[rules-users] Persistence and event expiry

[Wolfgang Laun]

There is no telling whether this works "as intended" because there is
no documentation (I know of) that would describe the intentions of
automatic expiry.

(My thoughts on the matter: But a session started in STREAM mode
begins with something I like to compare to the Big Bang, and there is
no Time before that. So:
what should a system do with an event that's timestamped with an
impossible time? Restarting a real-time session with a *state* is all
right, but events have disappeared below the horizon.)

I'd not bank on automated expiry and take things into my own coding hands.

-W



On 27/08/2013, DanielStahl <daniel.stahl at ericsson.com> wrote:
> Hi,
>
> I'm quite new to Drools, and very excited about the possibilities it offers,
> but I need a bit of advice. I'm using Drools 6.0.0.CR1 to run a Stream
> session in my application.
>
> The application will be running for extended periods of time, so I need to
> be able to delete facts over time. I can solve that nicely by declaring them
> as events and letting them expire either implicitly or explicitly.
>
> I also need the session to be persistent, so that if the application
> restarts it resumes from any previously saved state. I can do that by
> creating my own ObjectMarshallingStrategy and adding an EventListener,
> marshalling upon insert/update/deletion of facts, and then unmarshalling
> upon startup. That works.
>
> My problem is that unmarshalled events never expire. To exemplify: Event A
> will expire after 30s. Before that happens, though, the application restarts
> and unmarshals the session. Event A is now still in the fact base of the
> restarted session, but it will never expire. Since I'm new to Drools, I'm
> assuming I'm doing something wrong, but I'm not sure what. So my question
> is: is my setup reasonable, or is there a better way to achieve this? Is
> this working as intended, or a bug? If working as intended, is there a
> workaround?
>
> Best regards,
> Daniel Ståhl
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Persistence-and-event-expiry-tp4025697.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
>
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