[rules-users] Drools fusion forward chaining

[Edson Tirelli]

   Not sure what is the problem you see...

$a : Event()
$b : Event( this after $a )
$c : Event( this after $b )

    []s
    Edson

2009/8/24 Ahmed Hafsi <hafsi at fzi.de>

> Hi guys ,
>
> I am using the lastest version of DROOLS , i.e 5.0 , I am trying to achieve
> forward chaining with the new features of Fusion
> I was looking for examples about the different operators and how to make
> use
> of them but the broker example does not mention in it's DRL file any time
> related operators , i.e after , meets ...
> I would be grateful if you guys provide me with a simple example of forward
> chaining (sequence)
> My goal to achieve is to implement something like this :
> CmplxEvent :- a and then b and then c
>
> my drools rule is :
>
> rule "cmplx0"
> when
>  $a : Event()
>  $b : Event()
>  Event(this after $b && $b after $a)
> then
>  //whatever
> end
>
> however this does not work , it complains about "unable to create field
> exatractor"
> Event is an event that I have declared using declare Event and then the
> metadata @event as described in the docs.
>
>
> Thanks for help.
> Khalil Hafsi
>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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