Examples of com.hazelcast.core.IMap

com.hazelcast.core.IMap
Concurrent, distributed, observable and queryable map.

This class is not a general-purpose ConcurrentMap implementation! While this class implements the Map interface, it intentionally violates Map's general contract, which mandates the use of the equals method when comparing objects. Instead of the equals method this implementation compares the serialized byte version of the objects.

Gotchas:
- Methods, including but not limited to get, containsKey, containsValue, evict, remove, put, putIfAbsent, replace, lock, unlock, do not use hashCode and equals implementations of keys, instead they use hashCode and equals of binary (serialized) forms of the objects.
- get method returns a clone of original values, modifying the returned value does not change the actual value in the map. One should put modified value back to make changes visible to all nodes. For additional info see {@link IMap#get(Object)}.
- Methods, including but not limited to 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.
This class does not allow null to be used as a key or value.
@param < K> key @param < V> value @see java.util.concurrent.ConcurrentMap

        });
    }


    @Test
    public void testNearCacheTTLCleanup() {
        final IMap map = client.getMap(randomMapName(NEAR_CACHE_WITH_TTL));


        final int size = 100;
        populateNearCache(map, size);


        NearCacheStats stats = map.getLocalMapStats().getNearCacheStats();
        assertEquals(size, stats.getOwnedEntryCount());


        sleepSeconds(MAX_TTL_SECONDS + 1);
        // map.put() and map.get() triggers near cache eviction/expiration process
        map.put(0, 0);


        HazelcastTestSupport.assertTrueEventually(new AssertTask() {
            public void run() throws Exception {
                NearCacheStats stats = map.getLocalMapStats().getNearCacheStats();
                long ownedEntryCount = stats.getOwnedEntryCount();
                assertTrue(ownedEntryCount < size);
            }
        });
    }

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        });
    }


    @Test
    public void testNearCacheIdleRecordsEvicted() {
        final IMap map = client.getMap(randomMapName(NEAR_CACHE_WITH_IDLE));


        final int size = 147;
        populateNearCache(map, size);


        //generate near cache hits
        for (int i = 0; i < size; i++) {
            map.get(i);
        }


        NearCacheStats stats = map.getLocalMapStats().getNearCacheStats();
        long hitsBeforeIdleExpire = stats.getHits();


        sleepSeconds(MAX_IDLE_SECONDS + 1);


        for (int i = 0; i < size; i++) {
            map.get(i);
        }
        stats = map.getLocalMapStats().getNearCacheStats();


        assertEquals("as the hits are not equal, the entries were not cleared from near cash after MaxIdleSeconds", hitsBeforeIdleExpire, stats.getHits(), size);
    }

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    }


    @Test
    public void testNearCacheInvalidateOnChange() {
        final String mapName = randomMapName(NEAR_CACHE_WITH_INVALIDATION);
        final IMap nodeMap = h1.getMap(mapName);
        final IMap clientMap = client.getMap(mapName);


        final int size = 118;
        for (int i = 0; i < size; i++) {
            nodeMap.put(i, i);
        }
        //populate near cache
        for (int i = 0; i < size; i++) {
            clientMap.get(i);
        }


        NearCacheStats stats = clientMap.getLocalMapStats().getNearCacheStats();
        long OwnedEntryCountBeforeInvalidate = stats.getOwnedEntryCount();


        //invalidate near cache from cluster
        for (int i = 0; i < size; i++) {
            nodeMap.put(i, i);
        }


        assertEquals(size, OwnedEntryCountBeforeInvalidate);


        assertTrueEventually(new AssertTask() {
            public void run() throws Exception {
                NearCacheStats stats = clientMap.getLocalMapStats().getNearCacheStats();
                assertEquals(0, stats.getOwnedEntryCount());
            }
        });
    }

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        });
    }


    @Test(expected = NullPointerException.class)
    public void testNearCacheContainsNullKey() {
        final IMap map = client.getMap(randomMapName(NEAR_CACHE_WITH_INVALIDATION));
        map.containsKey(null);
    }

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        map.containsKey(null);
    }


    @Test
    public void testNearCacheContainsKey() {
        final IMap map = client.getMap(randomMapName(NEAR_CACHE_WITH_INVALIDATION));
        final Object key = "key";


        map.put(key, "value");
        map.get(key);


        assertTrue(map.containsKey(key));
    }

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        assertTrue(map.containsKey(key));
    }


    @Test
    public void testNearCacheContainsKey_whenKeyAbsent() {
        final IMap map = client.getMap(randomMapName(NEAR_CACHE_WITH_INVALIDATION));


        assertFalse(map.containsKey("NOT_THERE"));
    }

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        assertFalse(map.containsKey("NOT_THERE"));
    }


    @Test
    public void testNearCacheContainsKey_afterRemove() {
        final IMap map = client.getMap(randomMapName(NEAR_CACHE_WITH_INVALIDATION));
        final Object key = "key";


        map.put(key, "value");
        map.get(key);
        map.remove(key);


        assertFalse(map.containsKey(key));
    }

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        nearCacheConfig.setInvalidateOnChange(true);
        cfg.getMapConfig(mapName).setNearCacheConfig(nearCacheConfig);
        final TestHazelcastInstanceFactory factory = createHazelcastInstanceFactory(2);
        final HazelcastInstance hazelcastInstance1 = factory.newHazelcastInstance(cfg);
        final HazelcastInstance hazelcastInstance2 = factory.newHazelcastInstance(cfg);
        final IMap map1 = hazelcastInstance1.getMap(mapName);
        final IMap map2 = hazelcastInstance2.getMap(mapName);
        final int size = 10;
        //populate map.
        for (int i = 0; i < size; i++) {
            map1.put(i, i);
        }
        //populate near cache
        for (int i = 0; i < size; i++) {
            map1.get(i);
            map2.get(i);
        }
        //clear map should trigger near cache eviction.
        map1.clear();
        for (int i = 0; i < size; i++) {
            assertNull(map1.get(i));

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        mapConfig.setTimeToLiveSeconds(ttl);
        final TestHazelcastInstanceFactory factory = createHazelcastInstanceFactory(instanceCount);
        final HazelcastInstance instance1 = factory.newHazelcastInstance(cfg);
        final HazelcastInstance instance2 = factory.newHazelcastInstance(cfg);
        final HazelcastInstance instance3 = factory.newHazelcastInstance(cfg);
        final IMap map1 = instance1.getMap(mapName);
        final IMap map2 = instance2.getMap(mapName);
        final IMap map3 = instance3.getMap(mapName);
        //observe eviction
        final CountDownLatch latch = new CountDownLatch(size);
        map1.addEntryListener(new EntryAdapter() {
            public void entryEvicted(EntryEvent event) {
                latch.countDown();
            }
        }, false);
        //populate map
        for (int i = 0; i < size; i++) {
            //populate.
            map1.put(i, i);
            //bring near caches. -- here is a time window
            //that "i" already evicted. so a "get" brings
            //a NULL object to the near cache.
            map1.get(i);
            map2.get(i);
            map3.get(i);
        }
        //wait operations to complete
        assertOpenEventually(latch);
        //check map size after eviction.
        assertEquals(0, map1.size());
        assertEquals(0, map2.size());
        assertEquals(0, map3.size());
        //near cache sizes should be zero after eviction.
        assertTrueEventually(new AssertTask() {
            @Override
            public void run() throws Exception {
                assertEquals(0, countNotNullValuesInNearCache(mapName, instance1));

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    }


    @Test
    public void testGetName() {
        String mapName = randomString();
        final IMap map = client.getMap(mapName);
        assertEquals(mapName, map.getName());
    }

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