Also, remember to follow the bean spec when firing your property change
events.
See for more details.
http://www.mail-archive.com/[email protected]/msg01977.html
and
http://www.mail-archive.com/[email protected]/msg01745.html
alan
> -----Original Message-----
> From: Thomas Barnekow [mailto:[EMAIL PROTECTED]]
> Sent: Saturday, October 14, 2000 4:07 AM
> To: JESS
> Subject: RE: JESS: Another bean question
>
>
> Hi!
>
> (1) Did you define a dynamic or static Bean instance?
> (2) Does your Bean's setName(String) method fire a
> PropertyChange event?
>
> In order to have your shadow facts' slot values modified you
> need to (1) define dynamic instances using
>
> (definstance mybean (new MyBean ...)) or
> (definstance mybean (new MyBean ...) dynamic)
>
> and to (2) fire PropertyChange events in your setter methods.
> This is due to the way the Definstance and Modify
> Userfunctions (i.e., the classes implementing (definstance
> ...) and (modify ...)) are working. Definstance creates a
> shadow fact and registers itself as a PropertyChangeListener,
> if the Bean is dynamic. Modify doesn't change the shadow
> fact's slot values directly. Instead, it uses the Set
> Userfunction in order to modify the Bean's properties via its
> setter methods (using Reflection). The shadow fact's slot
> value, which is printed by the (facts) statement, is changed
> by the Definstance Userfunction only upon reception of a
> PropertyChangeEvent sent by the Bean's setter method.
>
> Thomas
>
> > I am using (modify) to alter the value of a slot in a definstance
> > fact which is mapped onto
> > an instance of a bean.
> >
> > (defrule startup => (modify 1 (name "Emmeline")))
> >
> > The I try to print the value of the bean property inside the Java
> > program and it displays
> > fine. The funny thing is that before and after I print out the
> > property, the use of (facts) shows
> > the following output. The slot in the definstance fact is not
> > changed! Why is this so?
> >
> > r.reset();
> > r.executeCommand("(batch JessBean.clp)");
> > r.run();
> > r.executeCommand("(facts)");
> > System.out.println(bean.getName());
> > r.executeCommand("(facts)");
> >
> > Output:
> >
> > f-0 (initial-fact)
> > f-1 (mybean (class <External-Address:java.lang.Class>) (name
> > "Mimi") (OBJECT <
> > External-Address:MyBean>))
> > For a total of 2 facts.
> > Emmeline
> > f-0 (initial-fact)
> > f-1 (mybean (class <External-Address:java.lang.Class>) (name
> > "Mimi") (OBJECT <
> > External-Address:MyBean>))
> > For a total of 2 facts.
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