Examples of com.hazelcast.core.ITopic

com.hazelcast.core.ITopic

Hazelcast provides distribution mechanism for publishing messages that are delivered to multiple subscribers which is also known as publish/subscribe (pub/sub) messaging model. Publish and subscriptions are cluster-wide. When a member subscribes for a topic, it is actually registering for messages published by any member in the cluster, including the new members joined after you added the listener.
Messages are ordered, meaning, listeners(subscribers) will process the messages in the order they are actually published. If cluster member M publishes messages m1, m2, m3...mn to a topic T, then Hazelcast makes sure that all of the subscribers of topic T will receive and process m1, m2, m3...mn in order.

    private CombinedClassLoader combinedClassLoader;


    @Override
    public EventProducer getEventProducer(String name, Boolean pubsub) {
        if (pubsub) {
                ITopic topic = instance.getTopic(Constants.TOPIC + Constants.SEPARATOR + name);
                TopicProducer producer = new TopicProducer();
                producer.setInstance(instance);
                producer.setTopic(topic);
                producer.setNode(getNode());
                producer.init();

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    }


    @Override
    public EventConsumer getEventConsumer(String name, Boolean pubsub) {
        if (pubsub) {
                ITopic topic = instance.getTopic(Constants.TOPIC + Constants.SEPARATOR + name);
                TopicConsumer consumer = new TopicConsumer();
                consumer.setTopic(topic);
                consumer.setInstance(instance);
                consumer.setNode(getNode());
                consumer.setDispatcher(dispatcher);

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        CountDownLatch l1 = new CountDownLatch(1000);
        CountDownLatch l2 = new CountDownLatch(1000);
        CountDownLatch l3 = new CountDownLatch(1000);


        ITopic t1 = h1.getTopic("foo");
        ITopic t2 = h2.getTopic("foo");
        ITopic t3 = h3.getTopic("foo");


        t1.addMessageListener(createMessageListener(l1));
        t2.addMessageListener(createMessageListener(l2));
        t3.addMessageListener(createMessageListener(l3));


        MemberImpl m1 = (MemberImpl) h1.getCluster().getLocalMember();
        MemberImpl m2 = (MemberImpl) h2.getCluster().getLocalMember();
        MemberImpl m3 = (MemberImpl) h3.getCluster().getLocalMember();

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public class TopicTest extends HazelcastTestSupport {


    @Test
    public void testDestroyTopicRemovesStatistics() {
        HazelcastInstance instance = createHazelcastInstance();
        final ITopic topic = instance.getTopic("foo");
        topic.publish("foobar");


        //we need to give the message the chance to be processed, else the topic statistics are recreated.
        //so in theory the destroy for the topic is broken.
        sleepSeconds(1);


        topic.destroy();


        final TopicService topicService = getNode(instance).nodeEngine.getService(TopicService.SERVICE_NAME);


        assertTrueEventually(new AssertTask() {
            @Override
            public void run() {
                boolean containsStats = topicService.getStatsMap().containsKey(topic.getName());
                assertFalse(containsStats);
            }
        });
    }

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    @Test
    public void testPerformance() throws InterruptedException {
        HazelcastInstance hazelcastInstance = createHazelcastInstance();
        int count = 10000;
        final ITopic topic = hazelcastInstance.getTopic("perf");
        ExecutorService ex = Executors.newFixedThreadPool(10);
        final CountDownLatch l = new CountDownLatch(count);
        for (int i = 0; i < count; i++) {
            ex.submit(new Runnable() {
                public void run() {
                    topic.publish("my object");
                    l.countDown();
                }
            });
        }
        assertTrue(l.await(20, TimeUnit.SECONDS));

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            this.name = s;
        }
    }


    private List<Runnable> loadTopicOperations() {
        ITopic topic = hazelcast.getTopic("myTopic");
        topic.addMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                messagesReceived.incrementAndGet();
            }
        });
        List<Runnable> operations = new ArrayList<Runnable>();
        addOperation(operations, new Runnable() {
            public void run() {
                ITopic topic = hazelcast.getTopic("myTopic");
                topic.publish(String.valueOf(random.nextInt(100000000)));
                messagesSend.incrementAndGet();
            }
        }, 10);
        return operations;
    }

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Related Classes of com.hazelcast.core.ITopic

com.hazelcast.core.standalone.AllTest

com.hazelcast.examples.AllTest

com.hazelcast.management.TimedMemberStateFactory

com.hazelcast.spi.EventServiceTest

com.hazelcast.topic.TopicTest

org.apache.karaf.cellar.hazelcast.HazelcastClusterManager

org.apache.karaf.cellar.hazelcast.HazelcastEventTransportFactory

org.apache.karaf.cellar.hazelcast.HazelcastGroupManager

org.atmosphere.plugin.hazelcast.HazelcastSerializedBroadcasterTest

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