[rules-users] A basic doubt about Drools Fusion

[Adrián Paredes]

Hi all:

I have a very basic doubt about Drools Fusion.

I have two simple Java classes:

EventA  {
    String id;
    Date timestamp;
    Long duration;
}

EventB {
    String id;
    Date timestamp;
    Long duration;
}

I have a DRL file, where I declare this two classes as Events:

declare EventA
    @role(event)
    @timestamp(timestamp)
    @duration(duration)
end

declare EventB
    @role(event)
    @timestamp(timestamp)
    @duration(duration)
end

I have a simple rule:

rule "Basic Rule"
dialect 'mvel'
when
    $eventA: EventA($aId: id) from entry-point "time stream"
then
    System.out.println("Event A " + $aId + " at " + $eventA.timestamp);
end

Finally, I have a test that starts a StatefulKnowledgeSession in STREAM
mode, register an eventLister in the session in order to fire the rules
when an event arrives:

ksession.addEventListener(new DefaultAgendaEventListener() {
    @Override
    public void activationCreated(ActivationCreatedEvent event) {
        ((StatefulKnowledgeSession)
event.getKnowledgeRuntime()).fireAllRules();
    }
});

And then the test insert in the "time stream" entry-point an instance of
EventA with duration of 10 miliseconds, as follows:

EventA eventA = new EventA();
eventA.setId("123");
eventA.setTimestamp(new Date());
eventA.setDuration(10L);
ksession.getWorkingMemoryEntryPoint("time stream").insert(event);

At the end of the test, I have an sleep of 2 seconds just in case.

I don't understand why the "Basic Rule" never fires.

But if I add another condition to the same rule, something like this:

rule "Basic Rule"
dialect 'mvel'
when
    $eventA: EventA($aId: id) from entry-point "time stream"
    not EventB($aId == id, this after [0s,5s] $eventA) from entry-point
"time stream"
then
    System.out.println("Event A " + $aId + " at " + $eventA.timestamp);
end

The rules fires and I see this message in console:

Event A 123 at Fri Dec 07 09:48:59 ART 2012

I don't understand why the first rule, that is more open, don't fire, and
the second rule, that is more restrictive, fires without problems.

Thank you very much!

Greetings,
Adrian.

-- 
*Epidata Consulting | Deploying Ideas
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