[rules-users] Why this rule fires immediately ?

[Mark Proctor]

Think about the logic you have written.

length(3) does not mean that it must have 3, but that it is the last 
three. So it could be 0, 1, 2 or 3 in length.

As soon s you have 1, 2, or 3 insertions if any one of those creates an 
average of > 30 the rule fires.

So you are inserting  a ZZZBean that creates an average, even if it's an 
average with a count of 1, over 30.

Mark
On 18/10/2011 07:20, eskomk wrote:
> Hi all,
>
> Here is the rule:
>
> CLIP -->
> rule "ZZZOver30" dialect "mvel"
>
> when
>      $tsb : ZZZBean($prof : profileID)
>      $avg : Number( doubleValue>  30 ) from accumulate(
>          ZZZBean( $tempr : temperature, profileID == $prof) over
> window:length( 3 ),
>          average( $tempr ) )
> then
>      // do something
> end
> CLIP<--
>
> The intention as you can see is that the rule fires if the average
> temperature rises above 30 degrees (of Celsius) in some measuring period.
> For testing purposes the rule takes a specific number of temperatures
> (window:length), in production environment the window will be time
> (window:time(Xm)).
>
> My question is, why this rule fires immediately after drools-expert is
> started ?
> Is there something wrong in syntax ?
>
> In startup there are obviously no objects of this kind (ZZZBean) in Working
> Set's memory, so it really shouldn't fire.
>
> We are running Drools ver. 5.1.1 as a web service on top of apache, and the
> facts (events) are fed to Drools via REST interface as XML.
>
> thanks and regards,
> Esko
> -----
> Esko Hujanen
> www.ebsolut.fi
>
>
> --
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