3:07 a.m.
See inline annotations.
On 13 August 2010 04:34, Manav <manav7574(a)yahoo.com> wrote:
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?
Same as before:
$urslt : UserResult (id == $id <http://usr.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 <http://usr.id/>;, langScore.keySet not
contains $name )
then
modify( $usrlt ){
setLangScore($name, $_score)
}
end
HTH
--W
> ----- Original Message ----
> From: Greg Barton <greg_barton(a)yahoo.com > To:
Manav <manav7574(a)yahoo.com>; Rules Users List <
> rules-users(a)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(a)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 50
> when
> User (language.keySet contains "French", $f_score :
language["French"])
> then
> // do something
> end
> salience 25
> when
> eval (($j_score + $f_score) > 4)
> then
> // update the same to db
> end
> Is this possible in Drools 5.x ?
> Regards,
> Manav
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Thanks for your response Greg. As you said this is what i tried to
fix the
issue
by creating a UserResult obj that has score as a property and inserting the
same
in working memory. I update the results in subsequent rules in the "then"
clause. There are some issues that i faced in this as well :-
-- In my last rule if i want to do a check on score property of my result
object in the "when" clause the score has not been updated .
-- however if i do the same check in the "then" clause it seems to work
properly.
-- I tried to overcome by doing an update in one of my rules to check if
that
would work. That however went into an infinite loop. So i used the
"lock-on-active true" property . However it seemed to work well for only
the
first user object and doesn't work for other user objects that are loaded
later.
Below is the sample rule file . If the scenario is not clear pls do let me
know
and i will send across the different drls as attachments .
salience 200
when
User ($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 true
not necessary now
> when
> User (language.keySet contains "French", $f_score :
language["French"])
> $urslt : UserResult (id == $usr.id)
salience 100
> when
> User (language.keySet contains "Japanese", $j_score :
> language["Japanese"])
> then
> // do something
> end