Hi,
In Jess 7.0b3, the default for definstance type changed from dynamic
to auto. If you specified dynamic as the last argument to
definstance, then Jess would try to register itself with your Bean as
a PropertyChangeListener; this used to be the default, so that you had
to write static if you didn't want this behavior. The new default is
auto. In this case, Jess looks at the Bean to see if it accepts
PropertyChangeListeners and only registers itself if the Bean does,
indeed, accept them.
Jess's current definition of indeed accepts them is that the
following two methods exist with these exact signatures:
public void addPropertyChangeListener(PropertyChangeListener);
public void removePropertyChangeListener(PropertyChangeListener);
So if this worked for you in dynamic mode, my guess is that your
Beans don't have the removePropertyChangeListener method. The right
thing to do is add it, but a band-aid would be to say
(definstance block ?g dynamic)
This will work until you try undefinstance which, of course, won't
work (it never did.)
If I've guessed wrong, and it's something else, let me know, please!
I think Dusan Sormaz wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
I am running example that uses property change listeners to update shadow
fact when object changes.
Problem that I have is that running same code in Jess7.0b2 and Jess7.0b4
produces different results. Here is the log for both:
Jess, the Rule Engine for the Java Platform
Copyright (C) 2005 Sandia Corporation
Jess Version 7.0b4 11/1/2005
Jess (require defclasses)
defclasses
Jess (bind ?g (new Block G))
Java-Object:edu.ohiou.imse.ise891.blockworld.Block
Jess (definstance block ?g)
Fact-0
Jess (facts)
f-0 (MAIN::block (class Java-Object:java.lang.Class) (name G) (OBJECT
Java-Object:edu.ohiou.imse.ise891.blockworld.Block))
For a total of 1 facts in module MAIN.
Jess (?g setName gfd)
before PCS
after PCS
Jess (facts)
f-0 (MAIN::block (class Java-Object:java.lang.Class) (name G) (OBJECT
Java-Object:edu.ohiou.imse.ise891.blockworld.Block))
For a total of 1 facts in module MAIN.
Jess
Jess, the Rule Engine for the Java Platform
Copyright (C) 2005 Sandia Corporation
Jess Version 7.0b2 8/11/2005
Jess (require defclasses)
defclasses
Jess (bind ?g (new Block G))
External-Address:edu.ohiou.imse.ise891.blockworld.Block
Jess (definstance block ?g)
Fact-0
Jess (facts)
f-0 (MAIN::block (class External-Address:java.lang.Class) (name G)
(OBJECT External-Address:edu.ohiou.imse.ise891.blockworld.Block))
For a total of 1 facts in module MAIN.
Jess (?g setName gfd)
before PCS
after PCS
Jess (facts)
f-0 (MAIN::block (class External-Address:java.lang.Class) (name gfd)
(OBJECT External-Address:edu.ohiou.imse.ise891.blockworld.Block))
For a total of 1 facts in module MAIN.
Jess
While Jess7.0b2 works as expected, Jess7.0b4 doe snot update fact when
object changes.
Any ideas why is this happening?
Dusan Sormaz
*
* Du_an _ormaz, PhD, Associate Professor
* Ohio University
* Industrial and Manufacturing Systems Engineering Department
* 277 Stocker Center, Athens, OH 45701-2979
* phone: (740) 593-1545
* fax: (740) 593-0778
* e-mail: [EMAIL PROTECTED]
* url: http://www.ent.ohiou.edu/~sormazhttp://www.ent.ohiou.edu/~sormaz
*
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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