Re: [rules-users] Infinte Loop problem
benjimcc wrote:
Im sure people have seen this before ive searched high and low for an
answer
but no luck, fairly new to using drools so any advice would be much
appreciated. Here is a sample of my rules:
rule "Gender Desirability"
salience 400
no-loop true
when
$broker : Broker(brokerName=="bah")
Proposer(gender == "F")
then
int desirability = $broker.getDesirability() + 10;
$broker.setDesirability(desirability);
update($broker);
System.out.println("Gender Hit");
end
rule "Age Desirability"
salience 200
no-loop true
when
$broker : Broker(brokerName=="bah")
$proposer : Proposer($dob : dateOfBirth)
$rulesrequest : RulesEngineRequest($inception : inceptionDate)
eval(age_desirability_flex.isInRange($proposer.getAge($dob,$inception))==true)
then
int desirability = $broker.getDesirability() + 20;
$broker.setDesirability(desirability);
update($broker);
System.out.println("Age Hit");
end
rule "Check Desirability"
salience 190
when
$broker : Broker($des : desirability,brokerName=="europa")
eval($des < desirability_Index)
then
$broker.setInclude(false);
retract($broker);
end
Ok basically all the 'when' bits work. But what seems to happen is that
when the update happens and the rules are evaled again and it ping pongs
between the two rules as they both update the Broker object. Resulting in
the 'Check Desirability' never being hit and for debug spewing 'Gender
Hit'
'Age Hit' in a infinite loop till te JVM runs out of memory and it crash and
burns.
checkout the attribute lock-on-active. You'll need to put the rules into
an angenda-group or ruleflow-group, but what this means is it'll fire
just the current activated rules and while that group has the focus no
more rules for those groups can activate - thus stopping the ping pong
effect. See the conways game of life example to see this in action.
Any help in this would be much appreciated. If you need any more
information let me know as well.
Thanks
Ben
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