Monitoring Queue using Java

Question

I am trying to monitor a queue without using any API such as Hermes or GEMS i.e. I want to use purely JAVA. SO in order to browse the queue i.e. check if message has reached the queue or not without actually consuming the message I have written below piece of code:

javax.jms.QueueBrowser browser = session.createBrowser(queue);

        Enumeration msgs = browser.getEnumeration();

        int Count=0;

        while(msgs.hasMoreElements())
        {
            message = (javax.jms.Message)msgs.nextElement();
            System.out.println("Message"+message);
            Count++;
        }

However when I am publishing the messages on queue it is not displaying the result. I have verified that messages are reaching the queue and same are being consumed by the receiver. So as this approach was not working I thought to use a different approach which is by counting the numberOfMessages recevied by queue before and after. So I used the below piece of code

QueueInfo q= new QueueInfo(queueName);
    long l=q.getInTransitMessageCount();
    System.out.println("In transit Mesasge Count="+l+"\n");

But this is also not working. Any suggestion or explanation to resolve this problem would be highly appreciated. Please note there is no compilation error in the code and all the necessary classes are imported.

which is the jms provider being used? – Scorpion Jan 05 '12 at 08:20 — Scorpion, Jan 05 '12 at 08:20
@Scorpion I am using Tibco Enterprise Messaging Server – Kapil Jan 05 '12 at 08:41 — Kapil, Jan 05 '12 at 08:41

score 1 · Answer 1 · answered Jan 08 '12 at 23:57

1

The code you are using will count the number of messages in the queue at a single moment in time. Messages posted and then consumed outside this timeslice will not show up and messages are consumed very quickly in most JMS implementations.

When we monitor an active message queue we are only concerned if there are messages in the queue as this means the consumer has stopped or is not consuming fast enough.

If you are trying to count the messages going past then you will need to intercept the messages (ie consume them yourself and post them to another queue).

You might want to give more information about what you really want.

answered Jan 08 '12 at 23:57

David McPaul

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This is what I am trying to achive. We have a process which post messages on a JMS queue after doing some operations. There is another system which is actually consuming the messages. So we need to make sure that our process has worked fine. I know we have monitoring tool like GEMS or Hermes but we need to automate the process, so I was planning to get the count from queue and write it to a file. Any other option, please suggest. – Kapil Jan 09 '12 at 11:21
I would probably have your process maintain some internal counters and expose them as an MBean. Your monitor can query the MBean and reset the values every 1min or so. This gives you a transactions per minute rate. Also any commercial monitoring tool will connect to MBeans. – David McPaul Jan 18 '12 at 05:32
@Vivek Can you expand on your use case? Which party needs to verify delivery? The producing system? The consuming system? Or a completely different monitoring system? – stoft Mar 30 '12 at 22:36

score 0 · Answer 2 · answered Jan 05 '12 at 17:39

0

your browser code seems to be right..check whether you are passing correct queue argument..or just debug and see why that loop is not executed?

answered Jan 05 '12 at 17:39

Ratha

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score 0 · Answer 3 · answered Jan 06 '12 at 10:52

0

QueueBrowser does not need to give you a snapshot. IF you have other consumers on the queue, then they will be draining it, so it's possible that they are being pulled off. Please try turning off your consumer first to see what happens. See [1]

[1] http://docs.oracle.com/javaee/1.3/api/javax/jms/QueueBrowser.html

answered Jan 06 '12 at 10:52

John Ament

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I cannot turn off the receiver as the third party system which is out of my scope is listening on that. if I do that then what is the point of monitoring. – Kapil Jan 07 '12 at 05:18

Monitoring Queue using Java

3 Answers3