise promise) {
-        DefaultChannelHandlerContext next = findContextOutbound();
+        DefaultChannelHandlerContext next = findContextOutbound(MASK_WRITE);
         next.invoker.invokeWrite(next, msg, promise);
         return promise;
     }
 
     @Override
     public ChannelHandlerContext flush() {
-        DefaultChannelHandlerContext next = findContextOutbound();
+        DefaultChannelHandlerContext next = findContextOutbound(MASK_FLUSH);
         next.invoker.invokeFlush(next);
         return this;
     }
 
     @Override
     public ChannelFuture writeAndFlush(Object msg, ChannelPromise promise) {
-        DefaultChannelHandlerContext next = findContextOutbound();
-        next.invoker.invokeWriteAndFlush(next, msg, promise);
+        DefaultChannelHandlerContext next;
+        next = findContextOutbound(MASK_WRITE);
+        next.invoker.invokeWrite(next, msg, promise);
+        next = findContextOutbound(MASK_FLUSH);
+        next.invoker.invokeFlush(next);
         return promise;
     }
 
@@ -300,19 +459,19 @@ final class DefaultChannelHandlerContext extends DefaultAttributeMap implements
         return new FailedChannelFuture(channel(), executor(), cause);
     }
 
-    private DefaultChannelHandlerContext findContextInbound() {
+    private DefaultChannelHandlerContext findContextInbound(int mask) {
         DefaultChannelHandlerContext ctx = this;
         do {
             ctx = ctx.next;
-        } while (!(ctx.handler instanceof ChannelInboundHandler));
+        } while ((ctx.skipFlags & mask) != 0);
         return ctx;
     }
 
-    private DefaultChannelHandlerContext findContextOutbound() {
+    private DefaultChannelHandlerContext findContextOutbound(int mask) {
         DefaultChannelHandlerContext ctx = this;
         do {
             ctx = ctx.prev;
-        } while (!(ctx.handler instanceof ChannelOutboundHandler));
+        } while ((ctx.skipFlags & mask) != 0);
         return ctx;
     }
 

transport/src/main/java/io/netty/channel/DefaultChannelHandlerInvoker.java

@@ -283,16 +283,9 @@ public class DefaultChannelHandlerInvoker implements ChannelHandlerInvoker {
         }
 
         validatePromise(ctx, promise, true);
-        invokeWrite(ctx, msg, false, promise);
-    }
-
-    private void invokeWrite(ChannelHandlerContext ctx, Object msg, boolean flush, ChannelPromise promise) {
 
         if (executor.inEventLoop()) {
             invokeWriteNow(ctx, msg, promise);
-            if (flush) {
-                invokeFlushNow(ctx);
-            }
         } else {
             AbstractChannel channel = (AbstractChannel) ctx.channel();
             int size = channel.estimatorHandle().size(msg);
@@ -303,7 +296,7 @@ public class DefaultChannelHandlerInvoker implements ChannelHandlerInvoker {
                     buffer.incrementPendingOutboundBytes(size);
                 }
             }
-            safeExecuteOutbound(WriteTask.newInstance(ctx, msg, size, flush, promise), promise, msg);
+            safeExecuteOutbound(WriteTask.newInstance(ctx, msg, size, promise), promise, msg);
         }
     }
 
@@ -326,17 +319,6 @@ public class DefaultChannelHandlerInvoker implements ChannelHandlerInvoker {
         }
     }
 
-    @Override
-    public void invokeWriteAndFlush(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
-        if (msg == null) {
-            throw new NullPointerException("msg");
-        }
-
-        validatePromise(ctx, promise, true);
-
-        invokeWrite(ctx, msg, true, promise);
-    }
-
     private static void validatePromise(ChannelHandlerContext ctx, ChannelPromise promise, boolean allowVoidPromise) {
         if (ctx == null) {
             throw new NullPointerException("ctx");
@@ -406,7 +388,6 @@ public class DefaultChannelHandlerInvoker implements ChannelHandlerInvoker {
         private Object msg;
         private ChannelPromise promise;
         private int size;
-        private boolean flush;
 
         private static final Recycler<WriteTask> RECYCLER = new Recycler<WriteTask>() {
             @Override
@@ -416,13 +397,12 @@ public class DefaultChannelHandlerInvoker implements ChannelHandlerInvoker {
         };
 
         private static WriteTask newInstance(
-                ChannelHandlerContext ctx, Object msg, int size, boolean flush, ChannelPromise promise) {
+                ChannelHandlerContext ctx, Object msg, int size, ChannelPromise promise) {
             WriteTask task = RECYCLER.get();
             task.ctx = ctx;
             task.msg = msg;
             task.promise = promise;
             task.size = size;
-            task.flush = flush;
             return task;
         }
 
