Hi Ron,
 
yes I do create a new working memory each time. In the middle of testing the change, I'll let you know the outcome.
 
Cheers,
Matt.

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Ronald R. DiFrango
Sent: Tuesday, 24 April 2007 4:25 AM
To: Rules Users List
Subject: Re: [rules-users] Potential memory problems

Matt,

I am sure that would work, but I wonder are you building a new working memory each time as well?  If not then maybe you should.  My methods always look something like the following:

{
    final WorkingMemory workingMemory = ruleBase.newWorkingMemory();
    // Assert my objects
    workingMemory.assertObject(object);
    // Fire the rules
    workingMemory.fireAllRules();
    // Return what ever you need to
    return result;
}

That way WorkingMemory is thrown away each time.  Also, it is fairly low overhead to create one each time.  Especially given that you clear and dispose each.

Ron

On 4/23/07, Matthew Shaw <mshaw@emergency.qld.gov.au> wrote:

Hi,

I am fronting my rule engine by a stateless session façade bean, running in a weblogic container. The rule bases are loaded only once via a singleton.

I was running a profiler over the app and have noticed a lot of rule engine objects still attached to the tree. My stub which invokes the working memory looks like the following:

try {
        handle = wm.assertObject(shift);
        wm.assertObject(shiftCalculator);
        wm.fireAllRules();
} catch (RuntimeDroolsException e) {
        throw new TimesheetServiceUnavailableException(
                                        "Could not add shift to Working Memory", e);
}
wm.clearAgenda();
wm.dispose();
LoggingUtils.logMethodFinish(logger, methodName);

As you can see if an exception occurs then the dispose method is not run. Could this lead to memory leakage?

I have subsequently modified the offending stub to include a finally block

finally {
        wm.clearAgenda();
        wm.dispose();
        LoggingUtils.logMethodFinish( logger, methodName);
}

Matt Shaw
Snr Applications Developer
Service Performance & Management Unit
Phone: 3247 8666. ext. 94666

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