Jess reacting to a PropertyChangeEvent isn't any different from
calling (modify) on a regular fact; the value of one or more slots
changes. You don't think in any special way about writing rules to
fire when properties change, or anything like that; you just write
rules to match slot or values of slot, and when the slots change, the
rules are reevaluated.
On Sep 8, 2008, at 8:35 AM, John Chrysakis wrote:
To follow my question could you provide me a simple example of
changing
one property which in terms fires different rules?
I'm a little bit confused of how I should use the property change
listeners and how should I test them?
Many thanks in advance!
-----------------------------------------------------
John Chrysakis
R&D Engineer,
Institute of Computer Science (ICS),
Foundation for Research and Technology-Hellas (FORTH)
Heraklion, Crete, Greece.
-----------------------------------------------------
On Mon, 8 Sep 2008, John Chrysakis wrote:
Hello again to all Jess Users,
I am trying to use propertychange listeners in a simple jess
application.
But I am getting: "Jess reported an error in routine
DefinstanceList.updateMultipleSlots"
The application examines the Type of an event and prints different
message
So the EventRules.clp has the following rules:
(import pack.*)
(deftemplate CurrentEvent(declare (from-class CurrentEvent )))
(defrule check-event-type
(CurrentEvent {reading == "TypeX" } ) => (printout t "Event TypeX"
crlf))
(defrule check-event-type
(CurrentEvent {reading == "TypeY" } ) => (printout t "Event TypeY"
crlf))
(defrule check-event-type
(CurrentEvent {reading == "TypeZ" } ) => (printout t "Event TypeX"
crlf))
I hava a BeanSupport Class like the one of page 230 /Jess In Action
Book.
I hava a BeanSimulator which fills some values the class
CurrentEvent (My
Bean Class) and the TestJessBean which includes the main and the
required
function calls to Java API.
Any ideas please, what I'm doing wrong?
Thanks in advance,
//////////////////////////////////////////////////////////////////////////////////////////////////
package pack;
public class BeanSimulator implements Runnable {
private String theEventType;
public BeanSimulator(){
new Thread (this).start();
}
public String getEventType(){
return theEventType;
}
public void run(){
theEventType = "TypeY";
while (true){
try {
for (int i=0; i<3; i++){
theEventType = "TypeX";
Thread.sleep(1000);
theEventType = "TypeY";
Thread.sleep(1000);
theEventType = "TypeZ";
Thread.sleep(1000);
}
} catch (InterruptedException e) {
e.printStackTrace();
return;
}
}
}
}
/////////////////////////////////////////////////////////////////////////////////////////
package pack;
public class CurrentEvent extends BeanSupport implements Runnable{
private String event_type;
private String event_type_old;
private String event_sender;
private BeanSimulator bs;
public CurrentEvent(String type, String sender){
event_type = type;
event_sender = sender;
}
public CurrentEvent(){
}
public String getReading(){
return bs.getEventType();
//return "TypeY";
}
public void run() {
while (true) {
String cur_eventtype = getReading();
m_pcs
.firePropertyChange("cur_eventtype",event_type_old,cur_eventtype);
event_type_old = cur_eventtype;
try { Thread.sleep(1000); }
catch (InterruptedException ie) { return; }
}
}
}
//////////////////////////////////////////////////////////////////////////////////////////////////
package pack;
import java.io.IOException;
import jess.*;
public class TestJessBean {
public static void main (String[] args) throws
InterruptedException, IOException {
JessHandler jesshand; // Makes run-until-halt and
handls
rete Objects (Engine)
CurrentEvent cev = new CurrentEvent();
try {
jesshand = new JessHandler();
jesshand.batch("EventRules.clp");
BeanSimulator bs = new BeanSimulator();
//jesshand.add(cev);
jesshand.defClass("CurrentEvent","CurrentEvent",null);
jesshand.defInstance("CurrentEvent",cev,
true);
} catch (JessException e) {
e.printStackTrace();
}
}
}
-----------------------------------------------------
John Chrysakis
R&D Engineer,
Institute of Computer Science (ICS),
Foundation for Research and Technology-Hellas (FORTH)
Heraklion, Crete, Greece.
-----------------------------------------------------
--------------------------------------------------------------------
To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]
'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list
(use your own address!) List problems? Notify [EMAIL PROTECTED]
.
--------------------------------------------------------------------
--------------------------------------------------------------------
To unsubscribe, send the words 'unsubscribe jess-users
[EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list
(use your own address!) List problems? Notify [EMAIL PROTECTED]
.
--------------------------------------------------------------------
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
--------------------------------------------------------------------
To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list
(use your own address!) List problems? Notify [EMAIL PROTECTED]
--------------------------------------------------------------------
