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

[senyatur]

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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