[rules-users] Cron Rule doesn't work

[Mark Proctor]

There must be a mechanism for timers to fire. That is either fire fireAllRules or use fireUntilHalt, rules should not fire outside of those two things. Even if there is a timer, it simply puts the activation onto the agenda, so it fires with the fireAllRules or fireUntilHalt life cycles.

Mark
On 20 Jun 2013, at 06:05, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:

> Experiments (5.[2345].0) show that it's not necessary to use
> fireUntilHalt. A rule like
> 
> rule "Rule 123"
> timer (cron: 0/15 * * * * ?)
> when
> then
>  System.out.println("Fired 123!");
> end
> 
> keeps the timer task alive even when the stateful session isn't
> evaluating rules. Just don't dispose() the session.
> 
> @Mark: Not executing a due timer when a session is idle would be a
> bug, or at least a very severe restriction on the way you run a
> session with timers. Not everybody is happy with a session continually
> alive with fireUntilHalt.
> 
> -W
> 
> On 20/06/2013, Mark Proctor <mproctor at codehaus.org> wrote:
>> try fireUntilHalt, or it won't be able to fire the events as they happen.
>> 
>> Mark
>> On 20 Jun 2013, at 02:04, Andy <reliable.android at gmail.com> wrote:
>> 
>>> *Issue 1*
>>> 
>>> Steps:
>>> 1. Add a Rule with cron + when condition always true.
>>> 2. FireAllRules
>>> 
>>> Expected: Cron to fire every 15 seconds
>>> 
>>> Rule:
>>> "
>>> rule "Rule 123" dialect "mvel"
>>> timer (cron:0/15 * * * * ?)
>>> when
>>> eval(true)
>>> then
>>> System.out.println("Fired!");
>>> end
>>> "
>>> 
>>> Other Details:
>>> "
>>>   ...(initialized kagent using changeset)
>>> 		kbase = kagent.getKnowledgeBase();
>>> 		ksession = kbase.newStatefulKnowledgeSession();
>>> 		ksession.fireAllRules();
>>> "
>>> 
>>> The same rule works fine when I insert some object.
>>> 
>>> *Issue 2*
>>> Inserting some object and then adding a second cron makes the previous
>>> cron
>>> fire twice, then thrice and so on...
>>> 
>>> Is statefulknowledge session right choice for me?
>>> Are there any known issues with cron rules?
>>> 
>>> Any help/advice is appreciated. Thx!
>>> 
>>> 
>>> 
>>> --
>>> View this message in context:
>>> http://drools.46999.n3.nabble.com/Cron-Rule-doesn-t-work-tp4024399.html
>>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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>> 
>> 
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