[rules-users] reuse a rule already fired

[Edson Tirelli]

   Ck,

    You need to think different when using forward chaining. Your data will
drive the execution, not your "goals".
    So, the state of your facts match rule B twice, it will fire twice.

    "Stupid" example:

rule "1. increment counter"
   salience 10
when
    $c : Counter( value < 2 )
then
    System.out.println( "firing rule 1" );
    $c.setValue( $c.getValue() + 1 );
    modify( $c );
end

rule "2. diplay counter"
when
    Counter( $value : value )
then
    System.out.println("Value = "+$value);
end

   If you do:

wm.assertObject( new Counter( 0 ) );
wm.fireAllRules();

    Rules will fire:

1 -> 1 -> 2

    But that is because your "state" (facts) drive them in that way. Do you
understand that? Try removing salience attribute and check if there is any
difference. Try making rule 2 higher salience than rule 1. Try asserting
different values for the counter, like new Counter( 2 ).

    []s
    Edson


2007/5/9, ch4nd4n <chandan_kumar at msn.com>:
>
>
> Hi,
> is there a possibility to fire a particular rule twice?
>
> For example if I have Rules "A", "B", "C", "D" and I am putting a Person
> Object with few parameters,
>
> Then how can I fire in following order
>
> A -> B -> C -> B -> D
>
> Thanks,
> Ck
> http://www.gfour.net
> --
> View this message in context:
> http://www.nabble.com/reuse-a-rule-already-fired-tf3714857.html#a10391552
> Sent from the drools - user mailing list archive at Nabble.com.
>
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-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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