[rules-users] Drools Fusion: updating event duration

[Edson Tirelli]

   If your use case somehow has "mutable" events, you can retract, change
the duration and reinsert. 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 <cusmaimatteo at 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.tirelli at 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 <cusmaimatteo at 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 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
>>
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>>
>
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-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com
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