Spring源码分析，ConfigurationClassPostProcessor

落日映苍穹つ 2022-10-14 00:55 160阅读 0赞

接着上一篇[bean的BeanPostProcessor和BeanFactoryPostProcessor的][bean_BeanPostProcessor_BeanFactoryPostProcessor] 分析

// Detect any custom bean name generation strategy supplied through the enclosing application context
    		SingletonBeanRegistry sbr = null;
    		//如果BeanDefinitionRegistry是SingletonBeanRegistry子类的话,
    		// 由于我们当前传入的是DefaultListableBeanFactory,是SingletonBeanRegistry 的子类
    		// 因此会将registry强转为SingletonBeanRegistry
    		if (registry instanceof SingletonBeanRegistry) {
    			sbr = (SingletonBeanRegistry) registry;
    			if (!this.localBeanNameGeneratorSet) {//是否有自定义的
    				BeanNameGenerator generator = (BeanNameGenerator) sbr.getSingleton(CONFIGURATION_BEAN_NAME_GENERATOR);
    				//SingletonBeanRegistry中有id为 org.springframework.context.annotation.internalConfigurationBeanNameGenerator
    				//如果有则利用他的，否则则是spring默认的
    				if (generator != null) {
    					this.componentScanBeanNameGenerator = generator;
    					this.importBeanNameGenerator = generator;
    				}
    			}
    		}

接着往下分析:接下来实例化了一个ConfigurationClassParser 为了解析各个配置类

ConfigurationClassParser parser = new ConfigurationClassParser(
    				this.metadataReaderFactory, this.problemReporter, this.environment,
    				this.resourceLoader, this.componentScanBeanNameGenerator, registry);
    
    		//实例化2个set,candidates用于将之前加入的configCandidates进行去重
    		//因为可能有多个配置类重复了
    		//alreadyParsed用于判断是否处理过
    		Set<BeanDefinitionHolder> candidates = new LinkedHashSet<>(configCandidates);
    		Set<ConfigurationClass> alreadyParsed = new HashSet<>(configCandidates.size());

下面来看一个很重要的方法

Set<BeanDefinitionHolder> candidates = new LinkedHashSet<>(configCandidates);
    parser.parse(candidates);

public void parse(Set<BeanDefinitionHolder> configCandidates) {
    		this.deferredImportSelectors = new LinkedList<>();
    		//根据BeanDefinition 的类型 做不同的处理,一般都会调用ConfigurationClassParser#parse 进行解析
    		for (BeanDefinitionHolder holder : configCandidates) {
    			BeanDefinition bd = holder.getBeanDefinition();
    			//
    			try {
    				if (bd instanceof AnnotatedBeanDefinition) {
    					//解析注解对象，并且把解析出来的bd放到map，但是这里的bd指的是普通的
    					//何谓不普通的呢？比如@Bean 和各种beanFactoryPostProcessor得到的bean不在这里put
    					//但是是这里解析，只是不put而已
    					parse(((AnnotatedBeanDefinition) bd).getMetadata(), holder.getBeanName());
    				}
    				else if (bd instanceof AbstractBeanDefinition && ((AbstractBeanDefinition) bd).hasBeanClass()) {
    					parse(((AbstractBeanDefinition) bd).getBeanClass(), holder.getBeanName());
    				}
    				else {
    					parse(bd.getBeanClassName(), holder.getBeanName());
    				}
    			}
    			catch (BeanDefinitionStoreException ex) {
    				throw ex;
    			}
    			catch (Throwable ex) {
    				throw new BeanDefinitionStoreException(
    						"Failed to parse configuration class [" + bd.getBeanClassName() + "]", ex);
    			}
    		}
    
    		//处理延迟加载的importSelect？为什么要延迟加载，估计就是为了延迟吧
    		processDeferredImportSelectors();
    	}

我们的appconfig会进这两个分支，原因代码注释上有

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L29sZHNoYXVp_size_16_color_FFFFFF_t_70][]

进入这个parse方法，看看做了一些什么事情

protected void processConfigurationClass(ConfigurationClass configClass) throws IOException {
    		if (this.conditionEvaluator.shouldSkip(configClass.getMetadata(), ConfigurationPhase.PARSE_CONFIGURATION)) {
    			return;
    		}
    
