Introduce bypass buffer and use it in LoggingHandler

- Added ChannelBufferHolders.(inbound|outbound)BypassBuffer()
  - The holder returned by these methods returns the next handler's
    buffer.  When a handler's new(Inbound|Outbound)Buffer returns
    a bypass holder, your inboundBufferUpdated() and flush()
    implementation should check if the buffer is a bypass and should not
    modify the content of the buffer.
- Channel(Inbound|Outbound)?HandlerAdapter is now abstract.
  - A user has to specify the exact inbound/outbound buffer type
  - It's because there's no way to determine the best buffer type
- Implemented LoggingHandler using the new API.
  - It doesn't dump received or sent messages yet.
- Fixed a bug where DefaultUnsafe.close() does not trigger deregister()
- Fixed a bug where NioSocketChannel.isActive() does not return false
  when closed

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

@@ -27,6 +27,8 @@ import io.netty.channel.socket.ServerSocketChannel;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.channel.socket.nio.SelectorEventLoop;
+import io.netty.handler.logging.LoggingHandler;
+import io.netty.logging.InternalLogLevel;
 
 import java.net.InetSocketAddress;
 import java.util.ArrayDeque;
@@ -47,6 +49,7 @@ public class EchoServer {
         // Configure the server.
         final EventLoop loop = new MultithreadEventLoop(SelectorEventLoop.class);
         ServerSocketChannel ssc = new NioServerSocketChannel();
+        ssc.pipeline().addLast("logger", new LoggingHandler(InternalLogLevel.INFO));
         ssc.pipeline().addLast("acceptor", new ChannelInboundHandlerAdapter<SocketChannel>() {
 
             @Override
@@ -66,6 +69,7 @@ public class EchoServer {
                     if (s == null) {
                         break;
                     }
+                    s.pipeline().addLast("logger", new LoggingHandler(InternalLogLevel.INFO));
                     s.pipeline().addLast("echoer", new ChannelInboundHandlerAdapter<Byte>() {
                         @Override
                         public ChannelBufferHolder<Byte> newInboundBuffer(ChannelInboundHandlerContext<Byte> ctx) {

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

@@ -15,21 +15,21 @@
  */
 package io.netty.handler.logging;
 
-import static io.netty.buffer.ChannelBuffers.*;
+import io.netty.channel.ChannelBufferHolder;
-
+import io.netty.channel.ChannelBufferHolders;
-import io.netty.buffer.ChannelBuffer;
+import io.netty.channel.ChannelFuture;
-import io.netty.channel.ChannelDownstreamHandler;
-import io.netty.channel.ChannelEvent;
 import io.netty.channel.ChannelHandler;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelUpstreamHandler;
-import io.netty.channel.ExceptionEvent;
-import io.netty.channel.MessageEvent;
 import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerAdapter;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerContext;
+import io.netty.channel.ChannelOutboundHandlerContext;
 import io.netty.logging.InternalLogLevel;
 import io.netty.logging.InternalLogger;
 import io.netty.logging.InternalLoggerFactory;
 
+import java.net.SocketAddress;
+
 /**
  * A {@link ChannelHandler} that logs all events via {@link InternalLogger}.
  * By default, all events are logged at <tt>DEBUG</tt> level.  You can extend
@@ -38,7 +38,7 @@ import io.netty.logging.InternalLoggerFactory;
  * @apiviz.landmark
  */
 @Sharable
-public class LoggingHandler implements ChannelUpstreamHandler, ChannelDownstreamHandler {
+public class LoggingHandler extends ChannelHandlerAdapter<Object, Object> {
 
     private static final InternalLogLevel DEFAULT_LEVEL = InternalLogLevel.DEBUG;
 
@@ -192,45 +192,144 @@ public class LoggingHandler implements ChannelUpstreamHandler, ChannelDownstream
         return level;
     }
 
