Add ReferenceCounted.touch() / Add missing retain() overrides

- Fixes #2163
- Inspector warnings

buffer/src/main/java/io/netty/buffer/AbstractDerivedByteBuf.java

@@ -45,6 +45,12 @@ public abstract class AbstractDerivedByteBuf extends AbstractByteBuf {
         return this;
     }
 
+    @Override
+    public final ByteBuf touch() {
+        unwrap().touch();
+        return this;
+    }
+
     @Override
     public final boolean release() {
         return unwrap().release();

buffer/src/main/java/io/netty/buffer/AbstractReferenceCountedByteBuf.java

@@ -107,6 +107,11 @@ public abstract class AbstractReferenceCountedByteBuf extends AbstractByteBuf {
         return this;
     }
 
+    @Override
+    public final ByteBuf touch() {
+        return this;
+    }
+
     @Override
     public final boolean release() {
         for (;;) {

buffer/src/main/java/io/netty/buffer/AdvancedLeakAwareByteBuf.java

@@ -716,6 +716,12 @@ final class AdvancedLeakAwareByteBuf extends WrappedByteBuf {
         return super.retain(increment);
     }
 
+    @Override
+    public ByteBuf touch() {
+        leak.record();
+        return this;
+    }
+
     @Override
     public ByteBuf capacity(int newCapacity) {
         leak.record();

buffer/src/main/java/io/netty/buffer/ByteBuf.java

@@ -1877,4 +1877,7 @@ public abstract class ByteBuf implements ReferenceCounted, Comparable<ByteBuf> {
 
     @Override
     public abstract ByteBuf retain();
+
+    @Override
+    public abstract ByteBuf touch();
 }

buffer/src/main/java/io/netty/buffer/ByteBufHolder.java

@@ -42,4 +42,7 @@ public interface ByteBufHolder extends ReferenceCounted {
 
     @Override
     ByteBufHolder retain(int increment);
+
+    @Override
+    ByteBufHolder touch();
 }

buffer/src/main/java/io/netty/buffer/DefaultByteBufHolder.java

@@ -68,6 +68,12 @@ public class DefaultByteBufHolder implements ByteBufHolder {
         return this;
     }
 
+    @Override
+    public ByteBufHolder touch() {
+        data.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return data.release();

buffer/src/main/java/io/netty/buffer/EmptyByteBuf.java

@@ -831,6 +831,11 @@ public final class EmptyByteBuf extends ByteBuf {
         return this;
     }
 
+    @Override
+    public ByteBuf touch() {
+        return this;
+    }
+
     @Override
     public boolean release() {
         return false;

buffer/src/main/java/io/netty/buffer/SimpleLeakAwareByteBuf.java

@@ -29,6 +29,11 @@ final class SimpleLeakAwareByteBuf extends WrappedByteBuf {
         this.leak = leak;
     }
 
+    @Override
+    public ByteBuf touch() {
+        return this;
+    }
+
     @Override
     public boolean release() {
         boolean deallocated =  super.release();

buffer/src/main/java/io/netty/buffer/SwappedByteBuf.java

@@ -814,6 +814,12 @@ public final class SwappedByteBuf extends ByteBuf {
         return this;
     }
 
+    @Override
+    public ByteBuf touch() {
+        buf.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return buf.release();
@@ -847,6 +853,6 @@ public final class SwappedByteBuf extends ByteBuf {
 
     @Override
     public String toString() {
-        return "Swapped(" + buf.toString() + ')';
+        return "Swapped(" + buf + ')';
     }
 }

buffer/src/main/java/io/netty/buffer/UnreleasableByteBuf.java

@@ -75,6 +75,11 @@ final class UnreleasableByteBuf extends WrappedByteBuf {
         return this;
     }
 
+    @Override
+    public ByteBuf touch() {
+        return this;
+    }
+
     @Override
     public boolean release() {
         return false;

buffer/src/main/java/io/netty/buffer/WrappedByteBuf.java

@@ -799,6 +799,12 @@ public class WrappedByteBuf extends ByteBuf {
         return this;
     }
 
