[rules-users] Insert fact to be used as semaphore

[webfrank]

Hi everybody, I'm new to drools and I would like to solve this simple
situation:

I have a rule which will fire when 3 or more events comes from entry-point
with level > 4 in a 10s window:
rule "Got 3 events"
when
	not Alarm()
	t : Number(intValue > 2) from accumulate (
		e : Event( level > 4) over window:time(10s) from entry-point "queue",
		count(e)
	)
then
	insert(new Alarm());
end

This way if more events comes with level > 4 no more alarms are sent.

I have another rule to retract Alarm object when more than 5 events comes
with level < 6 in a 10s window:

rule "Reset alarm"
when
	a : Alarm()
	c : Number( intValue > 5) from accumulate (
		e : Event( level < 6) over window:time(10s) from entry-point "queue",
		count(e)
	)
then
	 retract(a);
end

The problem is that I got an infinite loop once I retract the Alarm object
and a new is inserted by the first rule.

How could I solve the problem? Probably a different approach but I'm still
learning.



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