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• timefold-solver-spring-boot-autoconfigure
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• TimefoldSolverAutoConfiguration.java

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ai.timefold.solver.spring.boot.autoconfigure.TimefoldSolverAutoConfiguration Maven / Gradle / Ivy

package ai.timefold.solver.spring.boot.autoconfigure;

import static java.util.stream.Collectors.joining;

import java.io.StringWriter;
import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;

import ai.timefold.solver.core.api.domain.entity.PlanningEntity;
import ai.timefold.solver.core.api.domain.entity.PlanningPin;
import ai.timefold.solver.core.api.domain.solution.PlanningSolution;
import ai.timefold.solver.core.api.domain.variable.AnchorShadowVariable;
import ai.timefold.solver.core.api.domain.variable.CascadingUpdateShadowVariable;
import ai.timefold.solver.core.api.domain.variable.CustomShadowVariable;
import ai.timefold.solver.core.api.domain.variable.IndexShadowVariable;
import ai.timefold.solver.core.api.domain.variable.InverseRelationShadowVariable;
import ai.timefold.solver.core.api.domain.variable.NextElementShadowVariable;
import ai.timefold.solver.core.api.domain.variable.PiggybackShadowVariable;
import ai.timefold.solver.core.api.domain.variable.PlanningListVariable;
import ai.timefold.solver.core.api.domain.variable.PlanningVariable;
import ai.timefold.solver.core.api.domain.variable.PreviousElementShadowVariable;
import ai.timefold.solver.core.api.domain.variable.ShadowVariable;
import ai.timefold.solver.core.api.score.ScoreManager;
import ai.timefold.solver.core.api.score.calculator.EasyScoreCalculator;
import ai.timefold.solver.core.api.score.calculator.IncrementalScoreCalculator;
import ai.timefold.solver.core.api.score.stream.ConstraintProvider;
import ai.timefold.solver.core.api.solver.SolutionManager;
import ai.timefold.solver.core.api.solver.SolverFactory;
import ai.timefold.solver.core.api.solver.SolverManager;
import ai.timefold.solver.core.config.score.director.ScoreDirectorFactoryConfig;
import ai.timefold.solver.core.config.solver.SolverConfig;
import ai.timefold.solver.core.config.solver.termination.TerminationConfig;
import ai.timefold.solver.core.impl.io.jaxb.SolverConfigIO;
import ai.timefold.solver.spring.boot.autoconfigure.config.SolverProperties;
import ai.timefold.solver.spring.boot.autoconfigure.config.TerminationProperties;
import ai.timefold.solver.spring.boot.autoconfigure.config.TimefoldProperties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.beans.factory.aot.BeanFactoryInitializationAotContribution;
import org.springframework.beans.factory.aot.BeanFactoryInitializationAotProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.context.properties.bind.BindResult;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.NativeDetector;
import org.springframework.core.env.Environment;

@Configuration(proxyBeanMethods = false)
@ConditionalOnClass({ SolverConfig.class, SolverFactory.class, ScoreManager.class, SolutionManager.class, SolverManager.class })
@ConditionalOnMissingBean({ SolverConfig.class, SolverFactory.class, ScoreManager.class, SolutionManager.class,
        SolverManager.class })
@EnableConfigurationProperties({ TimefoldProperties.class })
public class TimefoldSolverAutoConfiguration
        implements BeanClassLoaderAware, ApplicationContextAware, EnvironmentAware, BeanFactoryInitializationAotProcessor,
        BeanDefinitionRegistryPostProcessor {

    private static final Log LOG = LogFactory.getLog(TimefoldSolverAutoConfiguration.class);
    private static final String DEFAULT_SOLVER_CONFIG_NAME = "getSolverConfig";
    private static final Class[] PLANNING_ENTITY_FIELD_ANNOTATIONS = new Class[] {
            PlanningPin.class,
            PlanningVariable.class,
            PlanningListVariable.class,
            AnchorShadowVariable.class,
            CustomShadowVariable.class,
            IndexShadowVariable.class,
            InverseRelationShadowVariable.class,
            NextElementShadowVariable.class,
            PiggybackShadowVariable.class,
            PreviousElementShadowVariable.class,
            ShadowVariable.class,
            CascadingUpdateShadowVariable.class
    };
    private ApplicationContext context;
    private ClassLoader beanClassLoader;
    private TimefoldProperties timefoldProperties;

    protected TimefoldSolverAutoConfiguration() {
    }

    @Override
    public void setBeanClassLoader(ClassLoader beanClassLoader) {
        this.beanClassLoader = beanClassLoader;
    }