+    @Override
+    public ByteBuf touch() {
+        buf.touch();
+        return this;
+    }
+
     @Override
     public boolean isReadable(int size) {
         return buf.isReadable(size);

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

@@ -49,6 +49,11 @@ final class ComposedLastHttpContent implements LastHttpContent {
         return this;
     }
 
+    @Override
+    public LastHttpContent touch() {
+        return this;
+    }
+
     @Override
     public LastHttpContent duplicate() {
         return copy();

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

@@ -72,6 +72,12 @@ public class DefaultFullHttpRequest extends DefaultHttpRequest implements FullHt
         return this;
     }
 
+    @Override
+    public FullHttpRequest touch() {
+        content.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return content.release();

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

@@ -75,6 +75,12 @@ public class DefaultFullHttpResponse extends DefaultHttpResponse implements Full
         return this;
     }
 
+    @Override
+    public FullHttpResponse touch() {
+        content.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return content.release();

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

@@ -67,6 +67,12 @@ public class DefaultHttpContent extends DefaultHttpObject implements HttpContent
         return this;
     }
 
+    @Override
+    public HttpContent touch() {
+        content.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return content.release();

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

@@ -69,6 +69,12 @@ public class DefaultLastHttpContent extends DefaultHttpContent implements LastHt
         return this;
     }
 
+    @Override
+    public LastHttpContent touch() {
+        super.touch();
+        return this;
+    }
+
     @Override
     public HttpHeaders trailingHeaders() {
         return trailingHeaders;

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

@@ -29,6 +29,9 @@ public interface FullHttpMessage extends HttpMessage, LastHttpContent {
     @Override
     FullHttpMessage retain();
 
+    @Override
+    FullHttpMessage touch();
+
     @Override
     FullHttpMessage duplicate();
 }

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

@@ -29,6 +29,9 @@ public interface FullHttpRequest extends HttpRequest, FullHttpMessage {
     @Override
     FullHttpRequest retain();
 
+    @Override
+    FullHttpRequest touch();
+
     @Override
     FullHttpRequest duplicate();
 

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

@@ -29,6 +29,9 @@ public interface FullHttpResponse extends HttpResponse, FullHttpMessage {
     @Override
     FullHttpResponse retain();
 
+    @Override
+    FullHttpResponse touch();
+
     @Override
     FullHttpResponse duplicate();
 

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

@@ -38,4 +38,7 @@ public interface HttpContent extends HttpObject, ByteBufHolder {
 
     @Override
     HttpContent retain(int increment);
+
+    @Override
+    HttpContent touch();
 }

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

@@ -74,6 +74,11 @@ public interface LastHttpContent extends HttpContent {
             return this;
         }
 
+        @Override
+        public LastHttpContent touch() {
+            return this;
+        }
+
         @Override
         public boolean release() {
             return false;
@@ -101,6 +106,9 @@ public interface LastHttpContent extends HttpContent {
     @Override
     LastHttpContent retain();
 
+    @Override
+    LastHttpContent touch();
+
     @Override
     LastHttpContent duplicate();
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractDiskHttpData.java

@@ -396,4 +396,9 @@ public abstract class AbstractDiskHttpData extends AbstractHttpData {
     public File getFile() throws IOException {
         return file;
     }
+
+    @Override
+    public HttpData touch() {
+        return this;
+    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractHttpData.java

@@ -130,4 +130,7 @@ public abstract class AbstractHttpData extends AbstractReferenceCounted implemen
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public abstract HttpData touch();
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractMemoryHttpData.java

@@ -257,4 +257,12 @@ public abstract class AbstractMemoryHttpData extends AbstractHttpData {
     public File getFile() throws IOException {
         throw new IOException("Not represented by a file");
     }
+
+    @Override
+    public HttpData touch() {
+        if (byteBuf != null) {
+            byteBuf.touch();
+        }
+        return this;
+    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/Attribute.java

