[rules-users] Time constrained rules

[Jason Vasquez]

Hi all,

I need a set of rules to fire on time-based criteria.  I have a  
'Clock' object in working memory, along with an unknown number of  
'TestObject's, each of which can report its 'age'.  At some interval,  
I modify the Clock object in working memory, and then fire the  
rules.  As a start (which I'm certain shouldn't work anyway), I'm  
playing around with a rule like this:


rule remove objects older than 2 seconds
when
Clock()
$to : TestObject( ageInMillis  2000 )
then
	System.out.println(new java.util.Date() +  = Retracting  +  
$to);

retract($to);
end

It appears that the RHS is never executed, presumably because  
TestObjects were not modified.  (I'm new to JBossRules, so I'm  
unclear on that )


Alternatively, I could just remove the Clock() constraint and iterate  
an external collection of TestObject's, marking each object as  
modified.  Just looking for the best way here...


Thanks,
-jason

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Re: [rules-users] Time constrained rules

[Jason Vasquez]

Thanks Edison, that will do the trick.


On Jul 6, 2007, at 2:52 PM, Edson Tirelli wrote:



   Jason,

   Yes, the engine does not see any change in TestObject until you  
call update() for it.

   In your case, I would play that a bit different:

rule remove objects older than 2 seconds
when
Clock( $cur : currentTime )
$to : TestObject( creationTime  ( $cur - 2000 ) )
then
System.out.println(new java.util.Date() +  =  
Retracting  +

$to);
retract($to);
end

   This way you only need to update your clock object and not your  
testObjects.


   []s
   Edson




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