左程云大厂算法和数据结构刷题班

  EventLoopGroup newEventLoopGroup = new NioEventLoopGroup(workerCount,                    threadFactory(this, "nio"));            if (!serverLoops.compareAndSet(null, newEventLoopGroup)) {                //"FutureReturnValueIgnored" this is deliberate                newEventLoopGroup.shutdownGracefully(0, 0, TimeUnit.MILLISECONDS);            }