Re: [rules-users] Question about timing rules
To parameterize each rule's frequency, you can add an object with a
frequency property for each rule or group of rules with the same
frequency and check the frequency in the LHS against Corniels proposed
timer object. You can then modify the frequency property of these
objects and signal the rule engine that the change was made and the new
frequency will be be used to trigger the rules.
I am not sure you need to fireAllRules periodically. I think you can
just update the timer object that Corneil proposes and signal the update
to the rule engine and it will reevaluate the rules automatically.
Corneil du Plessis wrote:
It should not be an issue to have an object inserted representing the
current time and have rules checking against the object
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*From:* rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@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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