@@ -42,4 +42,7 @@ public interface Attribute extends HttpData {
 
     @Override
     Attribute retain(int increment);
+
+    @Override
+    Attribute touch();
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/DiskAttribute.java

@@ -122,7 +122,7 @@ public class DiskAttribute extends AbstractDiskHttpData implements Attribute {
         try {
             return getName() + '=' + getValue();
         } catch (IOException e) {
-            return getName() + "=IoException";
+            return getName() + '=' + e;
         }
     }
 
@@ -192,4 +192,10 @@ public class DiskAttribute extends AbstractDiskHttpData implements Attribute {
         super.retain();
         return this;
     }
+
+    @Override
+    public Attribute touch() {
+        super.touch();
+        return this;
+    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/DiskFileUpload.java

@@ -211,4 +211,10 @@ public class DiskFileUpload extends AbstractDiskHttpData implements FileUpload {
         super.retain();
         return this;
     }
+
+    @Override
+    public FileUpload touch() {
+        super.touch();
+        return this;
+    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/FileUpload.java

@@ -67,4 +67,7 @@ public interface FileUpload extends HttpData {
 
     @Override
     FileUpload retain(int increment);
+
+    @Override
+    FileUpload touch();
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpData.java

@@ -208,4 +208,7 @@ public interface HttpData extends InterfaceHttpData, ByteBufHolder {
 
     @Override
     HttpData retain(int increment);
+
+    @Override
+    HttpData touch();
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpPostRequestEncoder.java

@@ -1161,6 +1161,7 @@ public class HttpPostRequestEncoder implements ChunkedInput<HttpContent> {
 
     private static final class WrappedFullHttpRequest extends WrappedHttpRequest implements FullHttpRequest {
         private final HttpContent content;
+
         private WrappedFullHttpRequest(HttpRequest request, HttpContent content) {
             super(request);
             this.content = content;
@@ -1214,6 +1215,12 @@ public class HttpPostRequestEncoder implements ChunkedInput<HttpContent> {
             return this;
         }
 
+        @Override
+        public FullHttpRequest touch() {
+            content.touch();
+            return this;
+        }
+
         @Override
         public ByteBuf content() {
             return content.content();

codec-http/src/main/java/io/netty/handler/codec/http/multipart/InterfaceHttpData.java

@@ -35,4 +35,13 @@ public interface InterfaceHttpData extends Comparable<InterfaceHttpData>, Refere
      * @return The HttpDataType
      */
     HttpDataType getHttpDataType();
+
+    @Override
+    InterfaceHttpData retain();
+
+    @Override
+    InterfaceHttpData retain(int increment);
+
+    @Override
+    InterfaceHttpData touch();
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/InternalAttribute.java

@@ -125,4 +125,28 @@ final class InternalAttribute extends AbstractReferenceCounted implements Interf
     protected void deallocate() {
         // Do nothing
     }
+
+    @Override
+    public InterfaceHttpData retain() {
+        for (ByteBuf buf: value) {
+            buf.retain();
+        }
+        return this;
+    }
+
+    @Override
+    public InterfaceHttpData retain(int increment) {
+        for (ByteBuf buf: value) {
+            buf.retain(increment);
+        }
+        return this;
+    }
+
+    @Override
+    public InterfaceHttpData touch() {
+        for (ByteBuf buf: value) {
+            buf.touch();
+        }
+        return this;
+    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/MemoryAttribute.java

@@ -153,4 +153,10 @@ public class MemoryAttribute extends AbstractMemoryHttpData implements Attribute
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public Attribute touch() {
+        super.touch();
+        return this;
+    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/MemoryFileUpload.java

@@ -171,4 +171,10 @@ public class MemoryFileUpload extends AbstractMemoryHttpData implements FileUplo
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public FileUpload touch() {
+        super.touch();
+        return this;
+    }
 }

codec-http/src/main/java/io/netty/handler/codec/http/multipart/MixedAttribute.java

