Examples of javax.jms.TopicPublisher

javax.jms.TopicPublisher
A client uses a TopicPublisher object to publish messages on a topic. A TopicPublisher object is the publish-subscribe form of a message producer.
Normally, the Topic is specified when a TopicPublisher is created. In this case, an attempt to use the publish methods for an unidentified TopicPublisher will throw a java.lang.UnsupportedOperationException.
If the TopicPublisher is created with an unidentified Topic, an attempt to use the publish methods that assume that the Topic has been identified will throw a java.lang.UnsupportedOperationException.
During the execution of its publish method, a message must not be changed by other threads within the client. If the message is modified, the result of the publish is undefined.
After publishing a message, a client may retain and modify it without affecting the message that has been published. The same message object may be published multiple times.
The following message headers are set as part of publishing a message: JMSDestination, JMSDeliveryMode, JMSExpiration, JMSPriority, JMSMessageID and JMSTimeStamp. When the message is published, the values of these headers are ignored. After completion of the publish, the headers hold the values specified by the method publishing the message. It is possible for the publish method not to set JMSMessageID and JMSTimeStamp if the setting of these headers is explicitly disabled by the MessageProducer.setDisableMessageID or MessageProducer.setDisableMessageTimestamp method.
Creating a MessageProducer provides the same features as creating a TopicPublisher. A MessageProducer object is recommended when creating new code. The TopicPublisher is provided to support existing code.
Because TopicPublisher inherits from MessageProducer, it inherits the send methods that are a part of the MessageProducer interface. Using the send methods will have the same effect as using the publish methods: they are functionally the same. @see Session#createProducer(Destination) @see TopicSession#createPublisher(Topic)

    {
        AMQConnection con1 = (AMQConnection) getClientConnection("guest", "guest", "clientid");
        AMQTopic topic = new AMQTopic(con1, "MyTopic3");


        TopicSession session1 = con1.createTopicSession(true, AMQSession.AUTO_ACKNOWLEDGE);
        TopicPublisher publisher = session1.createPublisher(topic);


        AMQConnection con2 = (AMQConnection) getClientConnection("guest", "guest", "clientid");
        TopicSession session2 = con2.createTopicSession(true, AMQSession.AUTO_ACKNOWLEDGE);
        TopicSubscriber sub = session2.createDurableSubscriber(topic, "subscription0");


        con2.start();


        publisher.publish(session1.createTextMessage("Hello"));
        session1.commit();
        TextMessage tm = (TextMessage) sub.receive(2000);
        session2.commit();
        assertNotNull(tm);
        con2.close();
        publisher.publish(session1.createTextMessage("Hello2"));
        session1.commit();
        con2 =  (AMQConnection) getClientConnection("guest", "guest", "clientid");
        session2 = con2.createTopicSession(true, AMQSession.NO_ACKNOWLEDGE);
        sub = session2.createDurableSubscriber(topic, "subscription0");
        con2.start();

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    {


        AMQConnection con = (AMQConnection) getConnection("guest", "guest");
        AMQTopic topic = new AMQTopic(con, "MyTopic4");
        TopicSession session1 = con.createTopicSession(true, AMQSession.AUTO_ACKNOWLEDGE);
        TopicPublisher publisher = session1.createPublisher(topic);
        MessageConsumer consumer1 = session1.createConsumer(topic);
        con.start();
        TextMessage tm = session1.createTextMessage("Hello");
        publisher.publish(tm);
        session1.commit();
        tm = (TextMessage) consumer1.receive(10000L);
        assertNotNull(tm);
        String msgText = tm.getText();
        assertEquals("Hello", msgText);
        tm = session1.createTextMessage();
        msgText = tm.getText();
        assertNull(msgText);
        publisher.publish(tm);
        session1.commit();
        tm = (TextMessage) consumer1.receive(10000L);
        assertNotNull(tm);
        session1.commit();
        msgText = tm.getText();
        assertNull(msgText);
        tm.clearBody();
        tm.setText("Now we are not null");
        publisher.publish(tm);
        session1.commit();
        tm = (TextMessage) consumer1.receive(2000);
        assertNotNull(tm);
        session1.commit();
        msgText = tm.getText();
        assertEquals("Now we are not null", msgText);


