SubscribeClosePublishThenConsumeTest.java

/**
 * 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());
   }
}