NETTY

https://segmentfault.com/a/1190000007282628
https://dirtysalt.github.io/html/netty.html
https://github.com/code4craft/netty-learning
https://www.infoq.com/cn/articles/netty-high-performance
http://xw-z1985.iteye.com/blog/1918052

1. EventLoopGroup sg = new NioEventLoopGroup();
  1. MultithreadEventExecutorGroup //its a ScheduleExecutorService(8, null, DefaultEventExecutorChooserFactory, KQueueSelectorProvider, DefaultSelectStrategyFactory, RejectedExecutionHandler]);
2. EventLoopGroup childrenGroup = new NioEventLoopGroup();
3. ServerBootstrap bootstrap = new ServerBootstrap();
4. bootstrap.group(serverGroup, childGroup);
5. .channel(NioServerSocketChannel.class);
6. .childHandler(new ChannelInitialize<SocketChannel>();
7. ChannelFuture f = bootstrap.bind(port).sync();
  7.1 doBind: ChannelFuture regFuture=config().group().register(channel);
      next().register(channel);
        doStartThread()
        runAllTasks(long timeoutNanos)