Folks -
 
After seeing the thread on evals hurting performance a couple of weeks ago, I tried to remove them from a rule set we are using (running Drools 4.0.4), and have had limited success.
 
An example is shown below.  We're using evals every time we make a call to "rulesUtil", a helper class we have for checking strings for keywords.  Two questions:
 
1. Does using inline evals (like below) hurt performance as much as using non-inline evals?
2. If so, any thoughts for how to rewrite this rule to avoid using the eval?
 
 
rule 'my rule'
salience 790
activation-group "priorityRule"
when
ruleUtil : RulesUtil( )
s1 : Sensor( source == "X, $rfp : RFP , eval( ruleUtil.containsKeywordString($rfp, "Y" )) , $tcn : TCN)
s2 : Sensor( TCN != $tcn, source == "Z"
then
System.out.println("my rule");
priority.setPriorityName("A");
 
end
 
Thanks,
David Warren

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Friday, September 05, 2008 2:59 PM
To: Rules Users List
Subject: Re: [rules-users] Drools, Performance issues on 4.0.7 Vs 2.5


   Start by eliminating the evals and writing your constraints properly inside the patterns. Drools 3+ is orders of magnitude faster than Drools 2.x, but you need to leverage its power in your rules. Please read the manual as the version 3 was a completely rewrite of version 2. Version 4 is an improvement over 3.

   As an example, look at this: http://blog.athico.com/2006/11/rush-hour-and-content-based-routing.html

   []s
   Edson

2008/9/5 Rout, Sushanta (ThoughtMill) <Sushanta.Rout@ihg.com>
We were using Drools 2.5 version earlier. Now we have switched to drools
4.0.7. But we see significant issues with performance like drools 4.0.7
is three times slower than 2.5 . Has anybody encountered the issue?

Here is a sample of the rule, we have some more similar to this.
rule "test"
       dialect "java"
       activation-group "group1"
       when
               $croNumberDetailsRequest : CRONumberDetailsRequest()
               $resdirectPhoneNumber : ResdirectPhoneNumber()
               eval($resdirectPhoneNumber.getType().getId() == 5 &&

$resdirectPhoneNumber.isValidForBrand($croNumberDetailsRequest.getBrand(
)) &&
                        $croNumberDetailsRequest.getRegion() != null &&

$resdirectPhoneNumber.isValidRegion($croNumberDetailsRequest.getRegion()
) &&
                        $croNumberDetailsRequest.getLocale() != null &&


$resdirectPhoneNumber.isValidForLocaleId($croNumberDetailsRequest.getLoc
ale()) &&

$resdirectPhoneNumber.isValidSlot($croNumberDetailsRequest.getSlot()));

       then
               ResultList.add($resdirectPhoneNumber);
end

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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com