[rules-users] Drools all lhs execute before all the rhs, i want to run sequentially

[Swindells, Thomas]

Have you read the expert guide? http://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html_single/index.html - At least up to the end of chapter 4.
Why are you using static fields and methods?
You are changing the value of objects in the when condition which is really really really bad and it's no wonder nothing is working like you are expecting.
The fact that you are using eval's is a good indication that your code is written wrong, for simple rules you never need to use it.

Thomas


> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of Saurabh Pandey
> Sent: 26 September 2011 11:22
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to
> run sequentially
>
> these are my rules:
> rule "Rule 03"
>   salience 10
>     when
>         $info : RuleRunner()
>         eval(RuleRunner.check())
>         eval(RuleRunner.setIt())
>     then
>         System.out.println("********3**********");
>         $info.printResult(1);
> end
>
> rule "Rule 04"
>   salience 8
>     when
>         $info : RuleRunner()
>         eval(RuleRunner.check())
>     then
>         System.out.println("********4**********");
>         $info.printResult(2);
> end
>
> these are my java methods:
> static boolean cvar = true;
> public void printResult(int i){
>     System.out.println(i);
>   }
>   public static boolean check(){
>     System.out.println("********check**********");
>     return cvar;
>   }
>   public static boolean setIt(){
>     cvar = false;
>     return true;
>   }
>
> this is how i am invoking the rules:
> KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>       kbuilder.add(ResourceFactory.newFileResource("rule03.drl"),
>                                ResourceType.DRL );
>
>       if ( kbuilder.hasErrors() ) {
>           System.err.println( kbuilder.getErrors().toString() );
>       }
>       KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
>       kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
>       StatelessKnowledgeSession ksession =
> kbase.newStatelessKnowledgeSession();
>       ksession.execute(new RuleRunner());
>
>
> This is the output:
> ********check**********
> ********3**********
> 1
> ********4**********
> 2
>
> Why is check printing only once though its called 2 times in 2 rules, and when
> cvar is false then also 2nd rule's then part is executing?
> Is it that static methods of same name are called once and there result is
> stored and used in all rules??
>
>
> --
> View this message in context: http://drools.46999.n3.nabble.com/Drools-all-
> lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-
> tp3368215p3368864.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users


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