[rules-users] Re: [drools 4] firing a partial set of rules and consequences - performance

[Geoffrey De Smet]

[Sorry for reposting, didn't notice the original mail did come through 
after all.]

Agenda groups would probably work, but I am worried about the affects on 
performance.
Take this pseudo code, using forward chaining:

fireRules(fastAndSlowRulesAgenda);
for (Fact fact : factList) { // factList is very large
   fact.number++;
   fireRules(fastRulesAgenda);
   // do some stuff(but don't change any facts)
   fact.number--;
}
// at this point all the facts are identical as before the loop
aSingleFact.number++;
fireRules(fastAndSlowRulesAgenda);

The main question is if drools will notice that nothing has changed for 
the slowRules (except for aSingleFact.number) and won't spend time on 
those (except for those that apply to aSingleFact.number).


(For the bigger picture, I have 2 distinct ways of possible improving 
the localsearch algorithm and one of them is to use drools not just to 
evaluate solutions but also generate moves and I wonder if this is 
feasible.)

With kind regards,
Geoffrey De Smet


Mark Proctor wrote:
> latest ruleflow stuff has 'and', 'or' and 'xor' type logic to chose your 
> branch points on a split - would that work for you?
> 
> Mark
> Edson Tirelli wrote:
>>    Geoffrey,
>>
>>    Look at agenda-groups and rule-flows.
>>
>>     []s
>>     Edson
>>
>>
>> 2007/6/15, Geoffrey De Smet <ge0ffrey.spam at gmail.com 
>> <mailto:ge0ffrey.spam at gmail.com>>:
>>
>>     Can I fire a partial set of rules?
>>     Say I have 3 rules: fastRuleA, fastRuleB, slowRuleC.
>>     What's the best way to only fire the group of fastRule1 and fastRule2?
>>     AgendaFilter looks like a good way of doing this, but:
>>
>>     If between 2 rule fires, I change a fact, but change it back to it's
>>     original state, will the rule be not refire, just like if I hadn't
>>     changed it temporary? for example fact1 is used in slowRuleC:
>>     fireAllRules(); // fires slowRuleC
>>     fact1.a++;
>>     fact1.a--;
>>     fireAllRules(); // does not fire slowRuleC?
>>
>>     Does still apply if I fire other rules meanwhile?
>>     fireAllRules(); // fires slowRuleC
>>     fact1.a++;
>>     fireAllRules(notSlowRuleCAgendaFilter); // slowRuleC is ignored
>>     // if I did not filter it out it would have fired of course
>>     fact1.a--;
>>     fireAllRules(); // does not fire slowRuleC? or does it?
>>     // a hasn't is the same since the last time slowRuleC was fired
>>
>>     --
>>     With kind regards,
>>     Geoffrey De Smet
>>
>>     _______________________________________________
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>>
>>
>>
>> -- 
>>   Edson Tirelli
>>   Software Engineer - JBoss Rules Core Developer
>>   Office: +55 11 3529-6000
>>   Mobile: +55 11 9287-5646
>>   JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
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