[rules-users] Caching results in temperory variables

[Manav]

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)
end

salience 100
lock-on-active truewhen
    $usr : User (language.keySet contains "Japanese", $j_score : 
language["Japanese"])
    $urslt :  UserResult (id == $usr.id)
then
    $usrlt.setLangScore("Japanese", $j_score); 
end

salience 50
lock-on-active truewhen
    User (language.keySet contains "French", $f_score : language["French"])
    $urslt :  UserResult (id == $usr.id)
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


----- Original Message ----
From: Greg Barton <greg_barton at yahoo.com>
To: Manav <manav7574 at yahoo.com>; Rules Users List <rules-users at 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 at 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




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