[rules-users] prevent infinite loops

[Quinn, Dan]

Hey Shawn,

  The fireAllRules() call can take an integer which specifies the
maximum amount of rules which can fire during each call. If the limit is
reached the engine will return, not firing the other rules on the
Agenda(stopping the loop in your case). We've had a similar problem. We
solved it doing two things. First, our application passes in a
threshold. Then, if we hit the limit our application initializes the
WorkingMemoryConsole logger before fireAllRules is called again. That
way we can easily identify which rule(s) are causing the loop.

Hope that helps,
Dan  

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Garner, Shawn
Sent: Friday, January 29, 2010 1:01 PM
To: rules-users at lists.jboss.org
Subject: [rules-users] prevent infinite loops

Is there a good way to globally prevent infinite loops.
I had rule A and rule B and they both have FactA on the condition.
They also both modify FactA.
I tried no-loop and it prevents a loop of repeating RuleA over and over.
However it then goes from Rule A back to Rule B back to Rule A.
I fixed it by lock-on-active instead of no-loop.

However I was wondering if there was either a timeout feature or a
maximum number of times you could set a rule to be executed to error out
on infinite loops.

Any guidance would be appreciated.

Thanks,
SDG


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