Ways to Calculate Number of Messages in OpenMQ

Question

Hello All,
I was wondering if there is a way to calculate Number of messages already present in a Queue (OpenMQ).
1. One way is to make a synchronized static variable .. On each push increment and on listeners pull decrement it. But it have its own flaws i.e On system shutdown we will loss this info even if the messages exists in the queue. OR if me make it persistent then it will take extra processing time.
Do some body know any other way to do it ? I have to do it using JAVA code.
Kind Regards
Shakeel Abbas

Answer 1

Thank you Nigel,
For others information i am pasting some code here..
import java.io.IOException;
import javax.management.JMException;
import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import com.sun.messaging.AdminConnectionFactory;
import com.sun.messaging.jms.management.server.DestinationAttributes;
import com.sun.messaging.jms.management.server.DestinationType;
import com.sun.messaging.jms.management.server.MQObjectName;
Public Class MonitorQueue
public static void main(String[] args) {
          try {
               ObjectName destMonitorName
               = MQObjectName.createDestinationMonitor(DestinationType.QUEUE, "queueNAme");
               // Create admin connection factory for default host and port (localhost:7676)
                  AdminConnectionFactory acf = new AdminConnectionFactory();
               // Get JMX connector using default user name (admin) and password (admin)
                  JMXConnector jmxc = acf.createConnection("admin","admin");
               // Get MBean server connection
                  MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
                  System.out.println(mbsc.getAttribute(destMonitorName, DestinationAttributes.NUM_MSGS));
          } catch (MalformedObjectNameException e1) {
               // TODO Auto-generated catch block
               e1.printStackTrace();
          } catch (NullPointerException e1) {
               // TODO Auto-generated catch block
               e1.printStackTrace();
          } catch (JMException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
}Stay Happy Cheers
Shakeel Abbas