@@ -443,9 +423,6 @@ public class DefaultChannelHandlerInvoker implements ChannelHandlerInvoker {
                     }
                 }
                 invokeWriteNow(ctx, msg, promise);
-                if (flush) {
-                    invokeFlushNow(ctx);
-                }
             } finally {
                 // Set to null so the GC can collect them directly
                 ctx = null;

transport/src/main/java/io/netty/channel/DefaultChannelPipeline.java

@@ -324,7 +324,7 @@ final class DefaultChannelPipeline implements ChannelPipeline {
         return invoker;
     }
 
-    private String generateName(ChannelHandler handler) {
+    String generateName(ChannelHandler handler) {
         WeakHashMap<Class<?>, String> cache = nameCaches[(int) (Thread.currentThread().getId() % nameCaches.length)];
         Class<?> handlerType = handler.getClass();
         String name;
@@ -529,7 +529,11 @@ final class DefaultChannelPipeline implements ChannelPipeline {
         }
     }
 
-    private void callHandlerAdded(final ChannelHandlerContext ctx) {
+    private void callHandlerAdded(final DefaultChannelHandlerContext ctx) {
+        if ((ctx.skipFlags & DefaultChannelHandlerContext.MASK_HANDLER_ADDED) != 0) {
+            return;
+        }
+
         if (ctx.channel().isRegistered() && !ctx.executor().inEventLoop()) {
             ctx.executor().execute(new Runnable() {
                 @Override
@@ -542,13 +546,13 @@ final class DefaultChannelPipeline implements ChannelPipeline {
         callHandlerAdded0(ctx);
     }
 
-    private void callHandlerAdded0(final ChannelHandlerContext ctx) {
+    private void callHandlerAdded0(final DefaultChannelHandlerContext ctx) {
         try {
             ctx.handler().handlerAdded(ctx);
         } catch (Throwable t) {
             boolean removed = false;
             try {
-                remove((DefaultChannelHandlerContext) ctx);
+                remove(ctx);
                 removed = true;
             } catch (Throwable t2) {
                 if (logger.isWarnEnabled()) {
@@ -569,6 +573,10 @@ final class DefaultChannelPipeline implements ChannelPipeline {
     }
 
     private void callHandlerRemoved(final DefaultChannelHandlerContext ctx) {
+        if ((ctx.skipFlags & DefaultChannelHandlerContext.MASK_HANDLER_REMOVED) != 0) {
+            return;
+        }
+
         if (ctx.channel().isRegistered() && !ctx.executor().inEventLoop()) {
             ctx.executor().execute(new Runnable() {
                 @Override
@@ -970,7 +978,7 @@ final class DefaultChannelPipeline implements ChannelPipeline {
     }
 
     // A special catch-all handler that handles both bytes and messages.
-    static final class TailHandler implements ChannelInboundHandler {
+    static final class TailHandler extends ChannelHandlerAdapter {
 
         @Override
         public void channelRegistered(ChannelHandlerContext ctx) throws Exception { }
@@ -984,12 +992,6 @@ final class DefaultChannelPipeline implements ChannelPipeline {
         @Override
         public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception { }
 
-        @Override
-        public void handlerAdded(ChannelHandlerContext ctx) throws Exception { }
-
-        @Override
-        public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { }
-
         @Override
         public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception { }
 
@@ -1015,7 +1017,7 @@ final class DefaultChannelPipeline implements ChannelPipeline {
         public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { }
     }
 
-    static final class HeadHandler implements ChannelOutboundHandler {
+    static final class HeadHandler extends ChannelHandlerAdapter {
 
         protected final Unsafe unsafe;
 
@@ -1023,16 +1025,6 @@ final class DefaultChannelPipeline implements ChannelPipeline {
             this.unsafe = unsafe;
         }
 