@@ -54,7 +54,7 @@ public class MixedAttribute implements Attribute {
                 // revert to Memory mode
                 try {
                     attribute = new MemoryAttribute(name, value, charset);
-                } catch (IOException e1) {
+                } catch (IOException ignore) {
                     throw new IllegalArgumentException(e);
                 }
             }
@@ -221,7 +221,7 @@ public class MixedAttribute implements Attribute {
 
     @Override
     public String toString() {
-        return "Mixed: " + attribute.toString();
+        return "Mixed: " + attribute;
     }
 
     @Override
@@ -279,6 +279,12 @@ public class MixedAttribute implements Attribute {
         return this;
     }
 
+    @Override
+    public Attribute touch() {
+        attribute.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return attribute.release();

codec-http/src/main/java/io/netty/handler/codec/http/multipart/MixedFileUpload.java

@@ -265,7 +265,7 @@ public class MixedFileUpload implements FileUpload {
 
     @Override
     public String toString() {
-        return "Mixed: " + fileUpload.toString();
+        return "Mixed: " + fileUpload;
     }
 
     @Override
@@ -310,6 +310,12 @@ public class MixedFileUpload implements FileUpload {
         return this;
     }
 
+    @Override
+    public FileUpload touch() {
+        fileUpload.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return fileUpload.release();

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

@@ -75,4 +75,10 @@ public class BinaryWebSocketFrame extends WebSocketFrame {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public BinaryWebSocketFrame touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -159,4 +159,10 @@ public class CloseWebSocketFrame extends WebSocketFrame {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public CloseWebSocketFrame touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -140,4 +140,10 @@ public class ContinuationWebSocketFrame extends WebSocketFrame {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public ContinuationWebSocketFrame touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -75,4 +75,10 @@ public class PingWebSocketFrame extends WebSocketFrame {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public PingWebSocketFrame touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -75,4 +75,10 @@ public class PongWebSocketFrame extends WebSocketFrame {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public PongWebSocketFrame touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -115,4 +115,10 @@ public class TextWebSocketFrame extends WebSocketFrame {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public TextWebSocketFrame touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -68,7 +68,7 @@ public abstract class WebSocketFrame extends DefaultByteBufHolder {
 
     @Override
     public String toString() {
-        return StringUtil.simpleClassName(this) + "(data: " + content().toString() + ')';
+        return StringUtil.simpleClassName(this) + "(data: " + content() + ')';
     }
 
     @Override
@@ -82,4 +82,10 @@ public abstract class WebSocketFrame extends DefaultByteBufHolder {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public WebSocketFrame touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -109,6 +109,12 @@ public class DefaultSpdyDataFrame extends DefaultSpdyStreamFrame implements Spdy
         return this;
     }
 
+    @Override
+    public SpdyDataFrame touch() {
+        data.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return data.release();

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

@@ -50,4 +50,7 @@ public interface SpdyDataFrame extends ByteBufHolder, SpdyStreamFrame {
 
     @Override
     SpdyDataFrame retain(int increment);
+
+    @Override
+    SpdyDataFrame touch();
 }

codec-http/src/test/java/io/netty/handler/codec/http/multipart/AbstractMemoryHttpDataTest.java

@@ -68,7 +68,7 @@ public class AbstractMemoryHttpDataTest {
          * @param charset Used charset for data decoding.
          * @param size    Expected data block size.
          */
-        protected TestHttpData(String name, Charset charset, long size) {
+        private TestHttpData(String name, Charset charset, long size) {
             super(name, charset, size);
         }
 

codec-memcache/src/main/java/io/netty/handler/codec/memcache/DefaultLastMemcacheContent.java

@@ -44,6 +44,12 @@ public class DefaultLastMemcacheContent extends DefaultMemcacheContent implement
         return this;
     }
 