    		// 处理Imported 的情况
    		//就是当前这个注解类有没有被别的类import
    		ConfigurationClass existingClass = this.configurationClasses.get(configClass);
    		if (existingClass != null) {
    			if (configClass.isImported()) {
    				if (existingClass.isImported()) {
    					existingClass.mergeImportedBy(configClass);
    				}
    				// Otherwise ignore new imported config class; existing non-imported class overrides it.
    				return;
    			}
    			else {
    				// Explicit bean definition found, probably replacing an imports.
    				// Let's remove the old one and go with the new one.
    				this.configurationClasses.remove(configClass);
    				this.knownSuperclasses.values().removeIf(configClass::equals);
    			}
    		}
    
    		// Recursively process the configuration class and its superclass hierarchy.
    		SourceClass sourceClass = asSourceClass(configClass);
    		do {
    			sourceClass = doProcessConfigurationClass(configClass, sourceClass);
    		}
    		while (sourceClass != null);
    		//一个map，用来存放扫描出来的bean（注意这里的bean不是对象，仅仅bean的信息，因为还没到实例化这一步）
    		this.configurationClasses.put(configClass, configClass);
    	}

这里面面最重要的一个方法就是

sourceClass = doProcessConfigurationClass(configClass, sourceClass);

protected final SourceClass doProcessConfigurationClass(ConfigurationClass configClass, SourceClass sourceClass)
    			throws IOException {
    
    		// Recursively process any member (nested) classes first
    		//处理内部类
    		processMemberClasses(configClass, sourceClass);
    
    		// Process any @PropertySource annotations
    		for (AnnotationAttributes propertySource : AnnotationConfigUtils.attributesForRepeatable(
    				sourceClass.getMetadata(), PropertySources.class,
    				org.springframework.context.annotation.PropertySource.class)) {
    			if (this.environment instanceof ConfigurableEnvironment) {
    				processPropertySource(propertySource);
    			}
    			else {
    				logger.warn("Ignoring @PropertySource annotation on [" + sourceClass.getMetadata().getClassName() +
    						"]. Reason: Environment must implement ConfigurableEnvironment");
    			}
    		}
    
    		// Process any @ComponentScan annotations
    		Set<AnnotationAttributes> componentScans = AnnotationConfigUtils.attributesForRepeatable(
    				sourceClass.getMetadata(), ComponentScans.class, ComponentScan.class);
    		if (!componentScans.isEmpty() &&
    				!this.conditionEvaluator.shouldSkip(sourceClass.getMetadata(), ConfigurationPhase.REGISTER_BEAN)) {
    			for (AnnotationAttributes componentScan : componentScans) {
    				// The config class is annotated with @ComponentScan -> perform the scan immediately
    				//扫描普通类=componentScan=com.luban
    				//这里扫描出来所有@@Component
    				//并且把扫描的出来的普通bean放到map当中
    				Set<BeanDefinitionHolder> scannedBeanDefinitions =
    						this.componentScanParser.parse(componentScan, sourceClass.getMetadata().getClassName());
    				// Check the set of scanned definitions for any further config classes and parse recursively if needed
    				//检查扫描出来的类当中是否还有configuration
    				for (BeanDefinitionHolder holder : scannedBeanDefinitions) {
    					BeanDefinition bdCand = holder.getBeanDefinition().getOriginatingBeanDefinition();
    					if (bdCand == null) {
    						bdCand = holder.getBeanDefinition();
    					}
    					//检查  todo
    					if (ConfigurationClassUtils.checkConfigurationClassCandidate(bdCand, this.metadataReaderFactory)) {
    						parse(bdCand.getBeanClassName(), holder.getBeanName());
    					}
    				}
    			}
    		}
    
    		/**
    		 * 上面的代码就是扫描普通类----@Component
    		 * 并且放到了map当中
    		 */
    		// Process any @Import annotations
    		//处理@Import  imports 3种情况
    		//ImportSelector
    		//普通类
    		//ImportBeanDefinitionRegistrar
    		//这里和内部地柜调用时候的情况不同
    		/**
    		 * 这里处理的import是需要判断我们的类当中时候有@Import注解
    		 * 如果有这把@Import当中的值拿出来，是一个类
    		 * 比如@Import(xxxxx.class)，那么这里便把xxxxx传进去进行解析
    		 * 在解析的过程中如果发觉是一个importSelector那么就回调selector的方法
    		 * 返回一个字符串（类名），通过这个字符串得到一个类
    		 * 继而在递归调用本方法来处理这个类
    		 *
    		 * 判断一组类是不是imports（3种import）
    		 *
    		 *
    		 */
    		processImports(configClass, sourceClass, getImports(sourceClass), true);
    
