[rules-users] latest event within a timeframe

[Wolfgang Laun]

Is the session being run via a single call to fireUntilHalt()?
-W

On 18/09/2013, Alexander Wolf <mail at alexander-wolf.net> wrote:
> [Drools Version 5.5.0 Final]
>
> Hey -
>
> I got an event E1 that is only valid, if the latest event E2 following E1
> within 2 minutes has the value 1
> --> I want have the rule fire 2 minutes after E1 but only if E1 is valid
>
> This is my rule:
>
> rule "inform about E1"
> when
> 	//event (T1) is the initial trigger
> 	$event1 : Event(type == EventType.T1)
> 	//there is an event (T2) with value 0 between 0,2m after doorClosed
> 	$event2: Event(type == EventType.T2, value == 1, this after [0, 2m]
> $event1, $timestamp : timestamp)
> 	//there is no newer event (T2) within the timeframe
> 	not Measurement(type == EventType.T2, this after [0, 2m] $event1, timestamp
>> $timestamp)
> then
> 	//print info
> 	log(drools, "E1 valid");
> end
>
> An example of Events:
>
> 12:00:00  - E1
> 12:01:00  - E2 ( value = 0 )
> 12:01:10  - E2 ( value = 0 )
> 12:01:40  - E2 ( value = 0 )
> 12:01:50  - E2 ( value = 1 )
> 12:02:10  - E2 ( value = 0 )
>
> I would expect the output:   [log() does log the clock-time when my rule
> fires)
>
> 12:02:00 E1 valid
>
> But what I get is:
>
> 12:03:50 E1 valid
>
>
> So I see that the late coming E2 (@12:02:10) is correctly ignored, the rule
> result is basically correct, but the rule is fired much to late.  (actually
> 2 minutes after $event2 and not as expected 2 minutes after $event1).
>
> Could someone give me a hint what I did wrong?
>
> Regards,
> Alex
>