ActiveMQ example source code file (UnlimitedEnqueueTest.java)

This example ActiveMQ source code file (UnlimitedEnqueueTest.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, brokerservice, exception, executorservice, filependingqueuemessagestoragepolicy, jmsexception, messageproducer, policyentry, policyentry, policymap, policymap, producer, producer, resourceallocationexception, threading, threads, util

The ActiveMQ UnlimitedEnqueueTest.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.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import javax.jms.BytesMessage;
import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.ResourceAllocationException;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.FilePendingQueueMessageStoragePolicy;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.junit.Before;
import org.junit.Test;

public class UnlimitedEnqueueTest  {

    BrokerService brokerService = null;
    final long numMessages = 50000;
    final long numThreads = 10;

    @Test
    public void testEnqueueIsOnlyLimitedByDisk() throws Exception {
        ExecutorService executor = Executors.newCachedThreadPool();
        for (int i=0; i<numThreads; i++) {
            executor.execute(new Producer(numMessages/numThreads));
        }
        
        executor.shutdown();
        executor.awaitTermination(30*60, TimeUnit.SECONDS);
    }
    
    @Before
    public void createBrokerService() throws Exception {
        brokerService = new BrokerService();
        brokerService.setDeleteAllMessagesOnStartup(true);
        brokerService.setAdvisorySupport(false);
        
        // optional, reduce the usage limit so that spooling will occur faster
        brokerService.getSystemUsage().getMemoryUsage().setLimit(10 * 1024 * 1024);
        PolicyMap policyMap = new PolicyMap();
        List<PolicyEntry> entries = new ArrayList();
        PolicyEntry policy = new PolicyEntry();
        
        // NB: ensure queue cursor limit is below the default 70% usage that the destination will use
        // if they are the same, the queue memory limit and flow control will kick in first
        policy.setCursorMemoryHighWaterMark(20);
        
        // on by default
        //policy.setProducerFlowControl(true);
        policy.setQueue(">");
        
        // policy that will spool references to disk
        policy.setPendingQueuePolicy(new FilePendingQueueMessageStoragePolicy());
        entries.add(policy);
        policyMap.setPolicyEntries(entries);
        brokerService.setDestinationPolicy(policyMap);
        
        brokerService.start();
    }
    
    public class Producer implements Runnable{

        private final long numberOfMessages;

        public Producer(final long n){
            this.numberOfMessages = n;
        }

        public void run(){
            ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(brokerService.getVmConnectorURI());
            try {
                Connection conn = factory.createConnection();
                conn.start();
                for (int i = 0; i < numberOfMessages; i++) {
                    Session session = conn.createSession(false,Session.AUTO_ACKNOWLEDGE);
                    Destination destination = session.createQueue("test-queue");
                    MessageProducer producer = session.createProducer(destination);
                    producer.setDeliveryMode(DeliveryMode.PERSISTENT);
                    BytesMessage message = session.createBytesMessage();
                    byte[] bytes = new byte[1024*10];
                    message.writeBytes(bytes);
                    try {
                        producer.send(message);
                    } catch (ResourceAllocationException e) {
                        e.printStackTrace();
                    }
                    session.close();
                }
            } catch (JMSException e) {
                throw new RuntimeException(e);
            }
        }
    }
}