Examples of com.hazelcast.core.ILock

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


    @Test(timeout = 60000)
    public void testTryLock_whenMultipleThreads() throws InterruptedException {
        HazelcastInstance instance = createHazelcastInstance();
        final AtomicInteger atomicInteger = new AtomicInteger(0);
        final ILock lock = instance.getLock("testSimpleUsage");


        lock.lock();


        Runnable tryLockRunnable = new Runnable() {
            public void run() {
                if (lock.tryLock()) {
                    atomicInteger.incrementAndGet();
                }
            }
        };


        Thread thread1 = new Thread(tryLockRunnable);
        thread1.start();
        thread1.join();
        assertEquals(0, atomicInteger.get());


        lock.unlock();
        Thread thread2 = new Thread(tryLockRunnable);
        thread2.start();
        thread2.join();


        assertEquals(1, atomicInteger.get());
        assertTrue(lock.isLocked());
        assertFalse(lock.isLockedByCurrentThread());
    }

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    }


    @Test(timeout = 60000)
    public void testLockUnlock() {
        HazelcastInstance instance = createHazelcastInstance();
        final ILock lock = instance.getLock(randomString());


        assertFalse(lock.isLocked());


        lock.lock();
        assertTrue(lock.isLocked());
        lock.unlock();


        assertFalse(lock.isLocked());
    }

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    }


    @Test(timeout = 60000)
    public void testTryLock() {
        HazelcastInstance instance = createHazelcastInstance();
        final ILock lock = instance.getLock(randomString());


        assertFalse(lock.isLocked());


        assertTrue(lock.tryLock());
        lock.unlock();
        assertFalse(lock.isLocked());
    }

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    }


    @Test(timeout = 60000, expected = DistributedObjectDestroyedException.class)
    public void testDestroyLockWhenOtherWaitingOnLock() throws InterruptedException {
        final HazelcastInstance instance = createHazelcastInstance();
        final ILock lock = instance.getLock("testLockDestroyWhenWaitingLock");
        Thread t = new Thread(new Runnable() {
            public void run() {
                lock.lock();
            }
        });
        t.start();
        t.join();


        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                lock.destroy();
            }
        }).start();


        lock.lock();


    }

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            key = generateKeyOwnedBy(instance);
        } else {
            key = generateKeyNotOwnedBy(instance);
        }


        final ILock lock = instance.getLock(key);
        Thread thread = new Thread(new Runnable() {
            public void run() {
                lock.lock();
            }
        });
        thread.start();
        thread.join();
        new Thread(new Runnable() {
            public void run() {
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                instance.shutdown();
            }
        }).start();
        lock.lock();
    }

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            key = generateKeyOwnedBy(instance1);
        } else {
            key = generateKeyNotOwnedBy(instance1);
        }


        final ILock lock = instance1.getLock(key);
        lock.lock(10, TimeUnit.SECONDS);
        assertTrue(lock.getRemainingLeaseTime() > 0);
        assertTrue(lock.isLocked());


        final CountDownLatch latch = new CountDownLatch(1);
        Thread t = new Thread(new Runnable() {
            public void run() {
                final ILock lock = instance2.getLock(key);
                lock.lock();
                latch.countDown();


            }
        });
        t.start();

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    @Test
    public void testLockCount() throws Exception {
        HazelcastInstance instance = createHazelcastInstance();


        ILock lock = instance.getLock(randomString());
        lock.lock();
        assertEquals(1, lock.getLockCount());
        assertTrue(lock.tryLock());
        assertEquals(2, lock.getLockCount());


        lock.unlock();
        assertEquals(1, lock.getLockCount());
        assertTrue(lock.isLocked());


        lock.unlock();
        assertEquals(0, lock.getLockCount());
        assertFalse(lock.isLocked());
        assertEquals(-1L, lock.getRemainingLeaseTime());
    }

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        final TestHazelcastInstanceFactory nodeFactory = createHazelcastInstanceFactory(3);
        final HazelcastInstance h1 = nodeFactory.newHazelcastInstance();
        final HazelcastInstance h2 = nodeFactory.newHazelcastInstance();
        final HazelcastInstance h3 = nodeFactory.newHazelcastInstance();
        final String key = "testLockIsLocked";
        final ILock lock = h1.getLock(key);
        final ILock lock2 = h2.getLock(key);


        assertFalse(lock.isLocked());
        assertFalse(lock2.isLocked());
        lock.lock();
        assertTrue(lock.isLocked());
        assertTrue(lock2.isLocked());


        final CountDownLatch latch = new CountDownLatch(1);
        final CountDownLatch latch2 = new CountDownLatch(1);


        Thread thread = new Thread(new Runnable() {
            public void run() {
                ILock lock3 = h3.getLock(key);
                assertTrue(lock3.isLocked());
                try {
                    latch2.countDown();
                    while (lock3.isLocked()) {
                        Thread.sleep(100);
                    }
                    latch.countDown();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);

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        final HazelcastInstance instance1 = nodeFactory.newHazelcastInstance();
        final HazelcastInstance instance2 = nodeFactory.newHazelcastInstance();


        final String key = randomString();


        final ILock lock = instance1.getLock(key);
        lock.lock();
        assertTrue(lock.isLocked());
        assertTrue(lock.isLockedByCurrentThread());


        assertTrue(lock.tryLock());
        assertTrue(lock.isLocked());
        assertTrue(lock.isLockedByCurrentThread());


        final AtomicBoolean result = new AtomicBoolean();
        final Thread thread = new Thread() {
            public void run() {
                result.set(lock.isLockedByCurrentThread());
            }
        };
        thread.start();
        thread.join();
        assertFalse(result.get());


        lock.unlock();
        assertTrue(lock.isLocked());
        assertTrue(lock.isLockedByCurrentThread());
    }

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        TestHazelcastInstanceFactory nodeFactory = createHazelcastInstanceFactory(2);
        HazelcastInstance lockOwner = nodeFactory.newHazelcastInstance();
        final HazelcastInstance instance1 = nodeFactory.newHazelcastInstance();


        final String name = randomString();
        final ILock lock = lockOwner.getLock(name);
        lock.lock();
        assertTrue(lock.isLocked());
        final CountDownLatch latch = new CountDownLatch(1);
        Thread t = new Thread(new Runnable() {
            public void run() {
                final ILock lock = instance1.getLock(name);
                lock.lock();
                latch.countDown();


            }
        });
        t.start();

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