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

[Edson Tirelli]

     I guess we need a dedicated documentation team... problem is to
convince someone to sponsor it... :(

     Edson

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

> I am surprised, all the more so because (cf. Expert):
>
>  "Each rule has a salience attribute that can be assigned an integer *
> number*,"
>
> This does not event remotely indicate that you can use an *expression*involving bound variables.
>
> If it isn't documented, nobody will use it. Being in front of the when part
> where the bindings occur, it is counter-intuitive to other bound variable
> references, and so I didn't even try.
>
> However: good to know, and thanks!
>
> -W
>
>
>
> On 26 August 2010 15:21, Edson Tirelli <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>
> >>
> >> 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
> >> _______________________________________________
> >> rules-dev mailing list
> >> rules-dev at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-dev
> >
> >
> >
> > --
> >   Edson Tirelli
> >   JBoss Drools Core Development
> >   JBoss by Red Hat @ www.jboss.com
> >
> > _______________________________________________
> > rules-dev mailing list
> > rules-dev at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-dev
> >
> >
>
>
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>


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