-    /**
+    protected String message(ChannelHandlerContext ctx, String message) {
-     * Logs the specified event to the {@link InternalLogger} returned by
+        String chStr = ctx.channel().toString();
-     * {@link #getLogger()}. If hex dump has been enabled for this handler,
+        StringBuilder buf = new StringBuilder(chStr.length() + message.length() + 1);
-     * the hex dump of the {@link ChannelBuffer} in a {@link MessageEvent} will
+        buf.append(chStr);
-     * be logged together.
+        buf.append(' ');
-     */
+        buf.append(message);
-    public void log(ChannelEvent e) {
+        return buf.toString();
+    }
+
+    @Override
+    public ChannelBufferHolder<Object> newOutboundBuffer(
+            ChannelOutboundHandlerContext<Object> ctx) throws Exception {
+        return ChannelBufferHolders.outboundBypassBuffer(ctx);
+    }
+
+    @Override
+    public ChannelBufferHolder<Object> newInboundBuffer(
+            ChannelInboundHandlerContext<Object> ctx) throws Exception {
+        return ChannelBufferHolders.inboundBypassBuffer(ctx);
+    }
+
+    @Override
+    public void channelRegistered(ChannelInboundHandlerContext<Object> ctx)
+            throws Exception {
         if (getLogger().isEnabled(level)) {
-            String msg = e.toString();
+            logger.log(level, message(ctx, "REGISTERED"));
-
-            // Append hex dump if necessary.
-            if (hexDump && e instanceof MessageEvent) {
-                MessageEvent me = (MessageEvent) e;
-                if (me.getMessage() instanceof ChannelBuffer) {
-                    ChannelBuffer buf = (ChannelBuffer) me.getMessage();
-                    msg = msg + " - (HEXDUMP: " + hexDump(buf) + ')';
-                }
-            }
-
-            // Log the message (and exception if available.)
-            if (e instanceof ExceptionEvent) {
-                getLogger().log(level, msg, ((ExceptionEvent) e).cause());
-            } else {
-                getLogger().log(level, msg);
-            }
         }
+        super.channelRegistered(ctx);
     }
 
     @Override
-    public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e)
+    public void channelUnregistered(ChannelInboundHandlerContext<Object> ctx)
             throws Exception {
-        log(e);
+        if (getLogger().isEnabled(level)) {
-        ctx.sendUpstream(e);
+            logger.log(level, message(ctx, "UNREGISTERED"));
+        }
+        super.channelUnregistered(ctx);
     }
 
     @Override
-    public void handleDownstream(ChannelHandlerContext ctx, ChannelEvent e)
+    public void channelActive(ChannelInboundHandlerContext<Object> ctx)
             throws Exception {
-        log(e);
+        if (getLogger().isEnabled(level)) {
-        ctx.sendDownstream(e);
+            logger.log(level, message(ctx, "ACTIVE"));
+        }
+        super.channelActive(ctx);
     }
+
+    @Override
+    public void channelInactive(ChannelInboundHandlerContext<Object> ctx)
+            throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, "INACTIVE"));
+        }
+        super.channelInactive(ctx);
+    }
+
+    @Override
+    public void exceptionCaught(ChannelInboundHandlerContext<Object> ctx,
+            Throwable cause) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, String.format("EXCEPTION: %s", cause)), cause);
+        }
+        super.exceptionCaught(ctx, cause);
+    }
+
+    @Override
+    public void userEventTriggered(ChannelInboundHandlerContext<Object> ctx,
+            Object evt) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, String.format("USER_EVENT: %s", evt)));
+        }
+        super.userEventTriggered(ctx, evt);
+    }
+
+    @Override
+    public void inboundBufferUpdated(ChannelInboundHandlerContext<Object> ctx)
+            throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, "INBOUND_UPDATED"));
+        }
+        // TODO Auto-generated method stub
+        super.inboundBufferUpdated(ctx);
+    }
+
+    @Override
+    public void bind(ChannelOutboundHandlerContext<Object> ctx,
+            SocketAddress localAddress, ChannelFuture future) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, String.format("bind(%s)", localAddress)));
+        }
+        super.bind(ctx, localAddress, future);
+    }
+
+    @Override
+    public void connect(ChannelOutboundHandlerContext<Object> ctx,
+            SocketAddress remoteAddress, SocketAddress localAddress,
+            ChannelFuture future) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, String.format("connect(%s, %s)", remoteAddress, localAddress)));
+        }
+        super.connect(ctx, remoteAddress, localAddress, future);
+    }
+
+    @Override
+    public void disconnect(ChannelOutboundHandlerContext<Object> ctx,
+            ChannelFuture future) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, "disconnect()"));
+        }
+        super.disconnect(ctx, future);
+    }
+
+    @Override
+    public void close(ChannelOutboundHandlerContext<Object> ctx,
+            ChannelFuture future) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, "close()"));
+        }
+        super.close(ctx, future);
+    }
+
+    @Override
+    public void deregister(ChannelOutboundHandlerContext<Object> ctx,
+            ChannelFuture future) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, "deregister()"));
+        }
+        super.deregister(ctx, future);
+    }
+
+    @Override
+    public void flush(ChannelOutboundHandlerContext<Object> ctx,
+            ChannelFuture future) throws Exception {
+        if (getLogger().isEnabled(level)) {
+            logger.log(level, message(ctx, "flush()"));
+        }
+        super.flush(ctx, future);
+    }
+
 }