    @Override
    public void setApplicationContext(ApplicationContext context) throws BeansException {
        this.context = context;
    }

    @Override
    public void setEnvironment(Environment environment) {
        // postProcessBeanFactory runs before creating any bean, but we need TimefoldProperties.
        // Therefore, we use the Environment to load the properties
        BindResult result = Binder.get(environment).bind("timefold", TimefoldProperties.class);
        this.timefoldProperties = result.orElseGet(TimefoldProperties::new);
    }

    private Map getSolverConfigMap() {
        IncludeAbstractClassesEntityScanner entityScanner = new IncludeAbstractClassesEntityScanner(this.context);
        if (!entityScanner.hasSolutionOrEntityClasses()) {
            LOG.warn(
                    """
                            Skipping Timefold loading because there are no @%s  or @%s annotated classes.
                            Maybe your annotated classes are not in a subpackage of your @%s annotated class's package.
                            Maybe move your planning solution and entity classes to your application class's (sub)package (or use @%s)."""
                            .formatted(PlanningSolution.class.getSimpleName(), PlanningEntity.class.getSimpleName(),
                                    SpringBootApplication.class.getSimpleName(), EntityScan.class.getSimpleName()));
            return Map.of();
        }
        Map solverConfigMap = new HashMap<>();
        // Step 1 - create all SolverConfig
        // If the config map is empty, we build the config using the default solver name
        if (timefoldProperties.getSolver() == null || timefoldProperties.getSolver().isEmpty()) {
            solverConfigMap.put(TimefoldProperties.DEFAULT_SOLVER_NAME,
                    createSolverConfig(timefoldProperties, TimefoldProperties.DEFAULT_SOLVER_NAME));
        } else {
            timefoldProperties.getSolver().keySet()
                    .forEach(solverName -> solverConfigMap.put(solverName, createSolverConfig(timefoldProperties, solverName)));
        }
        // Step 2 - validate all SolverConfig definitions
        assertNoMemberAnnotationWithoutClassAnnotation(entityScanner);
        assertSolverConfigSolutionClasses(entityScanner, solverConfigMap);
        assertSolverConfigEntityClasses(entityScanner);
        assertSolverConfigConstraintClasses(entityScanner, solverConfigMap);

        // Step 3 - load all additional information per SolverConfig
        solverConfigMap.forEach(
                (solverName, solverConfig) -> loadSolverConfig(entityScanner, timefoldProperties, solverName, solverConfig));
        return solverConfigMap;
    }

    @Override
    public BeanFactoryInitializationAotContribution processAheadOfTime(ConfigurableListableBeanFactory beanFactory) {
        Map solverConfigMap = getSolverConfigMap();
        return new TimefoldSolverAotContribution(solverConfigMap);
    }

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        Map solverConfigMap = getSolverConfigMap();
        SolverConfigIO solverConfigIO = new SolverConfigIO();
        registry.registerBeanDefinition(TimefoldSolverAotFactory.class.getName(),
                new RootBeanDefinition(TimefoldSolverAotFactory.class));
        if (solverConfigMap.isEmpty()) {
            RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(SolverConfig.class);
            rootBeanDefinition.setFactoryBeanName(TimefoldSolverAotFactory.class.getName());
            rootBeanDefinition.setFactoryMethodName("solverConfigSupplier");
            StringWriter solverXmlOutput = new StringWriter();
            solverConfigIO.write(new SolverConfig(), solverXmlOutput);
            rootBeanDefinition.getConstructorArgumentValues().addGenericArgumentValue(
                    solverXmlOutput.toString());
            registry.registerBeanDefinition(DEFAULT_SOLVER_CONFIG_NAME, rootBeanDefinition);
            return;
        }

