TimeFold员工调度：正确构建SolverManager及动态终止求解器咨询

我正在定制TimeFold员工调度示例，原EmployeeScheduleResource类通过构造函数注入SolverManager对象，核心代码如下：

public class EmployeeScheduleResource {
    SolverManager<EmployeeSchedule, String> solverManager;
    SolutionManager<EmployeeSchedule, HardMediumSoftScore> solutionManager;

    @Inject
    public EmployeeScheduleResource(SolverManager<EmployeeSchedule, String> solverManager,SolutionManager<EmployeeSchedule, HardMediumSoftScore> solutionManager) {
        this.solverManager = solverManager;
        this.solutionManager = solutionManager;

    }
}

现需SolverManager加载XML配置文件中的终止规则：

<termination>
  <unimprovedSecondsSpentLimit>30</unimprovedSecondsSpentLimit>
  <unimprovedScoreDifferenceThreshold>0hard/0medium/1soft</unimprovedScoreDifferenceThreshold>
</termination>

我当前自行创建SolverManager的方式并不恰当，恳请提供正确实现方案。
另外，能否使用AbstractTermination<EmployeeRoster>类处理终止逻辑？此前在Optaplanner中可通过扩展该类实现自定义逻辑，但固定配置无法在运行时计算得分提升率，我需要根据一段时间内得分未提升的比例来判定终止时机。

一、正确加载XML终止配置的SolverManager实现 #

TimeFold推荐通过依赖注入框架（如Spring Boot、Quarkus）管理SolverManager，确保配置自动加载；无DI场景下也可手动读取配置初始化。

1. 依赖注入场景（以Spring Boot为例） #

• 将完整的Solver XML配置文件（如employeeScheduleSolverConfig.xml）放在src/main/resources目录下，终止规则需作为<solver>节点的子节点存在
• 直接通过构造函数注入SolverManager，DI框架会自动读取XML中的终止规则：

@RestController
public class EmployeeScheduleResource {
    private final SolverManager<EmployeeSchedule, String> solverManager;
    private final SolutionManager<EmployeeSchedule, HardMediumSoftScore> solutionManager;

    public EmployeeScheduleResource(SolverManager<EmployeeSchedule, String> solverManager,
                                   SolutionManager<EmployeeSchedule, HardMediumSoftScore> solutionManager) {
        this.solverManager = solverManager;
        this.solutionManager = solutionManager;
    }

    @PostMapping("/solve")
    public ResponseEntity<SolverJob<EmployeeSchedule, String>> solve(@RequestBody EmployeeSchedule problem) {
        SolverJob<EmployeeSchedule, String> job = solverManager.solve(UUID.randomUUID().toString(), problem);
        return ResponseEntity.accepted().body(job);
    }
}

2. 手动创建场景（无DI框架） #

显式加载SolverConfig并关联XML配置，确保终止规则被读取：

public class EmployeeScheduleResource {
    private final SolverManager<EmployeeSchedule, String> solverManager;
    private final SolutionManager<EmployeeSchedule, HardMediumSoftScore> solutionManager;

    public EmployeeScheduleResource() {
        // 读取XML配置文件，自动加载终止规则
        SolverConfig solverConfig = SolverConfig.createFromXmlResource("employeeScheduleSolverConfig.xml");
        SolverFactory<EmployeeSchedule> solverFactory = SolverFactory.create(solverConfig);
        this.solverManager = SolverManager.create(solverFactory);
        this.solutionManager = SolutionManager.create(solverFactory);
    }
}

完整XML配置示例：

<?xml version="1.0" encoding="UTF-8"?>
<solver xmlns="https://timefold.ai/xsd/solver" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="https://timefold.ai/xsd/solver https://timefold.ai/xsd/solver/solver.xsd">
  <solutionClass>com.yourpackage.EmployeeSchedule</solutionClass>
  <entityClass>com.yourpackage.EmployeeShiftAssignment</entityClass>
  
  <!-- 终止规则配置 -->
  <termination>
    <unimprovedSecondsSpentLimit>30</unimprovedSecondsSpentLimit>
    <unimprovedScoreDifferenceThreshold>0hard/0medium/1soft</unimprovedScoreDifferenceThreshold>
  </termination>
  
  <!-- 其他配置（评分器、启发式算法等） -->
</solver>

二、自定义AbstractTermination实现动态终止逻辑 #

可以通过扩展AbstractTermination<EmployeeSchedule>（泛型需匹配你的解决方案类）实现基于得分提升率的动态终止，TimeFold完全兼容OptaPlanner的自定义终止逻辑。

1. 自定义Termination类 #

public class ScoreImprovementRateTermination extends AbstractTermination<EmployeeSchedule> {
    private final long checkWindowSeconds;
    private final double minImprovementRateThreshold;

    private Score initialScoreInWindow;
    private long windowStartTimeMillis;

    public ScoreImprovementRateTermination(long checkWindowSeconds, double minImprovementRateThreshold) {
        this.checkWindowSeconds = checkWindowSeconds;
        this.minImprovementRateThreshold = minImprovementRateThreshold;
    }

    @Override
    public boolean isTerminated(ScoreDirector<EmployeeSchedule> scoreDirector) {
        EmployeeSchedule solution = scoreDirector.getWorkingSolution();
        Score currentScore = scoreDirector.calculateScore();
        long currentTimeMillis = System.currentTimeMillis();

        if (initialScoreInWindow == null) {
            initialScoreInWindow = currentScore;
            windowStartTimeMillis = currentTimeMillis;
            return false;
        }

        if (currentTimeMillis - windowStartTimeMillis >= checkWindowSeconds * 1000L) {
            int initialSoftScore = initialScoreInWindow.getSoftScore();
            int currentSoftScore = currentScore.getSoftScore();
            
            // 计算得分提升率，可按需调整计算逻辑
            double improvementRate = initialSoftScore != 0 
                ? (double) (currentSoftScore - initialSoftScore) / Math.abs(initialSoftScore) 
                : 0.0;

            boolean shouldTerminate = improvementRate < minImprovementRateThreshold;
            // 重置窗口，持续监控后续求解阶段
            initialScoreInWindow = currentScore;
            windowStartTimeMillis = currentTimeMillis;
            return shouldTerminate;
        }

        return false;
    }

    @Override
    public double calculateTimeGradient(ScoreDirector<EmployeeSchedule> scoreDirector) {
        // 按需实现时间梯度（用于进度展示等场景）
        return 0.0;
    }
}

2. 关联自定义Termination到SolverConfig #

方式1：XML配置关联

替换XML中的<termination>节点为自定义类：

<termination class="com.yourpackage.ScoreImprovementRateTermination">
  <checkWindowSeconds>60</checkWindowSeconds>
  <minImprovementRateThreshold>0.05</minImprovementRateThreshold>
</termination>

方式2：代码动态配置

SolverConfig solverConfig = SolverConfig.createFromXmlResource("employeeScheduleSolverConfig.xml");
solverConfig.setTerminationConfig(new TerminationConfig()
    .withTerminationClass(ScoreImprovementRateTermination.class)
    .withTerminationProperty("checkWindowSeconds", 60)
    .withTerminationProperty("minImprovementRateThreshold", 0.05));

SolverFactory<EmployeeSchedule> solverFactory = SolverFactory.create(solverConfig);
SolverManager<EmployeeSchedule, String> solverManager = SolverManager.create(solverFactory);

内容的提问来源于stack exchange，提问作者I. Ahmed