RequestMappingHandler分析

获取BeanDefinition信息并注册

AbstractApplicationContext: refresh
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AbstractApplicationContext: invokeBeanFactoryPostProcessors
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PostProcessorRegistrationDelegate: invokeBeanDefinitionRegistryPostProcessors
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BeanDefinitionRegistryPostProcessor: postProcessBeanDefinitionRegistry
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ConfigurationClassPostProcessor：processConfigBeanDefinitions
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ConfigurationClassParser: parse
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ConfigurationClassParser: doProcessConfigurationClass
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ComponentScanAnnotationParser: parse
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ClassPathBeanDefinitionScanner: doScan

ConfigurationClassPostProcessor

public void processConfigBeanDefinitions(BeanDefinitionRegistry registry) {
    // Parse each @Configuration class
	ConfigurationClassParser parser = new ConfigurationClassParser(
			this.metadataReaderFactory, this.problemReporter, this.environment,
			this.resourceLoader, this.componentScanBeanNameGenerator, registry);

	Set<BeanDefinitionHolder> candidates = new LinkedHashSet<>(configCandidates);
	Set<ConfigurationClass> alreadyParsed = new HashSet<>(configCandidates.size());
	do {
		parser.parse(candidates);
		parser.validate();
        ...
        // parser.getConfigurationClasses()中含有@Configuration的WebMvcAutoConfiguration
		Set<ConfigurationClass> configClasses = new LinkedHashSet<>(parser.getConfigurationClasses());
		configClasses.removeAll(alreadyParsed);

        ...
		if (registry.getBeanDefinitionCount() > candidateNames.length) {
		
		    // registry.getBeanDefinitionNames()中含有@Bean的requestMappingHandlerMapping和requestMappingHandlerAdapter
		    // 仅仅获取的是名称
			String[] newCandidateNames = registry.getBeanDefinitionNames();
			
			Set<String> oldCandidateNames = new HashSet<>(Arrays.asList(candidateNames));
			Set<String> alreadyParsedClasses = new HashSet<>();
			for (ConfigurationClass configurationClass : alreadyParsed) {
				alreadyParsedClasses.add(configurationClass.getMetadata().getClassName());
			}
			for (String candidateName : newCandidateNames) {
				if (!oldCandidateNames.contains(candidateName)) {
					BeanDefinition bd = registry.getBeanDefinition(candidateName);
					if (ConfigurationClassUtils.checkConfigurationClassCandidate(bd, this.metadataReaderFactory) &&
							!alreadyParsedClasses.contains(bd.getBeanClassName())) {
						candidates.add(new BeanDefinitionHolder(bd, candidateName));
					}
				}
			}
			candidateNames = newCandidateNames;
		}
	}
	while (!candidates.isEmpty());

}

实例化Bean

AbstractApplicationContext: refresh
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AbstractApplicationContext: finishBeanFactoryInitialization
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DefaultListableBeanFactory: preInstantiateSingletons
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AbstractBeanFactory: getBean
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AbstractBeanFactory: doGetBean
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AbstractBeanFactory: getSingleton
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AbstractBeanFactory: getObject
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AbstractAutowireCapableBeanFactory: createBean
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AbstractAutowireCapableBeanFactory: doCreateBean
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AbstractAutowireCapableBeanFactory: initializeBean
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AbstractAutowireCapableBeanFactory: invokeInitMethods
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RequestMappingHandlerMapping: afterPropertiesSet
RequestMappingHandlerAdapter: afterPropertiesSet

RequestMappingHandlerAdapter

public void afterPropertiesSet() {

    // 初始化Controller通用切面
    initControllerAdviceCache();

    // 初始化参数解析器
    if (this.argumentResolvers == null) {
        List<HandlerMethodArgumentResolver> resolvers = getDefaultArgumentResolvers();
        this.argumentResolvers = new HandlerMethodArgumentResolverComposite().addResolvers(resolvers);
    }
    // 初始化InitBinder解析器
    if (this.initBinderArgumentResolvers == null) {
        List<HandlerMethodArgumentResolver> resolvers = getDefaultInitBinderArgumentResolvers();
        this.initBinderArgumentResolvers = new HandlerMethodArgumentResolverComposite().addResolvers(resolvers);
    }
    // 初始化返回值处理器
    if (this.returnValueHandlers == null) {
        List<HandlerMethodReturnValueHandler> handlers = getDefaultReturnValueHandlers();
        this.returnValueHandlers = new HandlerMethodReturnValueHandlerComposite().addHandlers(handlers);
    }
}

RequestMappingHandlerMapping

@Override
public void afterPropertiesSet() {
	initHandlerMethods();
}

// Scan beans in the ApplicationContext, detect and register handler methods.
// 注册handler方法信息
protected void initHandlerMethods() {
	for (String beanName : getCandidateBeanNames()) {
		if (!beanName.startsWith(SCOPED_TARGET_NAME_PREFIX)) {
			processCandidateBean(beanName);
		}
	}
	handlerMethodsInitialized(getHandlerMethods());
}

最后

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