I am trying to do something like this:

train Fact needs to be updated if GPS events arrive, to update its GPS Location. Now, if there are no GPS events for 40 seconds in a row, the confidence level of train drops by 5 (initial 100)

Code:

rule "ConfidenceLevel_sliding" dialect "mvel"  
when 
$GPSEvent : GPSEvent($eventTrainID:trainID, $eventGPSLocation:GPSLocation) over window:time(40s) 
$train : Train(trainID==$eventTrainID,$confidenceLevel:confidenceLevel  ) 
not(GPSEvent(this != $GPSEvent,trainID==$eventTrainID)) 
then 
$train.confidenceLevel=$confidenceLevel-5 
System.out.println( "updated train information for trainID:" +$train.trainID +"\nnew Confidence Level:"+$train.confidenceLevel );  
end

now, the above is working fine when i send 2 GPSEvents within required time (40 Secs), and the rule fires if i fire second GPS event after 40 seconds

Code:

kSession.insert(train1); 
kSession.insert(GPSEvent1); 
clock.advanceTime(10, TimeUnit.SECONDS); 
kSession.insert(GPSEvent2);

But then it doesnt continue firing every 40 seconds. I want the rule to decrease the confidence level every 40 seconds of not receiving a GPS Event for that train.

Examples (what we want to achieve):

1) I insert a train with confidence level 100, and never insert a GPS Event for the train, then every 40 seconds the confidence level should go down by 5

2) I insert a train with confidence level 100, insert a GPS Event within 40 seconds, then the confidence level remains 100.

Please help here.

Thanks