Network Deployment (Distributed operating systems), v8.0 > Reference > Developer examples

Example: Programmatically configuring a resource for the default messaging provider

In this example, a JMS connection to a service integration bus is created by using the API in the com.ibm.websphere.sib package. This is an alternative to using JNDI to look up administratively configured connection factories. After the connection is established, the example reads lines of input from the console and sends them as JMS text messages to the specified destination.

Example

This example can be run as a thin client application, or as a stand-alone client application.

/*
 * Sample program
 * © COPYRIGHT International Business Machines Corp. 2009
 * All Rights Reserved * Licensed Materials - Property of IBM  *
 * This sample program is provided AS IS and may be used, executed,  * copied and modified without royalty payment by customer
 *
 * (a) for its own instruction and study,  * (b) in order to develop applications designed to run with an IBM  *     WebSphere product for the customer's own internal use.
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import com.ibm.websphere.sib.api.jms.JmsConnectionFactory;
import com.ibm.websphere.sib.api.jms.JmsFactoryFactory;
import com.ibm.websphere.sib.api.jms.JmsQueue;
import com.ibm.websphere.sib.api.jms.JmsTopic;

/**
 * Sample code to programmatically create a connection to a bus and
  *  send a text message.
 *
 * Example command lines:
 *   SIBusSender topic://my/topic?topicSpace=Default.Topic.Space MyBus localhost:7276
 *   SIBusSender queue://myQueue MyBus localhost:7286:BootstrapSecureMessaging InboundSecureMessaging
 */
public class SIBusSender {

  /**
   * @param args DEST_URL,BUS_NAME,PROVIDER_ENDPOINTS,[TRANSPORT_CHAIN]
   */
  public static void main(String[] args) throws JMSException, IOException {

    // Parse the arguments
    if (args.length
< 3) {
      throw new IllegalArgumentException(
          "Usage: SIBusSender
<DEST_URL>
<BUS_NAME>
<PROVIDER_ENDPOINTS> [TARGET_TRANSPORT_CHAIN]");
    }
    String destUrl = args[0];
    String busName = args[1];
    String providerEndpoints = args[2];
    String targetTransportChain = "InboundBasicMessaging";
    if (args.length >= 4) targetTransportChain = args[3];

    // Obtain the factory factory
    JmsFactoryFactory jmsFact = JmsFactoryFactory.getInstance();

    // Create a JMS destination
    Destination dest;
    if (destUrl.startsWith("topic://")) {
      JmsTopic topic = jmsFact.createTopic(destUrl);

     // Setter methods could be called here to configure the topic
      dest = topic ;
    }
    else {
      JmsQueue queue = jmsFact.createQueue(destUrl);
      // Setter methods could be called here to configure the queue
      dest = queue;
    }
 
    // Create a unified JMS connection factory
    JmsConnectionFactory connFact = jmsFact.createConnectionFactory();

    // Configure the connection factory
    connFact.setBusName(busName);
    connFact.setProviderEndpoints(providerEndpoints);
    connFact.setTargetTransportChain(targetTransportChain);

    // Create the connection
    Connection conn = connFact.createConnection();

    Session session = null;
    MessageProducer producer = null;
    try {


     // Create a session
      session = conn.createSession(false, // Not transactional
                                   Session.AUTO_ACKNOWLEDGE);

      // Create a message producer
      producer = session.createProducer(dest);

      // Loop reading lines of text from the console to send
      .println("Ready to send to " + dest + " on bus " + busName);
      BufferedReader lineInput = new BufferedReader(new InputStreamReader(System.in));
      String line = lineInput.readLine();
      while (line != null && line.length() > 0) {
 
        // Create a text message containing the line
TextMessage message = session.createTextMessage();
        message.setText(line);
 
        // Send the message
producer.send(message,

     Message.DEFAULT_DELIVERY_MODE,

     Message.DEFAULT_PRIORITY,

     Message.DEFAULT_TIME_TO_LIVE); 
 
        // Read the next line
line = lineInput.readLine();
      }

    }
    // Finally block to ensure we close our JMS objects
    finally {

      // Close the message producer
      try {
        if (producer != null) producer.close();
      }
      catch (JMSException e) {
        System.err.println("Failed to close message producer: " + e);
      }


     // Close the session
      try {
        if (session != null) session.close();
      }
      catch (JMSException e) {
        System.err.println("Failed to close session: " + e);
      }

      // Close the connection
      try {
        conn.close();
      }
      catch (JMSException e) {
        System.err.println("Failed to close connection: " + e);
      }

    }
  }

}

Program to use JMS and messaging directly
Run Java thin client applications
Use JMS from stand-alone clients to interoperate with service integration resources

Related

Additional Application Programming Interfaces (APIs)

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