        if (timefoldProperties.getSolver() == null || timefoldProperties.getSolver().size() == 1) {
            RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(SolverConfig.class);
            rootBeanDefinition.setFactoryBeanName(TimefoldSolverAotFactory.class.getName());
            rootBeanDefinition.setFactoryMethodName("solverConfigSupplier");
            StringWriter solverXmlOutput = new StringWriter();
            solverConfigIO.write(solverConfigMap.values().iterator().next(), solverXmlOutput);
            rootBeanDefinition.getConstructorArgumentValues().addGenericArgumentValue(
                    solverXmlOutput.toString());
            registry.registerBeanDefinition(DEFAULT_SOLVER_CONFIG_NAME, rootBeanDefinition);
        } else {
            // Only SolverManager can be injected for multiple solver configurations
            solverConfigMap.forEach((solverName, solverConfig) -> {
                RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(SolverManager.class);
                rootBeanDefinition.setFactoryBeanName(TimefoldSolverAotFactory.class.getName());
                rootBeanDefinition.setFactoryMethodName("solverManagerSupplier");
                StringWriter solverXmlOutput = new StringWriter();
                solverConfigIO.write(solverConfig, solverXmlOutput);
                rootBeanDefinition.getConstructorArgumentValues().addGenericArgumentValue(
                        solverXmlOutput.toString());
                registry.registerBeanDefinition(solverName, rootBeanDefinition);
            });
        }
    }

    private SolverConfig createSolverConfig(TimefoldProperties timefoldProperties, String solverName) {
        // 1 - The solver configuration takes precedence over root and default settings
        Optional solverConfigXml = timefoldProperties.getSolverConfig(solverName)
                .map(SolverProperties::getSolverConfigXml);

        // 2 - Root settings
        if (solverConfigXml.isEmpty()) {
            solverConfigXml = Optional.ofNullable(timefoldProperties.getSolverConfigXml());
        }

        SolverConfig solverConfig;
        if (solverConfigXml.isPresent()) {
            String solverUrl = solverConfigXml.get();
            if (beanClassLoader.getResource(solverUrl) == null) {
                String message =
                        "Invalid timefold.solverConfigXml property (%s): that classpath resource does not exist."
                                .formatted(solverUrl);
                if (!solverName.equals(TimefoldProperties.DEFAULT_SOLVER_NAME)) {
                    message =
                            "Invalid timefold.solver.\"%s\".solverConfigXML property (%s): that classpath resource does not exist."
                                    .formatted(solverName, solverUrl);
                }
                throw new IllegalStateException(message);
            }
            solverConfig = SolverConfig.createFromXmlResource(solverUrl);
        } else if (beanClassLoader.getResource(TimefoldProperties.DEFAULT_SOLVER_CONFIG_URL) != null) {
            // 3 - Default file URL
            solverConfig = SolverConfig.createFromXmlResource(
                    TimefoldProperties.DEFAULT_SOLVER_CONFIG_URL);
        } else {
            solverConfig = new SolverConfig(beanClassLoader);
        }

        return solverConfig;
    }

    private void loadSolverConfig(IncludeAbstractClassesEntityScanner entityScanner, TimefoldProperties timefoldProperties,
            String solverName, SolverConfig solverConfig) {
        if (solverConfig.getSolutionClass() == null) {
            solverConfig.setSolutionClass(entityScanner.findFirstSolutionClass());
        }
        var solverEntityClassList = solverConfig.getEntityClassList();
        if (solverEntityClassList == null) {
            solverConfig.setEntityClassList(entityScanner.findEntityClassList());
        } else {
            var entityClassCount = solverEntityClassList.stream()
                    .filter(Objects::nonNull)
                    .count();
            if (entityClassCount == 0L) {
                throw new IllegalStateException(
                        """
                                The solverConfig's entityClassList (%s) does not contain any non-null entries.
                                Maybe the classes listed there do not actually exist and therefore deserialization turned them to null?"""
                                .formatted(solverEntityClassList.stream().map(Class::getSimpleName)
                                        .collect(joining(", "))));
            }
        }
        timefoldProperties.getSolverConfig(solverName)
                .ifPresentOrElse(
                        solverProperties -> applyScoreDirectorFactoryProperties(entityScanner, solverConfig, solverProperties),
                        () -> applyScoreDirectorFactoryProperties(entityScanner, solverConfig));
    }

