ActiveMQ example source code file (TopicPublisher.java)

This example ActiveMQ source code file (TopicPublisher.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, data, exception, exception, jmsexception, messagelistener, messageproducer, object, object, string, topic, topic, topicpublisher, topicpublisher, util

The ActiveMQ TopicPublisher.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.
 */
import java.util.Arrays;

import javax.jms.BytesMessage;
import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

import org.apache.activemq.ActiveMQConnectionFactory;

/**
 * Use in conjunction with TopicListener to test the performance of ActiveMQ
 * Topics.
 */
public class TopicPublisher implements MessageListener {

    private static final char[] DATA = "abcdefghijklmnopqrstuvwxyz".toCharArray();

    private final Object mutex = new Object();
    private Connection connection;
    private Session session;
    private MessageProducer publisher;
    private Topic topic;
    private Topic control;

    private String url = "tcp://localhost:61616";
    private int size = 256;
    private int subscribers = 1;
    private int remaining;
    private int messages = 10000;
    private long delay;
    private int batch = 2000;

    private byte[] payload;

    public static void main(String[] argv) throws Exception {
        TopicPublisher p = new TopicPublisher();
        String[] unknown = CommandLineSupport.setOptions(p, argv);
        if (unknown.length > 0) {
            System.out.println("Unknown options: " + Arrays.toString(unknown));
            System.exit(-1);
        }
        p.run();
    }

    private void run() throws Exception {
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(url);
        connection = factory.createConnection();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        topic = session.createTopic("topictest.messages");
        control = session.createTopic("topictest.control");

        publisher = session.createProducer(topic);
        publisher.setDeliveryMode(DeliveryMode.NON_PERSISTENT);

        payload = new byte[size];
        for (int i = 0; i < size; i++) {
            payload[i] = (byte)DATA[i % DATA.length];
        }

        session.createConsumer(control).setMessageListener(this);
        connection.start();

        long[] times = new long[batch];
        for (int i = 0; i < batch; i++) {
            if (i > 0) {
                Thread.sleep(delay * 1000);
            }
            times[i] = batch(messages);
            System.out.println("Batch " + (i + 1) + " of " + batch + " completed in " + times[i] + " ms.");
        }

        long min = min(times);
        long max = max(times);
        System.out.println("min: " + min + ", max: " + max + " avg: " + avg(times, min, max));

        // request shutdown
        publisher.send(session.createTextMessage("SHUTDOWN"));

        connection.stop();
        connection.close();
    }

    private long batch(int msgCount) throws Exception {
        long start = System.currentTimeMillis();
        remaining = subscribers;
        publish();
        waitForCompletion();
        return System.currentTimeMillis() - start;
    }

    private void publish() throws Exception {

        // send events
        BytesMessage msg = session.createBytesMessage();
        msg.writeBytes(payload);
        for (int i = 0; i < messages; i++) {
            publisher.send(msg);
            if ((i + 1) % 1000 == 0) {
                System.out.println("Sent " + (i + 1) + " messages");
            }
        }

        // request report
        publisher.send(session.createTextMessage("REPORT"));
    }

    private void waitForCompletion() throws Exception {
        System.out.println("Waiting for completion...");
        synchronized (mutex) {
            while (remaining > 0) {
                mutex.wait();
            }
        }
    }

    public void onMessage(Message message) {
        synchronized (mutex) {
            System.out.println("Received report " + getReport(message) + " " + --remaining + " remaining");
            if (remaining == 0) {
                mutex.notify();
            }
        }
    }

    Object getReport(Message m) {
        try {
            return ((TextMessage)m).getText();
        } catch (JMSException e) {
            e.printStackTrace(System.out);
            return e.toString();
        }
    }

    static long min(long[] times) {
        long min = times.length > 0 ? times[0] : 0;
        for (int i = 0; i < times.length; i++) {
            min = Math.min(min, times[i]);
        }
        return min;
    }

    static long max(long[] times) {
        long max = times.length > 0 ? times[0] : 0;
        for (int i = 0; i < times.length; i++) {
            max = Math.max(max, times[i]);
        }
        return max;
    }

    static long avg(long[] times, long min, long max) {
        long sum = 0;
        for (int i = 0; i < times.length; i++) {
            sum += times[i];
        }
        sum -= min;
        sum -= max;
        return sum / times.length - 2;
    }

    public void setBatch(int batch) {
        this.batch = batch;
    }

    public void setDelay(long delay) {
        this.delay = delay;
    }

    public void setMessages(int messages) {
        this.messages = messages;
    }

    public void setSize(int size) {
        this.size = size;
    }

    public void setSubscribers(int subscribers) {
        this.subscribers = subscribers;
    }

    public void setUrl(String url) {
        this.url = url;
    }
}