http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
public class io.netty.channel.ChannelDuplexHandler extends io.netty.channel.ChannelInboundHandlerAdapter implements io.netty.channel.ChannelOutboundHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.channel.ChannelDuplexHandler
  super_class: io.netty.channel.ChannelInboundHandlerAdapter
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.channel.ChannelDuplexHandler this
         0: .line 27
            aload 0 /* this */
            invokespecial io.netty.channel.ChannelInboundHandlerAdapter.<init>:()V
            return
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/channel/ChannelDuplexHandler;

  public void bind(io.netty.channel.ChannelHandlerContext, java.net.SocketAddress, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/net/SocketAddress;Lio/netty/channel/ChannelPromise;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.net.SocketAddress localAddress
        start local 3 // io.netty.channel.ChannelPromise promise
         0: .line 38
            aload 1 /* ctx */
            aload 2 /* localAddress */
            aload 3 /* promise */
            invokeinterface io.netty.channel.ChannelHandlerContext.bind:(Ljava/net/SocketAddress;Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 39
            return
        end local 3 // io.netty.channel.ChannelPromise promise
        end local 2 // java.net.SocketAddress localAddress
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    2     0          this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1           ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2  localAddress  Ljava/net/SocketAddress;
            0    2     3       promise  Lio/netty/channel/ChannelPromise;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
              Name  Flags
      ctx           
      localAddress  
      promise       

  public void connect(io.netty.channel.ChannelHandlerContext, java.net.SocketAddress, java.net.SocketAddress, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/net/SocketAddress;Ljava/net/SocketAddress;Lio/netty/channel/ChannelPromise;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=5, args_size=5
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.net.SocketAddress remoteAddress
        start local 3 // java.net.SocketAddress localAddress
        start local 4 // io.netty.channel.ChannelPromise promise
         0: .line 50
            aload 1 /* ctx */
            aload 2 /* remoteAddress */
            aload 3 /* localAddress */
            aload 4 /* promise */
            invokeinterface io.netty.channel.ChannelHandlerContext.connect:(Ljava/net/SocketAddress;Ljava/net/SocketAddress;Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 51
            return
        end local 4 // io.netty.channel.ChannelPromise promise
        end local 3 // java.net.SocketAddress localAddress
        end local 2 // java.net.SocketAddress remoteAddress
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    2     0           this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1            ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2  remoteAddress  Ljava/net/SocketAddress;
            0    2     3   localAddress  Ljava/net/SocketAddress;
            0    2     4        promise  Lio/netty/channel/ChannelPromise;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
               Name  Flags
      ctx            
      remoteAddress  
      localAddress   
      promise        

  public void disconnect(io.netty.channel.ChannelHandlerContext, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/channel/ChannelPromise;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.channel.ChannelPromise promise
         0: .line 62
            aload 1 /* ctx */
            aload 2 /* promise */
            invokeinterface io.netty.channel.ChannelHandlerContext.disconnect:(Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 63
            return
        end local 2 // io.netty.channel.ChannelPromise promise
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2  promise  Lio/netty/channel/ChannelPromise;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      ctx      
      promise  

  public void close(io.netty.channel.ChannelHandlerContext, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/channel/ChannelPromise;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.channel.ChannelPromise promise
         0: .line 73
            aload 1 /* ctx */
            aload 2 /* promise */
            invokeinterface io.netty.channel.ChannelHandlerContext.close:(Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 74
            return
        end local 2 // io.netty.channel.ChannelPromise promise
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2  promise  Lio/netty/channel/ChannelPromise;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      ctx      
      promise  

  public void deregister(io.netty.channel.ChannelHandlerContext, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/channel/ChannelPromise;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.channel.ChannelPromise promise
         0: .line 84
            aload 1 /* ctx */
            aload 2 /* promise */
            invokeinterface io.netty.channel.ChannelHandlerContext.deregister:(Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 85
            return
        end local 2 // io.netty.channel.ChannelPromise promise
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2  promise  Lio/netty/channel/ChannelPromise;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      ctx      
      promise  

  public void read(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 95
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.read:()Lio/netty/channel/ChannelHandlerContext;
            pop
         1: .line 96
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void write(io.netty.channel.ChannelHandlerContext, java.lang.Object, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;Lio/netty/channel/ChannelPromise;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Object msg
        start local 3 // io.netty.channel.ChannelPromise promise
         0: .line 106
            aload 1 /* ctx */
            aload 2 /* msg */
            aload 3 /* promise */
            invokeinterface io.netty.channel.ChannelHandlerContext.write:(Ljava/lang/Object;Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 107
            return
        end local 3 // io.netty.channel.ChannelPromise promise
        end local 2 // java.lang.Object msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2      msg  Ljava/lang/Object;
            0    2     3  promise  Lio/netty/channel/ChannelPromise;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      ctx      
      msg      
      promise  

  public void flush(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // io.netty.channel.ChannelDuplexHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 117
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.flush:()Lio/netty/channel/ChannelHandlerContext;
            pop
         1: .line 118
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.ChannelDuplexHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/channel/ChannelDuplexHandler;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   
}
SourceFile: "ChannelDuplexHandler.java"