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.

On Thu, Aug 26, 2010 at 11:21 PM, Edson Tirelli <tirelli@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@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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