Re: [rules-users] [Drools Planner] Multi depot CVRP / CVRPTW
Op 19-11-12 19:33, Mats Norén schreef:
Interesting. You mean that I could add another rule in the vrp
example
that checks the vehicle TimeWindow of the customer against
CustomerVisitArrivalTime?
In that case is the CustomerVisitArrivalTime a planning variable and
in which domain class does it belong?
I'm still trying to wrap my head around the concepts. :-)
It's not another
planning variable,
instead,
do something like
when
...
then
insertLogical(new CustomerVisitArrivalTime(...));
end
when
CustomerVisitArrivalTime($c : customer, $a : arrival)
not CustomerTimeWindow(customer == $c, $a > start, $a < end)
then
insertLogical(new IntConstraintOccurrence(...))
end
See nurseRosteringScoreRules.drl for an example of use of
insertLogical's like that
/M
On Mon, Nov 19, 2012 at 5:39 PM, Geoffrey De Smet
<ge0ffrey.spam(a)gmail.com> wrote:
> Op 19-11-12 17:17, Mats Norén schreef:
>
> Hi,
> I've been looking at the VRP example in Drools and I'm thinking about using
> it for multi depot cvrp and / or capacitated vrp with time windows.
> Has anyone else tried planner for these use cases and can maybe shed some
> light on their implementation?
>
> The VRP example is already capacitated.
>
> Multi-depot is pretty easy: just assign different a different starting
> Location for every Vehicle.
> Unless you want Vehicles to change Depot sometimes, then it's a bit more
> complex.
>
> Time windows is more difficult if you don't want to break incremental score
> calculation.
> Doing an insertLogical() for the arrival time of every CustomerVisit should
> work.
> Then it's just a matter of checking if that logically inserted fact
> CustomerVisitArrivalTime falls within the TimeWindow of the customer.
>
>
> Regards,
> Mats
>
>
>
>
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