switch Tibco RV to WebSphere MQ?

Question

My application is listening to Tibco RV, now I am required to switch to WebSphere MQ. I found the code like this

Tibrv.open(Tibrv.IMPL_NATIVE);
rvdTransport = new TibrvRvdTransport(...);
TibrvQueue queue = new TibrvQueue();
cmqTransport = new TibrvCmQueueTransport(...);
queueListener = new TibrvCmListener(...);
disp = new TibrvDispatcher(...)

In the MQ side, do we have similar concepts?

Thanks

Answer 1

Short answer - Yes.

When you download and install the WMQ client (SupportPac MQC71) you get, in addition to the Java classes, diagnostic utilities and lots of sample code. Among the sample programs you will find MQSample.java which looks like this:

import com.ibm.mq.MQException;
import com.ibm.mq.MQGetMessageOptions;
import com.ibm.mq.MQMessage;
import com.ibm.mq.MQPutMessageOptions;
import com.ibm.mq.MQQueue;
import com.ibm.mq.MQQueueManager;
import com.ibm.mq.constants.MQConstants;

public class MQSample {
  public static void main(String args[]) {
    try {
      // Create a connection to the QueueManager
      System.out.println("Connecting to queue manager: " + qManager);
      MQQueueManager qMgr = new MQQueueManager(qManager);

      // Set up the options on the queue we wish to open
      int openOptions = MQConstants.MQOO_INPUT_AS_Q_DEF | MQConstants.MQOO_OUTPUT;

      // Now specify the queue that we wish to open and the open options
      System.out.println("Accessing queue: " + qName);
      MQQueue queue = qMgr.accessQueue(qName, openOptions);

      // Define a simple WebSphere MQ Message ...
      MQMessage msg = new MQMessage();
      // ... and write some text in UTF8 format
      msg.writeUTF("Hello, World!");

      // Specify the default put message options
      MQPutMessageOptions pmo = new MQPutMessageOptions();

      // Put the message to the queue
      System.out.println("Sending a message...");
      queue.put(msg, pmo);

      // Now get the message back again. First define a WebSphere MQ
      // message
      // to receive the data
      MQMessage rcvMessage = new MQMessage();

      // Specify default get message options
      MQGetMessageOptions gmo = new MQGetMessageOptions();

      // Get the message off the queue.
      System.out.println("...and getting the message back again");
      queue.get(rcvMessage, gmo);

      // And display the message text...
      String msgText = rcvMessage.readUTF();
      System.out.println("The message is: " + msgText);

      // Close the queue
      System.out.println("Closing the queue");
      queue.close();

      // Disconnect from the QueueManager
      System.out.println("Disconnecting from the Queue Manager");
      qMgr.disconnect();
      System.out.println("Done!");
    }
    catch (MQException ex) {
      System.out.println("A WebSphere MQ Error occured : Completion Code " + ex.completionCode
          + " Reason Code " + ex.reasonCode);
      ex.printStackTrace();
      for (Throwable t = ex.getCause(); t != null; t = t.getCause()) {
        System.out.println("... Caused by ");
        t.printStackTrace();
      }

    }
    catch (java.io.IOException ex) {
      System.out.println("An IOException occured whilst writing to the message buffer: " + ex);
    }
    return;
  }
}

There are of course also samples for JMS, C, C#, etc. The sample shown uses synchronous (blocking) GET calls but there are async listener methods if you want to implement with a callback mechanism.

I would also recommend looking over the application development sections of the Infocenter. These are the v7.0 docs and these are the v7.1 docs.