2:45 p.m.
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(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Tihomir Surdilovic
Sent: 03 June 2010 13:40
To: rules-users(a)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@lists.jboss.org<mailto: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<mailto: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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