NioEventLoop每个eventLoop会维护一个selector和taskQueue，负责处理客户端请求和内部任务，如ServerSocketChannel注册和ServerSocket绑定等。
NioEventLoop
继承关系如下：
NioEventLoop
构造方法：
[url=] [/url]
NioEventLoop(NioEventLoopGroup parent, ThreadFactory threadFactory, SelectorProvider selectorProvider) { super(parent, threadFactory, false); if (selectorProvider == null) { throw new NullPointerException("selectorProvider"); } provider = selectorProvider; selector = openSelector(); }[url=][/url]
当看到 selector = openSelector() 时，有没有觉得亲切了许多，这里先不管 selector，看看SingleThreadEventLoop类。
SingleThreadEventLoop 构造方法：
protected SingleThreadEventLoop(EventLoopGroup parent, ThreadFactory threadFactory, boolean addTaskWakesUp) { super(parent, threadFactory, addTaskWakesUp);}
啥事都没做... |
