[rules-users] Large number of rules in Drools
Shweta1986
shweta.a.thakkar at gmail.com
Tue Jan 10 14:54:16 EST 2012
My rules are as follows.
rule "rule1"
salience -2
dialect "mvel"
when
stud : Student ( field == "ARTS", state.equals("WA"))
then
java.util.List subList = new java.util.ArrayList();
Subject subject = new Subject();
subject.setName("ABC");
subject.setFees(33454);
subject.duration(4);
subList.add(subject);
subject = new Subject();
subject.setName("XYZ");
subject.setFees(33454);
subject.duration(4);
subList.add(subject);
stud.setSubjects(subList);
end
rule "rule2"
salience -100
dialect "mvel"
when
stud : Student ( field == "ARTS", state.equals("WA") , city ==
"SEATTLE"))
then
java.util.List subList = new java.util.ArrayList();
Subject subject = new Subject();
subject.setName("ABC");
subject.setFees(33454);
subject.duration(4);
subList.add(subject);
subject = new Subject();
subject.setName("XYZ");
subject.setFees(33454);
subject.duration(4);
subList.add(subject);
stud.setSubjects(subList);
end
Student is the main object and it contains List of Subjects. here the way I
am using the salience because
if the input us shweta, ARTS, WA,Olympia it matched rule1
but if the input is shweta, ARTS, WA, Seattle it matches 1 and 2 but i want
the rule 2 to be executed so salience.
I am using StatelessKnowledge Session and also the resource change scanner.
I execute one rule at a time and the scanner poll interval is 1 hour.
When I started with 100 rules I was using "PK" as my source in
changeSet.xml but when the rules grew to 20K I was not able to build the
rules in Guvnor UI and hence I started using "DRL" as source.
The way I generate drl is using a script which converts the csv to drl
format.
I copy the drl to the text area in techincal rules and save it. ( this copy
is also paiful so I asked that if there is an upload drl file unlike the
import drl file)
In changeset I give the path to the url in webdav
/guvnor/org.drools.guvnor.Guvnor/webdav/packages/StudentRules/StudentRules.drl
I am not sure if I am doing it the right way. Please suggest.
Thanks,
Shweta
On Mon, Jan 9, 2012 at 11:58 PM, laune [via Drools] <
ml-node+s46999n3647015h3 at n3.nabble.com> wrote:
> Salience is just one way to force the evaluation of a condition before
> others. In fact, using salience throughout is just a way of re-creating a
> sequence of plain old if statements using a rules engine.
>
> I'm not going to waste my time and yours by elaborating on possible
> alternatives unless you come up with a detailed description of your rules,
> and how you run your rules engine: fact insertion, calls to fire, etc.
>
> -W
>
> 2012/1/10 Shweta1986 <[hidden email]<http://user/SendEmail.jtp?type=node&node=3647015&i=0>
> >
>
>> I am not sure I understand that. What is the other option for this case.
>> Why would simple rules not work for 20 K rules. Am I missing something. I
>> cannot use database to store my rules. Drools also gives me salience which
>> I need for my usecase.
>>
>> On Thu, Jan 5, 2012 at 11:29 PM, laune [via Drools] <[hidden email]<http://user/SendEmail.jtp?type=node&node=3646449&i=0>
>> > wrote:
>>
>>> 2012/1/6 Shweta1986 <[hidden email]<http://user/SendEmail.jtp?type=node&node=3637255&i=0>
>>> >
>>>
>>>> And my rules are very simple it is like if string comparison then set
>>>> that's it..
>>>>
>>> This doesn't really warrant the use of a rule based system. If keeping
>>> this logic out of the application or an easy maintenance of these if-then's
>>> are your main goals, there are other ways. I've already hinted at this,
>>> with the idea of providing the information embedded in similar rules as
>>> data.
>>> -W
>>>
>>>
>>>
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