Notice that updates via (call ....) to the Java object require that the
bean does property change notification, as described in section 5.3.3,
to update the shadow fact.
; class Host with attributes firstName, lastName
(deftemplate Host (declare (from-class at.laune.project.Host)))
(reset)
(bind ?h1 (new at.laune.project.Host "John" "Smith"))
(add ?h1)
(bind ?h2 (new at.laune.project.Host "Paul" "Jones"))
(add ?h2)
(defrule find1
(declare (no-loop TRUE))
?hostFact <- (Host (OBJECT ?hostObj) (lastName "Smith"))
=>
(printout t "fact 1 - firstName = " (fact-slot-value ?hostFact
firstName) crlf)
(call ?hostObj setFirstName "George")
(printout t "fact 1 - firstName = " (fact-slot-value ?hostFact
firstName) crlf)
)
(defrule find2
(declare (no-loop TRUE))
?hostFact <- (Host (lastName "Jones"))
=>
(printout t "fact 2 - firstName = " (fact-slot-value ?hostFact
firstName) crlf)
(modify ?hostFact (firstName "Richard"))
(printout t "fact 2 - firstName = " (fact-slot-value ?hostFact
firstName) crlf)
)
(printout t "Java object 1 - firstName = " (call ?h1 getFirstName) crlf)
(printout t "Java object 2 - firstName = " (call ?h2 getFirstName) crlf)
(run)
(printout t "Java object 1 - firstName = " (call ?h1 getFirstName) crlf)
(printout t "Java object 2 - firstName = " (call ?h2 getFirstName) crlf)
vanhaabe wrote:
Still no progress. Can't bind OBJECT, error I'm getting is "Undefined
function OBJECT".
Can you please elaborate to call "OBJECT" in cpl file.
Thanks,
E
Wolfgang Laun wrote:
The object behind the shadow fact is available in the slot OBJECT.
Simply bind that slot to a Jess variable:
(MC ... (OBJECT ?mcObj))
---
(call ?mcObj setPassed TRUE)
If MC is sufficiently beanish you have a slot Passed and can use modify
with some variable bound to the fact which will update the Java object;
but if you call the method: does it trigger the update of the shadow fact?
The Jess manual's section 5.3 contains more useful hints on shadow facts.
-WL
vanhaabe wrote:
Hi,
This is probably easy onem, but I can't figure it out. I need to do
object
validation, and have flag "passed" set from within my rule.
_________________________________________________________
This is my cpl file
(import com.mycompany.yadda.yadda.MC)
(deftemplate MC(declare (from-class MC)))
(defrule mcrule
"Rule 11"
(MC {fg == "P"})
=>
(printout t "Rule 11" crlf)
(call ?MC setPassed TRUE)
)
_______________________________________________________________
and this is how I call it from Java:
engine.resetToMark(marker);
MC mc = new MC();
mc.setfg("P");
MC mc1 = new MC();
mc1.setfg("D");
engine.add(mc);
engine.add(mc1);
engine.run();
return engine.getObjects(new Filter.ByClass(MgmtChars.class));
_____________________________________________________________________
Rules are validated correctly, but when it executes method setPassed it
throws exceptions: "No such variable MC", and that is correct. I simply
don't know how to reference/access object that rule is currently executed
on. If you can shed some light on it that would be really appreciated.
Thanks,
Ed
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