@Component
@Aspect
public class AopConfig {
    @Pointcut("execution(* com.garine.debug.testcase.model.AopObject..*(..))")
    public void mypoint(){
        //切面定義
    }
    @Before("mypoint()")
    public void doAround() throws Throwable {
        System.out.println("before logic");
    }
}

@Component
public class AopObject {
    public void aoped(){
        System.out.println("logic");
    }
}

protected void initBeanFactory(ConfigurableListableBeanFactory beanFactory) {
   super.initBeanFactory(beanFactory);
    //aspectJAdvisorsBuilder#buildAspectJAdvisors就是解析配置入口
   this.aspectJAdvisorsBuilder =
         new BeanFactoryAspectJAdvisorsBuilderAdapter(beanFactory, this.aspectJAdvisorFactory);
}

	@Override
	protected boolean shouldSkip(Class<?> beanClass, String beanName) {
		// TODO: Consider optimization by caching the list of the aspect names
        //預(yù)先解析緩存切面信息
		List<Advisor> candidateAdvisors = findCandidateAdvisors();
		for (Advisor advisor : candidateAdvisors) {
			if (advisor instanceof AspectJPointcutAdvisor) {
				if (((AbstractAspectJAdvice) advisor.getAdvice()).getAspectName().equals(beanName)) {
					return true;
				}
			}
		}
		return super.shouldSkip(beanClass, beanName);
	}

@Override
protected List<Advisor> findCandidateAdvisors() {
   // Add all the Spring advisors found according to superclass rules.
   List<Advisor> advisors = super.findCandidateAdvisors();
   // Build Advisors for all AspectJ aspects in the bean factory.
    //這里就是前面提到的BeanFactoryAspectJAdvisorsBuilder解析所有切面信息的調(diào)用點(diǎn)
   advisors.addAll(this.aspectJAdvisorsBuilder.buildAspectJAdvisors());
   return advisors;
}

public List<Advisor> buildAspectJAdvisors() {
   List<String> aspectNames = null;
   synchronized (this) {
      aspectNames = this.aspectBeanNames;
      if (aspectNames == null) {
         List<Advisor> advisors = new LinkedList<Advisor>();
         aspectNames = new LinkedList<String>();
          //查詢出Beanfactory中所有已經(jīng)注冊(cè)的BeanName
         String[] beanNames =
               BeanFactoryUtils.beanNamesForTypeIncludingAncestors(this.beanFactory, Object.class, true, false);
         for (String beanName : beanNames) {
            if (!isEligibleBean(beanName)) {
               continue;
            }
            // We must be careful not to instantiate beans eagerly as in this
            // case they would be cached by the Spring container but would not
            // have been weaved
            Class<?> beanType = this.beanFactory.getType(beanName);
            if (beanType == null) {
               continue;
            }
             //判斷Bean是否是切面Bean，isAspect方法判斷[標(biāo)注1]
            if (this.advisorFactory.isAspect(beanType)) {
               aspectNames.add(beanName);
               AspectMetadata amd = new AspectMetadata(beanType, beanName);
               if (amd.getAjType().getPerClause().getKind() == PerClauseKind.SINGLETON) {
                  MetadataAwareAspectInstanceFactory factory =
                        new BeanFactoryAspectInstanceFactory(this.beanFactory, beanName);
                   //解析aop class的配置，包返回Advisor對(duì)象[標(biāo)注2]
                  List<Advisor> classAdvisors = this.advisorFactory.getAdvisors(factory);
                  if (this.beanFactory.isSingleton(beanName)) {
                     this.advisorsCache.put(beanName, classAdvisors);
                  }
                  else {
                     this.aspectFactoryCache.put(beanName, factory);
                  }
                  advisors.addAll(classAdvisors);
               }
               else {
                  // Per target or per this.
                  if (this.beanFactory.isSingleton(beanName)) {
                     throw new IllegalArgumentException("Bean with name '" + beanName +
                           "' is a singleton, but aspect instantiation model is not singleton");
                  }
                  MetadataAwareAspectInstanceFactory factory =
                        new PrototypeAspectInstanceFactory(this.beanFactory, beanName);
                  this.aspectFactoryCache.put(beanName, factory);
                  advisors.addAll(this.advisorFactory.getAdvisors(factory));
               }
            }
         }
         this.aspectBeanNames = aspectNames;
         return advisors;
      }
   }
   if (aspectNames.isEmpty()) {
      return Collections.emptyList();
   }
   List<Advisor> advisors = new LinkedList<Advisor>();
   for (String aspectName : aspectNames) {
      List<Advisor> cachedAdvisors = this.advisorsCache.get(aspectName);
      if (cachedAdvisors != null) {
         advisors.addAll(cachedAdvisors);
      }
      else {
         MetadataAwareAspectInstanceFactory factory = this.aspectFactoryCache.get(aspectName);
         advisors.addAll(this.advisorFactory.getAdvisors(factory));
      }
   }
   return advisors;
}

