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ActiveMQ example source code file (MessageGroupDelayedTest.java)

This example ActiveMQ source code file (MessageGroupDelayedTest.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

brokerservice, countdownlatch, countdownlatch, exception, hashmap, hashmap, integer, jmsxgroupid, message, set, set, string, threading, threads, util, worker, worker

The ActiveMQ MessageGroupDelayedTest.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 java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.CountDownLatch;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;

import junit.framework.Test;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.JmsTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.TransportConnector;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.command.ActiveMQQueue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;



public class MessageGroupDelayedTest extends JmsTestSupport {
  public static final Logger log = LoggerFactory.getLogger(MessageGroupDelayedTest.class);
  protected Connection connection;
  protected Session session;
  protected MessageProducer producer;
  protected Destination destination;
  
  public int consumersBeforeDispatchStarts;
  public int timeBeforeDispatchStarts;
  
  BrokerService broker;
  protected TransportConnector connector;
  
  protected HashMap<String, Integer> messageCount = new HashMap();
  protected HashMap<String, Set messageGroups = new HashMap>();
  
  public static Test suite() {
      return suite(MessageGroupDelayedTest.class);
  }

  public static void main(String[] args) {
      junit.textui.TestRunner.run(suite());
  }

  public void setUp() throws Exception {
	broker = createBroker();  
	broker.start();
    ActiveMQConnectionFactory connFactory = new ActiveMQConnectionFactory(connector.getConnectUri() + "?jms.prefetchPolicy.all=1");
    connection = connFactory.createConnection();
    session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
    destination = new ActiveMQQueue("test-queue2");
    producer = session.createProducer(destination);
    connection.start();
  }
  
  protected BrokerService createBroker() throws Exception {
      BrokerService service = new BrokerService();
      service.setPersistent(false);
      service.setUseJmx(false);

      // Setup a destination policy where it takes only 1 message at a time.
      PolicyMap policyMap = new PolicyMap();
      PolicyEntry policy = new PolicyEntry();
      log.info("testing with consumersBeforeDispatchStarts=" + consumersBeforeDispatchStarts + " and timeBeforeDispatchStarts=" + timeBeforeDispatchStarts);
      policy.setConsumersBeforeDispatchStarts(consumersBeforeDispatchStarts);
      policy.setTimeBeforeDispatchStarts(timeBeforeDispatchStarts);
      policyMap.setDefaultEntry(policy);
      service.setDestinationPolicy(policyMap);

      connector = service.addConnector("tcp://localhost:0");
      return service;
  }
  
  public void tearDown() throws Exception {
      producer.close();
      session.close();
      connection.close();
      broker.stop();
  }
  
  
  
  public void initCombosForTestDelayedDirectConnectionListener() {
	  addCombinationValues("consumersBeforeDispatchStarts", new Object[] {0, 3, 5});
	  addCombinationValues("timeBeforeDispatchStarts", new Object[] {0, 100});
  }
  
  public void testDelayedDirectConnectionListener() throws Exception {
	  
	for(int i = 0; i < 10; i++) {
      Message msga = session.createTextMessage("hello a");
      msga.setStringProperty("JMSXGroupID", "A");
      producer.send(msga);
      Message msgb = session.createTextMessage("hello b");
      msgb.setStringProperty("JMSXGroupID", "B");
      producer.send(msgb);
      Message msgc = session.createTextMessage("hello c");
      msgc.setStringProperty("JMSXGroupID", "C");
      producer.send(msgc);
    }
    log.info("30 messages sent to group A/B/C");
   
    int[] counters = {10, 10, 10};
    
    CountDownLatch startSignal = new CountDownLatch(1);
    CountDownLatch doneSignal = new CountDownLatch(1);

    messageCount.put("worker1", 0);
    messageGroups.put("worker1", new HashSet<String>());
    Worker worker1 = new Worker(connection, destination, "worker1", startSignal, doneSignal, counters, messageCount, messageGroups);
    messageCount.put("worker2", 0);
    messageGroups.put("worker2", new HashSet<String>());
    Worker worker2 = new Worker(connection, destination, "worker2", startSignal, doneSignal, counters, messageCount, messageGroups);
    messageCount.put("worker3", 0);
    messageGroups.put("worker3", new HashSet<String>());
    Worker worker3 = new Worker(connection, destination, "worker3", startSignal, doneSignal, counters, messageCount, messageGroups);


    new Thread(worker1).start();
    new Thread(worker2).start();
    new Thread(worker3).start();

    startSignal.countDown();
    doneSignal.await();
    
    // check results
    if (consumersBeforeDispatchStarts == 0 && timeBeforeDispatchStarts == 0) {
    	log.info("Ignoring results because both parameters are 0");
    	return;
    }
    
    for (String worker: messageCount.keySet()) {
    	log.info("worker " + worker + " received " + messageCount.get(worker) + " messages from groups " + messageGroups.get(worker));
    	assertEquals("worker " + worker + " received " + messageCount.get(worker) + " messages from groups " + messageGroups.get(worker)
    			, 10, messageCount.get(worker).intValue());
    	assertEquals("worker " + worker + " received " + messageCount.get(worker) + " messages from groups " + messageGroups.get(worker)
    			, 1, messageGroups.get(worker).size());
    }
    
  }

  private static final class Worker implements Runnable {
    private Connection connection = null;
    private Destination queueName = null;
    private String workerName = null;
    private CountDownLatch startSignal = null;
    private CountDownLatch doneSignal = null;
    private int[] counters = null;
    private HashMap<String, Integer> messageCount;
    private HashMap<String, SetmessageGroups;
    
    
    private Worker(Connection connection, Destination queueName, String workerName, CountDownLatch startSignal, CountDownLatch doneSignal, int[] counters, HashMap<String, Integer> messageCount, HashMap>messageGroups) {
      this.connection = connection;
      this.queueName = queueName;
      this.workerName = workerName;
      this.startSignal = startSignal;
      this.doneSignal = doneSignal;
      this.counters = counters;
      this.messageCount = messageCount;
      this.messageGroups = messageGroups;
    }
    
    private void update(String group) {
        int msgCount = messageCount.get(workerName);
        messageCount.put(workerName, msgCount + 1);
        Set<String> groups = messageGroups.get(workerName);
        groups.add(group);
        messageGroups.put(workerName, groups);
    }
    
    public void run() {

      try {
        log.info(workerName);
        startSignal.await();
        Session sess = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        MessageConsumer consumer = sess.createConsumer(queueName);

        while(true) {
          if(counters[0] == 0 && counters[1] == 0 && counters[2] == 0 ) {
            doneSignal.countDown();
            log.info(workerName + " done...");
            break;
          }
          
          Message msg = consumer.receive(500);
          if(msg == null)
            continue;

          String group = msg.getStringProperty("JMSXGroupID");
          boolean first = msg.getBooleanProperty("JMSXGroupFirstForConsumer");

          if("A".equals(group)){
        	--counters[0];
            update(group);
            Thread.sleep(500);
          }
          else if("B".equals(group)) {
        	--counters[1];
            update(group);
            Thread.sleep(100);
          }
          else if("C".equals(group)) {
        	--counters[2];
            update(group);
            Thread.sleep(10);
          }
          else {
            log.warn("unknown group");
          }
          if (counters[0] != 0 || counters[1] != 0 || counters[2] != 0 ) {
        	  msg.acknowledge();
          }
        }
        consumer.close();
        sess.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }
}

Other ActiveMQ examples (source code examples)

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