On 13 August 2010 04:34, Manav
<manav7574@yahoo.com> wrote:
Thanks for your response Greg. As you said this is what i tried to fix the issue
by creating a UserResult obj that has score as a property and inserting the same
in working memory. I update the results in subsequent rules in the "then"
clause. There are some issues that i faced in this as well :-
-- In my last rule if i want to do a check on score property of my result
object in the "when" clause the score has not been updated .
-- however if i do the same check in the "then" clause it seems to work
properly.
-- I tried to overcome by doing an update in one of my rules to check if that
would work. That however went into an infinite loop. So i used the
"lock-on-active true" property . However it seemed to work well for only the
first user object and doesn't work
for other user objects that are loaded later.
Below is the sample rule file . If the scenario is not clear pls do let me know
and i will send across the different drls as attachments .
salience 200
when
User ($id : id)
then
UserResult urslt = new UserResult ($id);
insert ($id)
Here I'd expect
insert( urslt );
Also, to be on the safe side, I always add a pattern
not( UserResult( id == $id ) )
to avoid the creation of multiple UserResult's for the same User (if there's a minimal chance it might be modified during the following fusillade).
end
rule "JapaneseScore"
salience 100
lock-on-active truewhen
$usr : User (language.keySet contains "Japanese", $j_score :
language["Japanese"])
I prefer to add a binding of User's id: User( $id == id )
$urslt : UserResult (id == $usr.id)
so I can simplify this. Add a constraint to avoid looping:
$urslt : USerResult( id == $id, langScore.keySet not contains "Japanese" )
then
$usrlt.setLangScore("Japanese", $j_score);
update( $usrlt );
end
rule "FrenchScore"
salience 50
Why not 100?
lock-on-active true
not necessary now
when
User (language.keySet contains "French", $f_score : language["French"])
$urslt : UserResult (id == $usr.id)
Same as before:
$urslt : UserResult (id == $
id, langScore.keySet not contains "French" )
then
$usrlt.setLangScore("French", $_score);
update ($usrlt);
end
salience 25
when
UserResult (score > 4) // does not work
then
// if ($usr_rslt.getScore() > 4) --> works well
// update the db
end
Regards,
Manav
The repetition of rules JapanesScore and FrenchScore could be avoided by inserting static objects
insert( new Language( "Japanese" ) );
insert( new Language( "French" ) );
// more of the same
rule "PolyglottScore"
salience 100
when
Language( $name : name )
User ($id : id, language.keySet contains $name", $f_score : language[$name])
$urslt : UserResult (id == $
id, langScore.keySet not contains $name )
then
modify( $usrlt ){
setLangScore($name, $_score)
}
end
HTH
--W
----- Original Message ----
From: Greg Barton <greg_barton@yahoo.com>
To: Manav <manav7574@yahoo.com>; Rules Users List <rules-users@lists.jboss.org>
Sent: Thu, August 12, 2010 9:29:28 PM
Subject: Re: [rules-users] Caching results in temperory variables
You must either update an existing working memory object or insert a new working
memory object with the results. That's how rules communicate with each other.
GreG
On Aug 12, 2010, at
10:31 AM, Manav <manav7574@yahoo.com> wrote:
Hi,
I am using the version 5.x of drools and i have a scenario where i want to hold
the result of
a test in one rule to a temperory variable . This result will then be used in
another rule that will be fired
later in the sequence .
For ex :
salience 100
when
User (language.keySet contains "Japanese", $j_score : language["Japanese"])
then
// do something
end
salience 50
when
User (language.keySet contains "French", $f_score : language["French"])
then
// do something
end
salience 25
when
eval (($j_score + $f_score) > 4)
then
// update the same to db
end
Is this possible in Drools 5.x
?
Regards,
Manav