class NioEventLoop extends SingleThreadEventLoop {

    void cancel(SelectionKey key) {
        key.cancel();
        cancelledKeys ++;
        if (cancelledKeys >= CLEANUP_INTERVAL) {
            cancelledKeys = 0;
            needsToSelectAgain = true;
        }
    }

      NioEventLoop(NioEventLoopGroup parent, Executor executor, SelectorProvider selectorProvider,
                 SelectStrategy strategy, RejectedExecutionHandler rejectedExecutionHandler);

}