Optaplanner VRP从工作解决方案中删除客户

Question

基于这个来自云平衡问题的示例，我尝试将客户从工作解决方案中删除，如下所示：

Location toBeRemovedLocation = customerToBeRemoved.getLocation();
Location lookUpWorkingObject = (Location) scoreDirector.lookUpWorkingObject(toBeRemovedLocation);
scoreDirector.beforeProblemFactRemoved(lookUpWorkingObject);
routingSolution.getLocationList().remove(lookUpWorkingObject);
scoreDirector.afterProblemFactRemoved(lookUpWorkingObject);

Customer workingCustomer=(Customer) scoreDirector.lookUpWorkingObject(customerToBeRemoved);

for (Customer customer : routingSolution.getCustomerList()) {
    nextCustomer=customer.getNextCustomer();
    if (nextCustomer==workingCustomer) {
        scoreDirector.beforeVariableChanged(customer, "nextCustomer");
        customer.setNextCustomer(null);
        scoreDirector.afterVariableChanged(customer, "nextCustomer");
    }
}

scoreDirector.beforeEntityRemoved(workingCustomer);
routingSolution.getCustomerList().remove(workingCustomer);
scoreDirector.afterEntityRemoved(workingCustomer);
scoreDirector.triggerVariableListeners();

结果我得到了这个例外：

java.lang.IllegalStateException：实体（Customer--6361356485874019865）有一个值为（Customer--902742678799526425）的变量（previousStandstill），该变量有一个值为（null）的sourceVariableName变量（nextCustomer），该值不是该实体。验证该sourceVariableName变量的输入问题的一致性

在那之后，我也尝试了setPrevious标准化到null：

scoreDirector.beforeVariableChanged(customer, "previousStandstill");
customer.setPreviousStandstill(null);
scoreDirector.afterVariableChanged(customer, "previousStandstill");

但是，我收到：

java.lang.IllegalStateException：实体（客户--6361368382933429785)有一个带值的变量（前一个静态变量）（客户--9027434800388369945)它有一个带值（空）的源变量（下一个客户），它不是该实体。验证该源变量的输入问题的一致性。

需要帮忙吗，拜托。

Answer 1

如果您当前有链[Customer1，Customer2，Customer3]，VRP中的客户是链接/链接的

- Customer1: nextCustomer = Customer2
- Customer2: nextCustomer = Customer2, prevStandstill = Customer1
- Customer3: prevStandstill = Customer2

如果要从中删除Customer2，则必须修复之前和接下来的元素：

- Customer1: nextCustomer = Customer3
- Customer2: nextCustomer = null, prevStandstill = null
- Customer3: prevStandStill = Customer1