4:18 p.m.
Basically, you can either update an object with the results of the first
rule, or create a new object.
Like:
rule "Hungry"
when
$person : Person(hoursSinceLunch>2 || donutsOnDesk==0 ||
candybarsInDrawer==0)
then
$person.setHungry(true);
update($person);
end
rule "Food"
when
$person : Person(hungry==true)
then
$person.lookForFood()
end
or
rule "Hungry"
when
$person : Person(hoursSinceLunch>2 || donutsOnDesk==0 ||
candybarsInDrawer==0)
then
$hungry=new Hungry();
$hungry.setPerson($person);
insert($hungry);
end
rule "Food"
when
$person : Person()
$hungry : Hungry(person==$person)
then
$person.lookForFood()
end
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4:26 a.m.
New subject: How to reuse a result of a rule in an other rule
The latter approach is particularly powerful we have a very simple but amazingly flexible
class called Affirmation which just have 3 fields - String name, Object subject, Object
value. This however gives most flexibility that you need
Eg
rule "Hungry"
when
$person : Person(hoursSinceLunch>2 || donutsOnDesk==0 ||
candybarsInDrawer==0)
not Affirmation(name == "PersonIsHungry", subject == $person)
then
insert(new Affirmation("PersonIsHungry", $person, true);
end
rule "Food"
when
$person : Person()
Affirmation(name == "PersonIsHungry", subject == $person, value == true)
not Affirmation(name == "PersonHasLookedForFood", subject == $person)
then
modify($person) {
lookForFood()
}
insert(new Affirmation("PersonHasLookedForFood", $person));
end
- I;ve also updated the rules so they are less likely to retrigger multiple times if some
other rules modify person
Thomas
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of mjohansen
Sent: 21 July 2011 22:18
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] How to reuse a result of a rule in an other rule
Basically, you can either update an object with the results of the first rule, or
create a new object.
Like:
rule "Hungry"
when
$person : Person(hoursSinceLunch>2 || donutsOnDesk==0 ||
candybarsInDrawer==0)
then
$person.setHungry(true);
update($person);
end
rule "Food"
when
$person : Person(hungry==true)
then
$person.lookForFood()
end
or
rule "Hungry"
when
$person : Person(hoursSinceLunch>2 || donutsOnDesk==0 ||
candybarsInDrawer==0)
then
$hungry=new Hungry();
$hungry.setPerson($person);
insert($hungry);
end
rule "Food"
when
$person : Person()
$hungry : Hungry(person==$person)
then
$person.lookForFood()
end
--
View this message in context: http://drools.46999.n3.nabble.com/How-to-
reuse-a-result-of-a-rule-in-an-other-rule-tp3182344p3189730.html
Sent from the Drools: User forum mailing list archive at Nabble.com.
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1 comments
2 participants
participants (2)
-
mjohansen -
Swindells, Thomas