[rules-users] Accumulate function, events and stream processing

[Juanker Atina]

I need your help to put to work an accumulate function.

So, i will introduce several facts into working memory (StateEvent, which i
declare as event) and i want to accumulate the last five values.

I have changed a property in drools.default.rulebase.conf
(drools.eventProcessingMode = STREAM) to make the engine works in stream
mode.

And my rule is:


declare StateEvent
    @role( event )
end

rule "Testing"

when
    $total : Number() from accumulate(
        StateEvent(itemName=="Temperatura", $val : newState) over
window:length( 5 ),
        sum ( ((DecimalType)$val).toBigDecimal().doubleValue() ) )
then
    #actions
end


But it's not working, as the value of $total is 0.0, no matter what i do,
and the rule is firing with every fact in the working memory.

Any help will be appreciated.
Thanks
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