spring 注解AOP
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aspectAnnotation的切面信息,加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。
解析annotationServiceImpl的时候(此时AspectAnnotation还没有解析),resolveBeforeInstantiation方法里面shouldSkip方法里面,会去spring的容器找所有有Aspect注解的类,找到aspectAnnotation,然后把aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。
然后在doCreateBean方法里面的initializeBean方法里面的applyBeanPostProcessorsAfterInitialization方法里面,返回jdk的动态代理:org.springframework.aop.framework.JdkDynamicAopProxy@5933aa7e,代理的 h = jdk动态代理,代理的ProxyFactory里面有AnnotationServiceImpl和切面[public void arounddd(ProceedingJoinPoint) , public void beforeee(JoinPoint), public void afterrr(JoinPoint), public void pc1()],
<aop:aspectj-autoproxy/> 有这个标签才支持注解。
@Service //首先要是一个bean,然后再是反射拿到Aspect注解。 @Aspect public class AspectAnnotation {//注解针对的是spring所有的bean。只要满足注解条件。 @Pointcut("execution(public * com.zhuguang.jack.annotation.*.*(..))") //拦截的方法:com.zhuguang.jack.service.*.* 包下的任意方法。 //(一个类的接口在这个包下面,实现类不在这个包下面,也属于条件符合) //(实现类在这个包下面,接口不在这个包下面,也属于符合条件) public void pc1(){} @Before("pc1()") public void beforeee(JoinPoint joinPoint) { System.out.println("==============beforeee 前置通知========="); } @After("pc1()") public void afterrr(JoinPoint joinPoint) { System.out.println("==============afterrr 后置通知========="); } @Around("pc1()") public void arounddd(ProceedingJoinPoint joinPoint) throws Throwable { System.out.println("==============arounddd 前置通知========="); joinPoint.proceed(); System.out.println("==============arounddd 后置通知========="); } }
public interface MyService { public String doSomething(String param); public String throwTest(String param); }
@Service("annotationServiceImpl") public class AnnotationServiceImpl { public String doSomething(String param) { System.out.println("==========AnnotationServiceImpl.doSomething========="); } }
public class Test2 { public static void main(String[] args) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath*:config" + "/spring/applicationContext-core2.xml"); AnnotationServiceImpl as = (AnnotationServiceImpl) context.getBean("annotationServiceImpl"); as.doSomething("Jack"); //aop起作用 } }
==============arounddd 前置通知=========
==============beforeee 前置通知=========
==========AnnotationServiceImpl.doSomething=========
==============arounddd 后置通知=========
==============afterrr 后置通知=========
applicationContext-core2.xml (只有一个扫描,和开启aop注解)
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:util="http://www.springframework.org/schema/util" xmlns:cache="http://www.springframework.org/schema/cache" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd" default-lazy-init="true"> <context:component-scan base-package="com.zhuguang.jack" use-default-filters="true" annotation-config="true"> </context:component-scan> <aop:aspectj-autoproxy/> </beans>
解析<aop:aspectj-autoproxy/>标签: public class AopNamespaceHandler extends NamespaceHandlerSupport { @Override public void init() { registerBeanDefinitionParser("aspectj-autoproxy", new AspectJAutoProxyBeanDefinitionParser()); } }
public BeanDefinition parse(Element element, ParserContext parserContext) { //element = [aop:aspectj-autoproxy: null], AopNamespaceUtils.registerAspectJAnnotationAutoProxyCreatorIfNecessary(parserContext, element); //注册入口类,AnnotationAwareAspectJAutoProxyCreator.class,放到spring的容器。 extendBeanDefinition(element, parserContext); return null; }
xml配置aop的时候,还要解析aspect,pointcut,advisor,before,after,after-returning,around然后解析成beanDefinition加到spring的容器中去。
注解版的,只需要把<aop:aspectj-autoproxy/>标签解析成AnnotationAwareAspectJAutoProxyCreator的beanDefinition然后加到容器中去就可以了。
aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。
ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory(); //解析apploication-core.xml文件,现在总共加了7个beandefiniton到spring的容器中,把xml文件里面的bean还有spring自己的bean都加到spring的容器中去了。
protected final void refreshBeanFactory() throws BeansException { try { DefaultListableBeanFactory beanFactory = createBeanFactory(); beanFactory.setSerializationId(getId()); customizeBeanFactory(beanFactory); loadBeanDefinitions(beanFactory); synchronized (this.beanFactoryMonitor) { this.beanFactory = beanFactory; }