    private void applyScoreDirectorFactoryProperties(IncludeAbstractClassesEntityScanner entityScanner,
            SolverConfig solverConfig, SolverProperties solverProperties) {
        applyScoreDirectorFactoryProperties(entityScanner, solverConfig);
        if (solverProperties.getConstraintStreamAutomaticNodeSharing() != null
                && solverProperties.getConstraintStreamAutomaticNodeSharing()) {
            if (NativeDetector.inNativeImage()) {
                throw new UnsupportedOperationException(
                        "Constraint stream automatic node sharing is unsupported in a Spring native image.");
            }
            Objects.requireNonNull(solverConfig.getScoreDirectorFactoryConfig())
                    .setConstraintStreamAutomaticNodeSharing(true);
        }
        if (solverProperties.getEnvironmentMode() != null) {
            solverConfig.setEnvironmentMode(solverProperties.getEnvironmentMode());
        }
        if (solverProperties.getDomainAccessType() != null) {
            solverConfig.setDomainAccessType(solverProperties.getDomainAccessType());
        }
        if (solverProperties.getNearbyDistanceMeterClass() != null) {
            solverConfig.setNearbyDistanceMeterClass(solverProperties.getNearbyDistanceMeterClass());
        }
        if (solverProperties.getDaemon() != null) {
            solverConfig.setDaemon(solverProperties.getDaemon());
        }
        if (solverProperties.getMoveThreadCount() != null) {
            solverConfig.setMoveThreadCount(solverProperties.getMoveThreadCount());
        }
        applyTerminationProperties(solverConfig, solverProperties.getTermination());
    }

    private void applyScoreDirectorFactoryProperties(IncludeAbstractClassesEntityScanner entityScanner,
            SolverConfig solverConfig) {
        if (solverConfig.getScoreDirectorFactoryConfig() == null) {
            solverConfig.setScoreDirectorFactoryConfig(defaultScoreDirectoryFactoryConfig(entityScanner));
        }
    }

    private static ScoreDirectorFactoryConfig
            defaultScoreDirectoryFactoryConfig(IncludeAbstractClassesEntityScanner entityScanner) {
        ScoreDirectorFactoryConfig scoreDirectorFactoryConfig = new ScoreDirectorFactoryConfig();
        scoreDirectorFactoryConfig
                .setEasyScoreCalculatorClass(entityScanner.findFirstImplementingClass(EasyScoreCalculator.class));
        scoreDirectorFactoryConfig
                .setConstraintProviderClass(entityScanner.findFirstImplementingClass(ConstraintProvider.class));
        scoreDirectorFactoryConfig
                .setIncrementalScoreCalculatorClass(entityScanner.findFirstImplementingClass(IncrementalScoreCalculator.class));

        return scoreDirectorFactoryConfig;
    }

    static void applyTerminationProperties(SolverConfig solverConfig, TerminationProperties terminationProperties) {
        TerminationConfig terminationConfig = solverConfig.getTerminationConfig();
        if (terminationConfig == null) {
            terminationConfig = new TerminationConfig();
            solverConfig.setTerminationConfig(terminationConfig);
        }
        if (terminationProperties != null) {
            if (terminationProperties.getSpentLimit() != null) {
                terminationConfig.overwriteSpentLimit(terminationProperties.getSpentLimit());
            }
            if (terminationProperties.getUnimprovedSpentLimit() != null) {
                terminationConfig.overwriteUnimprovedSpentLimit(terminationProperties.getUnimprovedSpentLimit());
            }
            if (terminationProperties.getBestScoreLimit() != null) {
                terminationConfig.setBestScoreLimit(terminationProperties.getBestScoreLimit());
            }
        }
    }

    private static void assertNoMemberAnnotationWithoutClassAnnotation(IncludeAbstractClassesEntityScanner entityScanner) {
        List> timefoldFieldAnnotationList =
                entityScanner.findClassesWithAnnotation(PLANNING_ENTITY_FIELD_ANNOTATIONS);
        List> entityList = entityScanner.findEntityClassList();

        List nonEntityClassList = timefoldFieldAnnotationList.stream().filter(clazz -> !entityList.contains(clazz))
                .map(Class::getSimpleName).toList();
        if (!nonEntityClassList.isEmpty()) {
            throw new IllegalStateException(
                    """
                            The classes ([%s]) do not have the %s annotation, even though they contain properties reserved for planning entities.
                            Maybe add a @%s annotation on the classes ([%s])."""
                            .formatted(String.join(", ", nonEntityClassList), PlanningEntity.class.getSimpleName(),
                                    PlanningEntity.class.getSimpleName(), String.join(", ", nonEntityClassList)));
        }
    }

