An approach that may work is to decouple the suggested results from the model
with support for multiple values.
To do this you could define an fact type of Affirmation(String name, Object
subject, Object value).
Where the names are a list of well known values.
You rules would then look like the following:
rule Is Major
when
$a : Applicant (age = 18)
then
insert(new Affirmation(IsMajor, $a, true));
end
rule Is Minor
when
$a : Applicant (age 21)
then
insert(new Affirmation(IsMajor, $a, false));
end
you can then look for contradictions with a rule like the following
rule contradiction
when
$aff1 : Affirmation()
$aff2 : Affirmation(this != aff1, name == $aff1.name, subject
== $aff1.subject, value != $aff1.value)
then
//is both true and false, 3 and 5 etc
end
Obviously there are various way this could be enhanced or done - the
affirmations could include the rule name to allow you to pinpoint which ones
are producing contradictory results etc. You would also have some lower
salience rules to actually populate your real facts with the actual results if
a contradiction didn't occur.
Thomas
-Original Message-
From: rules-users-boun...@lists.jboss.org [mailto:rules-users-
boun...@lists.jboss.org] On Behalf Of AlisterC
Sent: 11 March 2011 09:27
To: rules-users@lists.jboss.org
Subject: [rules-users] Conflict detection problem
Greetings,
I am working on a collaborative platform project which will contain
datas,
informations and knowledges
such as buisness rules. Consequently, a rule engine is a requisite and
I am
testing the Drools suite.
Because a lot of different people will be able to define rules, some
combinations might be contradictory.
So the rule user need to know which rules are in conflict, and
eventually
choose the ones to disabled to fix the problem.
Here is my use case : I fill in a java class some information about a
people, his hame and his age, and I want to check if he is an adult.
Two different users have written a rule to check this. The first,
living in
place where a 18 years old people is an adult wrote this rule :
___
rule Is Major
when
$a : Applicant (age = 18)
then
$a.setMajor( true );
end
___
The second one, write this one :
___
rule Is Minor
when
$a : Applicant (age 21)
then
$a.setMajor( false );
end
___
I've tried to solve this knowledge base with a 19 years old people, but
no
conflict was detected.
In fact the rules are executed sequentially and the result depends of
the
order the rules are called.
My use case is very simple, but I think I am not considering it
correctly.
Or maybe it is impossible with forward chaining ?
Does anyone can help me to solve this problem, by telling what is wrong
or
giving me some internet ressource link ?
Thanks a lot in advance.
--
View this message in context: http://drools-java-rules-
engine.46999.n3.nabble.com/Conflict-detection-problem-
tp2664121p2664121.html
Sent from the Drools - User mailing list archive at Nabble.com.
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