[rules-users] Problem with simple Fusion test case

[RobinMacharg]

Hi,

I'm new to Drools (this is my first post) and am running into problems
understanding the temporal aspects of it.

I am trying to create a simple test case, using the pseudo-clock to control
time.  I declare and add a number of events with different start times
(@timestamp) and durations (@duration).  I'd then like to advance the
pseudo-clock by hand, calling fireAllRules() between clock-ticks.  I have a
single rule that I would hope would fire on events that are 'valid', i.e.
their (start_time < clock) and their  (start_time + duration > clock).  I'm
seeing ALL events being picked up the first time I fireAllRules().  I'd
really appreciate an explanation of what I'm missing here.

Some code:

I have a POJO Event class:

public class Event {
	public String name;
	public long start;
	public long dur;
//... constructor, getters, setters omitted for brevity
}

I have a .drl file with an event declaration and a single rule in it:

package myPackage.Event
import myPackage.Event
declare Event
    @role( event )
    @timestamp ( start )
    @duration ( dur )
end

rule "events"
when
	e : Event()
then
	System.out.println(e.name);
end

My scaffolding creates a STREAM based, pseudo-clock configured stateful
KnowledgeSession, and reads the .drl rules using the standard code from the
examples. I create a number of Events:

Event e1 = new Event("myEvent1", 0, 1000);
Event e2 = new Event("myEvent1", 10000, 20000);

ksession.insert(e1)
... etc.

Then I fireAllRules(), advance the clock and fire them again.  I'm seeing
the second event being matched on the first fireAllRules().  I'd not have
expected it to fire until the clock > 10000.  I'm sure Drools is doing the
right thing, and I'm not, but I can't work out what.  The examples of the
temporal operators all refer to a second event to be compared to.  Also, I
can't find an example of referencing the drools system clock value (in this
case the pseudo-clock) from within a rule match section.

So, what am I doing wrong?  If I can make my example clearer please let me
know.

Thanks in advance,
Robin


 

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