[rules-users] Can Drools be Used for this application?

[Nicolas Héron]

Hello,
have you looked at the cep part of drools ? (drools-fusion)
it is exactly doing what you want with event.
You add an event caracteristic on an existing fact you insert in a statefull
session
and you can have rules using time constraint
regards
Nicolas Heron

2009/4/22 cyphr <hrishikesh.varma at wipro.com>

>
> Hi,
>
> I have a scenario where i have:
>  - A listener that listens to a port and collects datapackets(Logs of
> Events) as they come and dumps to a DB.
>  - consider the data that goes into my table is parsed, processed
> (meaningful, not raw anymore).
>
>
> Can Drools sit in between this listener and my DataBase to achieve the
> following :
>
> 1. Monitor the frequency of occurrence? Say if/when event 'X'  occurs 'n'
> times in a 'z' time window?
> 2. ignore event 'X' until it occurs n times.
> 3. track a sequence of events - event X followed by event y within a fixed
> time window.
>
> (the RHS for any of these is, at the moment, not very consequential. i
> might
> just raise a flag or something to indicate something has happened...)
>
> My query is primarily to understand if this can be achieved.
> i may have around a million logs a day, but - only one event at a time is
> passed from the listener to Drools. Can drools hold the knowledge of
> previous facts(like count) into its working session? or does it require to
> store all these facts also?
>
> Should i be firing the rules whenever each log/event enters my system? or
> should i accumulate the day's facts ? (but i might have rules that need to
> catch conditions spreading over a few days ...)
>
> Some pointers or suggestions on this would be great!
> Thanks!
>
> --
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>
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