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

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


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


    public void run() {
        thread = Thread.currentThread();

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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();
                }


                cancelledKeys = 0;
                processRegisterTaskQueue();
                processWriteTaskQueue();

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            if (!(channel instanceof NioAcceptedSocketChannel) ||
                ((NioAcceptedSocketChannel) channel).bossThread != currentThread) {
                final Selector workerSelector = selector;
                if (workerSelector != null) {
                    if (wakenUp.compareAndSet(false, true)) {
                        workerSelector.wakeup();
                    }
                }
            } else {
                // A write request can be made from an acceptor thread (boss)
                // when a user attempted to write something in:

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

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

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


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


    /**
     * Selector loop.

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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();
                }


                cancelledKeys = 0;
                processRegisterTaskQueue();
                processWriteTaskQueue();

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            }


            final Selector selector = this.selector;
            if (selector != null) {
                if (wakenUp.compareAndSet(false, true)) {
                    selector.wakeup();
                }
            }
            return true;
        }

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                        // If the worker thread (the one that that might possibly be blocked
                        // in a select() call) is not the thread executing this method wakeup
                        // the select() operation.
                        if (Thread.currentThread() != thread &&
                                wakenUp.compareAndSet(false, true)) {
                            selector.wakeup();
                        }
                        changed = true;
                    }
                    break;
                case 1:

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                            // Going to set the interestOps from a different thread
                            // and some old provides will need synchronization.
                            selectorGuard.readLock().lock();
                            try {
                                if (wakenUp.compareAndSet(false, true)) {
                                    selector.wakeup();
                                }
                                key.interestOps(interestOps);
                                changed = true;
                            } finally {
                                selectorGuard.readLock().unlock();

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