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 interface io.netty.util.concurrent.FutureListener<V> extends io.netty.util.concurrent.GenericFutureListener<io.netty.util.concurrent.Future<V>>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.netty.util.concurrent.FutureListener
  super_class: java.lang.Object
{
}
Signature: <V:Ljava/lang/Object;>Ljava/lang/Object;Lio/netty/util/concurrent/GenericFutureListener<Lio/netty/util/concurrent/Future<TV;>;>;
SourceFile: "FutureListener.java"