A sliding window requires the use of STREAM mode, and you must use a
session clock, pseudo or real-time.

I'm also a worried about "size==80"; shouldn't you use "size >= 80"?
But this depends on the way you run the session; are you doing this
with fireUntilHalt in a separate thread?

It shouldn't be a problem if the session is run with a real-time clock and
delayed events (with the timestamp in the data, as you apparently have)
arrive and are inserted. Docs say that that this is OK, as long as events
are inserted in each entry-point in chronological order. If there are
different streams, each with individual delays, you may have to use
multiple entry-points.


On 1 December 2010 16:10, Anais Martinez <amartinez@iti.upv.es> wrote:

Hello. I have two questions about collect and sliding windows. I have created
this rule:

rule "Active risk"
when
 $n:Node()
 $readings: ArrayList(size==80)  from collect(
  Reading( nodeID == $n.nodeID,
   (signalType == SignalType.PLUVIOSITY && value >= 10)||
   (signalType == SignalType.AIR_TEMPERATURE && value>=12)
  ) over window:time(10h))
then
 System.out.println("Active risk in node "+ $n.getNodeID());
end

And the declarations are the following (Reading and Node are java classes):

declare Reading
       @role(event)
       @timestamp (timestamp)
end

declare Node
       @role(fact)
end


Well, I have probe the rule. I have inserted 100 readings which satisfy the
conditions, in a single time but with different timestamp (I have simulated
that there are a pluviosity reading and a air_temperature reading each 15
minutes), that is, in main:

long init= 1290729600000L;
long interval = 1000*60*15;
for (int i=0; i<100; i++){
       long fecha = init+i*interval;
       Reading r1 = new Reading(SignalType.PLUVIOSITY, value1, node);
       session.insert(r1);

       Reading r2 = new Reading(SignalType.AIR_TEMPERATURE, value1, node);
       session.insert(r2);
}

The message is not written (I have fired rules after insertions).

My questions:
Has drools any problem if I inserted all readings at same time? (Do I have
to use the pseudo-clock?)
My problem is that the readings will be sent from a server in real system,
and it's possible that the server will send all readings belonging to an
interval of one/two hour/s at same time.

Thanks.

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