VRP with Time Windows - ArrivalTimeListener is not invoked

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Balakrishna Kudikala

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Jun 15, 2022, 8:24:30 PMJun 15
to OptaPlanner development
Hi,

I am trying to impement VRP solution with time windows. I have gone through the examples, quick starts and trying to implement the same. I am using the same domain model explained in  https://docs.optaplanner.org/8.20.0.Final/optaplanner-docs/html_single/index.html#vehicleRoutingDomainModel. However, ArrivalTimeListener is not being invoked during the solving.

Listener Class:
public class ArrivalTimeUpdatingVariableListener implements VariableListener<VehicleRoutingSolution, Customer> {

@Override
public void afterEntityAdded(ScoreDirector<VehicleRoutingSolution> scoreDirector, Customer customer) {
if (customer instanceof TimeWindowedCustomer) {
updateArrivalTime(scoreDirector, (TimeWindowedCustomer) customer);
}
}

@Override
public void afterVariableChanged(ScoreDirector<VehicleRoutingSolution> scoreDirector, Customer customer) {
if (customer instanceof TimeWindowedCustomer) {
updateArrivalTime(scoreDirector, (TimeWindowedCustomer) customer);
}
}
// other blank implementations

TimeWindowedCustomer class:
@PlanningEntity
public class TimeWindowedCustomer extends Customer {
// fields and getters, setters
@CustomShadowVariable(variableListenerClass = ArrivalTimeUpdatingVariableListener.class,
sources = { @PlanningVariableReference(variableName = "previousStandstill") })
public Long getArrivalTime() {
return arrivalTime;
}
}

VRPSolverConfig.xml:
<solutionClass>com.staples.lastmile.planner.domain.VehicleRoutingSolution</solutionClass>
<entityClass>com.staples.lastmile.planner.domain.Standstill</entityClass>
<entityClass>com.staples.lastmile.planner.domain.Customer</entityClass>

Could you please let us know what is wrong in this approach? I could not figure out whats missing.

Thanks
Bala

Geoffrey De Smet

unread,
Jun 17, 2022, 10:12:47 AMJun 17
to optapla...@googlegroups.com

VRPSolverConfig.xml:
<solutionClass>com.staples.lastmile.planner.domain.VehicleRoutingSolution</solutionClass>
<entityClass>com.staples.lastmile.planner.domain.Standstill</entityClass>
<entityClass>com.staples.lastmile.planner.domain.Customer</entityClass>

You need to register TimeWindowedCustomer as an <entityClass> too.

Or use our Quarkus or Spring integration to avoid having to register any.

With kind regards,
Geoffrey De Smet

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