public int loadBeanDefinitions(String location, Set<Resource> actualResources) throws BeanDefinitionStoreException { ResourceLoader resourceLoader = getResourceLoader(); //ClassPathXmlApplicationContext@399c4be1, if (resourceLoader instanceof ResourcePatternResolver) { try { Resource[] resources = ((ResourcePatternResolver) resourceLoader).getResources(location); int loadCount = loadBeanDefinitions(resources); //resources = spring-source-web-master/target/classes/config/spring/applicationContext-core2.xml,
public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException { try { InputStream inputStream = encodedResource.getResource().getInputStream(); //spring-source-web-master\\spring-source-web-master\\target\\classes\\config\\spring\\applicationContext-core2.xml try { InputSource inputSource = new InputSource(inputStream); if (encodedResource.getEncoding() != null) { inputSource.setEncoding(encodedResource.getEncoding()); } return doLoadBeanDefinitions(inputSource, encodedResource.getResource()); } finally { inputStream.close(); }
protected int doLoadBeanDefinitions(InputSource inputSource, Resource resource) throws BeanDefinitionStoreException { try { Document doc = doLoadDocument(inputSource, resource); //spring-source-web-master/spring-source-web-master/target/classes/config/spring/applicationContext-core2.xml doc = [context:component-scan: null], [aop:aspectj-autoproxy: null]] return registerBeanDefinitions(doc, resource); }
public Document loadDocument(InputSource inputSource, EntityResolver entityResolver, ErrorHandler errorHandler, int validationMode, boolean namespaceAware) throws Exception { DocumentBuilderFactory factory = createDocumentBuilderFactory(validationMode, namespaceAware); //DocumentBuilderFactoryImpl DocumentBuilder builder = createDocumentBuilder(factory, entityResolver, errorHandler); //DocumentBuilderImpl return builder.parse(inputSource); //spring-source-web-master\\target\\classes\\config\\spring\\applicationContext-core2.xml }
public int registerBeanDefinitions(Document doc, Resource resource) throws BeanDefinitionStoreException { BeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader(); //DefaultBeanDefinitionDocumentReader documentReader.registerBeanDefinitions(doc, createReaderContext(resource)); }
protected void doRegisterBeanDefinitions(Element root) { preProcessXml(root); parseBeanDefinitions(root, this.delegate); //root = applicationCore.xml的根<beans>标签, postProcessXml(root); }
protected void parseBeanDefinitions(Element root, BeanDefinitionParserDelegate delegate) { if (delegate.isDefaultNamespace(root)) { NodeList nl = root.getChildNodes(); //便利applicationCore.xml的根节点的所有子节点, for (int i = 0; i < nl.getLength(); i++) { Node node = nl.item(i); if (node instanceof Element) { Element ele = (Element) node; if (delegate.isDefaultNamespace(ele)) { parseDefaultElement(ele, delegate); } else { delegate.parseCustomElement(ele); //解析自定义的context:component-scan标签,aop:aspectj-autoproxy标签, } } } } }
//解析自定义的context:component-scan标签 public BeanDefinition parseCustomElement(Element ele, BeanDefinition containingBd) { String namespaceUri = getNamespaceURI(ele); //http://www.springframework.org/schema/context, NamespaceHandler handler = this.readerContext.getNamespaceHandlerResolver().resolve(namespaceUri); return handler.parse(ele, new ParserContext(this.readerContext, this, containingBd)); //handler = ContextNamespaceHandler,ele = context:component-scan, }
public NamespaceHandler resolve(String namespaceUri) { else { String className = (String) handlerOrClassName; try { Class<?> handlerClass = ClassUtils.forName(className, this.classLoader); NamespaceHandler namespaceHandler = (NamespaceHandler) BeanUtils.instantiateClass(handlerClass); //ContextNamespaceHandler,是一个NamespaceHandler namespaceHandler.init(); handlerMappings.put(namespaceUri, namespaceHandler); return namespaceHandler; } } }
public class ContextNamespaceHandler extends NamespaceHandlerSupport { @Override public void init() { registerBeanDefinitionParser("component-scan", new ComponentScanBeanDefinitionParser()); //解析context:component-sca标签的类加到ContextNamespaceHandler 进去 } }
