ActiveMQ example source code file (LargeMessageTestSupport.java)

This example ActiveMQ source code file (LargeMessageTestSupport.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

atomicinteger, bytesmessage, bytesmessage, connection, destination, exception, exception, idgenerator, large_message_size, large_message_size, message_count, message_count, messageconsumer, session

The ActiveMQ LargeMessageTestSupport.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.concurrent.atomic.AtomicInteger;

import javax.jms.BytesMessage;
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.Topic;

import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.util.IdGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class LargeMessageTestSupport extends ClientTestSupport implements MessageListener {

    protected static final int LARGE_MESSAGE_SIZE = 128 * 1024;
    protected static final int MESSAGE_COUNT = 100;

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

    protected Connection producerConnection;
    protected Connection consumerConnection;
    protected MessageConsumer consumer;
    protected MessageProducer producer;
    protected Session producerSession;
    protected Session consumerSession;
    protected byte[] largeMessageData;
    protected Destination destination;
    protected boolean isTopic = true;
    protected boolean isDurable = true;
    protected int deliveryMode = DeliveryMode.PERSISTENT;
    protected IdGenerator idGen = new IdGenerator();
    protected boolean validMessageConsumption = true;
    protected AtomicInteger messageCount = new AtomicInteger(0);

    protected int prefetchValue = 10000000;

    protected Destination createDestination() {
        String subject = getClass().getName();
        if (isTopic) {
            return new ActiveMQTopic(subject);
        } else {
            return new ActiveMQQueue(subject);
        }
    }

    protected MessageConsumer createConsumer() throws JMSException {
        if (isTopic && isDurable) {
            return consumerSession.createDurableSubscriber((Topic)destination, idGen.generateId());
        } else {
            return consumerSession.createConsumer(destination);
        }
    }

    public void setUp() throws Exception {
        super.setUp();
        ClientTestSupport.removeMessageStore();
        LOG.info("Setting up . . . . . ");
        messageCount.set(0);

        destination = createDestination();
        largeMessageData = new byte[LARGE_MESSAGE_SIZE];
        for (int i = 0; i < LARGE_MESSAGE_SIZE; i++) {
            if (i % 2 == 0) {
                largeMessageData[i] = 'a';
            } else {
                largeMessageData[i] = 'z';
            }
        }

        try {
            // allow the broker to start
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            throw new JMSException(e.getMessage());
        }

        ActiveMQConnectionFactory fac = getConnectionFactory();
        producerConnection = fac.createConnection();
        setPrefetchPolicy((ActiveMQConnection)producerConnection);
        producerConnection.start();

        consumerConnection = fac.createConnection();
        setPrefetchPolicy((ActiveMQConnection)consumerConnection);
        consumerConnection.setClientID(idGen.generateId());
        consumerConnection.start();
        producerSession = producerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        producer = producerSession.createProducer(createDestination());
        producer.setDeliveryMode(deliveryMode);
        consumerSession = consumerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        consumer = createConsumer();
        consumer.setMessageListener(this);
        LOG.info("Setup complete");
    }

    protected void setPrefetchPolicy(ActiveMQConnection activeMQConnection) {
        activeMQConnection.getPrefetchPolicy().setTopicPrefetch(prefetchValue);
        activeMQConnection.getPrefetchPolicy().setQueuePrefetch(prefetchValue);
        activeMQConnection.getPrefetchPolicy().setDurableTopicPrefetch(prefetchValue);
        activeMQConnection.getPrefetchPolicy().setQueueBrowserPrefetch(prefetchValue);
        activeMQConnection.getPrefetchPolicy().setOptimizeDurableTopicPrefetch(prefetchValue);
    }

    public void tearDown() throws Exception {
        Thread.sleep(1000);
        producerConnection.close();
        consumerConnection.close();

        super.tearDown();

        largeMessageData = null;
    }

    protected boolean isSame(BytesMessage msg1) throws Exception {
        boolean result = false;
        ((ActiveMQMessage)msg1).setReadOnlyBody(true);

        for (int i = 0; i < LARGE_MESSAGE_SIZE; i++) {
            result = msg1.readByte() == largeMessageData[i];
            if (!result) {
                break;
            }
        }

        return result;
    }

    public void onMessage(Message msg) {
        try {
            BytesMessage ba = (BytesMessage)msg;
            validMessageConsumption &= isSame(ba);
            assertTrue(ba.getBodyLength() == LARGE_MESSAGE_SIZE);
            if (messageCount.incrementAndGet() >= MESSAGE_COUNT) {
                synchronized (messageCount) {
                    messageCount.notify();
                }
            }
            LOG.info("got message = " + messageCount);
            if (messageCount.get() % 50 == 0) {
                LOG.info("count = " + messageCount);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void testLargeMessages() throws Exception {
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            LOG.info("Sending message: " + i);
            BytesMessage msg = producerSession.createBytesMessage();
            msg.writeBytes(largeMessageData);
            producer.send(msg);
        }
        long now = System.currentTimeMillis();
        while (now + 60000 > System.currentTimeMillis() && messageCount.get() < MESSAGE_COUNT) {
            LOG.info("message count = " + messageCount);
            synchronized (messageCount) {
                messageCount.wait(1000);
            }
        }
        LOG.info("Finished count = " + messageCount);
        assertTrue("Not enough messages - expected " + MESSAGE_COUNT + " but got " + messageCount, messageCount.get() == MESSAGE_COUNT);
        assertTrue("received messages are not valid", validMessageConsumption);
        Thread.sleep(1000);
        LOG.info("FINAL count = " + messageCount);
    }
}