Re: [rules-users] Time Sliding Window Question
Hello Wolfgang,
thanks for the answer.
Does that mean the description on page 32 of the Drools Fusion User Guide is
not correct?
"...
2.6.1. Sliding Time Windows
Sliding Time Windows allow the user to write rules that will only match
events occurring in the
last X time units.
For instance, if the user wants to consider only the Stock Ticks that
happened in the last 2 minutes,
the pattern would look like this:
StockTick() over window:time( 2m )
Drools uses the "over" keyword to associate windows to patterns.
..."
Do you know a way for my simulation to get only the latest events in between
10 minutes?
Do I need an additional constraint for the rule?
Thanks,
Bernhard
-----Ursprüngliche Nachricht-----
Von: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] Im Auftrag von Wolfgang Laun
Gesendet: Montag, 28. Mai 2012 15:11
An: Rules Users List
Betreff: Re: [rules-users] Time Sliding Window Question
Whenever you insert an event, a simple rule like
ruel x when Event() over window:time(x) then...end
immediately results in an activation. Your for loop merely postpones
firings.
A selection of an event due to a window:time() is different from a
selection due to a constraint. The latter may result in cancelling the
activation if the fact is modified accordingly. But there's no
reevaluation due to the passage of time.
-W
On 28/05/2012, Bernhard Unger <mail(a)bernhardunger.de> wrote:
Hello,
I am fairly new to Drools and tried my first steps with Drools Fusion and
was running into the following problem:
According to the Drools Fusion User Guide Version 5.4.0.Final on page 32
the
following pattern should work and select events in between the last 10
minutes:
...
StockTick() over window:time( 2m )
...
I tried the following example, simulating RHQ EventComposite Events with a
simple Junit test:
...
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(new ClassPathResource("rhqrules.drl", getClass()),
ResourceType.DRL);
KnowledgeBaseConfiguration config =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
config.setOption(EventProcessingOption.STREAM);
nowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(config);
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
KnowledgeSessionConfiguration conf =
KnowledgeBaseFactory.newKnowledgeSessionConfiguration();
conf.setOption(ClockTypeOption.get("pseudo"));
ksession = kbase.newStatefulKnowledgeSession(conf, null);
...
inside the test method:
...
For-Loop inserts new Events and increases the pseudo clock in one minute
steps:
...
for (int i = 0; i < 100; i++) {
timestamp = clock.advanceTime(1, TimeUnit.MINUTES);
ksession.insert(new EventComposite("EventDetail" + i, resourceId,
"resourceName" + i, "resourceAncestry" + i, resourceTypeId,
eventId, severity, "sourceLocation" + i, timestamp));
}
...
ksession.fireAllRules();
...
The .drl definition should fire only events of the last 10 minutes,
however
all inserted 100 events are fired:
declare EventComposite
@role( event )
end
rule "Rule1 events in between last 10 minutes"
when
$event : EventComposite() over window:time( 10m )
then
System.out.println("Event in between the last 10 minutes:: " +
$event);
end
On the other hand this rule works as expected and selects only events
older
than 10 minutes:
rule "Rule2 events not in between the last 10 minutes"
when
$eventA : EventComposite( )
not EventComposite( this.resourceId == $eventA.resourceId ) over
window:time( 10m )
then
System.out.println("Event not in between the last 10 minutes: " +
$eventA);
end
My question is:
What did I wrong in the definition of Rule-1, what is the correct
statement
for finding the last 10 minutes events?
Background information:
I am doing some research on implementing using the drools framework inside
the RHQ framework for complex event processing. I would like to show that
this is possible and could be uses reasonable for RHQ event processing.
Any help is highly appreceated!
Thanks and kind regards
Bernhard
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