Examples of java.nio.channels.Selector.wakeup()

java.nio.channels.Selector.wakeup()
Causes the first selection operation that has not yet returned to return immediately.
If another thread is currently blocked in an invocation of the {@link #select()} or {@link #select(long)} methods then that invocationwill return immediately. If no selection operation is currently in progress then the next invocation of one of these methods will return immediately unless the {@link #selectNow()} method is invoked in themeantime. In any case the value returned by that invocation may be non-zero. Subsequent invocations of the {@link #select()} or {@link #select(long)} methods will block as usual unless this method is invokedagain in the meantime.
Invoking this method more than once between two successive selection operations has the same effect as invoking it just once.
@return This selector

                case 0:
                    if (channel.getInterestOps() != interestOps) {
                        key.interestOps(interestOps);
                        if (Thread.currentThread() != worker.thread &&
                            worker.wakenUp.compareAndSet(false, true)) {
                            selector.wakeup();
                        }
                        changed = true;
                    }
                    break;
                case 1:

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                            changed = true;
                        } else {
                            worker.selectorGuard.readLock().lock();
                            try {
                                if (worker.wakenUp.compareAndSet(false, true)) {
                                    selector.wakeup();
                                }
                                key.interestOps(interestOps);
                                changed = true;
                            } finally {
                                worker.selectorGuard.readLock().unlock();

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    public void flushSession(DatagramSessionImpl session) {
        scheduleFlush(session);
        Selector selector = this.selector;
        if (selector != null) {
            selector.wakeup();
        }
    }


    private void scheduleFlush(DatagramSessionImpl session) {
        flushingSessions.add(session);

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    public void updateTrafficMask(DatagramSessionImpl session) {
        scheduleTrafficControl(session);
        Selector selector = this.selector;
        if (selector != null) {
            selector.wakeup();
        }
    }


    private void scheduleTrafficControl(DatagramSessionImpl session) {
        trafficControllingSessions.add(session);

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    void flush(SocketSessionImpl session) {
        scheduleFlush(session);
        Selector selector = this.selector;
        if (selector != null) {
            selector.wakeup();
        }
    }


    void updateTrafficMask(SocketSessionImpl session) {
        scheduleTrafficControl(session);

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    void updateTrafficMask(SocketSessionImpl session) {
        scheduleTrafficControl(session);
        Selector selector = this.selector;
        if (selector != null) {
            selector.wakeup();
        }
    }


    private void scheduleRemove(SocketSessionImpl session) {
        removingSessions.add(session);

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    public void flushSession(DatagramSessionImpl session) {
        scheduleFlush(session);
        Selector selector = this.selector;
        if (selector != null) {
            selector.wakeup();
        }
    }


    public void closeSession(DatagramSessionImpl session) {
    }

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        try {
            if (channel.socket.isOpen()) {
                channel.socket.close();
                Selector selector = channel.selector;
                if (selector != null) {
                    selector.wakeup();
                }
            }


            // Make sure the boss thread is not running so that that the future
            // is notified after a new connection cannot be accepted anymore.

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                boolean offered = registerTaskQueue.offer(registerTask);
                assert offered;
            }


            if (wakenUp.compareAndSet(false, true)) {
                selector.wakeup();
            }
        }


        public void run() {
            boolean shutdown = false;

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                    // It is inefficient in that it wakes up the selector for both
                    // the first case (BAD - wake-up required) and the second case
                    // (OK - no wake-up required).


                    if (wakenUp.get()) {
                        selector.wakeup();
                    }


                    processRegisterTaskQueue();


                    if (selectedKeyCount > 0) {

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