[rules-users] many response

[Anstis, Michael (M.)]

You need to remember that a rule runs every time the patterns are matched. 
 
For example:-
 
rule "example"
when
    $a : ObjectA()
    $b : ObjectB()
then
    System.out.println("Rule 'example' ran");
end
 
Working Memory:-
 
1 - ObjectA
2 - ObjectA
3 - ObjectB
4 - ObjectB
 
The rule will run four times; once for each combination of ObjectA and ObjectB (1, 3) (1, 4) (2, 3) and (2, 4).
 
Object models are flattened in Working Memory so if you need to impose a relationship you need to add this to the rule. For example:-
 
[one-to-one mapping] ObjectA has one child ObjectB.
Method suggestion (returns an instance of ObjectB): ObjectA.getObjectB();
 
rule "example"
when
    $b : ObjectB()
    $a : ObjectA(objectB == $b)
then
    System.out.println("Rule 'example' ran");
end
 
[one-to-many mapping] ObjectA has many child ObjectB.
Method suggestion (returns a List): ObjectA.getObjectBs(); 
 
rule "example"
when
    $b : ObjectB()
    $a : ObjectA(objectBs contains $b)
then
    System.out.println("Rule 'example' ran");
end
 
Check that this is not the cause of your multiple unexpected executions.
 
With kind regards,
 
Mike
 


________________________________

	From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of fakhfakh ismail
	Sent: 13 April 2007 18:22
	To: jboss rules
	Subject: [rules-users] many response
	
	
	Hello,
	First sorry for my bad english
	when I execute a regle I get many response I don't know why?
	Example:
	
	rule "userrole"
	
	
	when
	
	user1: BnUserValue(nameuser : name)
	and
	Role : BnRoleValue()
	and
	ActiviteOut : BnNodeValue(bnRole == Role,executor == nameuser )
	and
	ActiviteIn : BnNodeValue(bnRole == Role )
	and 
	lien: BnEdgeValue(outBnNode == ActiviteOut,inBnNode ==ActiviteIn )
	
	then
	
	System.out.println("cette personne "+user1.getName()+ " ne peut pas executer cette activiter");
	
	end
	 
	the execution result
	
	cette personne ismail ne peut pas executer cette activiter
	cette personne ismail ne peut pas executer cette activiter
	cette personne ismail ne peut pas executer cette activiter
	cette personne ismail ne peut pas executer cette activiter
	cette personne ismail ne peut pas executer cette activiter
	cette personne ismail ne peut pas executer cette activiter
	 
	 
	 
	so the result is repeat 6 I don't know why?
	thank for your help
	Ismail
	 
	 
	 
	 
	 

	
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