[rules-users] [FUSION] Detect the absence of an event when you don't know that the event is missing.

[Tina Vießmann]

Brainstorming is just fine. ;-)
Your idea is interesting. I will think about it. Thank you, Edson.


>     Tina,
>
>     Just brainstorming here... would something like this work for you?
>
> $count : Number( intValue<  20 ) from accumulate(
>      MyEvent( ...constraints... ) over window:last( 150 ),
>      count( 1 ) )
>
>     So the above pattern triggers if you have less than 20 events in
> the last 150...
>
>     Edson
>
> 2010/10/22 Tina Vießmann<tviessmann at stud.hs-bremen.de>:
>> Hi,
>>
>> I'm working on a use case where I want to know if 20 events with a
>> specific value are contained in at maximum the last 150 events. So far I
>> know what have to do. ;-)
>> My problem is that as extension to my condition, the rule shall also
>> trigger if one ore more events are missing. But I don't know the time
>> interval with which the events arrive, so that I don't know when a new
>> event should arrive and by implication I don't know about the absence of
>> an event.
>>
>> In our environment events arrive in "counts" and not in a specific time
>> interval as e.g. ever 1 second.  So we talk about the last two or 150
>> counts if we talk about the last two ore 150 data packages received.
>> Yes, behind a count always is a time interval, but only the data source
>> knows about the time interval. My recipient doesn't
>> Also the data of a data package is inserted in the working memory
>> independently, so that I have e.g. 10 data events instead of a single
>> package event.
>> (Now that you know that, my first sentence would be correctly: I want to
>> know if 20 counts of the max. last 150 counts have contained a specific
>> event.)
>>
>> If my explanation (or my attempt to explain) is difficult to understand,
>> please ask me what you want to know.
>>
>> I would be very happy about any ideas.
>>
>> Thank you.
>> Tina
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>
>