netty 详解

• ServerBootstrap.bind(new InetSocketAddress(port)) 服务端绑定端口
  NioEventLoopGroup bossGroup = new NioEventLoopGroup(1); – Acceptor监听客户端的线程池
  NioEventLoopGroup workerGroup = new NioEventLoopGroup(2); – 处理io的线程池
  1) 初始化并注册Channel
  主要是根据bootstrap.channel(NioServerSocketChannel.class);来决定

  ChannelFuture initAndRegister() {
      //1.生成Channel实例
      Channel channel = NioServerSocketChannel.class.newInStance();
      //2. 注册ServerBootstrapAcceptor
      ChannelPipeline p = channel.pipeline();   
      p.addLast(new ChannelInitializer() {
           public void initChannel(Channel ch) throws Exception {
               ch.pipeline().addLast(new ServerBootstrapAcceptor(
                        childGroup, childHandler, childOptions, childAttrs));
           }
      });  
      //3. 将这个channel注册到bossGroup 里
      ChannelFuture regFuture = bossGroup.register(channel); 

  } 

 小注：

    NioEventLoopGroup ... {
        private final EventExecutor[] children ;
        AtomicInteger childIndex = new AtomicInteger();
        NioEventLoopGroup(int size) {
             children  = new EventExecutor[size];
             for (int i = 0; i < nThreads; i ++) {
                children[i] = new NioEventLoop(this, threadFactory...);
             }
        }
        public EventExecutor next() {
            return children[childIndex.getAndIncrement() & children.length - 1];
        }
        public ChannelFuture register(Channel channel) {
            return next().register(channel);
        }
    }

http://ifeve.com/paper-set/