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

        assertEquals("value3", map.putIfAbsent("key1", "value4", 1, TimeUnit.SECONDS));
    }


    @Test
    public void testSet() throws Exception {
        final IMap map = createMap();
        map.set("key1", "value1");
        assertEquals("value1", map.get("key1"));


        map.set("key1", "value2");
        assertEquals("value2", map.get("key1"));


        map.set("key1", "value3", 1, TimeUnit.SECONDS);
        assertEquals("value3", map.get("key1"));


        Thread.sleep(2000);
        assertNull(map.get("key1"));


    }

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    @Test(timeout = 1000 * 60)
    public void testTwoMembersWithIndexesAndShutdown3() {
        TestHazelcastInstanceFactory nodeFactory = createHazelcastInstanceFactory(2);
        HazelcastInstance h1 = nodeFactory.newHazelcastInstance();
        IMap imap = h1.getMap("employees");
        imap.addIndex("name", false);
        imap.addIndex("age", true);
        imap.addIndex("active", false);
        doFunctionalQueryTest(imap);
        assertEquals(101, imap.size());
        HazelcastInstance h2 = nodeFactory.newHazelcastInstance();
        assertEquals(101, imap.size());
        h1.getLifecycleService().shutdown();
        imap = h2.getMap("employees");
        assertEquals(101, imap.size());
        Set<Map.Entry> entries = imap.entrySet(new SqlPredicate("active and age=23"));
        assertEquals(2, entries.size());
        for (Map.Entry entry : entries) {
            Employee c = (Employee) entry.getValue();
            assertEquals(c.getAge(), 23);
            assertTrue(c.isActive());

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        assertFalse(transientMapStore.latch.await(5, TimeUnit.SECONDS));
    }


    @Test
    public void testLock() throws Exception {
        final IMap map = createMap();
        map.put("key1", "value1");
        assertEquals("value1", map.get("key1"));
        map.lock("key1");
        final CountDownLatch latch = new CountDownLatch(1);
        new Thread() {
            public void run() {
                map.tryPut("key1", "value2", 1, TimeUnit.SECONDS);
                latch.countDown();
            }
        }.start();
        assertTrue(latch.await(5, TimeUnit.SECONDS));
        assertEquals("value1", map.get("key1"));
        map.forceUnlock("key1");
    }

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    @Test(timeout = 1000 * 60)
    public void testSecondMemberAfterAddingIndexes() {
        TestHazelcastInstanceFactory nodeFactory = createHazelcastInstanceFactory(2);
        HazelcastInstance h1 = nodeFactory.newHazelcastInstance();
        IMap imap = h1.getMap("employees");
        imap.addIndex("name", false);
        imap.addIndex("age", true);
        imap.addIndex("active", false);
        HazelcastInstance h2 = nodeFactory.newHazelcastInstance();
        doFunctionalQueryTest(imap);
    }

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        map.forceUnlock("key1");
    }


    @Test
    public void testLockTtl() throws Exception {
        final IMap map = createMap();
        map.put("key1", "value1");
        assertEquals("value1", map.get("key1"));
        map.lock("key1", 2, TimeUnit.SECONDS);
        final CountDownLatch latch = new CountDownLatch(1);
        new Thread() {
            public void run() {
                map.tryPut("key1", "value2", 5, TimeUnit.SECONDS);
                latch.countDown();
            }
        }.start();
        assertTrue(latch.await(10, TimeUnit.SECONDS));
        assertFalse(map.isLocked("key1"));
        assertEquals("value2", map.get("key1"));
        map.forceUnlock("key1");
    }

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        Config cfg = new Config();
        cfg.getMapConfig("testMapWithIndexAfterShutDown").addMapIndexConfig(new MapIndexConfig("typeName", false));


