We have used a “BreadCrumb” fact to avoid this in the past.  We had a situation where there wasn’t a direct loop (rule A triggering rule A) but rather a trifecta of facts (Rule A triggers Rule B which trigger Rule C which triggered Rule A).

To solve for this we created a simple “RuleBreadCrumb” fact that takes a “rule name” as a parameter.  We check for the non-existence of this fact in our WHEN clause (on rules at risk of a loop) and insert the RuleBreadCrumb fact in the THEN statements. 

---

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mauricio Salatino
Sent: Friday, January 29, 2010 1:21 PM
To: Rules Users List
Subject: Re: [rules-users] prevent infinite loops

lock-on-active it's ok for that kind of situations

On Fri, Jan 29, 2010 at 3:00 PM, Garner, Shawn <Garner.Shawn@principal.com> wrote:

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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