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

[Wolfgang Laun]

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
>
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