+    @Override
+    public LastMemcacheContent touch() {
+        super.touch();
+        return this;
+    }
+
     @Override
     public LastMemcacheContent copy() {
         return new DefaultLastMemcacheContent(content().copy());
@@ -53,5 +59,4 @@ public class DefaultLastMemcacheContent extends DefaultMemcacheContent implement
     public LastMemcacheContent duplicate() {
         return new DefaultLastMemcacheContent(content().duplicate());
     }
-
 }

codec-memcache/src/main/java/io/netty/handler/codec/memcache/DefaultMemcacheContent.java

@@ -67,6 +67,12 @@ public class DefaultMemcacheContent extends AbstractMemcacheObject implements Me
         return this;
     }
 
+    @Override
+    public MemcacheContent touch() {
+        content.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return content.release();
@@ -82,5 +88,4 @@ public class DefaultMemcacheContent extends AbstractMemcacheObject implements Me
         return StringUtil.simpleClassName(this) +
                "(data: " + content() + ", getDecoderResult: " + getDecoderResult() + ')';
     }
-
 }

codec-memcache/src/main/java/io/netty/handler/codec/memcache/FullMemcacheMessage.java

@@ -31,6 +31,8 @@ public interface FullMemcacheMessage extends MemcacheMessage, LastMemcacheConten
     FullMemcacheMessage retain();
 
     @Override
-    FullMemcacheMessage duplicate();
+    FullMemcacheMessage touch();
 
+    @Override
+    FullMemcacheMessage duplicate();
 }

codec-memcache/src/main/java/io/netty/handler/codec/memcache/LastMemcacheContent.java

@@ -45,6 +45,11 @@ public interface LastMemcacheContent extends MemcacheContent {
             return this;
         }
 
+        @Override
+        public LastMemcacheContent touch() {
+            return this;
+        }
+
         @Override
         public LastMemcacheContent duplicate() {
             return this;
@@ -90,6 +95,9 @@ public interface LastMemcacheContent extends MemcacheContent {
     @Override
     LastMemcacheContent retain();
 
+    @Override
+    LastMemcacheContent touch();
+
     @Override
     LastMemcacheContent duplicate();
 }

codec-memcache/src/main/java/io/netty/handler/codec/memcache/MemcacheContent.java

@@ -40,4 +40,6 @@ public interface MemcacheContent extends MemcacheObject, ByteBufHolder {
     @Override
     MemcacheContent retain(int increment);
 
+    @Override
+    MemcacheContent touch();
 }

codec-memcache/src/main/java/io/netty/handler/codec/memcache/MemcacheMessage.java

@@ -34,4 +34,6 @@ public interface MemcacheMessage extends MemcacheObject, ReferenceCounted {
     @Override
     MemcacheMessage retain(int increment);
 
+    @Override
+    MemcacheMessage touch();
 }

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

@@ -107,4 +107,12 @@ public abstract class AbstractBinaryMemcacheMessage<H extends BinaryMemcacheMess
         }
         return false;
     }
+
+    @Override
+    public BinaryMemcacheMessage<H> touch() {
+        if (extras != null) {
+            extras.touch();
+        }
+        return this;
+    }
 }

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

@@ -64,4 +64,6 @@ public interface BinaryMemcacheMessage<H extends BinaryMemcacheMessageHeader> ex
     @Override
     BinaryMemcacheMessage<H> retain(int increment);
 
+    @Override
+    BinaryMemcacheMessage<H> touch();
 }

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

@@ -28,4 +28,12 @@ public interface BinaryMemcacheRequest extends BinaryMemcacheMessage<BinaryMemca
     @Override
     BinaryMemcacheRequestHeader getHeader();
 
+    @Override
+    BinaryMemcacheRequest retain();
+
+    @Override
+    BinaryMemcacheRequest retain(int increment);
+
+    @Override
+    BinaryMemcacheRequest touch();
 }

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

@@ -28,4 +28,12 @@ public interface BinaryMemcacheResponse extends BinaryMemcacheMessage<BinaryMemc
     @Override
     BinaryMemcacheResponseHeader getHeader();
 