@Override
public boolean isAspect(Class<?> clazz) {
   return (hasAspectAnnotation(clazz) && !compiledByAjc(clazz));
}
private boolean hasAspectAnnotation(Class<?> clazz) {
    //包含@Aspect注解
   return (AnnotationUtils.findAnnotation(clazz, Aspect.class) != null);
}

@Override
public Advisor getAdvisor(Method candidateAdviceMethod, MetadataAwareAspectInstanceFactory aspectInstanceFactory,
      int declarationOrderInAspect, String aspectName) {
   validate(aspectInstanceFactory.getAspectMetadata().getAspectClass());
   //解析判斷候選方法是否有@Before，@After，@Around等注解，如果有，就繼續(xù)執(zhí)行新建Advisor對(duì)象。
   AspectJExpressionPointcut expressionPointcut = getPointcut(
         candidateAdviceMethod, aspectInstanceFactory.getAspectMetadata().getAspectClass());
   if (expressionPointcut == null) {
      return null;
   }
//創(chuàng)建advisor
   return new InstantiationModelAwarePointcutAdvisorImpl(expressionPointcut, candidateAdviceMethod,
         this, aspectInstanceFactory, declarationOrderInAspect, aspectName);
}

protected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey) {
   if (beanName != null && this.targetSourcedBeans.contains(beanName)) {
      return bean;
   }
   if (Boolean.FALSE.equals(this.advisedBeans.get(cacheKey))) {
      return bean;
   }
   if (isInfrastructureClass(bean.getClass()) || shouldSkip(bean.getClass(), beanName)) {
      this.advisedBeans.put(cacheKey, Boolean.FALSE);
      return bean;
   }
   // Create proxy if we have advice.
    //查找匹配切面
   Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(bean.getClass(), beanName, null);
   if (specificInterceptors != DO_NOT_PROXY) {
      this.advisedBeans.put(cacheKey, Boolean.TRUE);
       //創(chuàng)建代理對(duì)象
      Object proxy = createProxy(
            bean.getClass(), beanName, specificInterceptors, new SingletonTargetSource(bean));
      this.proxyTypes.put(cacheKey, proxy.getClass());
      return proxy;
   }
   this.advisedBeans.put(cacheKey, Boolean.FALSE);
   return bean;
}

protected List<Advisor> findEligibleAdvisors(Class<?> beanClass, String beanName) {
    //從緩存取出所有切面信息
   List<Advisor> candidateAdvisors = findCandidateAdvisors();
    //根據(jù)advisor信息中的表達(dá)式進(jìn)行方法對(duì)class的匹配
   List<Advisor> eligibleAdvisors = findAdvisorsThatCanApply(candidateAdvisors, beanClass, beanName);
   extendAdvisors(eligibleAdvisors);
   if (!eligibleAdvisors.isEmpty()) {
      eligibleAdvisors = sortAdvisors(eligibleAdvisors);
   }
   return eligibleAdvisors;
}

private void checkReadyToMatch() {
   if (getExpression() == null) {
      throw new IllegalStateException("Must set property 'expression' before attempting to match");
   }
   if (this.pointcutExpression == null) {
      this.pointcutClassLoader = (this.beanFactory instanceof ConfigurableBeanFactory ?
            ((ConfigurableBeanFactory) this.beanFactory).getBeanClassLoader() :
            ClassUtils.getDefaultClassLoader());
       //解析得到攔截表達(dá)式，例如根據(jù)@Before的value來關(guān)聯(lián)查詢出對(duì)應(yīng)的表達(dá)式
      this.pointcutExpression = buildPointcutExpression(this.pointcutClassLoader);
   }
}

  // Create proxy if we have advice.
    //查找匹配切面
   Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(bean.getClass(), beanName, null);
   if (specificInterceptors != DO_NOT_PROXY) {
      this.advisedBeans.put(cacheKey, Boolean.TRUE);
       //創(chuàng)建代理對(duì)象  
      Object proxy = createProxy(
            bean.getClass(), beanName, specificInterceptors, new SingletonTargetSource(bean));
      this.proxyTypes.put(cacheKey, proxy.getClass());
      return proxy;
   }

protected Object createProxy(
      Class<?> beanClass, String beanName, Object[] specificInterceptors, TargetSource targetSource) {
   if (this.beanFactory instanceof ConfigurableListableBeanFactory) {
      AutoProxyUtils.exposeTargetClass((ConfigurableListableBeanFactory) this.beanFactory, beanName, beanClass);
   }
    //新建代理對(duì)象工廠
   ProxyFactory proxyFactory = new ProxyFactory();
   proxyFactory.copyFrom(this);
    //設(shè)置工廠代理類
   if (!proxyFactory.isProxyTargetClass()) {
      if (shouldProxyTargetClass(beanClass, beanName)) {
         proxyFactory.setProxyTargetClass(true);
      }
      else {
         evaluateProxyInterfaces(beanClass, proxyFactory);
      }
   }
    //設(shè)置攔截切面
   Advisor[] advisors = buildAdvisors(beanName, specificInterceptors);
   for (Advisor advisor : advisors) {
      proxyFactory.addAdvisor(advisor);
   }
    //設(shè)置被代理對(duì)象
   proxyFactory.setTargetSource(targetSource);
   customizeProxyFactory(proxyFactory);
   proxyFactory.setFrozen(this.freezeProxy);
   if (advisorsPreFiltered()) {
      proxyFactory.setPreFiltered(true);
   }
//創(chuàng)建代理對(duì)象
   return proxyFactory.getProxy(getProxyClassLoader());
}

