[rules-users] Problem with simple Fusion test case

[Wolfgang Laun]

There is a fundamental misunderstanding on your side.

An event's timestamp and duration are used for reasoning, relating
events by means of temporal operators, e.g., A before B, A meets B,
and so on.

Your condition
   Event()
is just a test for a fact of type Event() being in WM, and it doesn't
care for its timestamp and duration.

For relating (real or psudo) with your events' times, look at
window:time, timer() and the aforementioned temporal ops.

Cheers
Wolfgang


On 16/04/2012, RobinMacharg <robin.macharg at gmail.com> wrote:
> 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
>
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Problem-with-simple-Fusion-test-case-tp3914358p3914358.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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