-        @Override
-        public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
-            // NOOP
-        }
-
-        @Override
-        public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
-            // NOOP
-        }
-
         @Override
         public void bind(
                 ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise)
@@ -1072,10 +1064,5 @@ final class DefaultChannelPipeline implements ChannelPipeline {
         public void flush(ChannelHandlerContext ctx) throws Exception {
             unsafe.flush();
         }
-
-        @Override
-        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
-            ctx.fireExceptionCaught(cause);
-        }
     }
 }

transport/src/main/java/io/netty/channel/SimpleChannelInboundHandler.java

@@ -19,7 +19,7 @@ import io.netty.util.ReferenceCountUtil;
 import io.netty.util.internal.TypeParameterMatcher;
 
 /**
- * {@link ChannelInboundHandlerAdapter} which allows to explicit only handle a specific type of messages.
+ * {@link ChannelHandler} which allows to explicit only handle a specific type of messages.
  *
  * For example here is an implementation which only handle {@link String} messages.
  *
@@ -43,7 +43,7 @@ import io.netty.util.internal.TypeParameterMatcher;
  * {@link #messageReceived(ChannelHandlerContext, Object)}.
  * </p>
  */
-public abstract class SimpleChannelInboundHandler<I> extends ChannelInboundHandlerAdapter {
+public abstract class SimpleChannelInboundHandler<I> extends ChannelHandlerAdapter {
 
     private final TypeParameterMatcher matcher;
     private final boolean autoRelease;
@@ -87,7 +87,7 @@ public abstract class SimpleChannelInboundHandler<I> extends ChannelInboundHandl
 
     /**
      * Returns {@code true} if the given message should be handled. If {@code false} it will be passed to the next
-     * {@link ChannelInboundHandler} in the {@link ChannelPipeline}.
+     * {@link ChannelHandler} in the {@link ChannelPipeline}.
      */
     public boolean acceptInboundMessage(Object msg) throws Exception {
         return matcher.match(msg);

transport/src/main/java/io/netty/channel/embedded/EmbeddedChannel.java

@@ -20,8 +20,8 @@ import io.netty.channel.Channel;
 import io.netty.channel.ChannelConfig;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelMetadata;
 import io.netty.channel.ChannelOutboundBuffer;
 import io.netty.channel.ChannelPipeline;
@@ -345,7 +345,7 @@ public class EmbeddedChannel extends AbstractChannel {
         }
     }
 
-    private final class LastInboundHandler extends ChannelInboundHandlerAdapter {
+    private final class LastInboundHandler extends ChannelHandlerAdapter {
         @Override
         public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
             inboundMessages.add(msg);

transport/src/main/java/io/netty/channel/embedded/EmbeddedEventLoop.java

@@ -184,11 +184,6 @@ final class EmbeddedEventLoop extends AbstractEventLoop implements ChannelHandle
         invokeWriteNow(ctx, msg, promise);
     }
 
-    @Override
-    public void invokeWriteAndFlush(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
-        invokeWriteAndFlushNow(ctx, msg, promise);
-    }
-
     @Override
     public void invokeFlush(ChannelHandlerContext ctx) {
         invokeFlushNow(ctx);

transport/src/main/java/io/netty/channel/embedded/package-info.java

@@ -15,7 +15,7 @@
  */
 
 /**
- * A virtual {@link Channel} that helps wrapping a series of handlers to
+ * A virtual {@link io.netty.channel.Channel} that helps wrapping a series of handlers to
  * unit test the handlers or use them in non-I/O context.
  */
 package io.netty.channel.embedded;

transport/src/main/java/io/netty/channel/group/ChannelGroup.java

@@ -20,9 +20,9 @@ import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufHolder;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelId;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ServerChannel;
 import io.netty.util.CharsetUtil;
 import io.netty.util.concurrent.GlobalEventExecutor;
@@ -82,7 +82,7 @@ import java.util.Set;
  *     b.releaseExternalResources();
  * }
  *
- * public class MyHandler extends {@link ChannelInboundHandlerAdapter} {
+ * public class MyHandler extends {@link ChannelHandlerAdapter} {
  *     {@code @Override}
  *     public void channelActive({@link ChannelHandlerContext} ctx) {
  *         // closed on shutdown.

