Hi,
You must make a difference between "facts" and other objects (that you can get
by "bindings").
"facts" are the objects inserted in the working memory. Only those objects can
be matched directly in LHS. Other entities can be accessed by using attributes
(of facts) bindings or "from" constructions to get objects from "facts" fields.
And finally, only the "facts" can be modified/inserted/retracted, ie actions
that trigger a RETE evaluation and thus new candidate rules to fire.
Here, in your first rule, your LHS is matching facts and use a binding
$krankheitsbild for a field of KrankheitsbildVonPatient fact.
And you are modifying the binded attribute, which is not a fact. So it won't
trigger RETE evaluation... To me, it should not compile, but apparently it does
....
You can think about 2 corrections :
1 - make your $krankheitsbild objects real facts, ie insert them in the WM, and
don't get them via attribute binding
2 - do the set on $krankheitsbild, then "update" your containing fact object (
with update($krankheitsbildVonPatient) )
here are the approximative form of the resulting rules for the 2 approaches :
---------------1-------------------
I suppose that Krankheitsbild objects are inserted independently, and your
model modified like that
declare KrankheitsbildVonPatient
patient : Patient
end
declare Krankheitsbild
parent : KrankheitsbildVonPatient
abdominaleAdipositas : boolean
adipositasGrad : String
risikoBegleiterkrankungGrad : int
risikoMetabolischeKardiovaskulaereKomplikationen : String
metabolischesSyndrom : boolean
end
so the rule should look like :
rule "...."
when
MessdatenVonPatient($patient : patient && (getMessdaten().getBmi() >= 18.5) &&
(getMessdaten().getBmi() < 25))
$krankheitsbildVonPatient : KrankheitsbildVonPatient(patient == $patient )
$krankheitsbild : Krankheitsbild ( parent == $krankheitsbildVonPatient )
then
modify($krankheitsbild){setAdipositasGrad("Normalgewicht"),
setRisikoBegleiterkrankungGrad(1)
}
end
---------------2-------------------
May be simpler, but beware of loops ...
rule "..."
when
MessdatenVonPatient($patient : patient && (getMessdaten().getBmi() >= 18.5) &&
(getMessdaten().getBmi() < 25))
$krankheitsbildVonPatient : KrankheitsbildVonPatient(patient == $patient &&
$krankheitsbild : krankheitsbild)
then
$krankheitsbild.setAdipositasGrad("Normalgewicht");
$krankheitsbild.setRisikoBegleiterkrankungGrad(1);
update ( $krankheitsbildVonPatient ) ;
end
----- Mail original -----
De: "wichtl" <irr4e...@gmx.net>
À: rules-users@lists.jboss.org
Envoyé: Jeudi 30 Août 2012 15:56:29
Objet: [rules-users] rules not being reconsidered after modify
Hi,
I'm new to using Drools and its probably just a problem with me
understanding how this works, but I've tried everything i can think of, so I
come to you in hope for some help!
I have a set of rules which modify an object in the RHS and another set of
Rules that should be fireing after the modification of the object.
Rule modifying the Object:
rule "Wenn der BMI des Patienten >= 18.5 und < 25 ist, dann gehört der
Patient der Kategorie 'Normalgewicht' an und hat ein 'durchschnittliches'
Risiko für Begleiterkrankungen des Übergewichts"
when
MessdatenVonPatient($patient : patient && (getMessdaten().getBmi() >=
18.5) && (getMessdaten().getBmi() < 25))
$krankheitsbildVonPatient : KrankheitsbildVonPatient(patient == $patient
&& $krankheitsbild : krankheitsbild)
then
modify($krankheitsbild){setAdipositasGrad("Normalgewicht"),
setRisikoBegleiterkrankungGrad(1)
}
end
Rule that should fire after the modification:
rule "Wenn Patient der Kategorie 'Normalgewicht' angehoert, dann werden
folgende Maßnahmen vorgeschlagen"
when
KrankheitsbildVonPatient($patient : patient, krankheitsbild.adipositasGrad
== "Normalgewicht")
then
System.out.println("Some Text");
end
Also I have encountered problems (application freezes) when trying to modify
the "$krankheitsbildVonPatient" object in the RHS. And I still don't
understand why it did freeze and why modifying "$krankheitsbild" does not.
Heres my datamodel if needed:
http://drools.46999.n3.nabble.com/file/n4019463/dataModel.drl dataModel.drl
Best Regards,
wichtl
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