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ActiveMQ example source code file (CursorSupport.java)

This example ActiveMQ source code file (CursorSupport.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

activemqconnectionfactory, arraylist, brokerservice, connection, connection, exception, exception, list, message, message_count, message_count, messageconsumer, prefetch_size, prefetch_size, threading, threads, util

The ActiveMQ CursorSupport.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.broker.region.cursors;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.CombinationTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
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;

/**
 * 
 */
public abstract class CursorSupport extends CombinationTestSupport {

    public int MESSAGE_COUNT = 500;
    public int PREFETCH_SIZE = 50;
    private static final Logger LOG = LoggerFactory.getLogger(CursorSupport.class);

    protected BrokerService broker;
    protected String bindAddress = "tcp://localhost:60706";

    protected abstract Destination getDestination(Session session) throws JMSException;

    protected abstract MessageConsumer getConsumer(Connection connection) throws Exception;

    protected abstract void configureBroker(BrokerService answer) throws Exception;

    public void testSendFirstThenConsume() throws Exception {
        ConnectionFactory factory = createConnectionFactory();
        Connection consumerConnection = getConsumerConnection(factory);
        MessageConsumer consumer = getConsumer(consumerConnection);
        consumerConnection.close();
        Connection producerConnection = factory.createConnection();
        producerConnection.start();
        Session session = producerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(getDestination(session));
        List<Message> senderList = new ArrayList();
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            Message msg = session.createTextMessage("test" + i);
            senderList.add(msg);
            producer.send(msg);
        }
        producerConnection.close();
        // now consume the messages
        consumerConnection = getConsumerConnection(factory);
        // create durable subs
        consumer = getConsumer(consumerConnection);
        List<Message> consumerList = new ArrayList();
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            Message msg = consumer.receive(1000*5);
            assertNotNull("Message "+i+" was missing.", msg);
            consumerList.add(msg);
        }
        assertEquals(senderList, consumerList);
        consumerConnection.close();
    }


    public void initCombosForTestSendWhilstConsume() {
        addCombinationValues("MESSAGE_COUNT", new Object[] {Integer.valueOf(400),
                                                           Integer.valueOf(500)});
        addCombinationValues("PREFETCH_SIZE", new Object[] {Integer.valueOf(100),
                Integer.valueOf(50)});
    }

    public void testSendWhilstConsume() throws Exception {
        ConnectionFactory factory = createConnectionFactory();
        Connection consumerConnection = getConsumerConnection(factory);
        // create durable subs
        MessageConsumer consumer = getConsumer(consumerConnection);
        consumerConnection.close();
        Connection producerConnection = factory.createConnection();
        producerConnection.start();
        Session session = producerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(getDestination(session));
        List<TextMessage> senderList = new ArrayList();
        for (int i = 0; i < MESSAGE_COUNT / 10; i++) {
            TextMessage msg = session.createTextMessage("test" + i);
            senderList.add(msg);
            producer.send(msg);
        }
        // now consume the messages
        consumerConnection = getConsumerConnection(factory);
        // create durable subs
        consumer = getConsumer(consumerConnection);
        final List<Message> consumerList = new ArrayList();
        final CountDownLatch latch = new CountDownLatch(1);
        consumer.setMessageListener(new MessageListener() {

            public void onMessage(Message msg) {
                try {
                    // sleep to act as a slow consumer
                    // which will force a mix of direct and polled dispatching
                    // using the cursor on the broker
                    Thread.sleep(50);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                consumerList.add(msg);
                if (consumerList.size() == MESSAGE_COUNT) {
                    latch.countDown();
                }
            }
        });
        for (int i = MESSAGE_COUNT / 10; i < MESSAGE_COUNT; i++) {
            TextMessage msg = session.createTextMessage("test" + i);
            senderList.add(msg);
            producer.send(msg);
        }
        latch.await(300000, TimeUnit.MILLISECONDS);
        producerConnection.close();
        consumerConnection.close();
        assertEquals("Still dipatching - count down latch not sprung", latch.getCount(), 0);
        //assertEquals("cosumerList - expected: " + MESSAGE_COUNT + " but was: " + consumerList.size(), consumerList.size(), senderList.size());
        for (int i = 0; i < senderList.size(); i++) {
            Message sent = senderList.get(i);
            Message consumed = consumerList.get(i);
            if (!sent.equals(consumed)) {
                LOG.error("BAD MATCH AT POS " + i);
                LOG.error(sent.toString());
                LOG.error(consumed.toString());
                /*
                 * log.error("\n\n\n\n\n"); for (int j = 0; j <
                 * consumerList.size(); j++) { log.error(consumerList.get(j)); }
                 */
            }
            assertEquals("This should be the same at pos " + i + " in the list", sent.getJMSMessageID(), consumed.getJMSMessageID());
        }
    }
    
    protected Connection getConsumerConnection(ConnectionFactory fac) throws JMSException {
        Connection connection = fac.createConnection();
        connection.setClientID("testConsumer");
        connection.start();
        return connection;
    }

    protected void setUp() throws Exception {
        if (broker == null) {
            broker = createBroker();
        }
        super.setUp();
    }

    protected void tearDown() throws Exception {
        super.tearDown();
        if (broker != null) {
            broker.stop();
        }
    }

    protected ActiveMQConnectionFactory createConnectionFactory() throws Exception {
        ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory(bindAddress);
        Properties props = new Properties();
        props.setProperty("prefetchPolicy.durableTopicPrefetch", "" + PREFETCH_SIZE);
        props.setProperty("prefetchPolicy.optimizeDurableTopicPrefetch", "" + PREFETCH_SIZE);
        props.setProperty("prefetchPolicy.queuePrefetch", "" + PREFETCH_SIZE);
        cf.setProperties(props);
        return cf;
    }

    protected BrokerService createBroker() throws Exception {
        BrokerService answer = new BrokerService();
        configureBroker(answer);
        answer.start();
        return answer;
    }
}

Other ActiveMQ examples (source code examples)

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