Examples of com.hazelcast.core.ILock

com.hazelcast.core.ILock
Distributed implementation of {@link Lock}. @see Lock

    public void testContendedLockUnlockWithVeryShortAwait() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();


        String lockName = randomString();
        String conditionName = randomString();
        final ILock lock = instance.getLock(lockName);
        final ICondition condition = lock.newCondition(conditionName);


        final AtomicBoolean running = new AtomicBoolean(true);
        final AtomicReference<Exception> errorRef = new AtomicReference<Exception>();
        final int numberOfThreads = 8;
        final CountDownLatch finalLatch = new CountDownLatch(numberOfThreads);
        ExecutorService ex = Executors.newCachedThreadPool();


        for (int i = 0; i < numberOfThreads; i++) {
            ex.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        while (running.get()) {
                            lock.lock();
                            try {
                                condition.await(1, TimeUnit.MILLISECONDS);
                            } catch (InterruptedException ignored) {
                            } catch (IllegalStateException e) {
                                errorRef.set(e);
                                running.set(false);
                            } finally {
                                lock.unlock();
                            }
                        }
                    } finally {
                        finalLatch.countDown();
                    }

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        // the system should wait at most 5000 ms in order to determine the operation status
        config.setProperty(GroupProperties.PROP_OPERATION_CALL_TIMEOUT_MILLIS, "5000");


        HazelcastInstance instance = createHazelcastInstance(config);


        final ILock lock = instance.getLock(randomString());
        final ICondition condition0 = lock.newCondition(randomString());


        final CountDownLatch latch = new CountDownLatch(1);


        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    lock.lock();
                    condition0.await();
                } catch (InterruptedException e) {
                    latch.countDown();
                }
            }

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    //if there are multiple waiters, then only 1 waiter should be notified.
    @Test(timeout = 60000)
    public void testSignalWithMultipleWaiters() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();


        ILock lock = instance.getLock(randomString());
        final ICondition condition = lock.newCondition(randomString());


        final CountDownLatch latch = new CountDownLatch(10);
        final CountDownLatch syncLatch = new CountDownLatch(3);


        createThreadWaitsForCondition(latch, lock, condition, syncLatch).start();
        createThreadWaitsForCondition(latch, lock, condition, syncLatch).start();
        createThreadWaitsForCondition(latch, lock, condition, syncLatch).start();


        syncLatch.await();


        lock.lock();
        condition.signal();
        lock.unlock();


        assertTrueDelayed5sec(new AssertTask() {
            @Override
            public void run() throws Exception {
                assertEquals(9, latch.getCount());
            }
        });


        assertEquals(false, lock.isLocked());
    }

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    //receive this signal
    @Test(timeout = 60000)
    public void testSignalIsNotStored() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();


        final ILock lock = instance.getLock(randomString());
        final ICondition condition = lock.newCondition(randomString());


        final CountDownLatch latch = new CountDownLatch(1);


        lock.lock();
        condition.signal();
        lock.unlock();


        createThreadWaitsForCondition(latch, lock, condition, null).start();
        // if the thread is still waiting, then the signal is not stored.
        assertFalse(latch.await(3000, TimeUnit.MILLISECONDS));
    }

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    }


    @Test(timeout = 60000, expected = IllegalMonitorStateException.class)
    public void testAwaitOnConditionOfFreeLock() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();
        ILock lock = instance.getLock(randomString());
        ICondition condition = lock.newCondition("condition");
        condition.await();
    }

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    }


    @Test(timeout = 60000, expected = IllegalMonitorStateException.class)
    public void testSignalOnConditionOfFreeLock() {
        HazelcastInstance instance = createHazelcastInstance();
        ILock lock = instance.getLock(randomString());
        ICondition condition = lock.newCondition("condition");
        condition.signal();
    }

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    @Test(timeout = 60000, expected = IllegalMonitorStateException.class)
    public void testAwait_whenOwnedByOtherThread() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();


        final ILock lock = instance.getLock(randomString());
        final ICondition condition = lock.newCondition(randomString());


        final CountDownLatch latch = new CountDownLatch(1);


        new TestThread(){
            @Override
            public void doRun() {
                lock.lock();
                latch.countDown();
            }
        }.start();


        latch.await();

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    @Test(timeout = 60000, expected = IllegalMonitorStateException.class)
    public void testSignal_whenOwnedByOtherThread() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();


        final ILock lock = instance.getLock(randomString());
        final ICondition condition = lock.newCondition(randomString());


        final CountDownLatch latch = new CountDownLatch(1);


        new Thread(new Runnable() {
            @Override
            public void run() {
                lock.lock();
                latch.countDown();
            }
        }).start();


        latch.await();

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    @Test(timeout = 60000)
    public void testAwaitTimeout_whenFail() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();


        final ILock lock = instance.getLock(randomString());
        final ICondition condition = lock.newCondition(randomString());


        lock.lock();


        assertFalse(condition.await(1, TimeUnit.MILLISECONDS));
    }

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    @Test(timeout = 60000)
    public void testAwaitTimeout_whenSuccess() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();


        final ILock lock = instance.getLock(randomString());
        final ICondition condition = lock.newCondition(randomString());
        final CountDownLatch latch = new CountDownLatch(1);


        new Thread(new Runnable() {
            @Override
            public void run() {
                lock.lock();
                try {
                    if (condition.await(10, TimeUnit.SECONDS)) {
                        latch.countDown();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();


        sleepSeconds(1);
        lock.lock();
        condition.signal();
        lock.unlock();
    }

View Full Code Here

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