[rules-users] Trying to get Sliding Windows to work

[ober0n]

Hi Ed, no need to apologize, you have been invaluable in my first steps
towards Drooling :-D so thanks for all your help, it is GREATLY appreciated
:clap:.

We have a few scenarios in mind but aren't really implementing them yet,
just trying to see if sliding windows works the way we think it does. In the
simple rule I wrote above, I basically want to check if two facts are
temporally close.

Yes, you are correct. I didn't pay enough attention to the manual and didn't
use STREAM mode to enter in my facts. I will use the manual insertion
process found in "Example 2.10. Inserting facts into an entry point" of
section "2.3. Streams Support" to update my code. And, I will update my rule
to specify a "from entry-point <Specific Stream>".

Also, could you comment on the simple rule I am using? Does it look like it
should work after I do the updates? Or is my logic incorrect?

Thanks again.



   Ober0n,

   Sorry for the delay on answering. I am on a trip with limited internet
connection.
   I am interested in your experience with the sliding windows, since the
tests are working. Maybe it is a scenario not covered by the tests.

   In any case, what is probably happening is that you are not configuring
the engine to work in STREAM mode. The default mode is CLOUD and it does not
support sliding windows. It seems the engine is silently failing in this
case, when the compiler raise an error to warn the user.

    I just committed some docs on this subject:

https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/docs/drools-fusion/html/ch02.html#d0e1067

    (plz, wait for hudson to rebuild the docs or build docs yourself).

    Feedback welcome. I will complement the sliding window docs.

    []s
    Edson

2009/3/29 ober0n <lili339 at hotmail.com>

>
> Still trying to get sliding windows to work (basing my code off of the
> Eclipse supplied "Hello World" example). I don't think I fully understand
> how it works yet so I'm trying to simplify things even further by writing
> a
> simple rule that is meant to say:
>
> if (current_message = "Hello" AND exists( goodbye_message within
> sliding_window(3 seconds) ))
> then print("There was a GOODBYE message before the HELLO message." )
>
> In other words: This rule should fire if the current Hello World message
> was
> preceeded within 3 seconds by a goodbye message.
>
>
> ---------------------------------------------------------------------------------------------------
> I wrote a new rule for this:
>
> declare Message
>    @role( event )
> end
>
> rule "Goodbye before Hello World"
>        when
>                Message( status == Message.HELLO )
>                exists( Message( status == Message.GOODBYE ) over
> window:time( 3s ) )
>        then
>                System.out.println( "There was a GOODBYE message before the
> HELLO
> message." );
> end
>
>
> ---------------------------------------------------------------------------------------------------
>
> To send the messages: (ksession is a StatefulKnowledgeSession)
>
>                        ...
>                        ksession.insert(goodbye_message);
>                        ksession.fireAllRules();
>
>                        Thread.sleep(5000);
>
>                        ksession.insert(hello_message);
>                        ksession.fireAllRules();
>                        ...
>
> ---------------------------------------------------------------------------------------------------
>
> I expect to get nothing back since I sent the Hello message 5 seconds
> after
> the goodbye message (outside the sliding window of 3 seconds). But, for
> some
> reason the rule fires and I get one:
>
> "There was a GOODBYE message before the HELLO message."
>
> Any help would be greatly appreciated.
>
> Thanks!
> --
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> Sent from the drools - user mailing list archive at Nabble.com.
>
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> rules-users mailing list
> rules-users at lists.jboss.org
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>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com

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