gistfile1.java

/**
 * 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 org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQSession;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import javax.jms.*;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * @author <a href="http://www.christianposta.com/blog">Christian Posta</a>
 */
public class OrderingTest {

    private static final String BROKER_URL = "failover:(tcp://127.0.0.1:61616)?initialReconnectDelay=" +
            "100&useExponentialBackOff=false&maxReconnectDelay=10000&maxReconnectAttempts=1&timeout=10";
    BrokerService broker;

    @Before
    public void setUp() throws Exception {
        broker = new BrokerService();
        configure(broker);
        start(broker);
    }

    @After
    public void tearDown() throws Exception {
        stop(broker);
    }

    private void stop(BrokerService broker) throws Exception {
        broker.stop();
        broker.waitUntilStopped();
    }

    private void start(BrokerService broker) throws Exception {
        broker.start();
        broker.waitUntilStarted();
    }

    @Test
    public void testOrdering() throws JMSException, InterruptedException {
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(BROKER_URL);
        factory.setAlwaysSessionAsync(true);

        // set up producer
        Connection producerConnection = factory.createConnection();
        Session producerSession = producerConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination destination = producerSession.createQueue("DA_QUEUE");
        MessageProducer producer = producerSession.createProducer(null);
        producerConnection.start();
        for (int i = 0; i < 30; i++) {
            System.out.println("Send message: " + i);
            producer.send(destination, producerSession.createTextMessage("Message # " + i));
        }

        producer.close();
        producerSession.close();
        producerConnection.close();

        // let's consume...
        Connection consumerConnection = factory.createConnection();
        Session consumerSession = consumerConnection.createSession(false, ActiveMQSession.INDIVIDUAL_ACKNOWLEDGE);
        ActiveMQQueue queue =  new ActiveMQQueue("DA_QUEUE?consumer.prefetchSize=1");
        MessageConsumer consumer = consumerSession.createConsumer(queue);
        consumer.setMessageListener(new MessageListener() {
            @Override
            public void onMessage(Message message) {
                if (message instanceof TextMessage) {



                    try {
                        int count = getCount((TextMessage)message);
                        System.out.println("Count: "  + count);
                        if ((count % 3 == 0) && !message.getJMSRedelivered()) {
                            System.out.println("Will fail for: " + count);
                            throw new RuntimeException("Failed on purpose for: " + count);
                        }else {

                            message.acknowledge();
                            System.out.println("ACK'd message: " + count);
                        }
                    } catch (JMSException e) {
                        System.out.println("Error! ");
                        e.printStackTrace();

                    }

                } else {
                    System.out.println("Got some weird kind of message: " + message.getClass());
                }
            }

            private int getCount(TextMessage message) throws JMSException {
                String[] array = ((TextMessage) message).getText().split(" ");
                return Integer.parseInt(array[array.length - 1]);
            }
        });
        consumerConnection.start();

        TimeUnit.SECONDS.sleep(2);


    }

    private void configure(BrokerService broker) throws Exception {
        configureStore(broker);
        broker.setDeleteAllMessagesOnStartup(true);
        broker.addConnector("tcp://127.0.0.1:61616");
    }

    private void configureStore(BrokerService broker) throws IOException {
        KahaDBPersistenceAdapter store = new KahaDBPersistenceAdapter();
        store.setJournalMaxFileLength(100 * 1024);
        store.setIndexWriteBatchSize(100);
        store.setEnableIndexWriteAsync(true);
        broker.setPersistenceAdapter(store);
    }
}