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

[cyphr]

Thanks again Nicholas!
I did make my own little sample on that, had to check the trunk to get the
newer docs... but 

yes, it appears to help my cause.
One more question - if i have to pick up Drools Rules Language and start
writing Event processing Rules, where would be good place to start ?
considering that i have very little (or no) knowledge of Rule Engines  in
general? I find my self restricted, in the sense i cant express my
requirments with my limited understanding in defining Rules.

thanks again!
Rishi


Nicolas Héron wrote:
> 
> Hello
> You can set any attribute as the time clock
> You have to add an annotation
> It is in the fusion doc
> Sorry for my late answer but I am on holidays :)
> Regards
> Nicolas
> 
> 2009/4/27 cyphr <hrishikesh.varma at wipro.com>
> 
>>
>> Thanks Nicolas,
>> I looked into Drools-fusion over the weekend - interesting!
>> i noticed that the events are wound around the clock in the example
>> provided
>> - is that so always?
>> i would want my correlation to work with the time from timestamp that is
>> already there as part of the fact.
>>
>> Any pointers on where i can get some more reading done on drools-fusion,
>> with some more examples?
>>
>> Thanks again!
>> Rishi
>>
>>
>> Nicolas Héron wrote:
>> >
>> > 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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