[rules-users] Getting started with Drools Fusion

[Edson Tirelli]

   Keep us posted... :)

   Although they are not 1-to-1 mapping, so you will find that you will have
to make compromises when choosing the strengths versus the weaknesses of
each of them.

   Edson

2010/5/7 Tina Vießmann <tviessmann at stud.hs-bremen.de>

> Thank you, Edsons. You've answered my questions saitsfying. :)
>
> I will read the Drools Expert UG - I've added it to my ToDo-list some days
> ago. Lets see how DF+DE will in the end beat IEP and Esper. :)
>
> Tina
>
>
> >    Hi Tina,
> >
> >    I might look daunting at first, but I hope once you start using it,
> you
> > will realize how powerful the concept of enabling CEP for rules and
> > processes is and how simple that becomes in Drools as compared to
> > integrating heterogeneous products for the same task.
> >
> >    I recommend you read the Drools Expert documentation as well, as
> Fusion
> > features are additions to the overall Expert features and syntax.
> >
> >    Regarding your questions: drools does not handles persistence by
> > itself.
> > It delegates to the application to decide what to do with them. You can
> of
> > course persist individual events in a database or disk, or you can
> persist
> > drools session snapshots if that fits better your application model.
> >
> >    Sliding windows are always based on the current time or latest event,
> > but
> > Drools offers the complete set of 13 temporal operators and their
> > negations.
> > So you can reason over times A and B. For instance, you want to check
> that
> > event Eb happened between 10s and 30s after Ea. You can write that as:
> >
> > $ea : EventA()
> > $eb : EventB( this after[10s,30s] $ea )
> >
> >    So that creates a arbitrary "windows of interest" that are not based
> on
> > the current time, but otherwise anchored on each EventA that is received
> > by
> > the engine.
> >
> >    Hope it helps,
> >
> >    Edson
> >
> > 2010/5/7 Tina Vießmann <tviessmann at stud.hs-bremen.de>
> >
> >> Hello everybody :)
> >>
> >> I'm completely new to the Drools universe. I've discovered Drools, or
> >> more
> >> specifically Drools Fusion, by looking for a powerful CEP engine.
> >> I've read the DF user guide and came up with some issues about DF
> >> features.
> >> It would be great, if anyone can give me some explanations and/or refer
> >> to
> >> different information sources.
> >>
> >> My questions:
> >>
> >> 1. Persistence of events:
> >> I know that DF can store events explicitly and implicitly. But does it
> >> store events in persistent (e.g., I can continue my computation after a
> >> reboot)? If it does, how are the events stored?
> >>
> >> 2. Sliding windows:
> >> It's written that a window contains the last X events/the event occurred
> >> in the last X time units. Is it somehow possible to specify a window for
> >> process only old events - which does not catch up to the latest event?
> >> (Lets assume we have the times A, B and C with: A < B < C  and  C ==
> >> current time. Is it possible to specify a window that process events
> >> occurred between A and B?)
> >> So are more complex windows like described in chapter 7 of the book
> >> 'Event
> >> Processing in Action' (see http://www.manning.com/etzion/) possible?
> >>
> >>
> >> Are there any (step-to-step) tutorials / how-tos about simple DF
> >> programs?
> >>
> >>
> >> In case my questions are stupid because they can be answered when
> >> knowing
> >> Drools, but I've got absolute now experience using Drools. At the moment
> >> I
> >> kind of have the feeling, Drools is a little bit too complex for just
> >> using to implement CEP applications...
> >>
> >>
> >> Thanks for any help! :)
> >>
> >> Tina
> >>
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >
> >
> >
> > --
> >  Edson Tirelli
> >  JBoss Drools Core Development
> >  JBoss by Red Hat @ www.jboss.com
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
>
>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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