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) 
class io.netty.channel.ChannelFutureListener$1 implements io.netty.channel.ChannelFutureListener
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: io.netty.channel.ChannelFutureListener$1
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.channel.ChannelFutureListener$1 this
         0: .line 41
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.netty.channel.ChannelFutureListener$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/channel/ChannelFutureListener$1;

  public void operationComplete(io.netty.channel.ChannelFuture);
    descriptor: (Lio/netty/channel/ChannelFuture;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // io.netty.channel.ChannelFutureListener$1 this
        start local 1 // io.netty.channel.ChannelFuture future
         0: .line 44
            aload 1 /* future */
            invokeinterface io.netty.channel.ChannelFuture.channel:()Lio/netty/channel/Channel;
            invokeinterface io.netty.channel.Channel.close:()Lio/netty/channel/ChannelFuture;
            pop
         1: .line 45
            return
        end local 1 // io.netty.channel.ChannelFuture future
        end local 0 // io.netty.channel.ChannelFutureListener$1 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lio/netty/channel/ChannelFutureListener$1;
            0    2     1  future  Lio/netty/channel/ChannelFuture;
    MethodParameters:
        Name  Flags
      future  

  public void operationComplete(io.netty.util.concurrent.Future);
    descriptor: (Lio/netty/util/concurrent/Future;)V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast io.netty.channel.ChannelFuture
            invokevirtual io.netty.channel.ChannelFutureListener$1.operationComplete:(Lio/netty/channel/ChannelFuture;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws java.lang.Exception
}
SourceFile: "ChannelFutureListener.java"
EnclosingMethod: io.netty.channel.ChannelFutureListener
NestHost: io.netty.channel.ChannelFutureListener
InnerClasses:
  io.netty.channel.ChannelFutureListener$1