netty源碼-server端綁定端口流程

僅用於記錄在分析netty源碼的日志

源碼調用關系圖

Netty Server示例

        EventLoopGroup boss = new NioEventLoopGroup(1);
        EventLoopGroup io = new NioEventLoopGroup();
        ServerBootstrap bootstrap = new ServerBootstrap();
        bootstrap.group(boss, io);
        bootstrap.channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<NioSocketChannel>() {
            @Override
            protected void initChannel(NioSocketChannel ch) throws Exception {

            }
        });
        bootstrap.bind(25001).sync().addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (future.isSuccess()) {
                    System.out.println("啟動成功");
                } else {
                    future.cause().printStackTrace();
                }
            }
        });

代碼執行到bootstrap.bind(25001)時，netty內部的綁定端口如下：

1. AbstractBootstrap --> bind() --> doBind() --> doBind0()
2. NioServerSocketChannel的bind方法在父類AbstractChannel類，所以channel的調用關系：AbstractChannel --> bind()
3. DefaultChannelPipeline --> bind()
4. AbstractChannelHandlerContext --> bind()
5. HeadContext --> bind()
6. AbstractChannel.AbstractUnsafe --> bind(),然后調用AbstractChannel --> doBind(),而他的實現類看下一步
7. NioServerSocketChannel --> doBind()