how to dynamically add / remove constraints in optaplanner

Question

We are using optaplanner for VRP. One challenge we have is many of our constraints are specific to a local area. For example, in one state Technician can't cross state line where as in other states technicians can cross state line.

Under such scenario we want create a generic solution where user can add hard constraints and generic solution pick that constraint from data base to provide solution.

Has anyone designed such a solution?

Thanks

Answer 1

Either use different <scoreDrl> elements:

• general.drl
• ny-specific.drl
• ca-specific.drl
• tx-specific.drl
• ...

Or if you need to solve a single dataset that contains both tx and ny employees, then do something like

class Employee {
    State state;
}

rule noCross
when
    Employee(state = "Texas") // doesn't apply to California
    // ... crosses lines
then
    ...
end