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

[Mark Proctor]

  On 27/08/2010 00:05, Michael Neale wrote:
> Hahaha - yes - that is what I was thinking.
>
> Dyanmic salience was added some time back - but its one of those "did 
> it and forgot about it" things.
> Also - historically salience has been "abused" more than "used" - so 
> perhaps there is less excitement to talk about what you can do with it.
>
> But the case wolfgang mentioned is a good one - if you know you need 
> it you can probably safely use it.
http://blog.athico.com/2007/05/dynamic-salience-expressions.html
>
> On Thu, Aug 26, 2010 at 11:21 PM, Edson Tirelli <tirelli at post.com 
> <mailto:tirelli at post.com>> wrote:
>
>         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
>     <mailto: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 <http://www.jboss.com>
>
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>
>
>
> -- 
> Michael D Neale
> home: www.michaelneale.net <http://www.michaelneale.net>
> blog: michaelneale.blogspot.com <http://michaelneale.blogspot.com>
>
>
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