transport/src/main/java/io/netty/channel/socket/ChannelInputShutdownEvent.java

@@ -15,12 +15,12 @@
  */
 package io.netty.channel.socket;
 
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
 
 /**
  * Special event which will be fired and passed to the
- * {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)} methods once the input of
+ * {@link ChannelHandler#userEventTriggered(ChannelHandlerContext, Object)} methods once the input of
  * a {@link SocketChannel} was shutdown and the {@link SocketChannelConfig#isAllowHalfClosure()} method returns
  * {@code true}.
  */

transport/src/main/java/io/netty/channel/socket/SocketChannelConfig.java

@@ -17,8 +17,8 @@ package io.netty.channel.socket;
 
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.channel.ChannelConfig;
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandler;
 import io.netty.channel.ChannelOption;
 import io.netty.channel.MessageSizeEstimator;
 import io.netty.channel.RecvByteBufAllocator;
@@ -151,7 +151,7 @@ public interface SocketChannelConfig extends ChannelConfig {
      * Sets whether the channel should not close itself when its remote peer shuts down output to
      * make the connection half-closed.  If {@code true} the connection is not closed when the
      * remote peer shuts down output. Instead,
-     * {@link ChannelInboundHandler#userEventTriggered(ChannelHandlerContext, Object)}
+     * {@link ChannelHandler#userEventTriggered(ChannelHandlerContext, Object)}
      * is invoked with a {@link ChannelInputShutdownEvent} object. If {@code false}, the connection
      * is closed automatically.
      */

transport/src/test/java/io/netty/bootstrap/BootstrapTest.java

@@ -16,9 +16,9 @@
 
 package io.netty.bootstrap;
 
+import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandler.Sharable;
-import io.netty.channel.ChannelInboundHandler;
-import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.DefaultEventLoopGroup;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.local.LocalAddress;
@@ -37,7 +37,7 @@ public class BootstrapTest {
         EventLoopGroup groupB = new DefaultEventLoopGroup(1);
 
         try {
-            ChannelInboundHandler dummyHandler = new DummyHandler();
+            ChannelHandler dummyHandler = new DummyHandler();
 
             final Bootstrap bootstrapA = new Bootstrap();
             bootstrapA.group(groupA);
@@ -85,7 +85,7 @@ public class BootstrapTest {
         EventLoopGroup groupB = new DefaultEventLoopGroup(1);
 
         try {
-            ChannelInboundHandler dummyHandler = new DummyHandler();
+            ChannelHandler dummyHandler = new DummyHandler();
 
             final Bootstrap bootstrapA = new Bootstrap();
             bootstrapA.group(groupA);
@@ -128,5 +128,5 @@ public class BootstrapTest {
     }
 
     @Sharable
-    private static final class DummyHandler extends ChannelInboundHandlerAdapter { }
+    private static final class DummyHandler extends ChannelHandlerAdapter { }
 }

transport/src/test/java/io/netty/channel/DefaultChannelPipelineTest.java

@@ -56,7 +56,7 @@ public class DefaultChannelPipelineTest {
         final AtomicReference<Channel> peerRef = new AtomicReference<Channel>();
         ServerBootstrap sb = new ServerBootstrap();
         sb.group(group).channel(LocalServerChannel.class);
-        sb.childHandler(new ChannelInboundHandlerAdapter() {
+        sb.childHandler(new ChannelHandlerAdapter() {
             @Override
             public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
                 peerRef.set(ctx.channel());
@@ -116,7 +116,7 @@ public class DefaultChannelPipelineTest {
         assertTrue(handler.called);
     }
 
-    private static final class StringInboundHandler extends ChannelInboundHandlerAdapter {
+    private static final class StringInboundHandler extends ChannelHandlerAdapter {
         boolean called;
 
         @Override
@@ -194,7 +194,7 @@ public class DefaultChannelPipelineTest {
         pipeline.addLast(new ChannelInitializer<Channel>() {
             @Override
             protected void initChannel(Channel ch) throws Exception {
-                ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {
+                ch.pipeline().addLast(new ChannelHandlerAdapter() {
                     @Override
                     public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
                         latch.countDown();
@@ -473,9 +473,9 @@ public class DefaultChannelPipelineTest {
     }
 
