Hi Wolfgang, thanks a lot for the explanation, but i am very sad now. I have to use STREAM mode, because i am implementing a spatio-temporal expert system, so, i need of temporal reasoning. I need to compare events on time too. >From my understaning, i am limitated by:
- i cannot update timestamp and duration of an event; - i cannot insert a new event with an old timestamp is it right? In a realtime sensor system, i don't receive the event with duration, but i need to correlate them to have an event with duration. Do you have any suggestions? Thanks a lot, Matteo. On Thu, Feb 23, 2012 at 7:39 AM, Wolfgang Laun <wolfgang.l...@gmail.com>wrote: > On 22/02/2012, Edson Tirelli <ed.tire...@gmail.com> wrote: > > If your use case somehow has "mutable" events, you can retract, change > > the duration and reinsert. > > But mind the requirements of STREAM mode: Events in each stream must > be time-ordered. I.e., inside a given stream, events that happened > first must be inserted first into the engine. If reinsertions would > violate this, you must run the session in CLOUD mode, which has > certain consequences. This is all very well described in the Fusion > manual, section on "Event Processing Modes". > > -W > > > > The engine uses optimizations for the temporal > > reasoning that are based on the fact that events should be immutable. > That > > is why the engine "resolves" the timestamp/duration attributes at insert > > time and make them immutable. > > > > Edson > > > > 2012/2/22 Matteo Cusmai <cusmaimat...@gmail.com> > > > >> Hi Edson, > >> so, when i want modify an event, i could do as follow: > >> > >> - clone event; > >> - change the duration > >> - retract the previuos event > >> - insert the new event > >> > >> Is it right? > >> > >> Bye bye, > >> > >> Matteo. > >> > >> 2012/2/22 Edson Tirelli <ed.tire...@gmail.com> > >> > >>> > >>> Unfortunately you can't update event durations or timestamp. Events > >>> are supposed to represent things that happened and as so, are immutable > >>> (other than data enrichment). If an event representation is no longer > >>> true, > >>> that event has to be retracted. Most common case is when you are > dealing > >>> with atomic events (like start and end atomic events) that represent a > >>> complex event. Usually you will have a rule that correlates the start > and > >>> end atomic events and creates a complex derived event, retracting the > >>> atomic ones. > >>> > >>> Edson > >>> > >>> 2012/2/22 Matteo Cusmai <cusmaimat...@gmail.com> > >>> > >>>> > >>>> Hi all, > >>>> i am using Drools Fusion in multi sensor data fusion system. I have > some > >>>> rules that generate a new event when some situations occur. But from > the > >>>> other hand, i would like to update the event, when i understand that > new > >>>> sensor observation is referring to the same event. I have my Event > clazz > >>>> with duration field, i try to update it in modify clause, but i have > >>>> concern about it, because when i use temporal operator (such as > before, > >>>> meets, so on) it seems that Drools manage them as event with duration > >>>> null. > >>>> I could post the code too. > >>>> Bye bye, > >>>> Matteo. > >>>> _______________________________________________ > >>>> rules-users mailing list > >>>> rules-users@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@lists.jboss.org > >>> https://lists.jboss.org/mailman/listinfo/rules-users > >>> > >>> > >> > >> _______________________________________________ > >> rules-users mailing list > >> rules-users@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@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users >
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