ActiveMQ example source code file (LargeStreamletTest.java)

This example ActiveMQ source code file (LargeStreamletTest.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, atomicboolean, atomicboolean, atomicinteger, atomicinteger, exception, exception, io, logger, message_count, random, runnable, should, thread, thread, util

The ActiveMQ LargeStreamletTest.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;

/**
 * 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.
 */

import java.io.InputStream;
import java.io.OutputStream;
import java.util.Random;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

import javax.jms.Destination;
import javax.jms.Session;

import junit.framework.Assert;
import junit.framework.TestCase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author rnewson
 */
public final class LargeStreamletTest extends TestCase {

    private static final Logger LOG = LoggerFactory.getLogger(LargeStreamletTest.class);
    private static final String BROKER_URL = "vm://localhost?broker.persistent=false";
    private static final int BUFFER_SIZE = 1 * 1024;
    private static final int MESSAGE_COUNT = 10 * 1024;

    protected Exception writerException;
    protected Exception readerException;

    private AtomicInteger totalRead = new AtomicInteger();
    private AtomicInteger totalWritten = new AtomicInteger();
    private AtomicBoolean stopThreads = new AtomicBoolean(false);

    public void testStreamlets() throws Exception {
        final ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(BROKER_URL);

        final ActiveMQConnection connection = (ActiveMQConnection)factory.createConnection();
        connection.start();
        try {
            final Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            try {
                final Destination destination = session.createQueue("wibble");
                final Thread readerThread = new Thread(new Runnable() {

                    public void run() {
                        totalRead.set(0);
                        try {
                            final InputStream inputStream = connection.createInputStream(destination);
                            try {
                                int read;
                                final byte[] buf = new byte[BUFFER_SIZE];
                                while (!stopThreads.get() && (read = inputStream.read(buf)) != -1) {
                                    totalRead.addAndGet(read);
                                }
                            } finally {
                                inputStream.close();
                            }
                        } catch (Exception e) {
                            readerException = e;
                            e.printStackTrace();
                        } finally {
                            LOG.info(totalRead + " total bytes read.");
                        }
                    }
                });

                final Thread writerThread = new Thread(new Runnable() {
                    private final Random random = new Random();

                    public void run() {
                        totalWritten.set(0);
                        int count = MESSAGE_COUNT;
                        try {
                            final OutputStream outputStream = connection.createOutputStream(destination);
                            try {
                                final byte[] buf = new byte[BUFFER_SIZE];
                                random.nextBytes(buf);
                                while (count > 0 && !stopThreads.get()) {
                                    outputStream.write(buf);
                                    totalWritten.addAndGet(buf.length);
                                    count--;
                                }
                            } finally {
                                outputStream.close();
                            }
                        } catch (Exception e) {
                            writerException = e;
                            e.printStackTrace();
                        } finally {
                            LOG.info(totalWritten + " total bytes written.");
                        }
                    }
                });

                readerThread.start();
                writerThread.start();

                // Wait till reader is has finished receiving all the messages
                // or he has stopped
                // receiving messages.
                Thread.sleep(1000);
                int lastRead = totalRead.get();
                while (readerThread.isAlive()) {
                    readerThread.join(1000);
                    // No progress?? then stop waiting..
                    if (lastRead == totalRead.get()) {
                        break;
                    }
                    lastRead = totalRead.get();
                }

                stopThreads.set(true);

                assertTrue("Should not have received a reader exception", readerException == null);
                assertTrue("Should not have received a writer exception", writerException == null);

                Assert.assertEquals("Not all messages accounted for", totalWritten.get(), totalRead.get());

            } finally {
                session.close();
            }
        } finally {
            connection.close();
        }
    }

}