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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Mauricio Salatino<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, January 29, 2010
1:21 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Rules Users List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [rules-users] prevent
infinite loops</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>lock-on-active it's ok
for that kind of situations<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Fri, Jan 29, 2010 at 3:00 PM, Garner, Shawn <<a
href="mailto:Garner.Shawn@principal.com">Garner.Shawn@principal.com</a>>
wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Is there a good way to globally prevent infinite loops.<br>
I had rule A and rule B and they both have FactA on the condition.<br>
They also both modify FactA.<br>
I tried no-loop and it prevents a loop of repeating RuleA over and over.<br>
However it then goes from Rule A back to Rule B back to Rule A.<br>
I fixed it by lock-on-active instead of no-loop.<br>
<br>
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.<br>
<br>
Any guidance would be appreciated.<br>
<br>
Thanks,<br>
SDG<br>
<br>
<br>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
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<br>
-- <br>
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- <a href="http://www.jbug.com.ar">http://www.jbug.com.ar</a><br>
- Salatino "Salaboy" Mauricio -<o:p></o:p></span></font></p>
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