Sender.

Enterprise Java
Guarantee Inter-Enterprise Message Delivery Using JMS
Gopalan Suresh Raj
Listing 8. Sender.


import javax.jms.*;
import fiorano.jms.rtl.FioranoInitialContext;

public class Sender {
  
  String m_customerID; // Account ID of this customer

  QueueSession m_queueSession;
  QueueSender m_buySender;
  QueueSender m_sellSender;

  public Sender (String customerID) {
    m_customerID = customerID;
  }

  public void finalize () {
    try {
      m_queueSession.close();
      m_buySender.close();
      m_sellSender.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public void TalkToYourStockBroker () {
    try {

      //  1. Create the InitialContext Object used for looking up
      //     JMS administered objects on the Fiorano/EMS
      //     located on the default host.
      //

      FioranoInitialContext initialCtx = null;
      initialCtx = new FioranoInitialContext ();
      initialCtx.bind ();


      // 1.1  Lookup Connection Factory and Queue names

      QueueConnectionFactory queueConnFactory =
                     (QueueConnectionFactory) initialCtx.lookup ("primaryQCF");
      Queue buyQueue = (Queue)initialCtx.lookup("Buy_Queue");
      Queue sellQueue = (Queue)initialCtx.lookup("Sell_Queue");


      // 1.2  Dispose the InitialContext resources

      initialCtx.dispose();


      // 2. create and start a queue connection

      System.out.println("Creating Queue connections");
      QueueConnection queueConnection =
              queueConnFactory.createQueueConnection();
      queueConnection.start ();


      // 3. create queue session on the connection just created

      System.out.println
                   ("Creating queue session: not transacted, auto ack");
      m_queueSession = queueConnection.createQueueSession
                            (false, Session.AUTO_ACKNOWLEDGE);


      // 4. create senders for the Queue

      System.out.println("Creating Queue, senders");
      m_buySender = m_queueSession.createSender(buyQueue);
      m_sellSender = m_queueSession.createSender(sellQueue);
    }
    catch (Exception e) {
      e.printStackTrace ();
    }
  }

  void SellStocks (String symbol, int sellNumStocks, double price) {
    try {

     // 5. Create a text message

     TextMessage textmsg = m_queueSession.createTextMessage();
      textmsg.setText ("Customer ID :"+ m_customerID + ". Sell "+
              sellNumStocks + " stocks of " + symbol+	" at $" + price);

      // Set and Publish the message

      m_sellSender.send(textmsg, DeliveryMode.PERSISTENT, 5, 0);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public void BuyStocks(String symbol, int buyNumStocks, double price){
    try {

      // 5. Create a text message

      TextMessage textmsg = m_queueSession.createTextMessage();
      textmsg.setText ("Customer ID :"+ m_customerID + ". Buy "+
              buyNumStocks + " stocks of " +symbol+ " at $"+ price);

      // Set and Publish the message

      m_buySender.send(textmsg, DeliveryMode.PERSISTENT, 5, 0);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

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