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

[Edson Tirelli]

   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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-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com