On 29/08/2010 16:42, Wolfgang Laun wrote:
I *would* have added something on dynamic salience when I went over
the Expert manual, in 2008 (?) - if I'd only known it. Blogging is
fine - but it just isn't Documentation, with a capital 'D'.
This is also a nice case in point why I'm reluctant to invest work in
maintaining Drools documentation: From where the heck would I get to
know what's missing or obsolete or wrong? In some areas, I have
gathered sufficient experience, but there are vast areas where I'm
anything between spottily witted to downright ignorant. Also, there's
some furious hacking going on all the time (I presume), and how would
one rein that it to get to know what's happening?
Things do go into release notes, even if minimal:
https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/docs/drools-introduction/html_single/index.html
2.3.2. Core Engine Enhancements
* Dynamic salience for rules conflict resolution
What's needed is for someone to update docs more based on release notes.
Mark
Anyway, right now I'm collecting a loose set of How-tos, as a
by-product of current work, and for areas where I deem it useful. See
http://members.inode.at/w.laun/ and scroll down to "Rule Based
Programming" / "Drools" / "Selected Topics".
-W
On 27 August 2010 02:21, Mark Proctor <[email protected]
<mailto:[email protected]>> wrote:
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 <[email protected]
<mailto:[email protected]>> 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 <[email protected]
<mailto:[email protected]>>
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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JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>
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blog: michaelneale.blogspot.com <http://michaelneale.blogspot.com>
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