[rules-users] Slinding window !

[Edson Tirelli]

   This is correct and works as designed. Please note that a direct event
expiration does NOT cause a rule to be cancelled. So using sliding windows
in isolation will be useless:

X() over window:time(...)

   Will activate and fire for every single X, and that is correct.

   Now, if you use sliding windows in combination with other CEs, then the
results will be affected by the sliding window. This is perfectly clear
with accumulate/collect, but also happens when you are using multiple
patterns. For instance:

X() over window:time( 1m )
Y() over window:time( 1m )

   This will create pairs of [X,Y] only for the X's and Y's that happened
in the last minute, as intended. An X that just happened will not match an
Y that happened 2 minutes ago.

   Edson



On Tue, Feb 28, 2012 at 7:18 AM, Wolfgang Laun <wolfgang.laun at gmail.com>wrote:

> I can confirm (using 5.3.0) that after
>    advance the clock to 1
>    insert an event with timestamp 1,
>    advance the clock to 3
>    insert another one with timestamp 3
>    advance the clock to 4
>    fire all rules
> a rule with
>   Event() over window:time( 2s )
> will fire twice (2 times). There is no difference between STREAM and CLOUD
> mode.
>
> Indeed, the documentation (Fusion, 2.6.1, Sliding Time Windows)
> appears to tell another story:  "Sliding Time Windows allow the user
> to write rules that will only match events occurring in the last X
> time units." This is quite explicit.
>
> Also, please note that firing all rules after each insertion produces
> the expected results; the rule firings at T=3 and T=4 show only one
> event in the window.
>
> Even more surprisingly, running a rule that collects over a sliding
> window works as intuitively expected:
>   $l: List() from collect( Event() over window:time( 2s ) )
> Here the List will never contain more than one element, even when the
> simple pattern (shown above) fires twice.
>
> -W
>
>
>
>
>
> On 28/02/2012, Hassan <azbakh01 at gmail.com> wrote:
> > Hi guys,
> >
> > While trying to understand how slinding window work, I realize that all
> > exemples are given with "accumulate" or "collect" functions , I din't
> know
> > why ??
> >
> > $a : List() from collect(Event1() over window:time(2s) from entry-point
> > "point")
> >   // work
> >
> >
> > Bur why
> >
> > $a : Event1() over window:time(2s) from entry-point "point")
> >
> >
> > doesn't work ??!
> >
> > Thanks,
> > Youssef AZBAKH
> >
> > --
> > View this message in context:
> > http://drools.46999.n3.nabble.com/Slinding-window-tp3783772p3783772.html
> > Sent from the Drools: User forum mailing list archive at Nabble.com.
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
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>



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