Examples of com.hazelcast.core.MultiMap

com.hazelcast.core.MultiMap
A specialized map whose keys can be associated with multiple values.

Gotchas:
- Methods, including but not limited to get, containsKey, containsValue, remove, put, lock, unlock, do not use hashCode and equals implementations of keys, instead they use hashCode and equals of binary (serialized) forms of the objects.
- Methods, including but not limited to get, remove, keySet, values, entrySet, return a collection clone of the values. The collection is NOT backed by the map, so changes to the map are NOT reflected in the collection, and vice-versa.
@author oztalip @see IMap

        mm.tryLock(null);
    }


    @Test
    public void testTryLock_whenLockedBySelf() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        final Object key = "Key";
        mm.lock(key);
        assertTrue(mm.tryLock(key));
    }

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        assertTrue(mm.tryLock(key));
    }


    @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();
                }
            }
        }.start();
        assertOpenEventually(tryLockFailed);

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        assertOpenEventually(tryLockFailed);
    }


    @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 {
                    if(mm.tryLock(key, 10, TimeUnit.SECONDS)){
                        tryLockReturnsTrue.countDown();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();


        mm.unlock(key);


        assertOpenEventually(tryLockReturnsTrue);
        assertTrue(mm.isLocked(key));
    }

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        assertTrue(mm.isLocked(key));
    }


    @Test(expected = NullPointerException.class)
    public void testForceUnlock_whenKeyNull() throws Exception {
        final MultiMap mm = client.getMultiMap(randomString());
        mm.forceUnlock(null);
    }

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        mm.forceUnlock(null);
    }


    @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));
    }

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        assertFalse(mm.isLocked(key));
    }


    @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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        assertFalse(mm.isLocked(key));
    }


    @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();
            }
        }.start();
        assertOpenEventually(forceUnlock);
        assertFalse(mm.isLocked(key));
    }

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        assertFalse(mm.isLocked(key));
    }


    @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();
            }
        }.start();
        assertOpenEventually(forceUnlock);
        assertFalse(mm.isLocked(key));
    }

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        assertFalse(mm.isLocked(key));
    }


    @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));
    }

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        assertTrue(mm.isLocked(key));
    }


    @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);
    }

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