Re: [rules-users] Same rules applies twice
Inserting two equal objects results in two facts, and each will trigger a
matching rule.
If your class Result contains a proper implementation of equals() and
hashCode(), you
may use
KnowledgeBaseConfiguration conf = ....
conf.setOption( AssertBehaviorOption.IDENTITY );
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase( conf );
and then inserting another equal object will be ignored by the engine.
You should not use
not( exists(...) )
not() alone is the negated existence quantifier. Although not wrong,
it's generally considered to be inelegant and confusing.
-W
2010/11/8 J-C Walmetz <jc7442(a)yahoo.fr>
Hi
I use Drools 5.01
I have the following rules:
rule "Reload test" salience 10000
when
$result: Result( $resultId:resultId)
not (exists Test(resultId.technicalId==$resultId.technicalId))
then
Test test = createTest($resultId);
insert(test);
end
When I insert two results with the same identifier, rules is applyed 2
times. One for each result. I do not understand why.
Do you have an idea of what's happen and how to guratantee that myl rules
will not be applied twice. Here order is not important ...
Thanks
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