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(timeout = 1000 * 60)
    public void testOneMemberSQLWithIndex() {
        HazelcastInstance h1 = createHazelcastInstance();
        IMap imap = h1.getMap("employees");
        imap.addIndex("name", false);
        imap.addIndex("age", true);
        imap.addIndex("active", false);
        doFunctionalSQLQueryTest(imap);
    }

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        assertEquals(9, map.size());
    }


    @Test
    public void testTryPutRemove() throws Exception {
        final IMap map = createMap();
        assertTrue(map.tryPut("key1", "value1", 1, TimeUnit.SECONDS));
        assertTrue(map.tryPut("key2", "value2", 1, TimeUnit.SECONDS));
        map.lock("key1");
        map.lock("key2");


        final CountDownLatch latch = new CountDownLatch(2);


        new Thread() {
            public void run() {
                boolean result = map.tryPut("key1", "value3", 1, TimeUnit.SECONDS);
                if (!result) {
                    latch.countDown();
                }
            }
        }.start();


        new Thread() {
            public void run() {
                boolean result = map.tryRemove("key2", 1, TimeUnit.SECONDS);
                if (!result) {
                    latch.countDown();
                }
            }
        }.start();


        assertTrue(latch.await(20, TimeUnit.SECONDS));
        assertEquals("value1", map.get("key1"));
        assertEquals("value2", map.get("key2"));
        map.forceUnlock("key1");
        map.forceUnlock("key2");


    }

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        HazelcastInstance h2 = nodeFactory.newHazelcastInstance();


        EntryObject e = new PredicateBuilder().getEntryObject();
        Predicate predicate = e.is("active").and(e.get("name").equal(null).and(e.get("city").isNull()));


        IMap imap1 = h1.getMap("employees");
        IMap imap2 = h2.getMap("employees");


        for (int i = 0; i < 5000; i++) {
            boolean test = i % 2 == 0;
            imap1.put(String.valueOf(i), new Employee(test ? null : "name" + i,
                    test ? null : "city" + i, i % 60, true, (double) i));
        }
        long start = Clock.currentTimeMillis();
        Set<Map.Entry> entries = imap2.entrySet(predicate);
        long tookWithout = (Clock.currentTimeMillis() - start);
        assertEquals(2500, entries.size());
        for (Map.Entry entry : entries) {
            Employee c = (Employee) entry.getValue();
            assertNull(c.getName());
            assertNull(c.getCity());
        }
        imap1.destroy();


        imap1 = h1.getMap("employees2");
        imap2 = h2.getMap("employees2");
        imap1.addIndex("name", false);
        imap1.addIndex("city", true);
        imap1.addIndex("age", true);
        imap1.addIndex("active", false);


        for (int i = 0; i < 5000; i++) {
            boolean test = i % 2 == 0;
            imap1.put(String.valueOf(i), new Employee(test ? null : "name" + i,
                    test ? null : "city" + i, i % 60, true, (double) i));
        }
        start = Clock.currentTimeMillis();
        entries = imap2.entrySet(predicate);
        long tookWithIndex = (Clock.currentTimeMillis() - start);
        assertEquals(2500, entries.size());
        for (Map.Entry entry : entries) {
            Employee c = (Employee) entry.getValue();
            assertNull(c.getName());

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    @Test(timeout = 1000 * 60)
    public void testTwoMembers() {
        TestHazelcastInstanceFactory nodeFactory = createHazelcastInstanceFactory(2);
        HazelcastInstance h1 = nodeFactory.newHazelcastInstance();
        HazelcastInstance h2 = nodeFactory.newHazelcastInstance();
        IMap imap = h1.getMap("employees");
        doFunctionalQueryTest(imap);
    }

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

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    }


    @Test
    public void testPutTtl() throws Exception {
        final IMap map = createMap();
        map.put("key1", "value1", 1, TimeUnit.SECONDS);
        assertNotNull(map.get("key1"));
        Thread.sleep(2000);
        assertNull(map.get("key1"));
    }

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    @Test(timeout = 1000 * 60)
    public void testTwoMembersWithIndexesAndShutdown() {
        TestHazelcastInstanceFactory nodeFactory = createHazelcastInstanceFactory(2);
        HazelcastInstance h1 = nodeFactory.newHazelcastInstance();
        HazelcastInstance h2 = 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());
        h2.getLifecycleService().shutdown();
        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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        assertNull(map.get("key1"));
    }


    @Test
    public void testPutIfAbsent() throws Exception {
        final IMap map = createMap();
        assertNull(map.putIfAbsent("key1", "value1"));
        assertEquals("value1", map.putIfAbsent("key1", "value3"));
    }

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    @Test(timeout = 1000 * 60)
    public void testTwoMembersWithIndexesAndShutdown2() {
        TestHazelcastInstanceFactory nodeFactory = createHazelcastInstanceFactory(2);
        HazelcastInstance h1 = nodeFactory.newHazelcastInstance();
        HazelcastInstance h2 = 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());
        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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        assertEquals("value1", map.putIfAbsent("key1", "value3"));
    }


    @Test
    public void testPutIfAbsentTtl() throws Exception {
        final IMap map = createMap();
        assertNull(map.putIfAbsent("key1", "value1", 1, TimeUnit.SECONDS));
        assertEquals("value1", map.putIfAbsent("key1", "value3", 1, TimeUnit.SECONDS));
        Thread.sleep(6000);
        assertNull(map.putIfAbsent("key1", "value3", 1, TimeUnit.SECONDS));
        assertEquals("value3", map.putIfAbsent("key1", "value4", 1, TimeUnit.SECONDS));
    }

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