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] <[hidden email]> 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.
-W2012/1/10 Shweta1986 <[hidden email]>
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]> 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.
-W2012/1/10 Shweta1986 <[hidden email]>
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]> wrote:
2012/1/6 Shweta1986 <[hidden email]>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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