为员工调度添加班次间最小间隔时长约束参数遇问题

• 核心问题：你的代码里用join(ConstraintParameters.class)关联全局参数是错误的。ConstraintParameters是全局单例配置，不需要和Shift做笛卡尔积关联，应该用from(ConstraintParameters.class)来获取这个单例对象。

• 修正后的代码：

Constraint atLeast10HoursBetweenTwoShifts(ConstraintFactory constraintFactory) {
    return constraintFactory.forEach(Shift.class)
            .join(Shift.class, equal(Shift::getEmployee), lessThanOrEqual(Shift::getEnd, Shift::getStart))
            .from(ConstraintParameters.class) // 替换join为from
            .filter((firstShift, secondShift, constraintParameters) -> 
                Duration.between(firstShift.getEnd(), secondShift.getStart()).toHours() < constraintParameters.minRestHours()
            )
            .penalize(HardSoftBigDecimalScore.ONE_HARD,
                    (firstShift, secondShift, constraintParameters) -> {
                        int breakLength = (int) Duration.between(firstShift.getEnd(), secondShift.getStart()).toMinutes();
                        return (constraintParameters.minRestHours() * 60) - breakLength;
                    })
            .asConstraint("At least X hours between 2 shifts");
}

• 额外检查点：
  • 确保ConstraintParameters类添加了@ConstraintParameters注解：

    @ConstraintParameters
    public class ConstraintParameters {
        private int minRestHours;
        // 对应的getter、setter或构造方法
    }
    

  • 确保Solver配置中正确加载参数，比如通过代码设置：

    ConstraintParameters params = new ConstraintParameters();
    params.setMinRestHours(10);
    solverFactory.getSolverConfig().setConstraintParameters(params);
    

内容的提问来源于stack exchange，提问作者Urezo