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ActiveMQ example source code file (JmsConsumerResetActiveListenerTest.java)

This example ActiveMQ source code file (JmsConsumerResetActiveListenerTest.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

atomicboolean, atomicboolean, countdownlatch, exception, first, first, messageconsumer, messagelistener, messageproducer, second, textmessage, textmessage, threading, threads, util, vector, vector

The ActiveMQ JmsConsumerResetActiveListenerTest.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;

import java.util.Vector;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

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 junit.framework.TestCase;


public class JmsConsumerResetActiveListenerTest extends TestCase {

    private Connection connection;
    private ActiveMQConnectionFactory factory;
   
    protected void setUp() throws Exception {
        factory = new ActiveMQConnectionFactory("vm://localhost?broker.persistent=false");
        connection = factory.createConnection();
    }

    protected void tearDown() throws Exception {
        if (connection != null) {
            connection.close();
            connection = null;
        }
    }
    
    /**
     * verify the (undefined by spec) behaviour of setting a listener while receiving a message.
     * 
     * @throws Exception
     */
    public void testSetListenerFromListener() throws Exception {
        Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        Destination dest = session.createQueue("Queue-" + getName());
        final MessageConsumer consumer = session.createConsumer(dest);
       
        final CountDownLatch latch = new CountDownLatch(2);
        final AtomicBoolean first = new AtomicBoolean(true);
        final Vector<Object> results = new Vector();
        consumer.setMessageListener(new MessageListener() {

            public void onMessage(Message message) {
                if (first.compareAndSet(true, false)) {
                    try {
                        consumer.setMessageListener(this);
                        results.add(message);
                    } catch (JMSException e) {
                        results.add(e);
                    }
                } else {
                    results.add(message);
                }
                latch.countDown();
            }
        });

        connection.start();
        
        MessageProducer producer = session.createProducer(dest);
        producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
        producer.send(session.createTextMessage("First"));
        producer.send(session.createTextMessage("Second"));
        
        assertTrue("we did not timeout", latch.await(5, TimeUnit.SECONDS));
        
        assertEquals("we have a result", 2, results.size());
        Object result = results.get(0);
        assertTrue(result instanceof TextMessage);
        assertEquals("result is first", "First", ((TextMessage)result).getText());
        result = results.get(1);
        assertTrue(result instanceof TextMessage);
        assertEquals("result is first", "Second", ((TextMessage)result).getText());
    }
    
    /**
     * and a listener on a new consumer, just in case.
      *
     * @throws Exception
     */
    public void testNewConsumerSetListenerFromListener() throws Exception {
        final Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        final Destination dest = session.createQueue("Queue-" + getName());
        final MessageConsumer consumer = session.createConsumer(dest);
       
        final CountDownLatch latch = new CountDownLatch(2);
        final AtomicBoolean first = new AtomicBoolean(true);
        final Vector<Object> results = new Vector();
        consumer.setMessageListener(new MessageListener() {

            public void onMessage(Message message) {
                if (first.compareAndSet(true, false)) {
                    try {
                        MessageConsumer anotherConsumer = session.createConsumer(dest);
                        anotherConsumer.setMessageListener(this);
                        results.add(message);
                    } catch (JMSException e) {
                        results.add(e);
                    }
                } else {
                    results.add(message);
                }
                latch.countDown();
            }
        });

        connection.start();
        
        MessageProducer producer = session.createProducer(dest);
        producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
        producer.send(session.createTextMessage("First"));
        producer.send(session.createTextMessage("Second"));
        
        assertTrue("we did not timeout", latch.await(5, TimeUnit.SECONDS));
        
        assertEquals("we have a result", 2, results.size());
        Object result = results.get(0);
        assertTrue(result instanceof TextMessage);
        assertEquals("result is first", "First", ((TextMessage)result).getText());
        result = results.get(1);
        assertTrue(result instanceof TextMessage);
        assertEquals("result is first", "Second", ((TextMessage)result).getText());
    }
 }

Other ActiveMQ examples (source code examples)

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