    		// Process any @ImportResource annotations
    		AnnotationAttributes importResource =
    				AnnotationConfigUtils.attributesFor(sourceClass.getMetadata(), ImportResource.class);
    		if (importResource != null) {
    			String[] resources = importResource.getStringArray("locations");
    			Class<? extends BeanDefinitionReader> readerClass = importResource.getClass("reader");
    			for (String resource : resources) {
    				String resolvedResource = this.environment.resolveRequiredPlaceholders(resource);
    				configClass.addImportedResource(resolvedResource, readerClass);
    			}
    		}
    
    		// Process individual @Bean methods
    		Set<MethodMetadata> beanMethods = retrieveBeanMethodMetadata(sourceClass);
    		for (MethodMetadata methodMetadata : beanMethods) {
    			configClass.addBeanMethod(new BeanMethod(methodMetadata, configClass));
    		}
    
    		// Process default methods on interfaces
    
    		processInterfaces(configClass, sourceClass);
    
    		// Process superclass, if any
    		if (sourceClass.getMetadata().hasSuperClass()) {
    			String superclass = sourceClass.getMetadata().getSuperClassName();
    			if (superclass != null && !superclass.startsWith("java") &&
    					!this.knownSuperclasses.containsKey(superclass)) {
    				this.knownSuperclasses.put(superclass, configClass);
    				// Superclass found, return its annotation metadata and recurse
    				return sourceClass.getSuperClass();
    			}
    		}
    
    		// No superclass -> processing is complete
    		return null;
    	}

拿到我们的appconfig

![20210603193224224.png][]

先处理 @PropertySource（我对这个属性不熟悉，先不介绍这个，来介绍一些我们都熟悉的类）

Set<AnnotationAttributes> componentScans = AnnotationConfigUtils.attributesForRepeatable(
    				sourceClass.getMetadata(), ComponentScans.class, ComponentScan.class);

拿到我们配置类的@componentScans里面的内容：

![20210603193834239.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L29sZHNoYXVp_size_16_color_FFFFFF_t_70 1][]

因为这个@ComponentScan可以配多个，所以需要循环遍历处理

this.componentScanParser.parse(componentScan, sourceClass.getMetadata().getClassName());

public Set<BeanDefinitionHolder> parse(AnnotationAttributes componentScan, final String declaringClass) {
    		ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(this.registry,
    				componentScan.getBoolean("useDefaultFilters"), this.environment, this.resourceLoader);
    
    		Class<? extends BeanNameGenerator> generatorClass = componentScan.getClass("nameGenerator");
    		boolean useInheritedGenerator = (BeanNameGenerator.class == generatorClass);
    		scanner.setBeanNameGenerator(useInheritedGenerator ? this.beanNameGenerator :
    				BeanUtils.instantiateClass(generatorClass));
    
    		ScopedProxyMode scopedProxyMode = componentScan.getEnum("scopedProxy");
    		if (scopedProxyMode != ScopedProxyMode.DEFAULT) {
    			scanner.setScopedProxyMode(scopedProxyMode);
    		}
    		else {
    			Class<? extends ScopeMetadataResolver> resolverClass = componentScan.getClass("scopeResolver");
    			scanner.setScopeMetadataResolver(BeanUtils.instantiateClass(resolverClass));
    		}
    
    		scanner.setResourcePattern(componentScan.getString("resourcePattern"));
    
    		for (AnnotationAttributes filter : componentScan.getAnnotationArray("includeFilters")) {
    			for (TypeFilter typeFilter : typeFiltersFor(filter)) {
    				scanner.addIncludeFilter(typeFilter);
    			}
    		}
    		for (AnnotationAttributes filter : componentScan.getAnnotationArray("excludeFilters")) {
    			for (TypeFilter typeFilter : typeFiltersFor(filter)) {
    				scanner.addExcludeFilter(typeFilter);
    			}
    		}
    
    		boolean lazyInit = componentScan.getBoolean("lazyInit");
    		if (lazyInit) {
    			scanner.getBeanDefinitionDefaults().setLazyInit(true);
    		}
    