        HazelcastInstance[] instances = createHazelcastInstanceFactory(3).newInstances(cfg);


        final IMap map = instances[0].getMap("testMapWithIndexAfterShutDown");
        final int SAMPLE_SIZE_1 = 100;
        final int SAMPLE_SIZE_2 = 30;
        int TOTAL_SIZE = SAMPLE_SIZE_1 + SAMPLE_SIZE_2;


        for (int i = 0; i < SAMPLE_SIZE_1; i++) {
            map.put(i, new ValueType("type" + i));
        }


        for (int i = SAMPLE_SIZE_1; i < TOTAL_SIZE; i++) {
            map.put(i, new ValueType("typex"));
        }


        Collection typexValues = map.values(new SqlPredicate("typeName = typex"));
        assertEquals(SAMPLE_SIZE_2, typexValues.size());


        instances[1].shutdown();


        assertEquals(TOTAL_SIZE, map.size());
        assertTrueEventually(new AssertTask() {
            public void run() {
                final Collection values = map.values(new SqlPredicate("typeName = typex"));
                assertEquals(SAMPLE_SIZE_2, values.size());
            }
        });


        instances[2].shutdown();


        assertEquals(TOTAL_SIZE, map.size());
        assertTrueEventually(new AssertTask() {
            public void run() {
                final Collection values = map.values(new SqlPredicate("typeName = typex"));
                assertEquals(SAMPLE_SIZE_2, values.size());
            }
        });
    }

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        map.forceUnlock("key1");
    }


    @Test
    public void testLockTtl2() throws Exception {
        final IMap map = createMap();
        map.lock("key1", 3, TimeUnit.SECONDS);
        final CountDownLatch latch = new CountDownLatch(2);
        new Thread() {
            public void run() {
                if (!map.tryLock("key1")) {
                    latch.countDown();
                }
                try {
                    if (map.tryLock("key1", 5, TimeUnit.SECONDS)) {
                        latch.countDown();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
        assertTrue(latch.await(10, TimeUnit.SECONDS));
        map.forceUnlock("key1");
    }

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                return set;
            }
        });
        cfg.getMapConfig(name).setMapStoreConfig(mapStoreConfig);
        HazelcastInstance instance = createHazelcastInstance(cfg);
        final IMap map = instance.getMap(name);


        assertTrueEventually(new AssertTask() {
            @Override
            public void run() throws Exception {
                Collection values = map.values(new SqlPredicate("active = true"));
                assertEquals(size, values.size());
            }
        });
    }

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        map.forceUnlock("key1");
    }


    @Test
    public void testTryLock() throws Exception {
        final IMap map = createMap();
        final IMap tempMap = map;


        assertTrue(tempMap.tryLock("key1", 2, TimeUnit.SECONDS));
        final CountDownLatch latch = new CountDownLatch(1);
        new Thread() {
            public void run() {
                try {
                    if (!tempMap.tryLock("key1", 2, TimeUnit.SECONDS)) {
                        latch.countDown();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
        assertTrue(latch.await(100, TimeUnit.SECONDS));


        assertTrue(tempMap.isLocked("key1"));


        final CountDownLatch latch2 = new CountDownLatch(1);
        new Thread() {
            public void run() {
                try {
                    if (tempMap.tryLock("key1", 20, TimeUnit.SECONDS)) {
                        latch2.countDown();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
        Thread.sleep(1000);
        tempMap.unlock("key1");
        assertTrue(latch2.await(100, TimeUnit.SECONDS));
        assertTrue(tempMap.isLocked("key1"));
        tempMap.forceUnlock("key1");
    }

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        tempMap.forceUnlock("key1");
    }


    @Test
    public void testForceUnlock() throws Exception {
        final IMap map = createMap();
        map.lock("key1");
        final CountDownLatch latch = new CountDownLatch(1);
        new Thread() {
            public void run() {
                map.forceUnlock("key1");
                latch.countDown();
            }
        }.start();
        assertTrue(latch.await(100, TimeUnit.SECONDS));
        assertFalse(map.isLocked("key1"));
    }

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