[rules-users] Large number of rules in Drools
Shweta1986
shweta.a.thakkar at gmail.com
Tue Jan 10 18:07:47 EST 2012
I can look into the solution of writing my own Java application for this
solution. But I would still like to understand, if the problem is just
because of the 3 values being checked in the rules ? Do complex rules dont
have more than 1 checks ?
If yes then this case should be supported no matter how simple the rule is
right ?
Also for the UI issue I mentioned. Assume some other complex rules. Is
copying the thousands of lines in the text area not a problem in guvnor ?
On Tue, Jan 10, 2012 at 12:38 PM, laune [via Drools] <
ml-node+s46999n3648792h90 at n3.nabble.com> wrote:
> Assuming that the remaining 19998 rules are of the same kind, there is a
> lot of data in these rules, and only very little logic. Ignoring the issue
> of "Olympia" being one of the cities not being "Seattle", we have the
> problem of matching a triplet of <field,state,city> from a Student fact so
> that we can store one or more Subjects in Student.subjects.
>
> Imagine that you have objects of type Inscribe containing a triplet of
> field, state, city and the pertaining List<Subject>. Then you could write a
> single (!) rule
>
> rule register
> when
> $stu: Student ( $f: field, $s: state, $c: city )
> $ins: Inscribe( field==$f, state==$s, city==$c )
> then
> $stu.setSubjects( $ins.getSubjects() );
> end
>
> BTW: Why do you use equals with state? Using "==" should be possible here,
> too.
>
> And, of course, matching ~20000 different triplets to facts of a single
> type isn't really RBS fodder. You can design a simple Java program that
> achieves this goal, assuming you can come up with a straightforward
> representation of the <field,state,city;subject+> mapping.
>
> -W
>
>
> 2012/1/10 Shweta1986 <[hidden email]<http://user/SendEmail.jtp?type=node&node=3648792&i=0>
> >
>
>> 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] <[hidden email]<http://user/SendEmail.jtp?type=node&node=3648661&i=0>
>> > 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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