[rules-users] How to improve drools performance?

[Dean Whisnant]

You could create a listener and combine it with a log.  There is org.drools.event.rule.DefaultAgendaEventListener that has two methods I use to log which rule started firing and when the rule completes firing with:

	@Override
	public void beforeActivationFired(BeforeActivationFiredEvent event)
	{
		try
		{
			logFile.write("Package(" + event.getActivation().getRule().getPackageName() + ").Rule(" + event.getActivation().getRule().getName() + ") firing ... ");
		}
		catch (Exception e) { }
	}

	@Override
	public void afterActivationFired(AfterActivationFiredEvent event)
	{
		try
		{
			logFile.write("done!\n");
		}
		catch (Exception e) { }
	}

You could obviously do other logging with time and date stamps, or send it to a database rather than a .log file like I'm doing here.  In my case I get a list of all rules that fire in a fireallrules session.  I can see if a rule fires multiple times, or ends up in an endless loop.

Peace!

Dean

-----Original Message-----
From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of arrehman
Sent: Wednesday, October 12, 2011 1:21 PM
To: rules-users at lists.jboss.org
Subject: [rules-users] How to improve drools performance?

Is there a way to log / monitor the time taken for rule in a Drools rule set?

Is there a way to make sure that one rule is not executed more than once(It seems to be happening in my case)

What are the general guidelines on improving Drools performance?

Currently I am using a one single DRL file with 100 odd rules. 

Any additiional information you need will be provided.

Thanks, 

Abdul


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