public BeanDefinition parse(Element element, ParserContext parserContext) { return findParserForElement(element, parserContext).parse(element, parserContext); //根据element = context:component-scan找到这个标签对应的解析类ComponentScanBeanDefinitionParser, }
public BeanDefinition parse(Element element, ParserContext parserContext) { String[] basePackages = StringUtils.tokenizeToStringArray(element.getAttribute(BASE_PACKAGE_ATTRIBUTE), ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS); //[com.zhuguang.jack] // Actually scan for bean definitions and register them. ClassPathBeanDefinitionScanner scanner = configureScanner(parserContext, element); //ClassPathBeanDefinitionScanner Set<BeanDefinitionHolder> beanDefinitions = scanner.doScan(basePackages); //aspectAnnotation,annotationServiceImpl这2个bean的定义,加到spring容器中去, registerComponents(parserContext.getReaderContext(), beanDefinitions, element); return null; }
protected Set<BeanDefinitionHolder> doScan(String... basePackages) { Assert.notEmpty(basePackages, "At least one base package must be specified"); Set<BeanDefinitionHolder> beanDefinitions = new LinkedHashSet<BeanDefinitionHolder>(); for (String basePackage : basePackages) { Set<BeanDefinition> candidates = findCandidateComponents(basePackage); //这个包下面只有2个类要解析,[class [AnnotationServiceImpl];spring-source-web-master\\target\\classes\\com\\zhuguang\\jack\\annotation\\AnnotationServiceImpl.class], [AspectAnnotation];spring-source-web-master\\target\\classes\\com\\zhuguang\\jack\\annotation\\AspectAnnotation.class]] for (BeanDefinition candidate : candidates) { ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(candidate); candidate.setScope(scopeMetadata.getScopeName()); String beanName = this.beanNameGenerator.generateBeanName(candidate, this.registry); if (checkCandidate(beanName, candidate)) { BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(candidate, beanName); definitionHolder = AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry); beanDefinitions.add(definitionHolder); registerBeanDefinition(definitionHolder, this.registry); //aspectAnnotation,annotationServiceImpl这2个bean的定义,加到spring容器中去, } } } return beanDefinitions; }
protected void registerComponents( XmlReaderContext readerContext, Set<BeanDefinitionHolder> beanDefinitions, Element element) { if (annotationConfig) { Set<BeanDefinitionHolder> processorDefinitions = AnnotationConfigUtils.registerAnnotationConfigProcessors(readerContext.getRegistry(), source); //加了4个bean到spring的容器[CommonAnnotationBeanPostProcessor]; [ConfigurationClassPostProcessor]; [RequiredAnnotationBeanPostProcessor]; [AutowiredAnnotationBeanPostProcessor]; 是注解配置的处理器。 for (BeanDefinitionHolder processorDefinition : processorDefinitions) { compositeDef.addNestedComponent(new BeanComponentDefinition(processorDefinition)); } } readerContext.fireComponentRegistered(compositeDef); }
解析aop:aspectj-autoproxy标签: public BeanDefinition parseCustomElement(Element ele, BeanDefinition containingBd) { String namespaceUri = getNamespaceURI(ele); //http://www.springframework.org/schema/aop NamespaceHandler handler = this.readerContext.getNamespaceHandlerResolver().resolve(namespaceUri); return handler.parse(ele, new ParserContext(this.readerContext, this, containingBd)); }
public NamespaceHandler resolve(String namespaceUri) { else { String className = (String) handlerOrClassName; try { Class<?> handlerClass = ClassUtils.forName(className, this.classLoader); NamespaceHandler namespaceHandler = (NamespaceHandler) BeanUtils.instantiateClass(handlerClass); //AopNamespaceHandler,是一个NamespaceHandler namespaceHandler.init(); handlerMappings.put(namespaceUri, namespaceHandler); return namespaceHandler; } } }
public BeanDefinition parse(Element element, ParserContext parserContext) { return findParserForElement(element, parserContext).parse(element, parserContext); //找到aop:aspectj-autoproxy对应的解析器AspectJAutoProxyBeanDefinitionParser, }
public BeanDefinition parse(Element element, ParserContext parserContext) { AopNamespaceUtils.registerAspectJAnnotationAutoProxyCreatorIfNecessary(parserContext, element); //AnnotationAwareAspectJAutoProxyCreator的bean定义加到spring的容器, extendBeanDefinition(element, parserContext); return null; }