        tm = session1.createTextMessage("");
        msgText = tm.getText();
        assertEquals("Empty string not returned", "", msgText);
        publisher.publish(tm);
        session1.commit();
        tm = (TextMessage) consumer1.receive(2000);
        session1.commit();
        assertNotNull(tm);
        assertEquals("Empty string not returned", "", msgText);

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    {
        AMQConnection conn = (AMQConnection) getConnection("guest", "guest");
        TopicSession session = conn.createTopicSession(true, Session.AUTO_ACKNOWLEDGE);
        TemporaryTopic topic = session.createTemporaryTopic();
        assertNotNull(topic);
        TopicPublisher producer = session.createPublisher(topic);
        MessageConsumer consumer = session.createConsumer(topic);
        conn.start();
        TextMessage sentMessage = session.createTextMessage("Test Message");
        producer.send(sentMessage);
        session.commit();
        TextMessage receivedMessage = (TextMessage) consumer.receive(2000);
        assertNotNull(receivedMessage);
        assertEquals(sentMessage.getText(), receivedMessage.getText());
        producer.send(sentMessage);
        session.commit();
        receivedMessage = (TextMessage) consumer.receive(2000);
        assertNotNull(receivedMessage);
        assertEquals(sentMessage.getText(), receivedMessage.getText());
        session.commit();

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    {
        AMQConnection conn = (AMQConnection) getConnection("guest", "guest");
        TopicSession session = conn.createTopicSession(true, Session.AUTO_ACKNOWLEDGE);
        TemporaryTopic topic = session.createTemporaryTopic();
        assertNotNull(topic);
        TopicPublisher producer = session.createPublisher(topic);
        MessageConsumer consumer = session.createConsumer(topic);
        conn.start();
        producer.send(session.createTextMessage("hello"));
        session.commit();
        TextMessage tm = (TextMessage) consumer.receive(2000);
        assertNotNull(tm);
        assertEquals("hello", tm.getText());
        session.commit();

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        TopicSubscriber select = session1.createSubscriber(topic,  "Selector = 'select'", false);
        TopicSubscriber normal = session1.createSubscriber(topic);




        TopicPublisher publisher = session1.createPublisher(topic);


        con.start();
        TextMessage m;
        TextMessage message;


        //send message to all consumers
        publisher.publish(session1.createTextMessage("hello-new2"));
        session1.commit();
        //test normal subscriber gets message
        m = (TextMessage) normal.receive(1000);
        assertNotNull(m);
        session1.commit();


        //test selector subscriber doesn't message
        m = (TextMessage) select.receive(1000);
        assertNull(m);
        session1.commit();


        //test nolocal subscriber doesn't message
        m = (TextMessage) noLocal.receive(1000);
        if (m != null)
        {
            System.out.println("Message:" + m.getText());
        }
        assertNull(m);


        //send message to all consumers
        message = session1.createTextMessage("hello2");
        message.setStringProperty("Selector", "select");


        publisher.publish(message);
        session1.commit();


        //test normal subscriber gets message
        m = (TextMessage) normal.receive(1000);
        assertNotNull(m);
        session1.commit();


        //test selector subscriber does get message
        m = (TextMessage) select.receive(1000);
        assertNotNull(m);
        session1.commit();


        //test nolocal subscriber doesn't message
        m = (TextMessage) noLocal.receive(100);
        assertNull(m);


        AMQConnection con2 = (AMQConnection) getClientConnection("guest", "guest", "foo");
        TopicSession session2 = con2.createTopicSession(true, AMQSession.AUTO_ACKNOWLEDGE);
        TopicPublisher publisher2 = session2.createPublisher(topic);




        message = session2.createTextMessage("hello2");
        message.setStringProperty("Selector", "select");


        publisher2.publish(message);
        session2.commit();