+    @Override
+    BinaryMemcacheResponse retain();
+
+    @Override
+    BinaryMemcacheResponse retain(int increment);
+
+    @Override
+    BinaryMemcacheResponse touch();
 }

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

@@ -16,7 +16,6 @@
 package io.netty.handler.codec.memcache.binary;
 
 import io.netty.buffer.ByteBuf;
-import io.netty.buffer.Unpooled;
 
 /**
  * The default implementation of the {@link BinaryMemcacheRequest}.
@@ -64,4 +63,21 @@ public class DefaultBinaryMemcacheRequest extends AbstractBinaryMemcacheMessage<
         super(header, key, extras);
     }
 
+    @Override
+    public BinaryMemcacheRequest retain() {
+        super.retain();
+        return this;
+    }
+
+    @Override
+    public BinaryMemcacheRequest retain(int increment) {
+        super.retain(increment);
+        return this;
+    }
+
+    @Override
+    public BinaryMemcacheRequest touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -16,7 +16,6 @@
 package io.netty.handler.codec.memcache.binary;
 
 import io.netty.buffer.ByteBuf;
-import io.netty.buffer.Unpooled;
 
 /**
  * The default implementation of the {@link BinaryMemcacheResponse}.
@@ -64,4 +63,21 @@ public class DefaultBinaryMemcacheResponse extends AbstractBinaryMemcacheMessage
         super(header, key, extras);
     }
 
+    @Override
+    public BinaryMemcacheResponse retain() {
+        super.retain();
+        return this;
+    }
+
+    @Override
+    public BinaryMemcacheResponse retain(int increment) {
+        super.retain(increment);
+        return this;
+    }
+
+    @Override
+    public BinaryMemcacheResponse touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -77,6 +77,12 @@ public class DefaultFullBinaryMemcacheRequest extends DefaultBinaryMemcacheReque
         return this;
     }
 
+    @Override
+    public FullBinaryMemcacheRequest touch() {
+        content.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return content.release();
@@ -96,5 +102,4 @@ public class DefaultFullBinaryMemcacheRequest extends DefaultBinaryMemcacheReque
     public FullBinaryMemcacheRequest duplicate() {
         return new DefaultFullBinaryMemcacheRequest(getHeader(), getKey(), getExtras(), content().duplicate());
     }
-
 }

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

@@ -77,6 +77,12 @@ public class DefaultFullBinaryMemcacheResponse extends DefaultBinaryMemcacheResp
         return this;
     }
 
+    @Override
+    public FullBinaryMemcacheResponse touch() {
+        content.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         return content.release();
@@ -96,5 +102,4 @@ public class DefaultFullBinaryMemcacheResponse extends DefaultBinaryMemcacheResp
     public FullBinaryMemcacheResponse duplicate() {
         return new DefaultFullBinaryMemcacheResponse(getHeader(), getKey(), getExtras(), content().duplicate());
     }
-
 }

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

@@ -32,6 +32,8 @@ public interface FullBinaryMemcacheRequest extends BinaryMemcacheRequest, FullMe
     FullBinaryMemcacheRequest retain();
 
     @Override
-    FullBinaryMemcacheRequest duplicate();
+    FullBinaryMemcacheRequest touch();
 
+    @Override
+    FullBinaryMemcacheRequest duplicate();
 }

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

@@ -32,6 +32,8 @@ public interface FullBinaryMemcacheResponse extends BinaryMemcacheResponse, Full
     FullBinaryMemcacheResponse retain();
 
     @Override
-    FullBinaryMemcacheResponse duplicate();
+    FullBinaryMemcacheResponse touch();
 
+    @Override
+    FullBinaryMemcacheResponse duplicate();
 }

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

@@ -972,6 +972,12 @@ final class ReplayingDecoderBuffer extends ByteBuf {
         return this;
     }
 
