[rules-users] Fusion - Why needs the stream time-ordered input

[Edson Tirelli]

    Tina, the requirement is to avoid corner cases with sliding windows, for
instance. Imagine you have a sliding window of 30 min, calculating
averages... if events arrive out of order, they might generate odd results
on the average calculation along the timeline and might remain in the window
for less than 30 minutes.

    Edson

2010/8/4 Tina Vießmann <tviessmann at stud.hs-bremen.de>

> Hi,
>
> I'm restarting getting to know Drools (Fusion). Now I'm thinking about
> the stream processing mode.
>
> The documentation says the events must be time-ordered - they must be
> insert into the stream in the order in which they are occur so. Am I
> correct that it has to be that way, because the timestamps given to the
> events when they are insert into the working memory shall represent the
> correct order?
> My events already have an attribute representing their timestamp. I've
> told that the engine using the @timestamp(...) command.
> In that case, is it important anyway that the events are insert
> time-ordered?
>
> I'm thankful for any explanations and advises. Thank you :)
>
> Grettings
> Tina
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-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com
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