I never got an answer, any answer to this question. I really need to know if
PropertyChangeSupport actually works. Is anyone out there successfully using
it?
In one case (using "modify()") I get a NPE. In all cases, the rules run twice
unless I explicitly call "update()". Is anyone *not* seeing this behaviour?
Is anyone successfully using the PropertyChangeSupport mechanism without
explicit calls to "update()"???
Jason Smith
________________________________
From: Jason Smith
Sent: Monday, November 23, 2009 12:36 PM
To: rules-users@lists.jboss.org
Subject: Rule runs twice without explicit call to update($fact).
My colleague has confirmed that this behavior has been around since Drools 4,
and it continues to be a problem for Drools 5.0.1 and 5.1.0.M1, assuming it's a
problem and not working as intended.
$fact.setPath("...") implements the correct PropertyChangeSupport mechanism for
Drools. At least Drools is using it and responding mostly as expected.
This runs once:
rule "Constrain to owner or published to public"
when
$fact : ListFact(
$path : path not matches ".*owner.*",
noopResponse == true
)
$model : Model()
then
modify($fact)
{
setPath($fact.getPath() + "[owner]")
}
update($fact);
end
This runs twice:
rule "Constrain to owner or published to public"
when
$fact : ListFact(
$path : path not matches ".*owner.*",
noopResponse == true
)
$model : Model()
then
modify($fact)
{
setPath($fact.getPath() + "[owner]")
}
end
If I don't use modify(...) and simply change the $fact bean path property, the
same thing occurs. If I explicitly call update($fact), the rule runs once. If
I don't it runs twice.
I get "/path[owner][owner]" when I actually wanted "/path[owner]", because it
ran twice, not once.
Why doe update(...) work differently from the PropertyChangeSupport
mechanism??? Shouldn't I be able to depend on Drools to run this rule only one
time?
I am, admittedly, a bit of a noob at this, but I ran this by my local Drools
resident expert, and he doesn't know the answer either.
Thanks so much!
Jason Smith
Software Engineer
InfoTrust Group, Inc.
500 Discovery Parkway, Suite 200
Superior, CO 80027
Office 303-627-6571
Fax 303-666-6711
Email jsm...@infotrustgroup.com<mailto:jsm...@infotrustgroup.com>
WEB www.infotrustgroup.com<http://www.infotrustgroup.com/>
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