Spring 条件装配 Condition 分析

1. 条件装配 Condition

三个过滤器：OnClassCondition, OnBeanCondition, OnWebApplicationCondition

顶层接口Condition

@FunctionalInterface
public interface Condition {
    boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata);
}

条件装配 AutoConfigurationImportSelector.ConfigurationClassFilter#filter

public class AutoConfigurationImportSelector implements DeferredImportSelector, BeanClassLoaderAware,
        ResourceLoaderAware, BeanFactoryAware, EnvironmentAware, Ordered {

    private static class ConfigurationClassFilter {

        private final List filters;

        List filter(List configurations) {
            // ...
            for (AutoConfigurationImportFilter filter : this.filters) {
                boolean[] match = filter.match(candidates, this.autoConfigurationMetadata);
                // ...
        }
    }
}

public interface AutoConfigurationImportFilter {
    boolean[] match(String[] autoConfigurationClasses, AutoConfigurationMetadata autoConfigurationMetadata);
}

具体实现

abstract class FilteringSpringBootCondition extends SpringBootCondition
        implements AutoConfigurationImportFilter, BeanFactoryAware, BeanClassLoaderAware {

    @Override
    public boolean[] match(String[] autoConfigurationClasses, AutoConfigurationMetadata autoConfigurationMetadata) {
        ConditionEvaluationReport report = ConditionEvaluationReport.find(this.beanFactory);
        ConditionOutcome[] outcomes = getOutcomes(autoConfigurationClasses, autoConfigurationMetadata);
        boolean[] match = new boolean[outcomes.length];
        for (int i = 0; i 

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