ActiveMQ example source code file (NoDuplicateOnTopicNetworkTest.java)

This example ActiveMQ source code file (NoDuplicateOnTopicNetworkTest.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

broker_3, brokerservice, brokerservice, countdownlatch, exception, exception, jmsexception, jmsexception, net, network, string, string, textmessage, thread, threading, threads, topicwithduplicatemessages, unexpected, util

The ActiveMQ NoDuplicateOnTopicNetworkTest.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.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import javax.jms.Connection;
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 javax.jms.Topic;

import junit.framework.Test;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.CombinationTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.DispatchPolicy;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.broker.region.policy.PriorityNetworkDispatchPolicy;
import org.apache.activemq.broker.region.policy.SimpleDispatchPolicy;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.network.NetworkConnector;
import org.apache.activemq.util.Wait;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class NoDuplicateOnTopicNetworkTest extends CombinationTestSupport {
    private static final Logger LOG = LoggerFactory
            .getLogger(NoDuplicateOnTopicNetworkTest.class);

    private static final String MULTICAST_DEFAULT = "multicast://default";
    private static final String BROKER_1 = "tcp://localhost:61626";
    private static final String BROKER_2 = "tcp://localhost:61636";
    private static final String BROKER_3 = "tcp://localhost:61646";
    private final static String TOPIC_NAME = "broadcast";
    private BrokerService broker1;
    private BrokerService broker2;
    private BrokerService broker3;

    public boolean suppressDuplicateTopicSubs = false;
    public DispatchPolicy dispatchPolicy = new SimpleDispatchPolicy();
    
    private boolean dynamicOnly = false;
    // no duplicates in cyclic network if networkTTL <=1
    // when > 1, subscriptions perculate around resulting in duplicates as there is no
    // memory of the original subscription.
    // solution for 6.0 using org.apache.activemq.command.ConsumerInfo.getNetworkConsumerIds()
    private int ttl = 3;
    
    
  
    @Override
    protected void setUp() throws Exception {
        super.setUp();

        broker3 = createAndStartBroker("broker3", BROKER_3);
        Thread.sleep(3000);
        broker2 = createAndStartBroker("broker2", BROKER_2);
        Thread.sleep(3000);
        broker1 = createAndStartBroker("broker1", BROKER_1);
        Thread.sleep(1000);
        
        waitForBridgeFormation();
    }
    
    public static Test suite() {
        return suite(NoDuplicateOnTopicNetworkTest.class);
    }
    
    protected void waitForBridgeFormation() throws Exception {
        Wait.waitFor(new Wait.Condition() {
            public boolean isSatisified() throws Exception {
                return !broker3.getNetworkConnectors().get(0).activeBridges().isEmpty();
            }});
 
        Wait.waitFor(new Wait.Condition() {
            public boolean isSatisified() throws Exception {
                return !broker2.getNetworkConnectors().get(0).activeBridges().isEmpty();
            }});

        Wait.waitFor(new Wait.Condition() {
            public boolean isSatisified() throws Exception {
                return !broker1.getNetworkConnectors().get(0).activeBridges().isEmpty();
            }});
    }

    private BrokerService createAndStartBroker(String name, String addr)
            throws Exception {
        BrokerService broker = new BrokerService();
        broker.setBrokerName(name);
        broker.addConnector(addr).setDiscoveryUri(new URI(MULTICAST_DEFAULT));
        broker.setUseJmx(false);

        NetworkConnector networkConnector = broker
                .addNetworkConnector(MULTICAST_DEFAULT);
        networkConnector.setDecreaseNetworkConsumerPriority(true);
        networkConnector.setDynamicOnly(dynamicOnly);
        networkConnector.setNetworkTTL(ttl);
        networkConnector.setSuppressDuplicateTopicSubscriptions(suppressDuplicateTopicSubs);

        
        PolicyMap policyMap = new PolicyMap();
        PolicyEntry policy = new PolicyEntry();
        policy.setDispatchPolicy(dispatchPolicy);
        // the audit will suppress the duplicates as it defaults to true so this test
        // checking for dups will fail. it is good to have it on in practice.
        policy.setEnableAudit(false);
        policyMap.put(new ActiveMQTopic(TOPIC_NAME), policy);
        broker.setDestinationPolicy(policyMap);
        broker.start();
       
        return broker;
    }

    @Override
    protected void tearDown() throws Exception {
        broker1.stop();
        broker2.stop();
        broker3.stop();
        super.tearDown();
    }

    public void initCombosForTestProducerConsumerTopic() {
        this.addCombinationValues("suppresDuplicateTopicSubs", new Object[]{Boolean.TRUE, Boolean.FALSE});
        this.addCombinationValues("dispatchPolicy", new Object[]{new PriorityNetworkDispatchPolicy(), new SimpleDispatchPolicy()});
    }
    
    public void testProducerConsumerTopic() throws Exception {
        
        final CountDownLatch consumerStarted = new CountDownLatch(1);
        
