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.example.discard.DiscardClientHandler extends io.netty.channel.SimpleChannelInboundHandler<java.lang.Object>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.example.discard.DiscardClientHandler
  super_class: io.netty.channel.SimpleChannelInboundHandler
{
  private io.netty.buffer.ByteBuf content;
    descriptor: Lio/netty/buffer/ByteBuf;
    flags: (0x0002) ACC_PRIVATE

  private io.netty.channel.ChannelHandlerContext ctx;
    descriptor: Lio/netty/channel/ChannelHandlerContext;
    flags: (0x0002) ACC_PRIVATE

  long counter;
    descriptor: J
    flags: (0x0000) 

  private final io.netty.channel.ChannelFutureListener trafficGenerator;
    descriptor: Lio/netty/channel/ChannelFutureListener;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // io.netty.example.discard.DiscardClientHandler this
         0: .line 27
            aload 0 /* this */
            invokespecial io.netty.channel.SimpleChannelInboundHandler.<init>:()V
         1: .line 68
            aload 0 /* this */
            new io.netty.example.discard.DiscardClientHandler$1
            dup
            aload 0 /* this */
            invokespecial io.netty.example.discard.DiscardClientHandler$1.<init>:(Lio/netty/example/discard/DiscardClientHandler;)V
            putfield io.netty.example.discard.DiscardClientHandler.trafficGenerator:Lio/netty/channel/ChannelFutureListener;
         2: .line 27
            return
        end local 0 // io.netty.example.discard.DiscardClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/netty/example/discard/DiscardClientHandler;

  public void channelActive(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.example.discard.DiscardClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 34
            aload 0 /* this */
            aload 1 /* ctx */
            putfield io.netty.example.discard.DiscardClientHandler.ctx:Lio/netty/channel/ChannelHandlerContext;
         1: .line 37
            aload 0 /* this */
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.alloc:()Lio/netty/buffer/ByteBufAllocator;
            getstatic io.netty.example.discard.DiscardClient.SIZE:I
            invokeinterface io.netty.buffer.ByteBufAllocator.directBuffer:(I)Lio/netty/buffer/ByteBuf;
            getstatic io.netty.example.discard.DiscardClient.SIZE:I
            invokevirtual io.netty.buffer.ByteBuf.writeZero:(I)Lio/netty/buffer/ByteBuf;
            putfield io.netty.example.discard.DiscardClientHandler.content:Lio/netty/buffer/ByteBuf;
         2: .line 40
            aload 0 /* this */
            invokevirtual io.netty.example.discard.DiscardClientHandler.generateTraffic:()V
         3: .line 41
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.discard.DiscardClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lio/netty/example/discard/DiscardClientHandler;
            0    4     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    MethodParameters:
      Name  Flags
      ctx   

  public void channelInactive(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.example.discard.DiscardClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 45
            aload 0 /* this */
            getfield io.netty.example.discard.DiscardClientHandler.content:Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.release:()Z
            pop
         1: .line 46
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.discard.DiscardClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/example/discard/DiscardClientHandler;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    MethodParameters:
      Name  Flags
      ctx   

  public void channelRead0(io.netty.channel.ChannelHandlerContext, java.lang.Object);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=3, args_size=3
        start local 0 // io.netty.example.discard.DiscardClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Object msg
         0: .line 51
            return
        end local 2 // java.lang.Object msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.discard.DiscardClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/example/discard/DiscardClientHandler;
            0    1     1   ctx  Lio/netty/channel/ChannelHandlerContext;
            0    1     2   msg  Ljava/lang/Object;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   
      msg   

  public void exceptionCaught(io.netty.channel.ChannelHandlerContext, java.lang.Throwable);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Throwable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=3, args_size=3
        start local 0 // io.netty.example.discard.DiscardClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Throwable cause
         0: .line 56
            aload 2 /* cause */
            invokevirtual java.lang.Throwable.printStackTrace:()V
         1: .line 57
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.close:()Lio/netty/channel/ChannelFuture;
            pop
         2: .line 58
            return
        end local 2 // java.lang.Throwable cause
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.discard.DiscardClientHandler this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lio/netty/example/discard/DiscardClientHandler;
            0    3     1    ctx  Lio/netty/channel/ChannelHandlerContext;
            0    3     2  cause  Ljava/lang/Throwable;
    MethodParameters:
       Name  Flags
      ctx    
      cause  

  private void generateTraffic();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.example.discard.DiscardClientHandler this
         0: .line 65
            aload 0 /* this */
            getfield io.netty.example.discard.DiscardClientHandler.ctx:Lio/netty/channel/ChannelHandlerContext;
            aload 0 /* this */
            getfield io.netty.example.discard.DiscardClientHandler.content:Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.retainedDuplicate:()Lio/netty/buffer/ByteBuf;
            invokeinterface io.netty.channel.ChannelHandlerContext.writeAndFlush:(Ljava/lang/Object;)Lio/netty/channel/ChannelFuture;
            aload 0 /* this */
            getfield io.netty.example.discard.DiscardClientHandler.trafficGenerator:Lio/netty/channel/ChannelFutureListener;
            invokeinterface io.netty.channel.ChannelFuture.addListener:(Lio/netty/util/concurrent/GenericFutureListener;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 66
            return
        end local 0 // io.netty.example.discard.DiscardClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/example/discard/DiscardClientHandler;
}
Signature: Lio/netty/channel/SimpleChannelInboundHandler<Ljava/lang/Object;>;
SourceFile: "DiscardClientHandler.java"
NestMembers:
  io.netty.example.discard.DiscardClientHandler$1
InnerClasses:
  io.netty.example.discard.DiscardClientHandler$1