Optaplanner提前终止增量分数状态和解决方案之间的增量

要在OptaPlanner中提前终止增量分数状态和解决方案之间的增量，您可以使用Termination API中的BestScoreTermination或UnimprovedTimeMillisSpentTermination等终止条件。

BestScoreTermination：根据最佳分数的改善情况来终止求解过程。您可以设置一个阈值，当最佳分数在一段时间内没有改善时，终止求解过程。

import org.optaplanner.core.api.solver.SolverFactory;
import org.optaplanner.core.api.solver.SolverManager;
import org.optaplanner.core.api.solver.SolverStatus;
import org.optaplanner.core.config.solver.termination.BestScoreTerminationConfig;

public class BestScoreTerminationExample {

    public static void main(String[] args) {
        // 创建SolverFactory并构建SolverManager
        SolverFactory<MyProblemSolution> solverFactory = SolverFactory.createFromXmlResource("path/to/solverConfig.xml");
        SolverManager<MyProblemSolution, Long> solverManager = SolverManager.create(solverFactory, new SolverManagerConfig());

        // 创建BestScoreTermination并设置阈值
        BestScoreTerminationConfig terminationConfig = new BestScoreTerminationConfig();
        terminationConfig.setBestScoreLimit("0hard/0soft"); // 设置最佳分数的阈值

        // 设置终止条件
        solverManager.solverConfig().setTerminationConfig(terminationConfig);

        // 启动求解器
        solverManager.solve("solverId");

        // 获取SolverManager的状态
        SolverStatus solverStatus = solverManager.getSolverStatus("solverId");

        // 打印状态
        System.out.println("SolverManager状态: " + solverStatus);
    }
}

在上面的示例中，我们创建了一个BestScoreTerminationConfig对象，并设置了最佳分数的阈值。然后，我们将该终止条件配置应用于SolverManager的SolverConfig中。

UnimprovedTimeMillisSpentTermination：根据经过的时间来终止求解过程。您可以设置一个时间阈值，当经过一段时间后，如果最佳分数没有改善，则终止求解过程。

import org.optaplanner.core.api.solver.SolverFactory;
import org.optaplanner.core.api.solver.SolverManager;
import org.optaplanner.core.api.solver.SolverStatus;
import org.optaplanner.core.config.solver.termination.UnimprovedTimeMillisSpentTerminationConfig;

public class UnimprovedTimeMillisSpentTerminationExample {

    public static void main(String[] args) {
        // 创建SolverFactory并构建SolverManager
        SolverFactory<MyProblemSolution> solverFactory = SolverFactory.createFromXmlResource("path/to/solverConfig.xml");
        SolverManager<MyProblemSolution, Long> solverManager = SolverManager.create(solverFactory, new SolverManagerConfig());

        // 创建UnimprovedTimeMillisSpentTermination并设置阈值
        UnimprovedTimeMillisSpentTerminationConfig terminationConfig = new UnimprovedTimeMillisSpentTerminationConfig();
        terminationConfig.setMillisecondsSpentLimit(60000L); // 设置时间阈值（毫秒）

        // 设置终止条件
        solverManager.solverConfig().setTerminationConfig(terminationConfig);

        // 启动求解器
        solverManager.solve("solverId");

        // 获取SolverManager的状态
        SolverStatus solverStatus = solverManager.getSolverStatus("solverId");

        // 打印状态
        System.out.println("SolverManager状态: " + solverStatus);
    }
}

在上面的示例中，我们创建了一个UnimprovedTimeMillisSpentTerminationConfig对象，并设置了时间阈值。然后，我们将该终止条件配置应用于SolverManager的SolverConfig中。