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.ChannelHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.netty.channel.ChannelHandler
  super_class: java.lang.Object
{
  public abstract void handlerAdded(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public abstract void handlerRemoved(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public abstract void exceptionCaught(io.netty.channel.ChannelHandlerContext, java.lang.Throwable);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Throwable;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
       Name  Flags
      ctx    
      cause  
}
SourceFile: "ChannelHandler.java"
NestMembers:
  io.netty.channel.ChannelHandler$Sharable
InnerClasses:
  public abstract Sharable = io.netty.channel.ChannelHandler$Sharable of io.netty.channel.ChannelHandler