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

[Swindells, Thomas]

A better approach is probably to split up the conditions from action.

Each condition would be a separate rule which would use insertLogically to insert a new object.

Then have another rule which accumulates and counts how many of these objects exist in the working memory.  If the count is >= 2 then perform the action.



Thomas


From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Tihomir Surdilovic
Sent: 03 June 2010 13:40
To: rules-users at lists.jboss.org
Subject: Re: [rules-users] Firing a rule if at least its two conditions are satified

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> [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<mailto: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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