I've figured it out.
It's a long story...
There is no problem with JessListener or JessEvents (at least not directly).
It is hard to explain, or even to understand, but I'll give it a shot.
My bsaved file had Userfunctions, which were Serializable. But the
userfunctions had a reference to an Object whose existence was lost
before the test with bloading was made. Although the userfunctions were
*not* used after bload and while doing the events tests, this was
causing the problem. Remember that the problem was not getting asserted
fact events, only retracted fact events. :|
I cannot explain it better... It is hard to understand. (I am not
giving you the full details of my efforts, which are quite intricate.)
Anyway, I solved it by removing the Java userfunctions before bsaving,
and (optionally, since I am not using it in these tests) adding them
after bloading.
Now I got to a potentially related problem, but since it is different
from this one, I am reporting it in a separate thread.
Henrique
Ernest Friedman-Hill wrote:
> It's a puzzle to me, too. If you want to send me (not the list) the
> bsaved file, and let me know what version of Jess you're working with,
> I can have a look at it.
>
> On Jul 5, 2007, at 8:08 AM, Henrique Lopes Cardoso wrote:
>
>> No, that is not the case.
>> I tried this:
>> jel.assertString("(qwe)");
>> jel.retractString("(qwe)");
>> jel.assertString("(qwe)");
>>
>> and it still doesn't work. I only get the retract event.
>> There must be something else going on in the bsaved file. Any clue?
>>
>> Henrique
>>
>>
>> Ernest Friedman-Hill wrote:
>>> One explanation consistent with your observations is that the bsaved
>>> file already contains (qwe) and (asd) facts. If you attempt to assert
>>> a fact that already exists in working memory, the assert method
>>> returns FALSE and no event is sent.
>>>
>>>
>>> On Jul 5, 2007, at 5:47 AM, Henrique Lopes Cardoso wrote:
>>>
>>>> I just extended Rete to make the example simpler. I also tried it with
>>>> an independent JessListener implementing class, but the problem is
>>>> the same.
>>>>
>>>> I tried to do Rete.addJessListener() after bload, just as you
>>>> suggested,
>>>> but the problem remains.
>>>>
>>>> So, I ask again: what could be wrong in my bsaved file that prevents
>>>> some JessEvents from being notified?
>>>>
>>>> Henrique
>>>>
>>>>
>>>> Jonathan Sewall wrote:
>>>>> I didn't extend Rete just to create a JessListener, but I did find
>>>>> that I needed to reregister my listeners after bload.
>>>>> Henrique Lopes Cardoso wrote:
>>>>>> 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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>>>>>>
>>>>>>
>>>>>
>>>>> --------------------------------------------------------------------
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>>>>
>>>> --
>>>> ----- - - - - - - - - - - - -
>>>> Henrique Lopes Cardoso
>>>> DEEC/FEUP
>>>> Rua Dr. Roberto Frias | 4200-465 Porto
>>>> PORTUGAL
>>>> (+351)225081400 ext.1315
>>>> [EMAIL PROTECTED] | www.fe.up.pt/~hlc
>>>> ----- - - - - - - - - - - - -
>>>>
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>>>
>>> ---------------------------------------------------------
>>> Ernest Friedman-Hill
>>> Advanced Software Research Phone: (925) 294-2154
>>> Sandia National Labs FAX: (925) 294-2234
>>> PO Box 969, MS 9012 [EMAIL PROTECTED]
>>> Livermore, CA 94550 http://www.jessrules.com
>>>
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>>>
>>
>> --
>> ----- - - - - - - - - - - - -
>> Henrique Lopes Cardoso
>> DEEC/FEUP
>> Rua Dr. Roberto Frias | 4200-465 Porto
>> PORTUGAL
>> (+351)225081400 ext.1315
>> [EMAIL PROTECTED] | www.fe.up.pt/~hlc
>> ----- - - - - - - - - - - - -
>>
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>
> ---------------------------------------------------------
> Ernest Friedman-Hill
> Advanced Software Research Phone: (925) 294-2154
> Sandia National Labs FAX: (925) 294-2234
> PO Box 969, MS 9012 [EMAIL PROTECTED]
> Livermore, CA 94550 http://www.jessrules.com
>
> --------------------------------------------------------------------
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>
--
----- - - - - - - - - - - - -
Henrique Lopes Cardoso
DEEC/FEUP
Rua Dr. Roberto Frias | 4200-465 Porto
PORTUGAL
(+351)225081400 ext.1315
[EMAIL PROTECTED] | www.fe.up.pt/~hlc
----- - - - - - - - - - - - -
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