[rules-dev] A dazzling feature - not in Drools!

[Edson Tirelli]

    Wolfgang,

    Not sure I understand what you mean, but Drools supports dynamic
salience:

rule "fire in rank order 1,2,..."
      salience( -$rank )
when
      Element( $rank : rank,... )
      ...
then
     ...
end

    Edson


2010/8/26 Wolfgang Laun <wolfgang.laun at gmail.com>

> Just FYI, but who knows ;-)
>
> Our proprietary vintage RBS has a feature is (admittedly) rarely used
> but could come in handy, every now and then.
>
> Given this class
>
>   class Element {
>       int rank; // rank > 0
>   }
>
> and to fire a rule in ascending rank order, you can write (using
> modified Drools syntax)
>
> rule "fire in rank order 1,2,..."
> when
>       Element( $rank : rank,... )
>       // ...
> salience -$rank    ### <=
> then
>      // ...
> end
>
> The dynamically set salience does all the work. (Of course, you can
> achieve the same order
> in Drools easily enough.)
>
> This is possible since salience is a value that must be carried over
> into the activation.
> There is at least one other rule attribute that shares this property,
> but I'm not sure
> whether anything useful can be done with dynamic agenda groups.
>
> Cheers
> -W
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>



-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com
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