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ActiveMQ example source code file (StoreBasedCursorTest.java)

This example ActiveMQ source code file (StoreBasedCursorTest.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, brokerservice, brokerservice, date, exception, exception, policyentry, policymap, queue, string, string, stringbuffer, stringbuffer, textmessage, util

The ActiveMQ StoreBasedCursorTest.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;

/**
 * A StoreBasedCursorTest
 *
 */

import java.util.Date;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;

import junit.framework.TestCase;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.usage.SystemUsage;

public class StoreBasedCursorTest extends TestCase {
    protected String bindAddress = "tcp://localhost:60706";
    BrokerService broker;
    ActiveMQConnectionFactory factory;
    Connection connection;
    Session session;
    Queue queue;
    int messageSize = 1024;
    // actual message is messageSize*2, and 4*MessageSize would allow 2 messages be delivered, but the flush of the cache is async so the flush
    // triggered on 2nd message maxing out the usage may not be in effect for the 3rd message to succeed. Making the memory usage more lenient
    // gives the usageChange listener in the cursor an opportunity to kick in.
    int memoryLimit = 12 * messageSize;
    
    protected void setUp() throws Exception {
        super.setUp();
        if (broker == null) {
            broker = new BrokerService();
            broker.setAdvisorySupport(false);
        }
    }

    protected void tearDown() throws Exception {
        super.tearDown();
        if (broker != null) {
            broker.stop();
            broker = null;
        }
    }
    
    protected void start() throws Exception {
        broker.start();
        factory = new ActiveMQConnectionFactory("vm://localhost?jms.alwaysSyncSend=true");
        factory.setWatchTopicAdvisories(false);
        connection = factory.createConnection();
        connection.start();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        queue = session.createQueue("QUEUE." + this.getClass().getName());
    }
    
    protected void stop() throws Exception {
        session.close();
        connection.close();
        broker.stop();
        broker = null;
    }
    
    protected void configureBroker(long memoryLimit, long systemLimit) throws Exception {
        broker.setDeleteAllMessagesOnStartup(true);
        broker.addConnector(bindAddress);
        broker.setPersistent(true);
        
        SystemUsage systemUsage = broker.getSystemUsage();
        systemUsage.setSendFailIfNoSpace(true);
        systemUsage.getMemoryUsage().setLimit(systemLimit);
        
        PolicyEntry policy = new PolicyEntry();
        policy.setProducerFlowControl(true);
        policy.setUseCache(true);
        PolicyMap pMap = new PolicyMap();
        pMap.setDefaultEntry(policy);
        broker.setDestinationPolicy(pMap);
    }
    
    protected String createMessageText(int index) {
        StringBuffer buffer = new StringBuffer(messageSize);
        buffer.append("Message: " + index + " sent at: " + new Date());
        if (buffer.length() > messageSize) {
            return buffer.substring(0, messageSize);
        }
        for (int i = buffer.length(); i < messageSize; i++) {
            buffer.append(' ');
        }
        return buffer.toString();
    }
    
    protected void sendMessages(int deliveryMode) throws Exception {
        start();
        MessageProducer producer = session.createProducer(queue);
        producer.setDeliveryMode(deliveryMode);
        int i =0;
        try {
            for (i = 0; i < 200; i++) {
                TextMessage message = session.createTextMessage(createMessageText(i));
                producer.send(message);
            }
        } catch (javax.jms.ResourceAllocationException e) {
        	e.printStackTrace();
            fail(e.getMessage() + " num msgs = " + i + ". percentUsage = " + broker.getSystemUsage().getMemoryUsage().getPercentUsage());
        }
        stop();
    }
    
    // use QueueStorePrefetch
    public void testTwoUsageEqualPersistent() throws Exception {
        configureBroker(memoryLimit, memoryLimit);
        sendMessages(DeliveryMode.PERSISTENT);
    }
    
    public void testUseCachePersistent() throws Exception {
        int limit = memoryLimit / 2;
        configureBroker(limit, memoryLimit);
        sendMessages(DeliveryMode.PERSISTENT);
    }
    
    public void testMemoryUsageLowPersistent() throws Exception {
        configureBroker(memoryLimit, 10 * memoryLimit);
        sendMessages(DeliveryMode.PERSISTENT);
    }
    
    // use FilePendingMessageCursor
    public void testTwoUsageEqualNonPersistent() throws Exception {
        configureBroker(memoryLimit, memoryLimit);
        sendMessages(DeliveryMode.NON_PERSISTENT);
    }
    
    public void testMemoryUsageLowNonPersistent() throws Exception {
        configureBroker(memoryLimit, 10 * memoryLimit);
        sendMessages(DeliveryMode.NON_PERSISTENT);
    }
}

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