Examples of com.hazelcast.core.MultiMap.lock()

com.hazelcast.core.MultiMap.lock()
Acquires the lock for the specified key.
If the lock is not available then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired.
Scope of the lock is this multimap only. Acquired lock is only for the key in this multimap.
Locks are re-entrant so if the key is locked N times then it should be unlocked N times before another thread can acquire it.

Warning:

This method uses hashCode and equals of binary form of the key, not the actual implementations of hashCode and equals defined in key's class.
@param key key to lock.


    @Test
    public void testTryLock_whenLockedByOther() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "Key1";
        mm.lock(key);
        final CountDownLatch tryLockFailed = new CountDownLatch(1);
        new Thread() {
            public void run() {
                if (mm.tryLock(key) == false) {
                    tryLockFailed.countDown();

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    @Test
    public void testTryLockWaitingOnLockedKey_thenKeyUnlockedByOtherThread() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "keyZ";


        mm.lock(key);


        final CountDownLatch tryLockReturnsTrue = new CountDownLatch(1);
        new Thread(){
            public void run() {
                try {

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    @Test
    public void testForceUnlock_whenKeyLocked() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "Key";
        mm.lock(key);
        mm.forceUnlock(key);
        assertFalse(mm.isLocked(key));
    }


    @Test

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    @Test
    public void testForceUnlock_whenKeyLockedTwice() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "Key";
        mm.lock(key);
        mm.lock(key);
        mm.forceUnlock(key);
        assertFalse(mm.isLocked(key));
    }

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    @Test
    public void testForceUnlock_whenKeyLockedTwice() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "Key";
        mm.lock(key);
        mm.lock(key);
        mm.forceUnlock(key);
        assertFalse(mm.isLocked(key));
    }


    @Test

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    @Test
    public void testForceUnlock_whenKeyLockedByOther() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "key";
        mm.lock(key);
        final CountDownLatch forceUnlock = new CountDownLatch(1);
        new Thread(){
            public void run() {
                mm.forceUnlock(key);
                forceUnlock.countDown();

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    @Test
    public void testForceUnlock_whenKeyLockedTwiceByOther() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "key";
        mm.lock(key);
        mm.lock(key);
        final CountDownLatch forceUnlock = new CountDownLatch(1);
        new Thread(){
            public void run() {
                mm.forceUnlock(key);

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    @Test
    public void testForceUnlock_whenKeyLockedTwiceByOther() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "key";
        mm.lock(key);
        mm.lock(key);
        final CountDownLatch forceUnlock = new CountDownLatch(1);
        new Thread(){
            public void run() {
                mm.forceUnlock(key);
                forceUnlock.countDown();

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    @Test
    public void testLockTTL() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "Key";


        mm.lock(key, 30, TimeUnit.SECONDS);
        assertTrue(mm.isLocked(key));
    }


    @Test(expected = IllegalArgumentException.class)
    public void testLockTTL_whenZeroTimeout() throws Exception {

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    @Test(expected = IllegalArgumentException.class)
    public void testLockTTL_whenZeroTimeout() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "Key";
        mm.lock(key, 0, TimeUnit.SECONDS);
    }


    @Test(expected = IllegalArgumentException.class)
    public void testLockTTL_whenNegativeTimeout() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());

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