     @Sharable
-    private static class TestHandler extends ChannelDuplexHandler { }
+    private static class TestHandler extends ChannelHandlerAdapter { }
 
-    private static class BufferedTestHandler extends ChannelDuplexHandler {
+    private static class BufferedTestHandler extends ChannelHandlerAdapter {
         final Queue<Object> inboundBuffer = new ArrayDeque<Object>();
         final Queue<Object> outboundBuffer = new ArrayDeque<Object>();
 

transport/src/test/java/io/netty/channel/LoggingHandler.java

@@ -19,10 +19,12 @@ import java.net.SocketAddress;
 import java.util.Collections;
 import java.util.EnumSet;
 
-final class LoggingHandler implements ChannelInboundHandler, ChannelOutboundHandler {
+final class LoggingHandler implements ChannelHandler {
 
-    static enum Event { WRITE, FLUSH, BIND, CONNECT, DISCONNECT, CLOSE, READ, WRITABILITY, HANDLER_ADDED,
-        HANDLER_REMOVED, EXCEPTION, READ_COMPLETE, REGISTERED, ACTIVE, INACTIVE, USER };
+    enum Event {
+        WRITE, FLUSH, BIND, CONNECT, DISCONNECT, CLOSE, READ, WRITABILITY, HANDLER_ADDED,
+        HANDLER_REMOVED, EXCEPTION, READ_COMPLETE, REGISTERED, ACTIVE, INACTIVE, USER
+    }
 
     private StringBuilder log = new StringBuilder();
 

transport/src/test/java/io/netty/channel/ReentrantChannelTest.java

@@ -15,19 +15,17 @@
  */
 package io.netty.channel;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.LoggingHandler.Event;
 import io.netty.channel.local.LocalAddress;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
+import org.junit.Test;
 
 import java.nio.channels.ClosedChannelException;
 
-import org.junit.Test;
+import static org.junit.Assert.*;
 
 public class ReentrantChannelTest extends BaseChannelTest {
 
@@ -78,7 +76,7 @@ public class ReentrantChannelTest extends BaseChannelTest {
         clientChannel.config().setWriteBufferLowWaterMark(512);
         clientChannel.config().setWriteBufferHighWaterMark(1024);
 
-        clientChannel.pipeline().addLast(new ChannelInboundHandlerAdapter() {
+        clientChannel.pipeline().addLast(new ChannelHandlerAdapter() {
             @Override
             public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
                 if (!ctx.channel().isWritable()) {
@@ -116,7 +114,7 @@ public class ReentrantChannelTest extends BaseChannelTest {
 
         Channel clientChannel = cb.connect(addr).sync().channel();
 
-        clientChannel.pipeline().addLast(new ChannelOutboundHandlerAdapter() {
+        clientChannel.pipeline().addLast(new ChannelHandlerAdapter() {
 
             int writeCount;
             int flushCount;
@@ -173,7 +171,7 @@ public class ReentrantChannelTest extends BaseChannelTest {
 
         Channel clientChannel = cb.connect(addr).sync().channel();
 
-        clientChannel.pipeline().addLast(new ChannelOutboundHandlerAdapter() {
+        clientChannel.pipeline().addLast(new ChannelHandlerAdapter() {
 
             @Override
             public void write(final ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
@@ -211,7 +209,7 @@ public class ReentrantChannelTest extends BaseChannelTest {
 
         Channel clientChannel = cb.connect(addr).sync().channel();
 
-        clientChannel.pipeline().addLast(new ChannelOutboundHandlerAdapter() {
+        clientChannel.pipeline().addLast(new ChannelHandlerAdapter() {
 
             @Override
             public void flush(ChannelHandlerContext ctx) throws Exception {

transport/src/test/java/io/netty/channel/group/DefaultChannnelGroupTest.java

@@ -17,8 +17,8 @@ package io.netty.channel.group;
 
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
@@ -37,7 +37,7 @@ public class DefaultChannnelGroupTest {
 
         ServerBootstrap b = new ServerBootstrap();
         b.group(bossGroup, workerGroup);
-        b.childHandler(new ChannelInboundHandlerAdapter() {
+        b.childHandler(new ChannelHandlerAdapter() {
             @Override
             public void channelActive(ChannelHandlerContext ctx) {
                 allChannels.add(ctx.channel());