[rules-users] Sliding Length Windows

[diana-mendes]

Hello,


I'm having trouble using sliding length windows. Either I'm implementing
them wrong or I have misunderstood how they're supposed to work.


I have a class named Notif:

*public class Notif implements Serializable{
   ...
   private String specificProblem;
   ...
   public String getSpecificProblem() {
        return specificProblem;
   }

   public void setSpecificProblem(String specificProblem) {
        this.specificProblem = specificProblem;
   }
}*


These Notif's represent my events. I want to know how many Notifs with
specificProblem "New ONT" are there in the last 2 received events.

My .drl file looks like this:


*declare Notif
	@role( event )
end

rule "Rule1"
	when
		$event : Notif()
		$nNewONT : Number() from accumulate (
		Notif( specificProblem == "New ONT" ) over window:length(2), count() )
	then
		System.out.println("In the last 2 events there were "+$nNewONT+" events
'New ONT'");
end*


My test file:

*...
		 session.insert(ONTIsInactive1);
		 session.insert(newONT1);
		 session.insert(ONTIsInactive2);
		 session.insert(newONT2);
		 session.insert(LOKS1);
		 session.insert(LOKS2);
		 session.insert(LOKS3);
		 session.insert(newONT3);
		 session.fireAllRules(); *

As you probably can tell by the names, the events I'm looking for are the
2nd, the 4th and the last one.

But the output I get is:


In the last 2 events there were 2 events 'New ONT'
In the last 2 events there were 2 events 'New ONT'
In the last 2 events there were 2 events 'New ONT'
In the last 2 events there were 2 events 'New ONT'
In the last 2 events there were 2 events 'New ONT'
In the last 2 events there were 2 events 'New ONT'
In the last 2 events there were 2 events 'New ONT'
In the last 2 events there were 2 events 'New ONT'


The output I'm looking for is:

In the last 2 events there were 0 events 'New ONT' (because the received
event is "ONTIsInactive")
In the last 2 events there were 1 events 'New ONT' (because the last 2
received events are "ONTIsInactive" and "New ONT")
In the last 2 events there were 1 events 'New ONT' (because the last 2
received events are "New ONT" and "ONTIsInactive")
...
and so on...

What am I doing wrong? Any help would be appreciated!
Thanks in advance,

Diana

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