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 abstract class io.netty.handler.codec.compression.ZlibEncoder extends io.netty.handler.codec.MessageToByteEncoder<io.netty.buffer.ByteBuf>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: io.netty.handler.codec.compression.ZlibEncoder
  super_class: io.netty.handler.codec.MessageToByteEncoder
{
  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.compression.ZlibEncoder this
         0: .line 29
            aload 0 /* this */
            iconst_0
            invokespecial io.netty.handler.codec.MessageToByteEncoder.<init>:(Z)V
         1: .line 30
            return
        end local 0 // io.netty.handler.codec.compression.ZlibEncoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/compression/ZlibEncoder;

  public abstract boolean isClosed();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract io.netty.channel.ChannelFuture close();
    descriptor: ()Lio/netty/channel/ChannelFuture;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract io.netty.channel.ChannelFuture close(io.netty.channel.ChannelPromise);
    descriptor: (Lio/netty/channel/ChannelPromise;)Lio/netty/channel/ChannelFuture;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      promise  
}
Signature: Lio/netty/handler/codec/MessageToByteEncoder<Lio/netty/buffer/ByteBuf;>;
SourceFile: "ZlibEncoder.java"