现在总共加了7个beandefiniton到spring的容器中
CommonAnnotationBeanPostProcessor; ConfigurationClassPostProcessor; RequiredAnnotationBeanPostProcessor;AutowiredAnnotationBeanPostProcessor;(这4个是spring自己加的)。
AspectAnnotation;(component-scan出的自己写的类)
AnnotationServiceImpl;(component-scan出的自己写的类)
AnnotationAwareAspectJAutoProxyCreator;(<aop:aspectj-autoproxy/>标签对应的beanDefinition)
registerBeanPostProcessors(beanFactory);
实例化实现了BeanPostProcessor接口的6个bean:[internalAutowiredAnnotationProcessor, internalRequiredAnnotationProcessor, internalCommonAnnotationProcessor, internalAutoProxyCreator, ConfigurationClassPostProcessor.importAwareProcessor, ConfigurationClassPostProcessor.enhancedConfigurationProcessor]
finishBeanFactoryInitialization(beanFactory); beanFactory.preInstantiateSingletons();
//实例化9个bean,[annotationServiceImpl, aspectAnnotation, (没有解析成bean实例)。internalConfigurationAnnotationProcessor, internalAutowiredAnnotationProcessor, internalRequiredAnnotationProcessor, internalCommonAnnotationProcessor, internalAutoProxyCreator, ConfigurationClassPostProcessor.importAwareProcessor, ConfigurationClassPostProcessor.enhancedConfigurationProcessor(已经解析成实例了)。
解析annotationServiceImpl (里面有切面的类,先解析的这个类) protected Object createBean(final String beanName, final RootBeanDefinition mbd, final Object[] args) { try { Object bean = resolveBeforeInstantiation(beanName, mbd); //null。aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。 if (bean != null) { return bean; } } Object beanInstance = doCreateBean(beanName, mbd, args); return beanInstance;//返回jdk的动态代理,org.springframework.aop.framework.JdkDynamicAopProxy@5933aa7e,代理的h = jdk动态代理,代理的ProxyFactory里面有AnnotationServiceImpl和切面[public void arounddd(ProceedingJoinPoint) , public void beforeee(JoinPoint), public void afterrr(JoinPoint), public void pc1()], }
protected Object resolveBeforeInstantiation(String beanName, RootBeanDefinition mbd) { Object bean = null; if (!Boolean.FALSE.equals(mbd.beforeInstantiationResolved)) { // Make sure bean class is actually resolved at this point. if (mbd.hasBeanClass() && !mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) { bean = applyBeanPostProcessorsBeforeInstantiation(mbd.getBeanClass(), beanName); //null,aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。 if (bean != null) { bean = applyBeanPostProcessorsAfterInitialization(bean, beanName); } } mbd.beforeInstantiationResolved = (bean != null); } return bean; }
protected Object applyBeanPostProcessorsBeforeInstantiation(Class<?> beanClass, String beanName){ for (BeanPostProcessor bp : getBeanPostProcessors()) { if (bp instanceof InstantiationAwareBeanPostProcessor) { InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp; Object result = ibp.postProcessBeforeInstantiation(beanClass, beanName); //ConfigurationClassPostProcessor.enhancedConfigurationProcessor(没做什么事),CommonAnnotationBeanPostProcessor(没做什么事),AutowiredAnnotationBeanPostProcessor(没做什么事),RequiredAnnotationBeanPostProcessor(没做什么事),AnnotationAwareAspectJAutoProxyCreator(<aop:aspectj-autoproxy/>标签对应的beanDefinition),aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。 if (result != null) { return result; } } } return null; }
AnnotationAwareAspectJAutoProxyCreator(<aop:aspectj-autoproxy/>标签对应的beanDefinition)的postProcessBeforeInstantiation方法。 public Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) throws BeansException { if (isInfrastructureClass(beanClass) || shouldSkip(beanClass, beanName)) { //aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。 this.advisedBeans.put(cacheKey, Boolean.FALSE); return null; } if (beanName != null) { TargetSource targetSource = getCustomTargetSource(beanClass, beanName); //null就什么都不做。 if (targetSource != null) { this.targetSourcedBeans.add(beanName); Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(beanClass, beanName, targetSource); Object proxy = createProxy(beanClass, beanName, specificInterceptors, targetSource); this.proxyTypes.put(cacheKey, proxy.getClass()); return proxy; } } return null; }
