/**
 * Parses the  tag.
 */
class AnnotationDrivenBeanDefinitionParser implements BeanDefinitionParser {
    
    private static class AopAutoProxyConfigurer {
    
        public static void configureAutoProxyCreator(Element element, ParserContext parserContext) {
            // 解析proxy-target-class，是否採用CGLIB proxy
            AopNamespaceUtils.registerAutoProxyCreatorIfNecessary(parserContext, element);
            
            if (!parserContext.getRegistry().containsBeanDefinition(txAdvisorBeanName)) {
            	// Create the TransactionAttributeSource definition.
            	RootBeanDefinition sourceDef = new RootBeanDefinition("org.springframework.transaction.annotation.AnnotationTransactionAttributeSource");
            	String sourceName = parserContext.getReaderContext().registerWithGeneratedName(sourceDef);
            
            	// Create the TransactionInterceptor definition.
            	RootBeanDefinition interceptorDef = new RootBeanDefinition(TransactionInterceptor.class);
            	// 配置 interceptor.transactionManagerBeanName
            	registerTransactionManager(element, interceptorDef);
            	interceptorDef.getPropertyValues().add("transactionAttributeSource", new RuntimeBeanReference(sourceName));
            	String interceptorName = parserContext.getReaderContext().registerWithGeneratedName(interceptorDef);
            
            	// core! Create the TransactionAttributeSourceAdvisor definition.
            	RootBeanDefinition advisorDef = new RootBeanDefinition(BeanFactoryTransactionAttributeSourceAdvisor.class);
            	advisorDef.getPropertyValues().add("transactionAttributeSource", new RuntimeBeanReference(sourceName));
            	advisorDef.getPropertyValues().add("adviceBeanName", interceptorName);
            	parserContext.getRegistry().registerBeanDefinition(txAdvisorBeanName, advisorDef);
            }
        }
    }
}