ActiveMQ example source code file (SubscribeClosePublishThenConsumeTest.java)

This example ActiveMQ source code file (SubscribeClosePublishThenConsumeTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

activemqconnectionfactory, connection, connection, hello, logger, message, messageproducer, string, string, testsupport, textmessage, textmessage, world, world

The ActiveMQ SubscribeClosePublishThenConsumeTest.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.usecases;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.jms.TopicSubscriber;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.test.TestSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Paul Smith
 * 
 */
public class SubscribeClosePublishThenConsumeTest extends TestSupport {
    private static final Logger LOG = LoggerFactory.getLogger(SubscribeClosePublishThenConsumeTest.class);

    public void testDurableTopic() throws Exception {
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("vm://locahost");

        String topicName = "TestTopic";
        String clientID = getName();
        String subscriberName = "MySubscriber:" + System.currentTimeMillis();

        Connection connection = connectionFactory.createConnection();
        connection.setClientID(clientID);

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Topic topic = session.createTopic(topicName);

        // this should register a durable subscriber, we then close it to
        // test that we get messages from the producer later on
        TopicSubscriber subscriber = session.createDurableSubscriber(topic, subscriberName);
        connection.start();

        topic = null;
        subscriber.close();
        subscriber = null;
        session.close();
        session = null;

        // Create the new connection before closing to avoid the broker shutting
        // down.
        // now create a new Connection, Session & Producer, send some messages &
        // then close
        Connection t = connectionFactory.createConnection();
        connection.close();
        connection = t;

        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        topic = session.createTopic(topicName);
        MessageProducer producer = session.createProducer(topic);
        producer.setDeliveryMode(DeliveryMode.PERSISTENT);
        TextMessage textMessage = session.createTextMessage("Hello World");
        producer.send(textMessage);
        textMessage = null;

        topic = null;
        session.close();
        session = null;

        // Now (re)register the Durable subscriber, setup a listener and wait
        // for messages that should
        // have been published by the previous producer
        t = connectionFactory.createConnection();
        connection.close();
        connection = t;

        connection.setClientID(clientID);
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        topic = session.createTopic(topicName);

        subscriber = session.createDurableSubscriber(topic, subscriberName);
        connection.start();

        LOG.info("Started connection - now about to try receive the textMessage");

        long time = System.currentTimeMillis();
        Message message = subscriber.receive(15000L);
        long elapsed = System.currentTimeMillis() - time;

        LOG.info("Waited for: " + elapsed + " millis");

        assertNotNull("Should have received the message we published by now", message);
        assertTrue("should be text textMessage", message instanceof TextMessage);
        textMessage = (TextMessage)message;
        assertEquals("Hello World", textMessage.getText());
    }
}