[rules-users] rule fires several times

[Wolfgang Laun]

A rule will fire once fore each combination of matching facts, and then,
again and again and again, whenever one of those facts is changed.

In your case: once for reason #1 and once for reason #2.

-W

On 30 October 2011 20:30, elsdestickere <elsdestickere at yahoo.com> wrote:

> Hi,
>
> The Expert documentation says " a rule may fire once or several times", but
> I don't understand why a rule sould fire several times if the objects state
> does not change?
>
> I have an example of a Customer object inserted in the Working Memory, with
> 2 rules that should fire, but the last rule fires twice.
> Can someone explain?
>
> rule "isAdult"
>    when
>        k : Customer( age(date)>=18, adult==false );
>    then
>        modify( k ) { setAdult(true)  };
>        System.out.println( "Drools "+drools.getRule().getName()+": "+
> k.getAdult() );
> end
> rule "WM"
>    when
>       k : Customer(  ) ;
>    then
>        System.out.println( "Drools "+drools.getRule().getName()+": "
> +k.getName());
> end
>
> ...
> Customer bert = new Customer ();
> bert.setName("Bert");
> bert.setDate(30);
> ksession.insert(bert);
> ksession.fireAllRules();
> ...
> Output:
> Drools WM: Bert
> Drools isAdult: true
> Drools WM: Bert
>
> Br,
> Els Destickere
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/rule-fires-several-times-tp3466250p3466250.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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