[rules-users] Persistence and event expiry

[DanielStahl]

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



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