JESS: Problem with JessListener

[Henrique Lopes Cardoso]

I am stumbling for some time now with the use of a JessListener. After
many tries, I figured out that the listener does not work properly when
I bload() certain files.

Since the Rete class implements JessListener, for ease of testing I
extended it and got to the class below.
>From my experiences, if the bsave file is empty, it works fine. If I use
another bsaved file that I have, I get problems. Only the retracted
facts are being notified.

Is this a bug? What should I look for in my bsaved file?

Thanks.

Henrique

//---------------------------------------------
public class JEL extends Rete {
    public JEL() {
        super();
        // set event mask
        setEventMask(JessEvent.FACT);
        // load file
        try {
            FileInputStream fis = new FileInputStream("somefile.bsave");
            bload(fis);
            fis.close();
        } catch (ClassNotFoundException cnfe) {
            cnfe.printStackTrace();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
   
    public void eventHappened(JessEvent jev) {
        System.out.println("EVENT:" +
JessEvent.getEventName(jev.getType()));
        switch(jev.getType()) {
            case JessEvent.FACT | JessEvent.REMOVED:   // retraction
                Fact whatWasRetracted = (Fact) jev.getObject();
                System.out.println("- - -" + whatWasRetracted);
                break;
            case JessEvent.FACT:   // assertion
                Fact whatWasAsserted = (Fact) jev.getObject();
                System.out.println("+ + +" + whatWasAsserted);
                break;
        }
    }
   
    public static void main(String args[]) {
        JEL jel = new JEL();
        try {
            jel.assertString("(qwe)");
            jel.retractString("(qwe)");
            jel.assertString("(asd)");
        } catch(JessException je) {
            je.printStackTrace();
        }
    }
   
}
//----------------------------------------------



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