    private static void assertSolverConfigSolutionClasses(IncludeAbstractClassesEntityScanner entityScanner,
            Map solverConfigMap) {
        // Validate the solution class
        // No solution class
        String emptyListErrorMessage = """
                No classes were found with a @%s annotation.
                Maybe your @%s annotated class is not in a subpackage of your @%s annotated class's package.
                Maybe move your planning solution class to your application class's (sub)package (or use @%s).""".formatted(
                PlanningSolution.class.getSimpleName(), PlanningSolution.class.getSimpleName(),
                SpringBootApplication.class.getSimpleName(), EntityScan.class.getSimpleName());
        assertEmptyInstances(entityScanner, PlanningSolution.class, emptyListErrorMessage);
        // Multiple classes and single solver
        try {
            Set> classes = entityScanner.scan(PlanningSolution.class);
            if (classes.size() > 1 && solverConfigMap.size() == 1) {
                throw new IllegalStateException(
                        "Multiple classes ([%s]) found in the classpath with a @%s annotation.".formatted(
                                classes.stream().map(Class::getSimpleName).collect(joining(", ")),
                                PlanningSolution.class.getSimpleName()));
            }
            // Multiple classes and at least one solver config does not specify the solution class
            List solverConfigWithoutSolutionClassList = solverConfigMap.entrySet().stream()
                    .filter(e -> e.getValue().getSolutionClass() == null)
                    .map(Map.Entry::getKey)
                    .toList();
            if (classes.size() > 1 && !solverConfigWithoutSolutionClassList.isEmpty()) {
                throw new IllegalStateException(
                        """
                                Some solver configs (%s) don't specify a %s class, yet there are multiple available (%s) on the classpath.
                                Maybe set the XML config file to the related solver configs, or add the missing solution classes to the XML files,
                                or remove the unnecessary solution classes from the classpath."""
                                .formatted(String.join(", ", solverConfigWithoutSolutionClassList),
                                        PlanningSolution.class.getSimpleName(),
                                        classes.stream().map(Class::getSimpleName).collect(joining(", "))));
            }
            // Unused solution classes
            List unusedSolutionClassList = classes.stream()
                    .map(Class::getName)
                    .filter(planningClassName -> solverConfigMap.values().stream().filter(c -> c.getSolutionClass() != null)
                            .noneMatch(c -> c.getSolutionClass().getName().equals(planningClassName)))
                    .toList();
            if (classes.size() > 1 && !unusedSolutionClassList.isEmpty()) {
                throw new IllegalStateException(
                        "Unused classes ([%s]) found with a @%s annotation.".formatted(
                                String.join(", ", unusedSolutionClassList),
                                PlanningSolution.class.getSimpleName()));
            }
            assertTargetClasses(classes, PlanningSolution.class.getSimpleName());
        } catch (ClassNotFoundException e) {
            throw new IllegalStateException(
                    "Scanning for @%s annotations failed.".formatted(PlanningSolution.class.getSimpleName()), e);
        }
    }

    private static void assertSolverConfigEntityClasses(IncludeAbstractClassesEntityScanner entityScanner) {
        // No Entity class
        String emptyListErrorMessage = """
                No classes were found with a @%s annotation.
                Maybe your @%s annotated class(es) are not in a subpackage of your @%s annotated class's package.
                Maybe move your planning entity classes to your application class's (sub)package(or use @%s)."""
                .formatted(
                        PlanningEntity.class.getSimpleName(), PlanningEntity.class.getSimpleName(),
                        SpringBootApplication.class.getSimpleName(), EntityScan.class.getSimpleName());
        assertEmptyInstances(entityScanner, PlanningEntity.class, emptyListErrorMessage);
        assertTargetClasses(entityScanner.findEntityClassList(), PlanningEntity.class.getSimpleName());
    }