    		Set<String> basePackages = new LinkedHashSet<>();
    		String[] basePackagesArray = componentScan.getStringArray("basePackages");
    		for (String pkg : basePackagesArray) {
    			String[] tokenized = StringUtils.tokenizeToStringArray(this.environment.resolvePlaceholders(pkg),
    					ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
    			Collections.addAll(basePackages, tokenized);
    		}
    		for (Class<?> clazz : componentScan.getClassArray("basePackageClasses")) {
    			basePackages.add(ClassUtils.getPackageName(clazz));
    		}
    		if (basePackages.isEmpty()) {
    			basePackages.add(ClassUtils.getPackageName(declaringClass));
    		}
    
    		scanner.addExcludeFilter(new AbstractTypeHierarchyTraversingFilter(false, false) {
    			@Override
    			protected boolean matchClassName(String className) {
    				return declaringClass.equals(className);
    			}
    		});
    		return scanner.doScan(StringUtils.toStringArray(basePackages));
    	}

看这个方法的第一行

ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(this.registry,
    				componentScan.getBoolean("useDefaultFilters"), this.environment, this.resourceLoader);

所以我们第一篇博客中说的那个AnnotationConfigApplicationContext scanner是没有用的，只是方便程序员在外部调用的

![20210603194245254.png][]

这里我们能够清楚的看到，spring自己new了一个 ClassPathBeanDefinitionScanner

后面又在这个scanner设置了几个属性

比如：includeFilters  excludeFilters lazyInit等

然后又拿到我们需要扫描的包

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L29sZHNoYXVp_size_16_color_FFFFFF_t_70 2][]

开始执行扫描:

scanner.doScan(StringUtils.toStringArray(basePackages));

/**
    	 * 类路径 Bean 定义扫描器扫描给定包及其子包
    	 * @param basePackages
    	 * @return
    	 */
    	protected Set<BeanDefinitionHolder> doScan(String... basePackages) {
    		Assert.notEmpty(basePackages, "At least one base package must be specified");
    		// 创建一个集合，存放扫描到Bean定义的封装类
    		Set<BeanDefinitionHolder> beanDefinitions = new LinkedHashSet<>();
    		// 遍历扫描所有给定的包及其子包
    		for (String basePackage : basePackages) {
    			//调用父类 ClassPathScanningCandidateComponentProvider 的方法
    			//扫描给定类路径，获取符合条件的 Bean 定义
    			Set<BeanDefinition> candidates = findCandidateComponents(basePackage);
    			//遍历扫描到的 Bean
    			for (BeanDefinition candidate : candidates) {
    				//获取 Bean 定义类中@Scope 注解的值，即获取 Bean 的作用域
    				ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(candidate);
    				candidate.setScope(scopeMetadata.getScopeName());
    				//为 Bean 生成名称
    				String beanName = this.beanNameGenerator.generateBeanName(candidate, this.registry);
    				//如果扫描到的 Bean 不是 Spring 的注解 Bean，则为 Bean 设置默认值，
    				//设置 Bean 的自动依赖注入装配属性等
    				if (candidate instanceof AbstractBeanDefinition) {
    					postProcessBeanDefinition((AbstractBeanDefinition) candidate, beanName);
    				}
    				//如果扫描到的 Bean 是 Spring 的注解 Bean，则处理其通用的 Spring 注解
    				if (candidate instanceof AnnotatedBeanDefinition) {
    					//处理注解 Bean 中通用的注解，在分析注解 Bean 定义类读取器时已经分析过
    					AnnotationConfigUtils.processCommonDefinitionAnnotations((AnnotatedBeanDefinition) candidate);
    				}
    				//根据 Bean 名称检查指定的 Bean 是否需要在容器中注册，或者在容器中冲突
    				if (checkCandidate(beanName, candidate)) {
    					BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(candidate, beanName);
    					//根据注解中配置的作用域，为 Bean 应用相应的代理模式
    					definitionHolder =
    							AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);
    					beanDefinitions.add(definitionHolder);
    					//向容器注册扫描到的 Bean
    					registerBeanDefinition(definitionHolder, this.registry);
    				}
    			}
    		}
    		return beanDefinitions;
    	}

//扫描给定类路径，获取符合条件的 Bean 定义
    			Set<BeanDefinition> candidates = findCandidateComponents(basePackage);

