在上一篇博客【Netty源码学习】ChannelPipeline（一）中我们只是大体介绍了ChannelPipeline相关的知识，其实介绍的并不详细，接下来我们详细介绍一下ChannelPipeline及其实现类。

1、ChannelPipeline的结构图：

这张ChannelPipeline的结构图我们应该是看到过的，其实在ChannelPipeline接口中只是覆盖了ChannelInboundInvoker和ChannelOutboundInvoker两个接口的方法。上一篇文章中我们了解到DefaultChannelPipeline其实是ChannelHandlerContext的双向链表，因此接口ChannelPipeline中定义的抽象方法很多部分是有关ChannelHanderContext添加到双向链表中的操作的。

ChannelPipeline addFirst(String name, ChannelHandler handler);
ChannelPipeline addFirst(EventExecutorGroup group, String name, ChannelHandler handler);
    ChannelPipeline addLast(String name, ChannelHandler handler);
    ChannelPipeline addLast(EventExecutorGroup group, String name, ChannelHandler handler);
    ChannelPipeline addBefore(String baseName, String name, ChannelHandler handler);
    ChannelPipeline addBefore(EventExecutorGroup group, String baseName, String name, ChannelHandler handler);
    ChannelPipeline addAfter(String baseName, String name, ChannelHandler handler);
    ChannelPipeline addAfter(EventExecutorGroup group, String baseName, String name, ChannelHandler handler);
    ChannelPipeline addFirst(ChannelHandler... handlers);
    ChannelPipeline addFirst(EventExecutorGroup group, ChannelHandler... handlers);
    ChannelPipeline addLast(ChannelHandler... handlers);
    ChannelPipeline addLast(EventExecutorGroup group, ChannelHandler... handlers);
    ChannelPipeline remove(ChannelHandler handler);
    ChannelHandler remove(String name);
    <T extends ChannelHandler> T remove(Class<T> handlerType);
    ChannelHandler removeFirst();
    ChannelHandler removeLast();
    ChannelPipeline replace(ChannelHandler oldHandler, String newName, ChannelHandler newHandler);
    ChannelHandler replace(String oldName, String newName, ChannelHandler newHandler);
    <T extends ChannelHandler> T replace(Class<T> oldHandlerType, String newName,
    ChannelHandler first();
    ChannelHandlerContext firstContext();
    ChannelHandler last();
    ChannelHandlerContext lastContext();
    ChannelHandler get(String name);
    <T extends ChannelHandler> T get(Class<T> handlerType);
    ChannelHandlerContext context(ChannelHandler handler);
    ChannelHandlerContext context(String name);
    ChannelHandlerContext context(Class<? extends ChannelHandler> handlerType);
    Channel channel();
    List<String> names();
    Map<String, ChannelHandler> toMap();

ChannelPipeline接口中其他的抽象方法就是覆盖的ChannelInboundInvoker和ChannelOutboundInvoker两个接口的方法了

    @Override
    ChannelPipeline fireChannelRegistered();
     @Override
    ChannelPipeline fireChannelUnregistered();
    @Override
    ChannelPipeline fireChannelActive();
    @Override
    ChannelPipeline fireChannelInactive();
    @Override
    ChannelPipeline fireExceptionCaught(Throwable cause);
    @Override
    ChannelPipeline fireUserEventTriggered(Object event);
    @Override
    ChannelPipeline fireChannelRead(Object msg);
    @Override
    ChannelPipeline fireChannelReadComplete();
    @Override
    ChannelPipeline fireChannelWritabilityChanged();
    @Override
    ChannelPipeline flush();