QueueDuplicatesTest.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.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import junit.framework.TestCase;

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

public class QueueDuplicatesTest extends TestCase {

   private static final Logger LOG = LoggerFactory.getLogger(QueueDuplicatesTest.class);

   private static DateFormat formatter = new SimpleDateFormat("HH:mm:ss SSS");
   private String brokerUrl;
   private String subject;
   private Connection brokerConnection;

   public QueueDuplicatesTest(String name) {
      super(name);
   }

   @Override
   protected void setUp() throws Exception {
      String peerUrl = "peer://localhost:6099";

      subject = this.getClass().getName();

      ActiveMQConnectionFactory fac = createFactory(peerUrl);
      brokerConnection = fac.createConnection();
      brokerConnection.start();
   }

   @Override
   protected void tearDown() throws Exception {
      if (brokerConnection != null) {
         brokerConnection.close();
      }
   }

   public void testDuplicates() {
      try {
         // Get Session
         Session session = createSession(brokerConnection);
         // create consumer
         Destination dest = session.createQueue(subject);
         MessageConsumer consumer = session.createConsumer(dest);
         // subscribe to queue
         consumer.setMessageListener(new SimpleConsumer());
         // create producer
         Thread sendingThread = new SendingThread(brokerUrl, subject);
         // start producer
         sendingThread.start();
         // wait about 5 seconds
         Thread.sleep(5000);
         // unsubscribe consumer
         consumer.close();
         // wait another 5 seconds
         Thread.sleep(5000);
         // create new consumer
         consumer = session.createConsumer(dest);
         // subscribe to queue
         consumer.setMessageListener(new SimpleConsumer());
         // sleep a little while longer
         Thread.sleep(15000);
         session.close();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

   Session createSession(Connection peerConnection) throws JMSException {
      // Connect using peer to peer connection
      Session session = peerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      return session;
   }

   private ActiveMQConnectionFactory createFactory(String brokerUrl) {
      ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory();
      cf.setBrokerURL(brokerUrl);

      return cf;
   }

   private class SendingThread extends Thread {

      private final String subject;

      SendingThread(String brokerUrl, String subject) {
         this.subject = subject;
         setDaemon(false);
      }

      @Override
      public void run() {
         try {
            Session session = createSession(brokerConnection);
            Destination dest = session.createQueue(subject);
            MessageProducer producer = session.createProducer(dest);
            producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
            for (int i = 0; i < 20; i++) {
               String txt = "Text Message: " + i;
               TextMessage msg = session.createTextMessage(txt);
               producer.send(msg);
               LOG.info(formatter.format(new Date()) + " Sent ==> " + msg + " to " + subject);
               Thread.sleep(1000);
            }
            session.close();
         } catch (Exception e) {
            e.printStackTrace();
         }
      }
   }

   private static class SimpleConsumer implements MessageListener {

      private final Map<String, Message> msgs = new HashMap<>();

      @Override
      public void onMessage(Message message) {
         LOG.info(formatter.format(new Date()) + " SimpleConsumer Message Received: " + message);
         try {
            String id = message.getJMSMessageID();
            assertNull("Message is duplicate: " + id, msgs.get(id));
            msgs.put(id, message);
         } catch (Exception e) {
            e.printStackTrace();
         }
      }
   }
}