Mark Proctor wrote:
Carlsen, Len wrote:
Other issues are the performance of the Drools Solver and having
thousands of rules compiled, loaded and running. During registration
we could have thousands of rules executing concurrently. The rules
engine and the BRMS would be services as part of an SOA infrastructure
(and an OSGi service environment). Anyone got any experience with
Drools in an OSGi environment with respect to class loading issues
when compiling rules and facts from other bundles since rules and
facts may be in different bundles? Bundle buddy class loading?
No but it is something that interests us, please give us your OSGi
feedback. Solver is not currently a supported product, its very much R&D
alphaware, but I'm sure geoffrey would love your feedback, good to see
people are evaluating it.
yes, feedback on solver is very welcome :)
The good news is, I am now working on an example called Examination,
which is an implementation for the itc2007 examination competition:
http://www.cs.qub.ac.uk/itc2007/examtrack/exam_track_index_files/examevaluation.htm
It's based on real-world data. The "starter" dataset contains 7883
students, 607 exams, 54 periods and 7 rooms. There are 5 hard
constraints and 7 soft constraints:
http://www.cs.qub.ac.uk/itc2007/examtrack/exam_track_index_files/examevaluation.htm
The bad news is, it's not performing yet, because I need to make a
scalable selector implementation, which I am working on.
There's an example called lesson schedule (which schedules courses), but
that's just a toy example to learn drools-solver, at it just has 2 hard
constraints.
One piece of advice though: separate the solver part from the rest. Once
the solver starts calculating, you 'll only want to have score-related
rules in the rulebase. The solver can easily do a million fireAllRules
per minute, so every performance loss is blown up.
With kind regards,
Geoffrey De Smet
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