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

@@ -486,6 +486,9 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
                 registered = true;
                 future.setSuccess();
                 pipeline().fireChannelRegistered();
+                if (isActive()) {
+                    pipeline().fireChannelActive();
+                }
             } catch (Throwable t) {
                 // Close the channel directly to avoid FD leak.
                 try {
@@ -615,10 +618,13 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
                     } catch (Throwable t) {
                         future.setFailure(t);
                     }
+
+                    notifyClosureListeners();
                     if (wasActive && !isActive()) {
                         pipeline().fireChannelInactive();
                     }
-                    notifyClosureListeners();
+
+                    deregister(newVoidFuture());
                 } else {
                     // Closed already.
                     future.setSuccess();
@@ -683,12 +689,12 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
                 }
 
                 if (closed) {
-                    close(newFuture());
+                    close(newVoidFuture());
                 }
             } catch (Throwable t) {
                 pipeline().fireExceptionCaught(t);
                 if (t instanceof IOException) {
-                    close(newFuture());
+                    close(newVoidFuture());
                 }
             }
         }

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

@@ -6,13 +6,28 @@ import java.util.Queue;
 
 public final class ChannelBufferHolder<E> {
 
+    private final ChannelHandlerContext ctx;
+    /** 0 - not a bypass, 1 - inbound bypass, 2 - outbound bypass */
+    private final int bypassDirection;
     private final Queue<E> msgBuf;
     private final ChannelBuffer byteBuf;
 
+    ChannelBufferHolder(ChannelHandlerContext ctx, boolean inbound) {
+        if (ctx == null) {
+            throw new NullPointerException("ctx");
+        }
+        this.ctx = ctx;
+        bypassDirection = inbound? 1 : 2;
+        msgBuf = null;
+        byteBuf = null;
+    }
+
     ChannelBufferHolder(Queue<E> msgBuf) {
         if (msgBuf == null) {
             throw new NullPointerException("msgBuf");
         }
+        ctx = null;
+        bypassDirection = 0;
         this.msgBuf = msgBuf;
         byteBuf = null;
 
@@ -22,38 +37,91 @@ public final class ChannelBufferHolder<E> {
         if (byteBuf == null) {
             throw new NullPointerException("byteBuf");
         }
+        ctx = null;
+        bypassDirection = 0;
         msgBuf = null;
         this.byteBuf = byteBuf;
     }
 
+    public boolean isBypass() {
+        return bypassDirection != 0;
+    }
+
     public boolean hasMessageBuffer() {
-        return msgBuf != null;
+        switch (bypassDirection) {
+        case 0:
+            return msgBuf != null;
+        case 1:
+            return ctx.nextIn().hasMessageBuffer();
+        case 2:
+            return ctx.out().hasMessageBuffer();
+        default:
+            throw new Error();
+        }
     }
 
     public boolean hasByteBuffer() {
-        return byteBuf != null;
+        switch (bypassDirection) {
+        case 0:
+            return byteBuf != null;
+        case 1:
+            return ctx.nextIn().hasByteBuffer();
+        case 2:
+            return ctx.out().hasByteBuffer();
+        default:
+            throw new Error();
+        }
     }
 
+    @SuppressWarnings("unchecked")
     public Queue<E> messageBuffer() {
-        if (!hasMessageBuffer()) {
+        switch (bypassDirection) {
-            throw new IllegalStateException("does not have a message buffer");
+        case 0:
+            if (!hasMessageBuffer()) {
+                throw new IllegalStateException("does not have a message buffer");
+            }
+            return msgBuf;
+        case 1:
+            return (Queue<E>) ctx.nextIn().messageBuffer();
+        case 2:
+            return (Queue<E>) ctx.out().messageBuffer();
+        default:
+            throw new Error();
         }
-        return msgBuf;
     }
 
     public ChannelBuffer byteBuffer() {
-        if (!hasByteBuffer()) {
+        switch (bypassDirection) {
-            throw new IllegalStateException("does not have a byte buffer");
+        case 0:
+            if (!hasByteBuffer()) {
+                throw new IllegalStateException("does not have a byte buffer");
+            }
+            return byteBuf;
+        case 1:
+            return ctx.nextIn().byteBuffer();
+        case 2:
+            return ctx.out().byteBuffer();
+        default:
+            throw new Error();
         }
-        return byteBuf;
     }
 
