Optaplanner VRP将客户从工作解决方案中移除

Question

基于来自云平衡问题的这个example，我试图从一个工作解决方案中删除客户，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）有一个变量（previousStandstill），其值为（Customer - 9027426768799526425），它有一个sourceVariableName变量（nextCustomer），其值（null）不是该实体。验证sourceVariableName变量的输入问题的一致性

在那之后，我试图setPreviousStandstill到null：

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

但是，我收到了：

java.lang.IllegalStateException：实体（Customer - 6361368382933429785）有一个变量（previousStandstill），其值为（Customer - 9027434800388369945），它有一个sourceVariableName变量（nextCustomer），其值（null）不是该实体。验证sourceVariableName变量的输入问题的一致性。

请帮忙。

Answer 1

如果您目前有链[Customer1，Customer2，Customer3]，VRP中的客户将被链接/链接

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

并且您尝试从中删除Customer2，您必须修复上一个和下一个元素：

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