IMO you can just use activation groups and not have to deal with incrementing, something like:

rule first
activation-group "myactgrp"
when
   Condition A
   Condition B
then
...
end


rule second
activation-group "myactgrp"
when
   Condition A
   Condition C
then
...
end

rule third
activation-group "myactgrp"
when
   Condition B
   Condition C
then
...
end

When one of these rules fire it will cancel the activation of all other rules in the same activation group. You can also then add salience to control rule priority.


On 6/3/10 8:15 AM, PAYET, Manuel wrote: 
If I were you, I'd use something like 

Global java.lang.Integer cnt;

Rule "before everything"
Salience 10
When
Eval(true)
Then
Cnt=0
End


Rule "condition A"
When 
 condition A
Then
  cnt=cnt+1;
End

Rule "condition B"
When 
 condition B
Then
  cnt=cnt+1;
End

Rule "condition C"
When 
 condition B
Then
  cnt=cnt+1;
End


Rule "action 1, after everything"
Salience -10
When 
	eval(cnt>=2)
Then
	execute action 1
End


Of course, if you change the fact, you'll probably have to think about things like lock-on-active to increment only one time the cnt variable


-----Message d'origine-----
De : rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] De la part de skasab2s
Envoyé : jeudi 3 juin 2010 14:04
À : rules-users@lists.jboss.org
Objet : [rules-users] Firing a rule if at least its two conditions are satified


Hello,

we are using Drools in our company. We have a rule with three conditions in this format:

when
     Condition A
     Condition B
     Condition C
then 
     execute Action 1

Now we have a situation, in which the rule should fire if AT LEAST two of the three conditions are satisfied. Do you know how to implement this? Any ideas or hints?

Many thanks and regards!

skasab2s.


 

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Sent from the Drools - User mailing list archive at Nabble.com.
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