SpringBoot - 自动装配 源码解析

/**
	 * Return the {@link AutoConfigurationEntry} based on the {@link AnnotationMetadata}
	 * of the importing {@link Configuration @Configuration} class.
	 * @param annotationMetadata the annotation metadata of the configuration class
	 * @return the auto-configurations that should be imported
	 */
	protected AutoConfigurationEntry getAutoConfigurationEntry(AnnotationMetadata annotationMetadata) {
		if (!isEnabled(annotationMetadata)) {
			return EMPTY_ENTRY;
		}
		AnnotationAttributes attributes = getAttributes(annotationMetadata);
		 // 从META-INF/spring.factories中获得候选的自动配置类
		List<String> configurations = getCandidateConfigurations(annotationMetadata, attributes);
		 // 排重
		configurations = removeDuplicates(configurations);
		 //根据EnableAutoConfiguration注解中属性，获取不需要自动装配的类名单
		Set<String> exclusions = getExclusions(annotationMetadata, attributes);
		 // 根据:@EnableAutoConfiguration.exclude
	   	 // @EnableAutoConfiguration.excludeName
 		 // spring.autoconfigure.exclude  进行排除
		checkExcludedClasses(configurations, exclusions);
		 // exclusions 也排除
		configurations.removeAll(exclusions);
		configurations = getConfigurationClassFilter().filter(configurations);
		// 这个方法是调用实现了AutoConfigurationImportListener的bean..  分别把候选的配置名单，和排除的配置名单传进去做扩展
		fireAutoConfigurationImportEvents(configurations, exclusions);
		return new AutoConfigurationEntry(configurations, exclusions);
	}