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.channel.EventLoopGroup extends io.netty.util.concurrent.EventExecutorGroup
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.netty.channel.EventLoopGroup
  super_class: java.lang.Object
{
  public abstract io.netty.channel.EventLoop next();
    descriptor: ()Lio/netty/channel/EventLoop;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract io.netty.channel.ChannelFuture register(io.netty.channel.Channel);
    descriptor: (Lio/netty/channel/Channel;)Lio/netty/channel/ChannelFuture;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      channel  

  public abstract io.netty.channel.ChannelFuture register(io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      promise  

  public abstract io.netty.channel.ChannelFuture register(io.netty.channel.Channel, io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/Channel;Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
         Name  Flags
      channel  
      promise  

  public io.netty.util.concurrent.EventExecutor next();
    descriptor: ()Lio/netty/util/concurrent/EventExecutor;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokeinterface io.netty.channel.EventLoopGroup.next:()Lio/netty/channel/EventLoop;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "EventLoopGroup.java"