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<TITLE>RE: How to write a rule that fires when it matches against specific facts in working memory.</TITLE>
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<P><FONT SIZE=2>Edson,<BR>
<BR>
That worked beautifully !<BR>
<BR>
Drools is looking more and more promising for what we need to do.<BR>
<BR>
Thanks for all your help,<BR>
<BR>
Gurvinder<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: Edson Tirelli-4 [via Drools - Java Rules Engine] [<a href="/user/SendEmail.jtp?type=node&node=2381946&i=0" target="_top" rel="nofollow">[hidden email]</a>]<BR>
Sent: Sat 1/29/2011 10:59 PM<BR>
To: Gurvinder Narula1<BR>
Subject: Re: How to write a rule that fires when it matches against specific facts in working memory.<BR>
<BR>
<BR>
  Up to Drools 5, the accumulate function API supports only a single argument to the function, but that argument can be an array or a list. So what I do on my own implementations is to pass the $param as one element of the array and $o as the other. It is not ideal, but it is how you can do that in Drools 5. In Drools 6 I will change the API to support multiple parameters, but I've been postponing that because when I do it, it will break existing implementations of the interface.<BR>
<BR>
  Anyway, if you are using the MVEL dialect, creating a list is as simple as wrapping it in [ ], as you could see in my previous e-mail.<BR>
<BR>
$options : List() from accumulate(Â<BR>
    $op : Option(),<BR>
    matchAll( [ ${param}, $op ] ) )<BR>
<BR>
   Edson<BR>
<BR>
2011/1/29 groovenarula <[hidden email]><BR>
<BR>
<BR>
<BR>
Edson,<BR>
<BR>
I did manage to use the 'CollectSetAccumulateFunction' as a template for the<BR>
MatchAll and have also successfully 'called' the accumulate function from a<BR>
rule written in a .drl file. But I'm stuck at one point - how to send the<BR>
value of $param to the accumulate method ? From what I understand, the<BR>
accumulate method is invoked for each fact - so if I write<BR>
<BR>
  MatchAll( $o ) it will invoke the accumulate method and passing $o fact<BR>
to the method via the 'Object value' parameter.<BR>
<BR>
So far so go, however, I'm stuck on how to pass the value of '$param' to the<BR>
accumulate method (or any other method like init, getResult for that<BR>
matter).<BR>
<BR>
One option I can think of is to change the definition of the Option fact to<BR>
include a 'param' field and then write a rule that sets the value of that<BR>
field to $param (so every Options param field would get set to the value of<BR>
$param). I can then extract that in the accumulate method it self. But is<BR>
there a better way that I might be missing ?<BR>
<BR>
Thanks in advance,<BR>
Gurvinder<BR>
<BR>
--<BR>
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--<BR>
 Edson Tirelli<BR>
 JBoss Drools Core Development<BR>
 JBoss by Red Hat @ www.jboss.com<BR>
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