ActiveMQ example source code file (Retailer.java)

This example ActiveMQ source code file (Retailer.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, activemqconnectionfactory, computer, jmsexception, mapmessage, mapmessage, messageconsumer, messageproducer, orderaccepted, retailer, retailer, string, string, thread

The ActiveMQ Retailer.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 org.apache.activemq.ActiveMQConnectionFactory;
import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TemporaryQueue;

/**
 * The Retailer orders computers from the Vendor by sending a message via
 * the VendorOrderQueue. It then syncronously receives the reponse message
 * and reports if the order was successful or not.
 */
public class Retailer implements Runnable {
	private String url;
	private String user;
	private String password;
	
	public Retailer(String url, String user, String password) {
		this.url = url;
		this.user = user;
		this.password = password;
	}
	
	public void run() {
		ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, url);
		try {
			Connection connection = connectionFactory.createConnection();
			
			// The Retailer's session is non-trasacted.
			Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
			Destination vendorOrderQueue = session.createQueue("VendorOrderQueue");
			TemporaryQueue retailerConfirmQueue = session.createTemporaryQueue();
			
			MessageProducer producer = session.createProducer(vendorOrderQueue);
			MessageConsumer replyConsumer = session.createConsumer(retailerConfirmQueue);

			connection.start();

			for (int i = 0; i < 5; i++) {
				MapMessage message = session.createMapMessage();
				message.setString("Item", "Computer(s)");
				int quantity = (int)(Math.random() * 4) + 1;
				message.setInt("Quantity", quantity);
				message.setJMSReplyTo(retailerConfirmQueue);
				producer.send(message);
				System.out.println("Retailer: Ordered " + quantity + " computers.");
				
				MapMessage reply = (MapMessage) replyConsumer.receive();
				if (reply.getBoolean("OrderAccepted")) {
					System.out.println("Retailer: Order Filled");
				} else {
					System.out.println("Retailer: Order Not Filled");
				}
			}
			
			// Send a non-MapMessage to signal the end
			producer.send(session.createMessage());
			
			replyConsumer.close();
			connection.close();
			
		} catch (JMSException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		String url = "tcp://localhost:61616";
		String user = null;
		String password = null;
		
		if (args.length >= 1) {
			url = args[0];
		}
		
		if (args.length >= 2) {
			user = args[1];
		}

		if (args.length >= 3) {
			password = args[2];
		}
		
		Retailer r = new Retailer(url, user, password);
		
		new Thread(r, "Retailer").start();
	}
}