[rules-users] No inferred expiration when correlating events in Drools Fusion

[wayne metcalfe]

This might be an option:
http://docs.jboss.org/drools/release/5.3.0.Beta1/drools-fusion-docs/html/ch02.html#d0e1288

> On 19 Jan 2014, at 20:57, "Alexandre Gattiker" <agattik at gmail.com> wrote:
> 
> Hello,
> 
> I am trying to use Drools Fusion (5.6.0 or 6.0.1) to correlate events, but can't get the internal mechanism for expiring events to work in my rule.
> 
> I made up a simple example that detects duplicate messages over a short time window. The rule below seems to work fine, but facts accumulate indefinitely in the working memory. Changing window:length(1) to window:time(10s) does not solve the issue.
> 
> declare DataEvent
>     @role(event)
> end
> rule "Detect duplicates"
> when
>    DataEvent ( $text: text ) over window:length(1)
>    ArrayList( size >= 2 ) from collect( DataEvent( text == $text )  over window:time( 10s ) )
> then
>     System.err.println("Duplicate detected");
> end
> 
> Now, if I change my condition to the following, I see that facts automatically expire and are retracted after 10 seconds.
> 
> ...when
>    ArrayList( size >= 10 ) from collect( DataEvent( )  over window:time( 10s ) )
> then...
> 
> Many thanks in advance.
> 
> 
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