        Thread producerThread = new Thread(new Runnable() {
            public void run() {
                TopicWithDuplicateMessages producer = new TopicWithDuplicateMessages();
                producer.setBrokerURL(BROKER_1);
                producer.setTopicName(TOPIC_NAME);
                try {
                    producer.produce();
                } catch (JMSException e) {
                    fail("Unexpected " + e);
                }
            }
        });

        final TopicWithDuplicateMessages consumer = new TopicWithDuplicateMessages();
        Thread consumerThread = new Thread(new Runnable() {
            public void run() {
                consumer.setBrokerURL(BROKER_2);
                consumer.setTopicName(TOPIC_NAME);
                try {
                    consumer.consumer();
                    consumerStarted.countDown();
                    consumer.getLatch().await(60, TimeUnit.SECONDS);
                } catch (Exception e) {
                    fail("Unexpected " + e);
                }
            }
        });

        consumerThread.start();
        LOG.info("Started Consumer");
        
        assertTrue("consumer started eventually", consumerStarted.await(10, TimeUnit.SECONDS));
        
        // ensure subscription has percolated though the network
        Thread.sleep(2000);
        
        producerThread.start();
        LOG.info("Started Producer");
        producerThread.join();
        consumerThread.join();

        int duplicateCount = 0;
        Map<String, String> map = new HashMap();
        for (String msg : consumer.getMessageStrings()) {
            if (map.containsKey(msg)) {
                LOG.info("got duplicate: " + msg);
                duplicateCount++;
            }
            map.put(msg, msg);
        }
        if (suppressDuplicateTopicSubs || dispatchPolicy instanceof PriorityNetworkDispatchPolicy) {
            assertEquals("no duplicates", 0, duplicateCount);
            assertEquals("got all required messages: " + map.size(), consumer
                    .getNumMessages(), map.size());
        } else {
            assertTrue("we can get some duplicates: " + duplicateCount, duplicateCount >= 0);
            if (duplicateCount == 0) {
               assertEquals("got all required messages: " + map.size(), consumer
                    .getNumMessages(), map.size()); 
            }
        }
    }

    class TopicWithDuplicateMessages {
        private String brokerURL;
        private String topicName;
        private Connection connection;
        private Session session;
        private Topic topic;
        private MessageProducer producer;
        private MessageConsumer consumer;

        private List<String> receivedStrings = Collections.synchronizedList(new ArrayList());
        private int numMessages = 10;
        private CountDownLatch recievedLatch = new CountDownLatch(numMessages);

        public CountDownLatch getLatch() {
            return recievedLatch;
        }
        
        public List<String> getMessageStrings() {
            synchronized(receivedStrings) {
                return new ArrayList<String>(receivedStrings);
            }
        }

        public String getBrokerURL() {
            return brokerURL;
        }

        public void setBrokerURL(String brokerURL) {
            this.brokerURL = brokerURL;
        }

        public String getTopicName() {
            return topicName;
        }

        public void setTopicName(String topicName) {
            this.topicName = topicName;
        }

        private void createConnection() throws JMSException {
            ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(
                    brokerURL);
            connection = factory.createConnection();
        }

        private void createTopic() throws JMSException {
            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            topic = session.createTopic(topicName);
        }

        private void createProducer() throws JMSException {
            producer = session.createProducer(topic);
        }

        private void createConsumer() throws JMSException {
            consumer = session.createConsumer(topic);
            consumer.setMessageListener(new MessageListener() {

                public void onMessage(Message arg0) {
                    TextMessage msg = (TextMessage) arg0;
                    try {
                        LOG.debug("Received message [" + msg.getText() + "]");
                        receivedStrings.add(msg.getText());
                        recievedLatch.countDown();
                    } catch (JMSException e) {
                        fail("Unexpected :" + e);
                    }
                }

            });
        }

        private void publish() throws JMSException {
            for (int i = 0; i < numMessages; i++) {
                TextMessage textMessage = session.createTextMessage();
                String message = "message: " + i;
                LOG.debug("Sending message[" + message + "]");
                textMessage.setText(message);
                producer.send(textMessage);
            }
        }

        public void produce() throws JMSException {
            createConnection();
            createTopic();
            createProducer();
            connection.start();
            publish();
        }

        public void consumer() throws JMSException {
            createConnection();
            createTopic();
            createConsumer();
            connection.start();
        }

        public int getNumMessages() {
            return numMessages;
        }
    }
}