private static void handleSelection(SelectionKey key, int keyOps,
                                        HashMap<SelectionKey, Runnable> map,
                                        ExecutorService pool) {
        // 重点
        // 取消继续对keyOps的监听
        key.interestOps(key.readyOps() & ~keyOps);

        Runnable runnable = null;
        try {
            runnable = map.get(key);
        } catch (Exception ignored) {

        }

        if (runnable != null && !pool.isShutdown()) {
            // 异步调度
            pool.execute(runnable);
        }
    }