    private static void assertSolverConfigConstraintClasses(
            IncludeAbstractClassesEntityScanner entityScanner, Map solverConfigMap) {
        List> simpleScoreClassList =
                entityScanner.findImplementingClassList(EasyScoreCalculator.class);
        List> constraintScoreClassList =
                entityScanner.findImplementingClassList(ConstraintProvider.class);
        List> incrementalScoreClassList =
                entityScanner.findImplementingClassList(IncrementalScoreCalculator.class);
        // No score calculators
        if (simpleScoreClassList.isEmpty() && constraintScoreClassList.isEmpty()
                && incrementalScoreClassList.isEmpty()) {
            throw new IllegalStateException(
                    """
                            No classes found that implement %s, %s, or %s.
                            Maybe your %s class is not in a subpackage of your @%s annotated class's package."
                            Maybe move your %s class to your application class's (sub)package (or use @%s)."""
                            .formatted(EasyScoreCalculator.class.getSimpleName(),
                                    ConstraintProvider.class.getSimpleName(), IncrementalScoreCalculator.class.getSimpleName(),
                                    ConstraintProvider.class.getSimpleName(), SpringBootApplication.class.getSimpleName(),
                                    ConstraintProvider.class.getSimpleName(), EntityScan.class.getSimpleName()));
        }
        assertSolverConfigsSpecifyScoreCalculatorWhenAmbigious(solverConfigMap, simpleScoreClassList, constraintScoreClassList,
                incrementalScoreClassList);
        assertNoUnusedScoreClasses(solverConfigMap, simpleScoreClassList, constraintScoreClassList, incrementalScoreClassList);
    }

    private static void assertSolverConfigsSpecifyScoreCalculatorWhenAmbigious(Map solverConfigMap,
            List> simpleScoreClassList,
            List> constraintScoreClassList,
            List> incrementalScoreClassList) {
        // Single solver, multiple score calculators
        String errorMessage = "Multiple score calculator classes (%s) that implements %s were found in the classpath.";
        if (simpleScoreClassList.size() > 1 && solverConfigMap.size() == 1) {
            throw new IllegalStateException(errorMessage.formatted(
                    simpleScoreClassList.stream().map(Class::getSimpleName).collect(joining(", ")),
                    EasyScoreCalculator.class.getSimpleName()));
        }
        if (constraintScoreClassList.size() > 1 && solverConfigMap.size() == 1) {
            throw new IllegalStateException(errorMessage.formatted(
                    constraintScoreClassList.stream().map(Class::getSimpleName).collect(joining(", ")),
                    ConstraintProvider.class.getSimpleName()));
        }
        if (incrementalScoreClassList.size() > 1 && solverConfigMap.size() == 1) {
            throw new IllegalStateException(errorMessage.formatted(
                    incrementalScoreClassList.stream().map(Class::getSimpleName).collect(joining(", ")),
                    IncrementalScoreCalculator.class.getSimpleName()));
        }
        // Multiple solvers, multiple score calculators
        errorMessage =
                """
                        Some solver configs (%s) don't specify a %s score calculator class, yet there are multiple available (%s) on the classpath.
                        Maybe set the XML config file to the related solver configs, or add the missing score calculator to the XML files,
                        or remove the unnecessary score calculator from the classpath.""";
        List solverConfigWithoutConstraintClassList = solverConfigMap.entrySet().stream()
                .filter(e -> e.getValue().getScoreDirectorFactoryConfig() == null
                        || e.getValue().getScoreDirectorFactoryConfig().getEasyScoreCalculatorClass() == null)
                .map(Map.Entry::getKey)
                .toList();
        if (simpleScoreClassList.size() > 1 && !solverConfigWithoutConstraintClassList.isEmpty()) {
            throw new IllegalStateException(errorMessage.formatted(
                    String.join(", ", solverConfigWithoutConstraintClassList),
                    EasyScoreCalculator.class.getSimpleName(),
                    simpleScoreClassList.stream().map(Class::getSimpleName).collect(joining(", "))));
        }
        solverConfigWithoutConstraintClassList = solverConfigMap.entrySet().stream()
                .filter(e -> e.getValue().getScoreDirectorFactoryConfig() == null
                        || e.getValue().getScoreDirectorFactoryConfig().getConstraintProviderClass() == null)
                .map(Map.Entry::getKey)
                .toList();
        if (constraintScoreClassList.size() > 1 && !solverConfigWithoutConstraintClassList.isEmpty()) {
            throw new IllegalStateException(errorMessage.formatted(
                    String.join(", ", solverConfigWithoutConstraintClassList),
                    ConstraintProvider.class.getSimpleName(),
                    constraintScoreClassList.stream().map(Class::getSimpleName).collect(joining(", "))));
        }
        solverConfigWithoutConstraintClassList = solverConfigMap.entrySet().stream()
                .filter(e -> e.getValue().getScoreDirectorFactoryConfig() == null
                        || e.getValue().getScoreDirectorFactoryConfig().getIncrementalScoreCalculatorClass() == null)
                .map(Map.Entry::getKey)
                .toList();
        if (incrementalScoreClassList.size() > 1 && !solverConfigWithoutConstraintClassList.isEmpty()) {
            throw new IllegalStateException(errorMessage.formatted(
                    String.join(", ", solverConfigWithoutConstraintClassList),
                    IncrementalScoreCalculator.class.getSimpleName(),
                    incrementalScoreClassList.stream().map(Class::getSimpleName).collect(joining(", "))));
        }
    }