     @Override
     public String toString() {
-        if (hasMessageBuffer()) {
+        switch (bypassDirection) {
-            return messageBuffer().toString();
+        case 0:
-        } else {
+            if (hasMessageBuffer()) {
-            return byteBuffer().toString();
+                return messageBuffer().toString();
+            } else {
+                return byteBuffer().toString();
+            }
+        case 1:
+            return ctx.nextIn().toString();
+        case 2:
+            return ctx.out().toString();
+        default:
+            throw new Error();
         }
+
     }
 }

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

@@ -14,6 +14,14 @@ public final class ChannelBufferHolders {
         return new ChannelBufferHolder<Byte>(buffer);
     }
 
+    public static <E> ChannelBufferHolder<E> inboundBypassBuffer(ChannelHandlerContext ctx) {
+        return new ChannelBufferHolder<E>(ctx, true);
+    }
+
+    public static <E> ChannelBufferHolder<E> outboundBypassBuffer(ChannelHandlerContext ctx) {
+        return new ChannelBufferHolder<E>(ctx, false);
+    }
+
     private ChannelBufferHolders() {
         // Utility class
     }

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

@@ -1,12 +1,8 @@
 package io.netty.channel;
 
-import io.netty.buffer.ChannelBuffer;
-
 import java.net.SocketAddress;
-import java.util.ArrayDeque;
-import java.util.Queue;
 
-public class ChannelHandlerAdapter<I, O> implements ChannelInboundHandler<I>, ChannelOutboundHandler<O> {
+public abstract class ChannelHandlerAdapter<I, O> implements ChannelInboundHandler<I>, ChannelOutboundHandler<O> {
     @Override
     public void beforeAdd(ChannelHandlerContext ctx) throws Exception {
         // Do nothing by default.
@@ -57,29 +53,9 @@ public class ChannelHandlerAdapter<I, O> implements ChannelInboundHandler<I>, Ch
         ctx.fireUserEventTriggered(evt);
     }
 
-    @Override
-    public ChannelBufferHolder<I> newInboundBuffer(ChannelInboundHandlerContext<I> ctx) throws Exception {
-        return ChannelBufferHolders.messageBuffer(new ArrayDeque<I>());
-    }
-
     @Override
     public void inboundBufferUpdated(ChannelInboundHandlerContext<I> ctx) throws Exception {
-        if (ctx.in().hasMessageBuffer()) {
+        ChannelInboundHandlerAdapter.inboundBufferUpdated0(ctx);
-            Queue<I> in = ctx.in().messageBuffer();
-            Queue<Object> nextIn = ctx.nextIn().messageBuffer();
-            for (;;) {
-                I msg = in.poll();
-                if (msg == null) {
-                    break;
-                }
-                nextIn.add(msg);
-            }
-        } else {
-            ChannelBuffer in = ctx.in().byteBuffer();
-            ChannelBuffer nextIn = ctx.nextIn().byteBuffer();
-            nextIn.writeBytes(in);
-        }
-        ctx.fireInboundBufferUpdated();
     }
 
     @Override
@@ -107,28 +83,8 @@ public class ChannelHandlerAdapter<I, O> implements ChannelInboundHandler<I>, Ch
         ctx.deregister(future);
     }
 
-    @Override
-    public ChannelBufferHolder<O> newOutboundBuffer(ChannelOutboundHandlerContext<O> ctx) throws Exception {
-        return ChannelBufferHolders.messageBuffer(new ArrayDeque<O>());
-    }
-
     @Override
     public void flush(ChannelOutboundHandlerContext<O> ctx, ChannelFuture future) throws Exception {
-        if (ctx.prevOut().hasMessageBuffer()) {
+        ChannelOutboundHandlerAdapter.flush0(ctx, future);
-            Queue<O> out = ctx.prevOut().messageBuffer();
-            Queue<Object> nextOut = ctx.out().messageBuffer();
-            for (;;) {
-                O msg = out.poll();
-                if (msg == null) {
-                    break;
-                }
-                nextOut.add(msg);
-            }
-        } else {
-            ChannelBuffer out = ctx.prevOut().byteBuffer();
-            ChannelBuffer nextOut = ctx.out().byteBuffer();
-            nextOut.writeBytes(out);
-        }
-        ctx.flush(future);
     }
 }