        //test normal subscriber gets message
        m = (TextMessage) normal.receive(1000);
        assertNotNull(m);

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        TopicSession session = con.createTopicSession(true, AMQSession.NO_ACKNOWLEDGE);


        // Setup subscriber with selector
        TopicSubscriber selector = session.createSubscriber(topic,  "Selector = 'select'", false);
        TopicPublisher publisher = session.createPublisher(topic);


        con.start();
        TextMessage m;
        TextMessage message;


        // Send non-matching message
        message = session.createTextMessage("non-matching 1");
        publisher.publish(message);
        session.commit();


        // Send and consume matching message
        message = session.createTextMessage("hello");
        message.setStringProperty("Selector", "select");


        publisher.publish(message);
        session.commit();


        m = (TextMessage) selector.receive(1000);
        assertNotNull("should have received message", m);
        assertEquals("Message contents were wrong", "hello", m.getText());


        // Send non-matching message
        message = session.createTextMessage("non-matching 2");
        publisher.publish(message);
        session.commit();


        // Assert queue count is 0
        long depth = ((AMQTopicSessionAdaptor) session).getSession().getQueueDepth(topic);
        assertEquals("Queue depth was wrong", 0, depth);

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            connection.start();


            // Send messages which don't match and do match the selector, checking message count
            TopicSession pubSession = connection.createTopicSession(true, Session.SESSION_TRANSACTED);
            Topic topic = pubSession.createTopic(SELECTOR_TOPIC_NAME);
            TopicPublisher publisher = pubSession.createPublisher(topic);


            BDBStoreUpgradeTestPreparer.publishMessages(pubSession, publisher, topic, DeliveryMode.PERSISTENT, 1*1024, 1, "false");
            pubSession.commit();
            assertEquals("DurableSubscription backing queue should still have 1 message on it",
                         Integer.valueOf(1), dursubQueue.getMessageCount());

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            connection.start();


            // Send new message matching the topic, checking message count
            TopicSession session = connection.createTopicSession(true, Session.SESSION_TRANSACTED);
            Topic topic = session.createTopic(TOPIC_NAME);
            TopicPublisher publisher = session.createPublisher(topic);


            BDBStoreUpgradeTestPreparer.publishMessages(session, publisher, topic, DeliveryMode.PERSISTENT, 1*1024, 1, "indifferent");
            session.commit();
            assertEquals("DurableSubscription backing queue should now have 2 messages on it",
                        Integer.valueOf(2), dursubQueue.getMessageCount());

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        // Create a publisher and send a persistent message which matches the selector
        // followed by one that does not match, and another which matches but is not
        // committed and so should be 'lost'
        TopicSession pubSession = connection.createTopicSession(true, Session.SESSION_TRANSACTED);
        TopicPublisher publisher = pubSession.createPublisher(topic);


        publishMessages(pubSession, publisher, topic, DeliveryMode.PERSISTENT, 1*1024, 1, "true");
        publishMessages(pubSession, publisher, topic, DeliveryMode.PERSISTENT, 1*1024, 1, "false");
        pubSession.commit();
        publishMessages(pubSession, publisher, topic, DeliveryMode.PERSISTENT, 1*1024, 1, "true");


        publisher.close();
        pubSession.close();
        connection.close();
    }

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        TopicSubscriber durSub1 = session.createDurableSubscriber(topic, SUB_NAME);
        durSub1.close();


        // Create a publisher and send a persistent message which matches the subscription
        TopicSession pubSession = connection.createTopicSession(true, Session.SESSION_TRANSACTED);
        TopicPublisher publisher = pubSession.createPublisher(topic);


        publishMessages(pubSession, publisher, topic, DeliveryMode.PERSISTENT, 1*1024, 1, "indifferent");
        pubSession.commit();


        publisher.close();
        pubSession.close();
        connection.close();
    }

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