在施工阶段有使用sorterClass的方法吗？
在施工阶段有使用sorterClass的方法吗？
提问于 2022-01-18 11:04:31
问题概述：
我们给用户分配任务，只有一个任务可以分配给用户，任务可以是可变长度: 1-16小时用户一次只能执行一个任务，用户每天有8个小时。我们使用的是时间谷物模式-1粒度=1小时。由于任务是可变长度的，所以并非所有的TimeGrains都用于给定的用户。
使用默认排序不会在10分钟内返回解决方案。
我在下面的配置中取得了一些成功(结果在几秒钟内返回)
<constructionHeuristic>
<changeMoveSelector>
<selectionOrder>RANDOM</selectionOrder>
<selectedCountLimit>300</selectedCountLimit>
<valueSelector variableName="user"/>
</changeMoveSelector>
<changeMoveSelector>
<valueSelector variableName="startDate"/>
</changeMoveSelector>
</constructionHeuristic>然而，这似乎导致任务分配不均。我试图实现一个自定义排序，即
<sorterClass>com.example.UserSelectionSorter</sorterClass>
但这会产生以下错误：
Exception in thread "main" java.lang.IllegalStateException: Replay must occur after record. The recordingEntitySelector (Recording(FromSolutionEntitySelector(SubTask)))'s hasNext() has not been called yet.
at org.optaplanner.core.impl.heuristic.selector.entity.mimic.MimicReplayingEntitySelector$ReplayingEntityIterator.hasNext(MimicReplayingEntitySelector.java:117)
at org.optaplanner.core.impl.heuristic.selector.common.iterator.AbstractOriginalChangeIterator.createUpcomingSelection(AbstractOriginalChangeIterator.java:47)
at org.optaplanner.core.impl.heuristic.selector.common.iterator.AbstractOriginalChangeIterator.createUpcomingSelection(AbstractOriginalChangeIterator.java:26)
at org.optaplanner.core.impl.heuristic.selector.common.iterator.UpcomingSelectionIterator.hasNext(UpcomingSelectionIterator.java:43)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:132)
at org.optaplanner.core.impl.heuristic.selector.move.decorator.AbstractCachingMoveSelector.constructCache(AbstractCachingMoveSelector.java:77)
at org.optaplanner.core.impl.heuristic.selector.move.decorator.SortingMoveSelector.constructCache(SortingMoveSelector.java:43)
at org.optaplanner.core.impl.heuristic.selector.common.SelectionCacheLifecycleBridge.phaseStarted(SelectionCacheLifecycleBridge.java:51)
at org.optaplanner.core.impl.phase.event.PhaseLifecycleSupport.firePhaseStarted(PhaseLifecycleSupport.java:37)
at org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:50)
at org.optaplanner.core.impl.phase.event.PhaseLifecycleSupport.firePhaseStarted(PhaseLifecycleSupport.java:37)
at org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:50)
at org.optaplanner.core.impl.phase.event.PhaseLifecycleSupport.firePhaseStarted(PhaseLifecycleSupport.java:37)
at org.optaplanner.core.impl.constructionheuristic.placer.AbstractEntityPlacer.phaseStarted(AbstractEntityPlacer.java:44)
at org.optaplanner.core.impl.constructionheuristic.DefaultConstructionHeuristicPhase.phaseStarted(DefaultConstructionHeuristicPhase.java:118)
at org.optaplanner.core.impl.constructionheuristic.DefaultConstructionHeuristicPhase.solve(DefaultConstructionHeuristicPhase.java:65)
at org.optaplanner.core.impl.solver.AbstractSolver.runPhases(AbstractSolver.java:99)
at org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:192)
at com.example.App.main(App.java:50) 回答 1
Stack Overflow用户
回答已采纳
发布于 2022-01-18 14:59:43
见一种构造启发式算法的高级配置。它显式地写入模拟录音/重放。这允许您进入第一个entitySelector (而不是参考一个)，并在那里使用sorterClass。
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原文链接：
https://stackoverflow.com/questions/70754538
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