【Netty源码分析】ChannelPipeline（二）

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();