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.AbstractChannelHandlerContext$13 implements java.lang.Runnable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: io.netty.channel.AbstractChannelHandlerContext$13
  super_class: java.lang.Object
{
  final io.netty.channel.AbstractChannelHandlerContext this$0;
    descriptor: Lio/netty/channel/AbstractChannelHandlerContext;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final io.netty.channel.AbstractChannelHandlerContext val$next;
    descriptor: Lio/netty/channel/AbstractChannelHandlerContext;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final io.netty.channel.ChannelPromise val$promise;
    descriptor: Lio/netty/channel/ChannelPromise;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(io.netty.channel.AbstractChannelHandlerContext, io.netty.channel.AbstractChannelHandlerContext, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/AbstractChannelHandlerContext;Lio/netty/channel/AbstractChannelHandlerContext;Lio/netty/channel/ChannelPromise;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // io.netty.channel.AbstractChannelHandlerContext$13 this
         0: .line 610
            aload 0 /* this */
            aload 1
            putfield io.netty.channel.AbstractChannelHandlerContext$13.this$0:Lio/netty/channel/AbstractChannelHandlerContext;
            aload 0 /* this */
            aload 2
            putfield io.netty.channel.AbstractChannelHandlerContext$13.val$next:Lio/netty/channel/AbstractChannelHandlerContext;
            aload 0 /* this */
            aload 3
            putfield io.netty.channel.AbstractChannelHandlerContext$13.val$promise:Lio/netty/channel/ChannelPromise;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.netty.channel.AbstractChannelHandlerContext$13 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/channel/AbstractChannelHandlerContext$13;
    MethodParameters:
             Name  Flags
      this$0       final
      val$next     final
      val$promise  final

  public void run();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.channel.AbstractChannelHandlerContext$13 this
         0: .line 613
            aload 0 /* this */
            getfield io.netty.channel.AbstractChannelHandlerContext$13.val$next:Lio/netty/channel/AbstractChannelHandlerContext;
            aload 0 /* this */
            getfield io.netty.channel.AbstractChannelHandlerContext$13.val$promise:Lio/netty/channel/ChannelPromise;
            invokevirtual io.netty.channel.AbstractChannelHandlerContext.invokeClose:(Lio/netty/channel/ChannelPromise;)V
         1: .line 614
            return
        end local 0 // io.netty.channel.AbstractChannelHandlerContext$13 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/channel/AbstractChannelHandlerContext$13;
}
SourceFile: "AbstractChannelHandlerContext.java"
EnclosingMethod: io.netty.channel.AbstractChannelHandlerContext.close:(Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
NestHost: io.netty.channel.AbstractChannelHandlerContext
InnerClasses:
  io.netty.channel.AbstractChannelHandlerContext$13