7.2. 使用 Java API 配置 OptaPlanner solver

您可以使用 SolverConfig API 配置一个临时解决方案。这在运行时动态更改值特别有用。以下示例在 NQueens 项目中构建 Solver 之前，会根据系统属性更改正在运行的时间：

        SolverConfig solverConfig = SolverConfig.createFromXmlResource(
                "org/optaplanner/examples/nqueens/solver/nqueensSolverConfig.xml");
        solverConfig.withTerminationConfig(new TerminationConfig()
                        .withMinutesSpentLimit(userInput));

        SolverFactory<NQueens> solverFactory = SolverFactory.create(solverConfig);
        Solver<NQueens> solver = solverFactory.buildSolver();

        SolverConfig solverConfig = SolverConfig.createFromXmlResource(
                "org/optaplanner/examples/nqueens/solver/nqueensSolverConfig.xml");
        solverConfig.withTerminationConfig(new TerminationConfig()
                        .withMinutesSpentLimit(userInput));

        SolverFactory<NQueens> solverFactory = SolverFactory.create(solverConfig);
        Solver<NQueens> solver = solverFactory.buildSolver();

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解决器配置 XML 文件中的每个元素都作为软件包命名空间 org.optaplanner.core.config 中的 Config 类或一个属性提供。这些配置 类是 XML 格式的 Java 表示。它们构建软件包命名空间的运行时组件 org.optaplanner.core.impl.，并将它们汇编为有效的 Solver。

注意

要为每个用户请求动态配置 SolverFactory，在初始化过程中构建模板 SolverConfig，并将其复制为每个用户请求的复制构造器。以下示例演示了如何使用 NQueens 问题进行此操作：

    private SolverConfig template;

    public void init() {
        template = SolverConfig.createFromXmlResource(
                "org/optaplanner/examples/nqueens/solver/nqueensSolverConfig.xml");
        template.setTerminationConfig(new TerminationConfig());
    }

    // Called concurrently from different threads
    public void userRequest(..., long userInput) {
        SolverConfig solverConfig = new SolverConfig(template); // Copy it
        solverConfig.getTerminationConfig().setMinutesSpentLimit(userInput);
        SolverFactory<NQueens> solverFactory = SolverFactory.create(solverConfig);
        Solver<NQueens> solver = solverFactory.buildSolver();
        ...
    }

    private SolverConfig template;

    public void init() {
        template = SolverConfig.createFromXmlResource(
                "org/optaplanner/examples/nqueens/solver/nqueensSolverConfig.xml");
        template.setTerminationConfig(new TerminationConfig());
    }

    // Called concurrently from different threads
    public void userRequest(..., long userInput) {
        SolverConfig solverConfig = new SolverConfig(template); // Copy it
        solverConfig.getTerminationConfig().setMinutesSpentLimit(userInput);
        SolverFactory<NQueens> solverFactory = SolverFactory.create(solverConfig);
        Solver<NQueens> solver = solverFactory.buildSolver();
        ...
    }

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7.2. 使用 Java API 配置 OptaPlanner solver

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