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

@@ -2,10 +2,9 @@ package io.netty.channel;
 
 import io.netty.buffer.ChannelBuffer;
 
-import java.util.ArrayDeque;
 import java.util.Queue;
 
-public class ChannelInboundHandlerAdapter<I> implements ChannelInboundHandler<I> {
+public abstract class ChannelInboundHandlerAdapter<I> implements ChannelInboundHandler<I> {
     @Override
     public void beforeAdd(ChannelHandlerContext ctx) throws Exception {
         // Do nothing by default.
@@ -57,12 +56,16 @@ public class ChannelInboundHandlerAdapter<I> implements ChannelInboundHandler<I>
     }
 
     @Override
-    public ChannelBufferHolder<I> newInboundBuffer(ChannelInboundHandlerContext<I> ctx) throws Exception {
+    public void inboundBufferUpdated(ChannelInboundHandlerContext<I> ctx) throws Exception {
-        return ChannelBufferHolders.messageBuffer(new ArrayDeque<I>());
+        inboundBufferUpdated0(ctx);
     }
 
-    @Override
+    static <I> void inboundBufferUpdated0(ChannelInboundHandlerContext<I> ctx) {
-    public void inboundBufferUpdated(ChannelInboundHandlerContext<I> ctx) throws Exception {
+        if (ctx.in().isBypass()) {
+            ctx.fireInboundBufferUpdated();
+            return;
+        }
+
         if (ctx.in().hasMessageBuffer()) {
             Queue<I> in = ctx.in().messageBuffer();
             Queue<Object> nextIn = ctx.nextIn().messageBuffer();
@@ -77,8 +80,8 @@ public class ChannelInboundHandlerAdapter<I> implements ChannelInboundHandler<I>
             ChannelBuffer in = ctx.in().byteBuffer();
             ChannelBuffer nextIn = ctx.nextIn().byteBuffer();
             nextIn.writeBytes(in);
+            in.discardReadBytes();
         }
         ctx.fireInboundBufferUpdated();
     }
-
 }

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

@@ -3,10 +3,9 @@ package io.netty.channel;
 import io.netty.buffer.ChannelBuffer;
 
 import java.net.SocketAddress;
-import java.util.ArrayDeque;
 import java.util.Queue;
 
-public class ChannelOutboundHandlerAdapter<O> implements ChannelOutboundHandler<O> {
+public abstract class ChannelOutboundHandlerAdapter<O> implements ChannelOutboundHandler<O> {
     @Override
     public void beforeAdd(ChannelHandlerContext ctx) throws Exception {
         // Do nothing by default.
@@ -53,12 +52,16 @@ public class ChannelOutboundHandlerAdapter<O> implements ChannelOutboundHandler<
     }
 
     @Override
-    public ChannelBufferHolder<O> newOutboundBuffer(ChannelOutboundHandlerContext<O> ctx) throws Exception {
+    public void flush(ChannelOutboundHandlerContext<O> ctx, ChannelFuture future) throws Exception {
-        return ChannelBufferHolders.messageBuffer(new ArrayDeque<O>());
+        flush0(ctx, future);
     }
 
-    @Override
+    static <O> void flush0(ChannelOutboundHandlerContext<O> ctx, ChannelFuture future) {
-    public void flush(ChannelOutboundHandlerContext<O> ctx, ChannelFuture future) throws Exception {
+        if (ctx.prevOut().isBypass()) {
+            ctx.flush(future);
+            return;
+        }
+
         if (ctx.prevOut().hasMessageBuffer()) {
             Queue<O> out = ctx.prevOut().messageBuffer();
             Queue<Object> nextOut = ctx.out().messageBuffer();
@@ -73,6 +76,7 @@ public class ChannelOutboundHandlerAdapter<O> implements ChannelOutboundHandler<
             ChannelBuffer out = ctx.prevOut().byteBuffer();
             ChannelBuffer nextOut = ctx.out().byteBuffer();
             nextOut.writeBytes(out);
+            out.discardReadBytes();
         }
         ctx.flush(future);
     }

transport/src/main/java/io/netty/channel/socket/nio/NioSocketChannel.java

@@ -82,10 +82,10 @@ public class NioSocketChannel extends AbstractNioChannel implements io.netty.cha
 
     @Override
     public boolean isActive() {
-        return javaChannel().isConnected();
+        SocketChannel ch = javaChannel();
+        return ch.isOpen() && ch.isConnected();
     }
 
-
     @Override
     @SuppressWarnings("unchecked")
     protected ChannelBufferHolder<Object> firstOut() {