[rules-users] Semantic of rules with not and coincide

[Wolfgang Laun]

Coincides is symmetric in time. You might want to use before or after.
-W


On 06/12/2013, IK81 <ml at kofler.me> wrote:
> Dear all,
>
> I am currently stuck with a problem concerning the use of not and
> conincide. I want to analyze a stream of error code events from a set of
> devices and detect the following situations. Every event has a timestamp
> (long), a device id (String) and an error code (String).
>
> What I want to detect is the following
> - If I get two events, one with code C1 and one with C2 from a single
> device within 1 minute, it represents a special event combination. The
> order of their appearence is not relevant.
> - If I just get C1 (without the C2 within the time frame), just report
> C1
> - If I just get C2 (without the C1 within the time frame), just report
> C2
>
>
> I can successfully detect the special event combination with the
> following rule
>
> rule "Detect combination"
> when
>      $e1 : Event ($d: device, code == "C1")
>      $e2 : Event (device == $d, code == "C2", this coincides [1m] $e1)
> then
>      ... do some output
> end
>
>
> Then I tried to implement the detection of C1 only as follows
>
> rule "Detect code C1"
> when
> 	$e1 : Event ($d: device, code == "C1")
> 	not ( $e2 : Event (device == $d, code == "C2", this coincides [1m]
> $e1))
> then
>      ... do some other output
> end
>
> My understanding of the rule is that it should fire, if I get the event
> with code C1 and there is no other event with error code C2 for the same
> device that happens within one minute before and after the C1 event. To
> my surprise, the rule fires immediately when I insert an event with
> error code C1. Shouldn't the implementation wait at least 1 minute to be
> sure that no C2 error event will be inserted?
>
>
> BTW this is how I insert the events in my test case:
>
> 	clock.advanceTime(70,  TimeUnit.SECONDS);
> 	FactHandle handle1 = ksession.insert( new Event(65000, "A", "C1") );
> 	ksession.fireAllRules();
> 	clock.advanceTime( 10, TimeUnit.SECONDS );
> 	FactHandle handle2 = ksession.insert( new Event(75000, "A", "C2") );
> 	ksession.fireAllRules();
> 	clock.advanceTime( 2, TimeUnit.SECONDS );
>
> And this is mainly the output I get:
>
> detected code C1 @ 70000
>    event id=44b895e5-7287-404b-8204-3de5690b2360 timestamp=65000
> device=A code=C1
> detected combination @ 80000
>    event id=44b895e5-7287-404b-8204-3de5690b2360 timestamp=65000
> device=A code=C1
>    event id=fc89715b-fc30-4b12-ab31-a3884dcd4886 timestamp=75000
> device=A code=C2
>
> Any ideas concerning an alternative solution are highly welcomed.
>
> Thanks,
> Ingo
>
>
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