+    @Override
+    public ByteBuf touch() {
+        buffer.touch();
+        return this;
+    }
+
     @Override
     public boolean release() {
         reject();

common/src/main/java/io/netty/util/ReferenceCountUtil.java

@@ -59,6 +59,18 @@ public final class ReferenceCountUtil {
         return msg;
     }
 
+    /**
+     * Tries to call {@link ReferenceCounted#touch()} if the specified message implements {@link ReferenceCounted}.
+     * If the specified message doesn't implement {@link ReferenceCounted}, this method does nothing.
+     */
+    @SuppressWarnings("unchecked")
+    public static <T> T touch(T msg) {
+        if (msg instanceof ReferenceCounted) {
+            return (T) ((ReferenceCounted) msg).touch();
+        }
+        return msg;
+    }
+
     /**
      * Try to call {@link ReferenceCounted#release()} if the specified message implements {@link ReferenceCounted}.
      * If the specified message doesn't implement {@link ReferenceCounted}, this method does nothing.

common/src/main/java/io/netty/util/ReferenceCounted.java

@@ -45,6 +45,13 @@ public interface ReferenceCounted {
      */
     ReferenceCounted retain(int increment);
 
+    /**
+     * Records the current access location of this object for debugging purposes.
+     * If this object is determined to be leaked, the information recorded by this operation will be provided to you
+     * via {@link ResourceLeakDetector}.
+     */
+    ReferenceCounted touch();
+
     /**
      * Decreases the reference count by {@code 1} and deallocates this object if the reference count reaches at
      * {@code 0}.

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

@@ -111,11 +111,7 @@ public final class SctpMessage extends DefaultByteBufHolder {
             return false;
         }
 
-        if (!content().equals(sctpFrame.content())) {
-            return false;
-        }
-
-        return true;
+        return content().equals(sctpFrame.content());
     }
 
     @Override
@@ -156,6 +152,12 @@ public final class SctpMessage extends DefaultByteBufHolder {
         return this;
     }
 
+    @Override
+    public SctpMessage touch() {
+        super.touch();
+        return this;
+    }
+
     @Override
     public String toString() {
         if (refCnt() == 0) {

transport-udt/src/main/java/io/netty/channel/udt/UdtMessage.java

@@ -52,4 +52,10 @@ public final class UdtMessage extends DefaultByteBufHolder {
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public UdtMessage touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -102,6 +102,12 @@ public class DefaultAddressedEnvelope<M, A extends SocketAddress> implements Add
         return ReferenceCountUtil.release(message, decrement);
     }
 
+    @Override
+    public AddressedEnvelope<M, A> touch() {
+        ReferenceCountUtil.touch(message);
+        return this;
+    }
+
     @Override
     public String toString() {
         if (sender != null) {

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

@@ -104,4 +104,21 @@ public class DefaultFileRegion extends AbstractReferenceCounted implements FileR
             }
         }
     }
+
+    @Override
+    public FileRegion retain() {
+        super.retain();
+        return this;
+    }
+
+    @Override
+    public FileRegion retain(int increment) {
+        super.retain(increment);
+        return this;
+    }
+
+    @Override
+    public FileRegion touch() {
+        return this;
+    }
 }

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

@@ -80,4 +80,13 @@ public interface FileRegion extends ReferenceCounted {
      *                  byte of the region transferred.
      */
     long transferTo(WritableByteChannel target, long position) throws IOException;
+
+    @Override
+    FileRegion retain();
+
+    @Override
+    FileRegion retain(int increment);
+
+    @Override
+    FileRegion touch();
 }

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

@@ -63,4 +63,10 @@ public final class DatagramPacket
         super.retain(increment);
         return this;
     }
+
+    @Override
+    public DatagramPacket touch() {
+        super.touch();
+        return this;
+    }
 }

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

@@ -105,6 +105,11 @@ public class DefaultChannelPipelineTest {
             protected void deallocate() {
                 free.countDown();
             }
+
+            @Override
+            public ReferenceCounted touch() {
+                return this;
+            }
         };
 
         StringInboundHandler handler = new StringInboundHandler();