过度约束的规划不按预期进行

Question

我一直试图让过度约束的计划来适应我的情况，但不断遇到一些失败的硬约束仍然被分配的问题。如果之前有人回答过这个问题，我很抱歉，但是我看到的大多数示例/解决方案都是围绕Drools展开的，我在这个项目中使用的是streams API。使用optaplanner的quarkus 1.4.2实现，如果有帮助的话。

private Constraint unnassignedPerson(ConstraintFactory constraintFactory) {
    return constraintFactory.from(Assignment.class)
            .filter(assignment -> assignment.getPerson() == null)
            .penalize("Unassigned", HardMediumSoftScore.ONE_MEDIUM);

private Constraint numberAssignmentConflict(ConstraintFactory constraintFactory) {
    return constraintFactory.from(Assignment.class)
            .join(Assignment.class,
                    Joiners.equal(Assignment::getPerson),
                    Joiners.equal(Assignment::getNumber),
                    Joiners.lessThan(Assignment::getId))
            .penalize("Number Conflict", HardMediumSoftScore.of(2, 0, 0));

private Constraint tooLittleSpaceBetweenResourceAssignment(ConstraintFactory constraintFactory) {
    return constraintFactory.from(Assignment.class)
            .join(Assignment.class, Joiners.equal(Assignment::getPerson), Joiners.lessThan(Assignment::getId))
            .filter((assignment, assignment2) -> !assignment.getResourceId().equals(assignment2.getResourceId()))
            .filter(((assignment, assignment2) -> inRange(1, assignment.getNumber(), assignment2.getNumber())))
            .penalize("Not enough space between assignments of different resource (requires 1)", HardMediumSoftScore.of(1, 0, 0));
}

任何关于我可能做错什么的见解都将不胜感激，并提前感谢：）

Answer 1

接下来，我的赋值冲突约束的joiners.lessthan（赋值::getid)部分与可空赋值不兼容。我删除了它，并添加了一些更显式的检查，现在事情就像他们应该做的那样：d

Psuedo-适合任何可能有所帮助的人：

private Constraint numberAssignmentConflict(ConstraintFactory constraintFactory) {
    return constraintFactory.from(Assignment.class)
            .join(Assignment.class,
                    Joiners.equal(Assignment::getPerson),
                    Joiners.equal(Assignment::getNumber))
            .filter(((assignment, assignment2) -> assignment.getPerson() != null && assignment2.getPerson() != null))
            .filter(((assignment, assignment2) -> !assignment.getId().equals(assignment2.getId())))
            .penalize("Number Conflict", HardMediumSoftScore.of(2, 0, 0));
}