protected boolean shouldSkip(Class<?> beanClass, String beanName) { List<Advisor> candidateAdvisors = findCandidateAdvisors(); //aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。 for (Advisor advisor : candidateAdvisors) { if (advisor instanceof AspectJPointcutAdvisor) { if (((AbstractAspectJAdvice) advisor.getAdvice()).getAspectName().equals(beanName)) { //一个都不是 return true; } } } return super.shouldSkip(beanClass, beanName); }
protected List<Advisor> findCandidateAdvisors() { List<Advisor> advisors = super.findCandidateAdvisors(); //null advisors.addAll(this.aspectJAdvisorsBuilder.buildAspectJAdvisors()); //this = AnnotationAwareAspectJAutoProxyCreator,aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。 return advisors; }
public List<Advisor> buildAspectJAdvisors() { //第二次从缓存advisorsCache中获取。 List<String> aspectNames = null; synchronized (this) { aspectNames = this.aspectBeanNames; if (aspectNames == null) { List<Advisor> advisors = new LinkedList<Advisor>(); aspectNames = new LinkedList<String>(); String[] beanNames = BeanFactoryUtils.beanNamesForTypeIncludingAncestors(this.beanFactory, Object.class, true, false); //拿到spring容器所有的Object.class,就是所有的bean, for (String beanName : beanNames) { if (this.advisorFactory.isAspect(beanType)) { //有没有Aspect注解,aspectAnnotation有这个注解, aspectNames.add(beanName); AspectMetadata amd = new AspectMetadata(beanType, beanName); if (amd.getAjType().getPerClause().getKind() == PerClauseKind.SINGLETON) { MetadataAwareAspectInstanceFactory factory = new BeanFactoryAspectInstanceFactory(this.beanFactory, beanName); List<Advisor> classAdvisors = this.advisorFactory.getAdvisors(factory); //拿到aspectAnnotation的所有切面, if (this.beanFactory.isSingleton(beanName)) { this.advisorsCache.put(beanName, classAdvisors); ////this = AnnotationAwareAspectJAutoProxyCreator,aspectAnnotation的切面信息,就加到了AnnotationAwareAspectJAutoProxyCreator的advisorsCache属性里面去了。 } advisors.addAll(classAdvisors); } } } this.aspectBeanNames = aspectNames; return advisors; // [expression [pc1()]; //advice method [public void arounddd(ProceedingJoinPoint) ]; expression [pc1()]; //advice method [public beforeee(JoinPoint)]; expression [pc1()]; //advice method [public void afterrr(JoinPoint)]; ] } } }
public static String[] beanNamesForTypeIncludingAncestors( ListableBeanFactory lbf, Class<?> type, boolean includeNonSingletons, boolean allowEagerInit) { String[] result = lbf.getBeanNamesForType(type, includeNonSingletons, allowEagerInit); //拿到spring容器所有的Object.class,就是所有的bean,lbf是bean工厂。 return result; }
public List<Advisor> getAdvisors(MetadataAwareAspectInstanceFactory maaif) { final Class<?> aspectClass = maaif.getAspectMetadata().getAspectClass(); //class com.zhuguang.jack.annotation.AspectAnnotation final String aspectName = maaif.getAspectMetadata().getAspectName(); //aspectAnnotation final List<Advisor> advisors = new LinkedList<Advisor>(); for (Method method : getAdvisorMethods(aspectClass)) { //[public void arounddd(ProceedingJoinPoint) , public void beforeee(JoinPoint), public void afterrr(JoinPoint), public void pc1()], Advisor advisor = getAdvisor(method, lazySingletonAspectInstanceFactory, advisors.size(), aspectName); if (advisor != null) { advisors.add(advisor); } } return advisors; // [expression [pc1()]; advice method [public void arounddd(ProceedingJoinPoint) ]; expression [pc1()]; advice method [public beforeee(JoinPoint)]; expression [pc1()]; advice method [public void afterrr(JoinPoint)]; ] }
private List<Method> getAdvisorMethods(Class<?> aspectClass) { final List<Method> methods = new LinkedList<Method>(); ReflectionUtils.doWithMethods(aspectClass, new ReflectionUtils.MethodCallback() { @Override public void doWith(Method method) throws IllegalArgumentException { // 没有@Pointcut注解的方法,加进去,@Pointcut不要,只处理@before,@after,@around。 if (AnnotationUtils.getAnnotation(method, Pointcut.class) == null) { methods.add(method); } } }); Collections.sort(methods, METHOD_COMPARATOR); return methods; //拿到所有的方法 //[public void arounddd(ProceedingJoinPoint) , public void beforeee(JoinPoint), public void afterrr(JoinPoint), public void pc1()],包括父类的方法。 }
public static void doWithMethods(Class<?>Spring-AOP注解开发