optaplanner

来源： https://stackoverflow.com/questions/63712863/how-can-we-use-multiple-constraintproviders-when-using-the-springboot-optaplann

来源： https://stackoverflow.com/questions/63712863/how-can-we-use-multiple-constraintproviders-when-using-the-springboot-optaplann

来源： https://stackoverflow.com/questions/63715928/can-we-use-multiple-planningsolution-classes-and-multiple-solvermanager-in-spri

来源： https://stackoverflow.com/questions/63715928/can-we-use-multiple-planningsolution-classes-and-multiple-solvermanager-in-spri

来源： https://stackoverflow.com/questions/63715928/can-we-use-multiple-planningsolution-classes-and-multiple-solvermanager-in-spri

问题 I have a student, who have list of courses. Also I have a lectures and I need to check that student courses list and list of courses of lectures that he visits are same I added rule for case, when student visits lecture, that he doesn't have in courses list: when $student:Student ($courses:courses) LectureAssignment(student == $student, course not memberOf $courses) then scoreHolder.addHardConstraintMatch(kcontext, -1); But I also need to check, that student visits all lecture, that he have

问题 Recently I added OptaPlanner dependency to my build.gradle in order to use the Vehicle Routing Problem of the Library. When I tried to use the solver I received the following error java.lang.NoSuchMethodError: No static method metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; in class Ljava/lang/invoke/LambdaMetafactory; or its

问题 Our current approach is running solver many times. I am wondering if there is a better approach. Some explanation: Vehicle Routing Problem with Multiple Trips (VRPMT): The vehicles can do more than one route. 回答1: Take the VRP example, rename Vehicle to VehiclePerDay , then introduce 2 fields on it: the vehicle and the LocalDate. This is presuming one trip per day. If you do multiple trips on the same day, there are 2 approaches: 1) Split Vehicle into VehicleTrip as above and have them point

问题 i'm working with the Multiple Vehicles Route Problem. I'm trying Optaplanner and looks good and promising. I'm using the CVRP-32customers example, but I need to remove the "depots". I just need to optimize a route for some salesman, where they start is not an issue to me. I just need the best 10 routes to visit my 100 customers, does not matter where they start. I looked at this SO Question, but could not take anything from it to solve my problem. Can this be achieved with Optaplanner? Is

问题 I have a long running solver that I wish to periodically update with new planning entities (incoming orders). Below is the sequence in the ProblemFactChange that I have pieced together. Is this the correct sequence? I could not find an example for this. solution = scoreDirector.getWorkingSolution(); scoreDirector.beforeEntityAdded(order); solution.getOrderList().add(order); scoreDirector.triggerVariableListeners(); scoreDirector.afterEntityAdded(order); 回答1: Yes, see also the new task