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.udt.echo.bytes.ByteEchoClientHandler extends io.netty.channel.SimpleChannelInboundHandler<io.netty.buffer.ByteBuf>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.example.udt.echo.bytes.ByteEchoClientHandler
  super_class: io.netty.channel.SimpleChannelInboundHandler
{
  private final io.netty.buffer.ByteBuf message;
    descriptor: Lio/netty/buffer/ByteBuf;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
         0: .line 34
            aload 0 /* this */
            iconst_0
            invokespecial io.netty.channel.SimpleChannelInboundHandler.<init>:(Z)V
         1: .line 36
            aload 0 /* this */
            getstatic io.netty.example.udt.echo.bytes.ByteEchoClient.SIZE:I
            invokestatic io.netty.buffer.Unpooled.buffer:(I)Lio/netty/buffer/ByteBuf;
            putfield io.netty.example.udt.echo.bytes.ByteEchoClientHandler.message:Lio/netty/buffer/ByteBuf;
         2: .line 37
            iconst_0
            istore 1 /* i */
        start local 1 // int i
         3: goto 6
         4: .line 38
      StackMap locals: io.netty.example.udt.echo.bytes.ByteEchoClientHandler int
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.example.udt.echo.bytes.ByteEchoClientHandler.message:Lio/netty/buffer/ByteBuf;
            iload 1 /* i */
            i2b
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
         5: .line 37
            iinc 1 /* i */ 1
      StackMap locals:
      StackMap stack:
         6: iload 1 /* i */
            aload 0 /* this */
            getfield io.netty.example.udt.echo.bytes.ByteEchoClientHandler.message:Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.capacity:()I
            if_icmplt 4
        end local 1 // int i
         7: .line 40
            return
        end local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lio/netty/example/udt/echo/bytes/ByteEchoClientHandler;
            3    7     1     i  I

  public void channelActive(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 44
            getstatic java.lang.System.err:Ljava/io/PrintStream;
            new java.lang.StringBuilder
            dup
            ldc "ECHO active "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.channel:()Lio/netty/channel/Channel;
            invokestatic io.netty.channel.udt.nio.NioUdtProvider.socketUDT:(Lio/netty/channel/Channel;)Lcom/barchart/udt/SocketUDT;
            invokevirtual com.barchart.udt.SocketUDT.toStringOptions:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokevirtual java.io.PrintStream.println:(Ljava/lang/String;)V
         1: .line 45
            aload 1 /* ctx */
            aload 0 /* this */
            getfield io.netty.example.udt.echo.bytes.ByteEchoClientHandler.message:Lio/netty/buffer/ByteBuf;
            invokeinterface io.netty.channel.ChannelHandlerContext.writeAndFlush:(Ljava/lang/Object;)Lio/netty/channel/ChannelFuture;
            pop
         2: .line 46
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/netty/example/udt/echo/bytes/ByteEchoClientHandler;
            0    3     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    MethodParameters:
      Name  Flags
      ctx   final

  public void channelRead0(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.buffer.ByteBuf msg
         0: .line 50
            aload 1 /* ctx */
            aload 2 /* msg */
            invokeinterface io.netty.channel.ChannelHandlerContext.write:(Ljava/lang/Object;)Lio/netty/channel/ChannelFuture;
            pop
         1: .line 51
            return
        end local 2 // io.netty.buffer.ByteBuf msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/example/udt/echo/bytes/ByteEchoClientHandler;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2   msg  Lio/netty/buffer/ByteBuf;
    MethodParameters:
      Name  Flags
      ctx   
      msg   

  public void channelReadComplete(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.udt.echo.bytes.ByteEchoClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 55
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.flush:()Lio/netty/channel/ChannelHandlerContext;
            pop
         1: .line 56
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/example/udt/echo/bytes/ByteEchoClientHandler;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    MethodParameters:
      Name  Flags
      ctx   

  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.udt.echo.bytes.ByteEchoClientHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Throwable cause
         0: .line 60
            aload 2 /* cause */
            invokevirtual java.lang.Throwable.printStackTrace:()V
         1: .line 61
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.close:()Lio/netty/channel/ChannelFuture;
            pop
         2: .line 62
            return
        end local 2 // java.lang.Throwable cause
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.example.udt.echo.bytes.ByteEchoClientHandler this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lio/netty/example/udt/echo/bytes/ByteEchoClientHandler;
            0    3     1    ctx  Lio/netty/channel/ChannelHandlerContext;
            0    3     2  cause  Ljava/lang/Throwable;
    MethodParameters:
       Name  Flags
      ctx    final
      cause  final

  public void channelRead0(io.netty.channel.ChannelHandlerContext, java.lang.Object);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            aload 2
            checkcast io.netty.buffer.ByteBuf
            invokevirtual io.netty.example.udt.echo.bytes.ByteEchoClientHandler.channelRead0:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws java.lang.Exception
}
Signature: Lio/netty/channel/SimpleChannelInboundHandler<Lio/netty/buffer/ByteBuf;>;
SourceFile: "ByteEchoClientHandler.java"