这个方法执行完成之后，就能把我们加了@compoent的类都扫描到，底层用的是ASM技术，我把这个方法贴上去，大家自行查看，我对asm也不了解

private Set<BeanDefinition> addCandidateComponentsFromIndex(CandidateComponentsIndex index, String basePackage) {
    		//创建存储扫描到的类的集合
    		Set<BeanDefinition> candidates = new LinkedHashSet<>();
    		try {
    			Set<String> types = new HashSet<>();
    			for (TypeFilter filter : this.includeFilters) {
    				String stereotype = extractStereotype(filter);
    				if (stereotype == null) {
    					throw new IllegalArgumentException("Failed to extract stereotype from " + filter);
    				}
    				types.addAll(index.getCandidateTypes(basePackage, stereotype));
    			}
    			boolean traceEnabled = logger.isTraceEnabled();
    			boolean debugEnabled = logger.isDebugEnabled();
    			for (String type : types) {
    				//为指定资源获取元数据读取器，元信息读取器通过汇编(ASM)读取资源元信息
    				MetadataReader metadataReader = getMetadataReaderFactory().getMetadataReader(type);
    				//如果扫描到的类符合容器配置的过滤规则
    				if (isCandidateComponent(metadataReader)) {
    					//通过汇编(ASM)读取资源字节码中的 Bean 定义元信息
    					ScannedGenericBeanDefinition sbd = new ScannedGenericBeanDefinition(metadataReader);
    					sbd.setSource(metadataReader.getResource());
    					if (isCandidateComponent(sbd)) {
    						if (debugEnabled) {
    							logger.debug("Using candidate component class from index: " + type);
    						}
    						candidates.add(sbd);
    					}
    					else {
    						if (debugEnabled) {
    							logger.debug("Ignored because not a concrete top-level class: " + type);
    						}
    					}
    				}
    				else {
    					if (traceEnabled) {
    						logger.trace("Ignored because matching an exclude filter: " + type);
    					}
    				}
    			}
    		}
    		catch (IOException ex) {
    			throw new BeanDefinitionStoreException("I/O failure during classpath scanning", ex);
    		}
    		return candidates;
    	}

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L29sZHNoYXVp_size_16_color_FFFFFF_t_70 3][]

然后遍历通过asm拿到的类，遍历,详细可以看我代码的注释，基本都可以看懂,我们来分析下这个代码

//设置 Bean 的自动依赖注入装配属性等
    				if (candidate instanceof AbstractBeanDefinition) {
    					postProcessBeanDefinition((AbstractBeanDefinition) candidate, beanName);
    				}
    				//如果扫描到的 Bean 是 Spring 的注解 Bean，则处理其通用的 Spring 注解
    				if (candidate instanceof AnnotatedBeanDefinition) {
    					//处理注解 Bean 中通用的注解，在分析注解 Bean 定义类读取器时已经分析过
    					AnnotationConfigUtils.processCommonDefinitionAnnotations((AnnotatedBeanDefinition) candidate);
    				}

先把默认值设置给bd

protected void postProcessBeanDefinition(AbstractBeanDefinition beanDefinition, String beanName) {
    		beanDefinition.applyDefaults(this.beanDefinitionDefaults);
    		if (this.autowireCandidatePatterns != null) {
    			beanDefinition.setAutowireCandidate(PatternMatchUtils.simpleMatch(this.autowireCandidatePatterns, beanName));
    		}
    	}
    
    
    
    	public void applyDefaults(BeanDefinitionDefaults defaults) {
    		setLazyInit(defaults.isLazyInit());
    		setAutowireMode(defaults.getAutowireMode());
    		setDependencyCheck(defaults.getDependencyCheck());
    		setInitMethodName(defaults.getInitMethodName());
    		setEnforceInitMethod(false);
    		setDestroyMethodName(defaults.getDestroyMethodName());
    		setEnforceDestroyMethod(false);
    	}

为 AnnotatedBeanDefinition设置类上设置的属性比如lazy，Primary，DependsOn,Role,Description，类上没有设置，就用上一步设置的默认值

