Edson, Michal,
thank you for your answers. If I understand well, Drools can't recognize
if the $fact2 has been changed by the current rule or not.
Anyway, I found such a behaviur as a bit confusing, so my second
question is, is it a desirable behaviour? And is it going to be changed
or left as is?
Best regards
Przemyslaw
Edson Tirelli pisze:
Michal is correct. Every time a "from" expression is executed,
Drools does not know if a result for the expression is new or not and it
creates a new fact handle, bypassing the no-loop.
[]s
Edson
2009/2/13 Michal Bali <[email protected] <mailto:[email protected]>>
This is what I think is going on:
when you call update($fact1) it will first retract $fact1 which in
turn retracts $fact2, the $fact1 is then inserted again which cause
another 'from' evaluation and a NEW $fact2 is pulled -> no-loop
doesn't work because Drools sees it as different data
I am just guessing here ...
On Fri, Feb 13, 2009 at 9:12 AM, Przemysław Różycki
<[email protected] <mailto:[email protected]>> wrote:
Hello,
Doesn't really anyone have any logical explanation of why such a
rule loops?
To remind the rule:
rule "Hello World"
no-loop
when
$fact1 : MyFactBean1( )
$fact2 : MyFactBean2( ) from $fact1
then
System.out.println("Fired!!!");
update($fact1);
end
If I don't use 'from' everything is fine.
I really didn't find in a documentation, that 'from' causes any
special behaviour of the rule looping.
Best regards,
--
Przemysław Różycki
AMG.net, A Bull Group Company
ul. Łąkowa 29
90-554 Łódź
www.amg.net.pl <http://www.amg.net.pl>
Przemysław Różycki pisze:
Thanks for answer, Vikrant, but I don't think so. I have
always used no-loop without any additions and it worked
(when I didn't use from). BTW, if you comment a condition
with from, then the rule does not loop. I also checked with
"no-loop true" and result is the same.
Best regards,
Przemek
Vikrant Yagnick pisze:
I have to quickly recheck the documentation by I think
you have to write "no-loop true". Just writing no-loop
defaults to false I guess.
-----Original Message-----
From: [email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] On Behalf
Of Przemyslaw Rózycki
Sent: Tuesday, February 10, 2009 3:24 PM
To: Rules Users List
Subject: [rules-users] Rules with from always loops
(Drools 4.0.7)
Hello,
why does such a rule always loop? Even if no-loop is used?
rule "Hello World"
no-loop
when
$fact1 : MyFactBean1( )
$fact2 : MyFactBean2( ) from $fact1
then
System.out.println("Fired!!!");
update($fact1);
end
The full code of my test application and drl is attached.
Best regards,
--
Przemysław Różycki
AMG.net, A Bull Group Company
ul. Łąkowa 29
90-554 Łódź
www.amg.net.pl <http://www.amg.net.pl>
MASTEK LTD.
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Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
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