在规则中使用 CountableValueRange

Question

我目前正在为共享一些资源的任务构建一个调度应用程序。每个任务可能使用一定百分比的资源。

我需要在 Drools 规则中检查的是并行任务对每个共享资源的使用率不超过 100%。

所以代码看起来像：

@Data

public class Resource {

   @PlanningId

   private Integer id;

   private String label;

}

public class ResourceUsage {

   @PlanningId

   private Integer id;

   private Resource resource;

   private int usagePercent;

}

要安排的实体

@Data

@PlanningEntity

public class TaskAssignment {

   @PlanningId

   private Integer id;

   @PlanningVariable(valueRangeProviderRefs = { "slotRange" })

   private Integer timeSlot;

   private int duration;

   private ResourceUsage resourceUsage;

   public Integer getEndingSlot() {

        return timeSlot + duration;

   }

}

最后是解决方案

@Data

@PlanningSolution

public class PlanningSolution {

  @PlanningId

  private Integer id;

  @PlanningEntityCollectionProperty

  private List<TaskAssignment> tasks = new ArrayList<>();

  @ValueRangeProvider(id = "slotRange")

  public CountableValueRange<Integer> getSlotRange() {

        return ValueRangeFactory.createIntValueRange(0, 10_000);

  }

  @ProblemFactCollectionProperty

  private Set<Resource> resources = new TreeSet<>();

}

Setter 和 getter 不存在，因为我使用 Lombok 来避免编写它们。

过去，我使用一个类来表示时隙，编写一个规则来迭代时隙集合很容易，我能够按时隙检查每个资源的全局使用情况，并在使用率大于 100% 时进行惩罚。

由于我在内存使用方面遇到问题，我决定将 TimeSlot 类转换为 CountableValueRange ，但现在，我不知道如何创建与该范围的每个值相匹配的规则。执行与之前相同的计算。

有什么办法或者我必须切换回我的 TimeSlot 课程吗？

编辑：包含在一种影子规划实体中的影子变量可以解决这个问题吗？

Answer 1

我终于找到了一种编写规则的方法，该规则允许我避免在时间段上进行迭代。这个想法是在作业开始时计算使用情况rule "Maximum usage of a resource"&nbsp; &nbsp; &nbsp; &nbsp;when&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;$r : Resource()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;$p : TaskAssignment($id1 : id, $ts : timeSlot != null,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;resourceUsage!.ressource==$r,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;$usage : resourceUsage!.usagePercent);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;accumulate(TaskAssignment(timeSlot != null, timeSlot <= $ts,&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; endingSlot > $ts, id != $id1,&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; resourceUsage!.ressource==$r,&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $rate : resourceUsage!.usagePercent);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $s:sum($rate);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $s + $usage > 100)&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;scoreHolder.addHardConstraintMatch(kcontext, 100-($s + $usage));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;end