static void processCommonDefinitionAnnotations(AnnotatedBeanDefinition abd, AnnotatedTypeMetadata metadata) {
    		AnnotationAttributes lazy = attributesFor(metadata, Lazy.class);
    		//如果 Bean 定义中有@Lazy 注解，则将该 Bean 预实例化属性设置为@lazy 注解的值
    		if (lazy != null) {
    			abd.setLazyInit(lazy.getBoolean("value"));
    		}
    		else if (abd.getMetadata() != metadata) {
    			lazy = attributesFor(abd.getMetadata(), Lazy.class);
    			if (lazy != null) {
    				abd.setLazyInit(lazy.getBoolean("value"));
    			}
    		}
    		//如果 Bean 定义中有@Primary 注解，则为该 Bean 设置为 autowiring 自动依赖注入装配的首选对象
    		if (metadata.isAnnotated(Primary.class.getName())) {
    			abd.setPrimary(true);
    		}
    		// 如果 Bean 定义中有@ DependsOn 注解，则为该 Bean 设置所依赖的 Bean 名称
    		//容器将确保在实例化该 Bean 之前首先实例化所依赖的 Bean
    		AnnotationAttributes dependsOn = attributesFor(metadata, DependsOn.class);
    		if (dependsOn != null) {
    			abd.setDependsOn(dependsOn.getStringArray("value"));
    		}
    
    		if (abd instanceof AbstractBeanDefinition) {
    			AbstractBeanDefinition absBd = (AbstractBeanDefinition) abd;
    			AnnotationAttributes role = attributesFor(metadata, Role.class);
    			if (role != null) {
    				absBd.setRole(role.getNumber("value").intValue());
    			}
    			AnnotationAttributes description = attributesFor(metadata, Description.class);
    			if (description != null) {
    				absBd.setDescription(description.getString("value"));
    			}
    		}
    	}

然后为bean设置相应的代理模式

// 根据作用域为 Bean 应用引用的代理模式
    
    	static BeanDefinitionHolder applyScopedProxyMode(
    			ScopeMetadata metadata, BeanDefinitionHolder definition, BeanDefinitionRegistry registry) {
    
    		//获取注解 Bean 定义类中@Scope 注解的 proxyMode 属性值
    		ScopedProxyMode scopedProxyMode = metadata.getScopedProxyMode();
    		//如果配置的@Scope 注解的 proxyMode 属性值为 NO，则不应用代理模式
    		if (scopedProxyMode.equals(ScopedProxyMode.NO)) {
    			return definition;
    		}
    		//获取配置的@Scope 注解的 proxyMode 属性值，如果为 TARGET_CLASS//则返回 true，如果为 INTERFACES，则返回 fals
    		boolean proxyTargetClass = scopedProxyMode.equals(ScopedProxyMode.TARGET_CLASS);
    		// 为注册的Bean创建相应模式的代理对象
    		return ScopedProxyCreator.createScopedProxy(definition, registry, proxyTargetClass);
    	}

然后向容器注册扫描到的bean

/**
    	 * 将解析的 BeanDefinitionHold 注册到容器
    	 */
    	public static void registerBeanDefinition(
    			BeanDefinitionHolder definitionHolder, BeanDefinitionRegistry registry)
    			throws BeanDefinitionStoreException {
    
    		// Register bean definition under primary name.
    		// 获取解析的BeanDefinition的名称
    		String beanName = definitionHolder.getBeanName();
    		//像ioc容器中注册BeanDefinition
    		registry.registerBeanDefinition(beanName, definitionHolder.getBeanDefinition());
    
    		// Register aliases for bean name, if any.
    		// 如果BeanDefinition有别名。像容器注册其别名
    		String[] aliases = definitionHolder.getAliases();
    		if (aliases != null) {
    			for (String alias : aliases) {
    				registry.registerAlias(beanName, alias);
    			}
    		}
    	}

这个方法执行完毕以后：我们scan就扫描完成，也就是这个方法执行完成org.springframework.context.annotation.ComponentScanAnnotationParser\#parse

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L29sZHNoYXVp_size_16_color_FFFFFF_t_70 4][]

然后遍历扫描获得的三个bd

接下来处理@Import的情况 详情请看下篇博客分解

[bean_BeanPostProcessor_BeanFactoryPostProcessor]: https://blog.csdn.net/oldshaui/article/details/117426865
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[20210603193224224.png]: /images/20221014/d868c120b1ef47529d8bc70acde69501.png
[20210603193834239.png]: /images/20221014/0c591246c822402ca8ae8f3bd0a85079.png
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[20210603194245254.png]: /images/20221014/1aa709fbb3574906ba10a956c5f6d64d.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L29sZHNoYXVp_size_16_color_FFFFFF_t_70 3]: /images/20221014/d5d9b386435041e08d2516e824f31218.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L29sZHNoYXVp_size_16_color_FFFFFF_t_70 4]: /images/20221014/72f8b947d99a4591ac1c94ebf1c7c24f.png