[rules-users] Question about timing rules

[Corneil du Plessis]

It should not be an issue to have an object inserted representing the
current time and have rules checking against the object

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Bagwell, Allen F
Sent: 05 June 2008 17:34
To: Rules Users List
Subject: [rules-users] Question about timing rules


 
Another noob question:
 
Is there a generally understood way of implementing the concept of a time
interval rule?
 
That is, lets say I have a Drools-enabled client which is constantly
receiving information from outside resources. Most of this data (and the
consequences of its changes) is time sensitive, so I'm calling the
fireAllRules() method in a loop every minute.
 
And now, let's say I have a rule that in addition to being driven by
incoming data changes has to be linked to a repeating clock interval or
synched with wall time such that the rule only activates and fires if the
data meets certain parameters AND it's been exactly 1 hour since the last
check or that it will fire at the top of every wall time hour (1 PM, 2PM, 3
PM, etc.).
 
Furthermore, timing may change. A successful rule activation and firing
might do something like "now change this timing so that for the next 24
hours, this rule must be examined every 30 minutes instead of every hour". 
 
My initial reading of the Drools documetation I came across the Duration,
and Date-* keywords. Their descriptions didn't seem to fit the bill.
 
I ask this because our old rules engine software that has been retired to
obsolescence allowed this kind of thing to be easily set up. Coming at it in
the Drools world seems a lot more challenging.
 
Thoughts? Examples?
 
-Allen
 
 
 
 
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