Re: [rules-users] Drools fusion forward chaining

Ahmed Khalil Hafsi Mon, 24 Aug 2009 10:11:27 -0700

Hi ,

Thanks for the reply , the code that you gave works , but what I wanted to achieve is to pack it in one "statement" , i.e :

Event(this after $b && $b after $a)

that's because I am not limited to the sequence operator , for example when I want to make a disjunction rule :
Cmplx1 :- a OR b

I can't separate the events , but I must write them packed like this ::

Event(this after $b || $b after this)

One more question :
I assume that the relation between the different statements in a rule is normal conjunction , i.e :

rule "some rule"
when
    a : ...
    b : ...
    c : ...
then
    trigger action "act"
end

would be equivalent to ::
act :- a,b,c .

I hope I am correct ?

Thanks for the help
Khalil Hafsi

Edson Tirelli wrote:

   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 <[email protected]>

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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Re: [rules-users] Drools fusion forward chaining

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