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ActiveMQ example source code file (DeadLetterTestSupport.java)

This example ActiveMQ source code file (DeadLetterTestSupport.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, consuming, destination, destination, exception, exception, jmsexception, jmsexception, messageconsumer, policyentry, regionbroker, string, textmessage, textmessage

The ActiveMQ DeadLetterTestSupport.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.policy;

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.MessageProducer;
import javax.jms.Queue;
import javax.jms.QueueBrowser;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

import org.apache.activemq.TestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.DestinationStatistics;
import org.apache.activemq.broker.region.RegionBroker;
import org.apache.activemq.broker.region.policy.DeadLetterStrategy;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public abstract class DeadLetterTestSupport extends TestSupport {
    private static final Logger LOG = LoggerFactory.getLogger(DeadLetterTestSupport.class);

    protected int messageCount = 10;
    protected long timeToLive;
    protected Connection connection;
    protected Session session;
    protected MessageConsumer consumer;
    protected MessageProducer producer;
    protected int deliveryMode = DeliveryMode.PERSISTENT;
    protected boolean durableSubscriber;
    protected Destination dlqDestination;
    protected MessageConsumer dlqConsumer;
    protected QueueBrowser dlqBrowser;
    protected BrokerService broker;
    protected boolean transactedMode;
    protected int acknowledgeMode = Session.CLIENT_ACKNOWLEDGE;
    private Destination destination;

    protected void setUp() throws Exception {
        super.setUp();
        broker = createBroker();
        broker.start();
        connection = createConnection();
        connection.setClientID(createClientId());

        session = connection.createSession(transactedMode, acknowledgeMode);
        connection.start();
    }

    protected String createClientId() {
        return toString();
    }

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

    protected abstract void doTest() throws Exception;

    protected BrokerService createBroker() throws Exception {
        BrokerService broker = new BrokerService();
        broker.setPersistent(false);
        PolicyEntry policy = new PolicyEntry();
        DeadLetterStrategy defaultDeadLetterStrategy = policy.getDeadLetterStrategy();
        if(defaultDeadLetterStrategy!=null) {
            defaultDeadLetterStrategy.setProcessNonPersistent(true);
        }
        PolicyMap pMap = new PolicyMap();
        pMap.setDefaultEntry(policy);
        broker.setDestinationPolicy(pMap);
        return broker;
    }

    protected void makeConsumer() throws JMSException {
        Destination destination = getDestination();
        LOG.info("Consuming from: " + destination);
        if (durableSubscriber) {
            consumer = session.createDurableSubscriber((Topic)destination, destination.toString());
        } else {
            consumer = session.createConsumer(destination);
        }
    }

    protected void makeDlqConsumer() throws JMSException {
        dlqDestination = createDlqDestination();

        LOG.info("Consuming from dead letter on: " + dlqDestination);
        dlqConsumer = session.createConsumer(dlqDestination);
    }
    
    protected void makeDlqBrowser() throws JMSException {
        dlqDestination = createDlqDestination();

        LOG.info("Browsing dead letter on: " + dlqDestination);
        dlqBrowser = session.createBrowser((Queue)dlqDestination);    	
    }

    protected void sendMessages() throws JMSException {
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        producer = session.createProducer(getDestination());
        producer.setDeliveryMode(deliveryMode);
        producer.setTimeToLive(timeToLive);

        LOG.info("Sending " + messageCount + " messages to: " + getDestination());
        for (int i = 0; i < messageCount; i++) {
            Message message = createMessage(session, i);
            producer.send(message);
        }
    }

    protected TextMessage createMessage(Session session, int i) throws JMSException {
        return session.createTextMessage(getMessageText(i));
    }

    protected String getMessageText(int i) {
        return "message: " + i;
    }

    protected void assertMessage(Message message, int i) throws Exception {
        LOG.info("Received message: " + message);
        assertNotNull("No message received for index: " + i, message);
        assertTrue("Should be a TextMessage not: " + message, message instanceof TextMessage);
        TextMessage textMessage = (TextMessage)message;
        assertEquals("text of message: " + i, getMessageText(i), textMessage.getText());
    }

    protected abstract Destination createDlqDestination();

    public void testTransientTopicMessage() throws Exception {
        super.topic = true;
        deliveryMode = DeliveryMode.NON_PERSISTENT;
        durableSubscriber = true;
        doTest();
    }

    public void testDurableTopicMessage() throws Exception {
        super.topic = true;
        deliveryMode = DeliveryMode.PERSISTENT;
        durableSubscriber = true;
        doTest();
    }

    public void testTransientQueueMessage() throws Exception {
        super.topic = false;
        deliveryMode = DeliveryMode.NON_PERSISTENT;
        durableSubscriber = false;
        doTest();
        validateConsumerPrefetch(this.getDestinationString(), 0);        
    }
        
    public void testDurableQueueMessage() throws Exception {
        super.topic = false;
        deliveryMode = DeliveryMode.PERSISTENT;
        durableSubscriber = false;
        doTest();
        validateConsumerPrefetch(this.getDestinationString(), 0);
    }

    public Destination getDestination() {
        if (destination == null) {
            destination = createDestination();
        }
        return destination;
    }
    
    private void validateConsumerPrefetch(String destination, long expectedCount) {
        RegionBroker regionBroker = (RegionBroker) broker.getRegionBroker();
        for (org.apache.activemq.broker.region.Destination dest : regionBroker.getQueueRegion().getDestinationMap().values()) {
            if (dest.getName().equals(destination)) {
                DestinationStatistics stats = dest.getDestinationStatistics();
                LOG.info("inflight for : " + dest.getName() + ": " + stats.getInflight().getCount());
                assertEquals("inflight for: " + dest.getName() + ": " + stats.getInflight().getCount() + " matches", 
                        expectedCount, stats.getInflight().getCount());      
            }
        }
    }
}

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