    private static void assertNoUnusedScoreClasses(Map solverConfigMap,
            List> simpleScoreClassList,
            List> constraintScoreClassList,
            List> incrementalScoreClassList) {
        String errorMessage;
        List solverConfigWithUnusedSolutionClassList = simpleScoreClassList.stream()
                .map(Class::getName)
                .filter(className -> solverConfigMap.values().stream()
                        .filter(c -> c.getScoreDirectorFactoryConfig() != null
                                && c.getScoreDirectorFactoryConfig().getEasyScoreCalculatorClass() != null)
                        .noneMatch(c -> c.getScoreDirectorFactoryConfig().getEasyScoreCalculatorClass().getName()
                                .equals(className)))
                .toList();
        errorMessage = "Unused classes ([%s]) that implements %s were found.";
        if (simpleScoreClassList.size() > 1 && !solverConfigWithUnusedSolutionClassList.isEmpty()) {
            throw new IllegalStateException(errorMessage.formatted(String.join(", ", solverConfigWithUnusedSolutionClassList),
                    EasyScoreCalculator.class.getSimpleName()));
        }
        solverConfigWithUnusedSolutionClassList = constraintScoreClassList.stream()
                .map(Class::getName)
                .filter(className -> solverConfigMap.values().stream()
                        .filter(c -> c.getScoreDirectorFactoryConfig() != null
                                && c.getScoreDirectorFactoryConfig().getConstraintProviderClass() != null)
                        .noneMatch(c -> c.getScoreDirectorFactoryConfig().getConstraintProviderClass().getName()
                                .equals(className)))
                .toList();
        if (constraintScoreClassList.size() > 1 && !solverConfigWithUnusedSolutionClassList.isEmpty()) {
            throw new IllegalStateException(errorMessage.formatted(String.join(", ", solverConfigWithUnusedSolutionClassList),
                    ConstraintProvider.class.getSimpleName()));
        }
        solverConfigWithUnusedSolutionClassList = incrementalScoreClassList.stream()
                .map(Class::getName)
                .filter(className -> solverConfigMap.values().stream()
                        .filter(c -> c.getScoreDirectorFactoryConfig() != null
                                && c.getScoreDirectorFactoryConfig().getIncrementalScoreCalculatorClass() != null)
                        .noneMatch(c -> c.getScoreDirectorFactoryConfig().getIncrementalScoreCalculatorClass().getName()
                                .equals(className)))
                .toList();
        if (incrementalScoreClassList.size() > 1 && !solverConfigWithUnusedSolutionClassList.isEmpty()) {
            throw new IllegalStateException(errorMessage.formatted(String.join(", ", solverConfigWithUnusedSolutionClassList),
                    IncrementalScoreCalculator.class.getSimpleName()));
        }
    }

    private static void assertEmptyInstances(IncludeAbstractClassesEntityScanner entityScanner,
            Class clazz,
            String errorMessage) {
        try {
            Collection> classInstanceCollection = entityScanner.scan(clazz);
            if (classInstanceCollection.isEmpty()) {
                throw new IllegalStateException(errorMessage);
            }
        } catch (ClassNotFoundException e) {
            throw new IllegalStateException("Scanning for @%s annotations failed.".formatted(clazz.getSimpleName()), e);
        }
    }

    private static void assertTargetClasses(Collection> targetCollection, String targetAnnotation) {
        List invalidClasses = targetCollection.stream()
                .filter(target -> target.isRecord() || target.isEnum() || target.isPrimitive())
                .map(Class::getSimpleName)
                .toList();
        if (!invalidClasses.isEmpty()) {
            throw new IllegalStateException(
                    "All classes ([%s]) annotated with @%s must be a class.".formatted(
                            String.join(", ", invalidClasses),
                            targetAnnotation));
        }
    }
}