TxNamespaceHandler @Override public void init() { registerBeanDefinitionParser("advice", new TxAdviceBeanDefinitionParser()); registerBeanDefinitionParser("annotation-driven", new AnnotationDrivenBeanDefinitionParser()); registerBeanDefinitionParser("jta-transaction-manager", new JtaTransactionManagerBeanDefinitionParser()); }
TxAdviceBeanDefinitionParser继承AbstractBeanDefinitionParser @Override public final BeanDefinition parse(Element element, ParserContext parserContext) { AbstractBeanDefinition definition = parseInternal(element, parserContext); if (definition != null && !parserContext.isNested()) { try { String id = resolveId(element, definition, parserContext); if (!StringUtils.hasText(id)) { parserContext.getReaderContext().error( "Id is required for element '" + parserContext.getDelegate().getLocalName(element) + "' when used as a top-level tag", element); } String[] aliases = new String[0]; String name = element.getAttribute(NAME_ATTRIBUTE); if (StringUtils.hasLength(name)) { aliases = StringUtils.trimArrayElements(StringUtils.commaDelimitedListToStringArray(name)); } BeanDefinitionHolder holder = new BeanDefinitionHolder(definition, id, aliases); registerBeanDefinition(holder, parserContext.getRegistry()); if (shouldFireEvents()) { BeanComponentDefinition componentDefinition = new BeanComponentDefinition(holder); postProcessComponentDefinition(componentDefinition); parserContext.registerComponent(componentDefinition); } } catch (BeanDefinitionStoreException ex) { parserContext.getReaderContext().error(ex.getMessage(), element); return null; } } return definition; }
AbstractSingleBeanDefinitionParser @Override protected final AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) { BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(); String parentName = getParentName(element); if (parentName != null) { builder.getRawBeanDefinition().setParentName(parentName); } Class<?> beanClass = getBeanClass(element); if (beanClass != null) { builder.getRawBeanDefinition().setBeanClass(beanClass); } else { String beanClassName = getBeanClassName(element); if (beanClassName != null) { builder.getRawBeanDefinition().setBeanClassName(beanClassName); } } builder.getRawBeanDefinition().setSource(parserContext.extractSource(element)); if (parserContext.isNested()) { // Inner bean definition must receive same scope as containing bean. builder.setScope(parserContext.getContainingBeanDefinition().getScope()); } if (parserContext.isDefaultLazyInit()) { // Default-lazy-init applies to custom bean definitions as well. builder.setLazyInit(true); } doParse(element, parserContext, builder); return builder.getBeanDefinition(); }
TxAdviceBeanDefinitionParser @Override protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) { builder.addPropertyReference("transactionManager", TxNamespaceHandler.getTransactionManagerName(element)); List<Element> txAttributes = DomUtils.getChildElementsByTagName(element, ATTRIBUTES_ELEMENT); if (txAttributes.size() > 1) { parserContext.getReaderContext().error( "Element <attributes> is allowed at most once inside element <advice>", element); } else if (txAttributes.size() == 1) { // Using attributes source. Element attributeSourceElement = txAttributes.get(0); RootBeanDefinition attributeSourceDefinition = parseAttributeSource(attributeSourceElement, parserContext); builder.addPropertyValue("transactionAttributeSource", attributeSourceDefinition); } else { // Assume annotations source. builder.addPropertyValue("transactionAttributeSource", new RootBeanDefinition("org.springframework.transaction.annotation.AnnotationTransactionAttributeSource")); } } protected Class<?> getBeanClass(Element element) { return TransactionInterceptor.class; }