[rules-users] Firing a rule if at least its two conditions are satified

[Tihomir Surdilovic]

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 at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] De la part de skasab2s
> Envoyé : jeudi 3 juin 2010 14:04
> À : rules-users at 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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