OptaPlanner自定义员工名册-约束提供程序中WeeklyHoursLimit的问题

Question

我一直在遵循员工名册示例来创建自定义员工计划服务。我正在努力实施每周工作时间的限制。然而，我一直未能达到每个员工每周最多工作40小时的要求。我尝试复制OptaPlanner员工名册解决方案。这就是我想出来的，但是无论我尝试什么输入，解决方案都不会返回匹配项。

 Constraint weeklyHoursUpperLimit(ConstraintFactory constraintFactory) {
    return constraintFactory.from(Employee.class)
            .join(Schedule.class, equal(Function.identity(), Schedule::getEmployee))
            .groupBy((employee, schedule) -> employee,
                    ((employee, schedule) -> ZonedDateTime.parse(schedule.getTimeslot().getStart()).toLocalDate()
                            .with(TemporalAdjusters.previousOrSame(DayOfWeek.SUNDAY))),
                    sumDuration((employee, schedule) -> Duration.between(ZonedDateTime.parse(schedule.getTimeslot().getStart()),
                            ZonedDateTime.parse(schedule.getTimeslot().getEnd()))))
            .filter((practitioner, day, time) -> time.toHoursPart() > 40)
            .penalize("Practitioners cannot work more than 40 hours per week", HardMediumSoftScore.ONE_HARD);

{
    "employees": [
        {
            "id": "0458d419-da18-4d86-82de-31a2272f018a"
        }
    ],
    "timeslots": [
        {
            "start": "2021-05-24T00:00:00-04:00",
            "end": "2021-05-24T12:00:00-04:00",
            "slotId": 1
        },
        {
            "start": "2021-05-24T12:00:00-04:00",
            "end": "2021-05-25T00:00:00-04:00",
            "slotId": 7
        },
        {
            "start": "2021-05-25T12:00:00-04:00",
            "end": "2021-05-26T00:00:00-04:00",
            "slotId": 4
        },
        {
            "start": "2021-05-27T12:00:00-04:00",
            "end": "2021-05-28T00:00:00-04:00",
            "slotId": 5
        }
    ]
}

使用此输入，唯一可能的解决方案必须匹配此约束。其他约束会被检测和惩罚，所以我想知道为什么这一个永远不会返回任何匹配。

Answer 1

我怀疑问题出在过滤器上:.filter((pricitioner,day,time)->time.toHoursPart()>40)

Duration#toHoursPart（）返回一天中总小时数除以小时数后的余数，该余数介于0和23之间。过滤器可能应该使用duration#tohours（）。