Re: [rules-users] EventFactHandle retained in memory after FactCount reaches 0 for temporal-based rule
Correction: The original post did not include another rule that exists in the stream.
The memory leak does not appear unless both rules are active in the stream.
declare MyEvent
@role(event)
@timestamp(timestamp)
end
/* If a RAISE is buffered for N seconds, send it out */
rule "forward raise"
no-loop
duration (3s)
when
$raise : MyEvent(eventState == EventState.RAISE, $raiseId : eventId)
then
System.out.println("Forwarding RAISE(" + $raiseId + ")");
delete($raise);
end
/* When CLEAR, and buffered, clear them both out */
rule "forget it ever happened"
no-loop
when
$clear : MyEvent(eventState == EventState.CLEAR, $clearId : eventId)
$raise : MyEvent(eventState == EventState.RAISE, eventId == $clearId)
then
System.out.println("Forgetting RAISE/CLEAR(" + $clearId + ")");
delete($clear);
delete($raise);
end
On Jul 10, 2014, at 2:50 PM, Kent Anderson <kent.anderson(a)psware.com> wrote:
The following rule produces a memory leak in Drools 6.1.0-SNAPSHOT:
(Stream mode)
declare MyEvent
@role(event)
@timestamp(timestamp)
end
/* If a RAISE is buffered for N seconds, send it out */
rule "forward raise"
no-loop
duration (3s)
when
$raise : MyEvent(eventState == EventState.RAISE, $raiseId : eventId)
then
System.out.println("Forwarding RAISE(" + $raiseId + ")");
delete($raise);
end
I see the rule fire as expected, printing out the message 3 seconds after the event is
added into the session. While the event is waiting, I see a FactCount of 1 in the
session. After the rule fires, the fact count goes to 0. However, using JVisualVm,
querying the heap dump shows 1 instance of MyEvent, referenced by an EventFactHandle and
several other Drools objects.
Is this a bug, or is there a better way to write this rule so Drools’ internals let go of
the object after it is no longer a fact?
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