Re: [rules-users] rule chaining problem?
Well yes, but the whole idea of a rule system is precisely to let the
rules do the work for you.
That is in fact the main reason why I chose to use a rule system. As
the system gets more complex
expressing the logic in rules (and letting the rules fire themselves
until the system is stable again, so to speak)
will keep maintainability, (I hope :P ).
Francisco Brum wrote:
What you cold do it's before deleting a node, first you will
remove it arcs!
Maybe using a flag identifying future node to delete, and all the arcs from a node with
that flag is deleted. And then delete the node. To do that, use the term salient.
I'm just a beginner in rules, but this seams right.
__________________________________
Francisco Brum - francisco.brum(a)link.pt
Link Consulting - http://www.link.pt/
Tel.: 213 100 031
Av. Duque D'Ávila, 23 4º Esq.
1000-138 Lisboa
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Gerardo
Sent: quarta-feira, 7 de Fevereiro de 2007 18:03
To: rules-users(a)lists.jboss.org
Subject: [rules-users] rule chaining problem?
Hi everyone,
I have this scenario:
A diagram with nodes and arcs between them.
I'm willing to control the visual elements with rules.
Nodes are asserted at the moment of insertion.
Object node = new AnyObject() ;
FactHandle hNode = workingMemory.assertObject( node ) ;
Nodes are retracted from working memory when are deleted from the diagram.
workingMemory.retractObject( hNode ) ;
Arcs can not exist in the diagram if any of the related nodes no longer
exists.
So I must have a rule that keeps consistency in the diagram, something like:
## to illustrate the problem just checking source
rule "Delete no longer valid arcs"
when
a : Arc(s: source, tag, t: target)
not s: Object()
then
retract(a) ;
end
But the rule is not working, help is much appreciated
Regards,
Gerardo Segura
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