[rules-users] Evaluation of the of rules with 'window:length' event windows

[Vincent LEGENDRE]

Seems that there is a confusion here ...

window:length(X) is constraining the events timestamps to be in a time-windows of length X (in seconds).

To contrain the number of accumulated facts, it must be done by adding a constraint in the resulting list :

$list : ArrayList(size > Nb) from accumulate(Class1($a:a) over window:length(X) from entry-point "Point" ...


@wolfgang : if you use an internal counter in the accumulate, how can you test it internaly ? return empty (or null) list if max not reached ?
$list : ArrayList() from accumulate($obj : Class1($a:a) over window:length(X) from entry-point "Point" 
                          init ( ArrayList list = new ArrayList(); ),
                          action ( list.add($obj); ),
                          return ( if (list.size() < Nb {return null;} else {return list;} ))



----- Mail original -----
De: "Wolfgang Laun" <wolfgang.laun at gmail.com>
À: "Rules Users List" <rules-users at lists.jboss.org>
Envoyé: Mercredi 16 Mai 2012 13:02:46
Objet: Re: [rules-users] Evaluation of the of rules with 'window:length' event windows

Accumulate the count of elements (in addition to whatever you
accumulate) and test the result as being == X. As of (IIRC) 5.3.0, you
can write multi-function accumulates.
-W

On 16/05/2012, senyatur <senya.touretski at emc.com> wrote:
> Hi guys
> We are using Drools for event processing. So we have rules that, for
> instance, put accumulation function over window of number of elements (not
> time).
> ... from accumulate(Class1($a:a) over window:length(X) from entry-point
> "Point"...
> The problem we are experiencing that when evaluating the rule when there
> are
> *less* elements than X (window length) the accumulation function is still
> calculated which leads to wrong results.
> Is there a way in Drools to restrict firing of this type of rules when
> there
> are less than 'length' elements in the session?
> Thanks
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Evaluation-of-the-of-rules-with-window-length-event-windows-tp3996829.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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