org.dawnsci.commandserver.mx.example.ActiveMQProducer.java Source code

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Here is the source code for org.dawnsci.commandserver.mx.example.ActiveMQProducer.java

Source

/*
 * Copyright (c) 2012 Diamond Light Source Ltd.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.dawnsci.commandserver.mx.example;

import java.util.Enumeration;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.ObjectMessage;
import javax.jms.Queue;
import javax.jms.QueueBrowser;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.dawnsci.commandserver.core.ConnectionFactoryFacade;
import org.dawnsci.commandserver.mx.beans.SweepBean;

import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Running this playing around example:
 * 
 * 1. Install activemq 5.9 and start it. From cmd window in windows for example:
   C:\ActiveMQ\apache-activemq-5.9.0\bin>set JAVA_HOME=C:\Program Files\Java\jdk1.7.0_51
   C:\ActiveMQ\apache-activemq-5.9.0\bin>activemq
       
   2. Run this main method which sends 
       
   For command servers using activemq, current idea might be to have:
   1. One eclipse product for each consumer, mx multi-xstall, tomo, ncd saxs/waxs.
   2. They may be started and stopped independently using separate code to start the consumers by product.
   3. They use DRMAA code to run things on the cluster and share this code and any other analysis code.
   4. As producer runs it sends message events back to provide progress.
       
 * 
 * @author Matthew Gerring
 *
 */
public class ActiveMQProducer {

    private static boolean REQUIRE_PEAK = false;

    public static void main(String[] args) throws Exception {

        QueueConnectionFactory connectionFactory = ConnectionFactoryFacade
                .createConnectionFactory("tcp://ws097.diamond.ac.uk:61616");
        Connection send = connectionFactory.createConnection();

        Session session = send.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Queue queue = session.createQueue("testQ");

        final MessageProducer producer = session.createProducer(queue);
        producer.setDeliveryMode(DeliveryMode.PERSISTENT);

        Message message = session.createTextMessage("Hello World");
        producer.send(message);

        message = session.createTextMessage("...and another message");
        producer.send(message);

        message = session.createObjectMessage(new TestObjectBean("this could be", "anything"));
        producer.send(message);

        // Test JSON
        SweepBean col = new SweepBean("fred", "d0000000001", 0, 100);

        ObjectMapper mapper = new ObjectMapper();
        String jsonString = mapper.writeValueAsString(col);

        message = session.createTextMessage(jsonString);
        producer.send(message);

        producer.close();
        session.close();
        send.close();

        // Now we peak at the queue
        // If the consumer is not going, the messages should still be there
        if (REQUIRE_PEAK) {
            QueueConnection qCon = connectionFactory.createQueueConnection();
            QueueSession qSes = qCon.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
            queue = qSes.createQueue("testQ");
            qCon.start();

            QueueBrowser qb = qSes.createBrowser(queue);
            Enumeration e = qb.getEnumeration();
            if (e.hasMoreElements())
                System.out.println("Peak at queue:");
            while (e.hasMoreElements()) {
                Message m = (Message) e.nextElement();
                if (m == null)
                    continue;
                if (m instanceof TextMessage) {
                    TextMessage t = (TextMessage) m;
                    System.out.println(t.getText());
                } else if (m instanceof ObjectMessage) {
                    ObjectMessage o = (ObjectMessage) m;
                    System.out.println(o.getObject());
                }
            }

            qb.close();
            qSes.close();
            qCon.close();
        }

    }

}