sending a message to activemq - Java Message

Java examples for Message:JMS

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Description

sending a message to activemq

Demo Code

package com.dreamlabs.activemq;
/*/*w  ww .  ja va  2 s  .  co  m*/
 *  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 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;

import org.apache.activemq.ActiveMQConnectionFactory;

/**
 * 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();
  }
}

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