Re: [rules-users] Large number of rules in Drools

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 >>>> >>>> >>>> >>>> _______________________________________________ >>>> rules-users mailing list >>>> [hidden email] <http://user/SendEmail.jtp?type=node&node=3637255&i=1> >>>> https://lists.jboss.org/mailman/listinfo/rules-users >>>> >>>> >>>> ------------------------------ >>>> If you reply to this email, your message will be added to the >>>> discussion below: >>>> >>>> http://drools.46999.n3.nabble.com/Large-number-of-rules-in-Drools-tp36303... >>>> To start a new topic under Drools: User forum, email [hidden email]<http://user/SendEmail.jtp?type=node&node=3646449&i=1> >>>> To unsubscribe from Drools: User forum, click here. >>>> NAML<http://drools.46999.n3.nabble.com/template/NamlServlet.jtp?macro=... >>>> >>> >>> >>> ------------------------------ >>> View this message in context: Re: [rules-users] Large number of rules >>> in Drools<http://drools.46999.n3.nabble.com/Large-number-of-rules-in-Droo... >>> >>> Sent from the Drools: User forum mailing list archive<http://drools.46999.n3.nabble.com/Drools-User-forum-f47000.htm... 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