public Object getProxy(ClassLoader classLoader) {
   return createAopProxy().getProxy(classLoader);
}

@Override
public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException {
	if (config.isOptimize() || config.isProxyTargetClass() || hasNoUserSuppliedProxyInterfaces(config)) {
		Class<?> targetClass = config.getTargetClass();
		if (targetClass == null) {
			throw new AopConfigException("TargetSource cannot determine target class: " +
					"Either an interface or a target is required for proxy creation.");
		}
		if (targetClass.isInterface() || Proxy.isProxyClass(targetClass)) {
            //采用jdk動(dòng)態(tài)代理必須基于接口
			return new JdkDynamicAopProxy(config);
		}
        //基于cglib實(shí)現(xiàn)代理不需要接口
		return new ObjenesisCglibAopProxy(config);
	}
	else {
		return new JdkDynamicAopProxy(config);
	}
}

@Override
public Object getProxy(ClassLoader classLoader) {
     //。。。。。。
      // Configure CGLIB Enhancer...
      Enhancer enhancer = createEnhancer();
      if (classLoader != null) {
         enhancer.setClassLoader(classLoader);
         if (classLoader instanceof SmartClassLoader &&
               ((SmartClassLoader) classLoader).isClassReloadable(proxySuperClass)) {
            enhancer.setUseCache(false);
         }
      }
      enhancer.setSuperclass(proxySuperClass);
      enhancer.setInterfaces(AopProxyUtils.completeProxiedInterfaces(this.advised));
      enhancer.setNamingPolicy(SpringNamingPolicy.INSTANCE);
      enhancer.setStrategy(new ClassLoaderAwareUndeclaredThrowableStrategy(classLoader));
	//獲取攔截回調(diào)函數(shù)
      Callback[] callbacks = getCallbacks(rootClass);
      Class<?>[] types = new Class<?>[callbacks.length];
      for (int x = 0; x < types.length; x++) {
         types[x] = callbacks[x].getClass();
      }
      // fixedInterceptorMap only populated at this point, after getCallbacks call above
      enhancer.setCallbackFilter(new ProxyCallbackFilter(
            this.advised.getConfigurationOnlyCopy(), this.fixedInterceptorMap, this.fixedInterceptorOffset));
      enhancer.setCallbackTypes(types);
      // Generate the proxy class and create a proxy instance.
    //返回一個(gè)cglib代理對(duì)象
      return createProxyClassAndInstance(enhancer, callbacks);
   }
   catch (CodeGenerationException ex) {
       //、、、、、、
   }
}

// Choose an "aop" interceptor (used for AOP calls).
Callback aopInterceptor = new DynamicAdvisedInterceptor(this.advised);

public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
   Object oldProxy = null;
   boolean setProxyContext = false;
   Class<?> targetClass = null;
   Object target = null;
   try {
       //這里注入的advised就是之前創(chuàng)建的ProxyFactory對(duì)象
      if (this.advised.exposeProxy) {
         // Make invocation available if necessary.
         oldProxy = AopContext.setCurrentProxy(proxy);
         setProxyContext = true;
      }
      // May be null. Get as late as possible to minimize the time we
      // "own" the target, in case it comes from a pool...
      target = getTarget();
      if (target != null) {
         targetClass = target.getClass();
      }
       //根據(jù)切面信息創(chuàng)建切面內(nèi)容調(diào)用鏈
      List<Object> chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);
      Object retVal;
      // Check whether we only have one InvokerInterceptor: that is,
      // no real advice, but just reflective invocation of the target.
      if (chain.isEmpty() && Modifier.isPublic(method.getModifiers())) {
         // We can skip creating a MethodInvocation: just invoke the target directly.
         // Note that the final invoker must be an InvokerInterceptor, so we know
         // it does nothing but a reflective operation on the target, and no hot
         // swapping or fancy proxying.
         Object[] argsToUse = AopProxyUtils.adaptArgumentsIfNecessary(method, args);
         retVal = methodProxy.invoke(target, argsToUse);
      }
      else {
         // We need to create a method invocation...
          //創(chuàng)建一個(gè)方法調(diào)用對(duì)象，具體調(diào)用實(shí)現(xiàn)沒分析，Before邏輯大概是先調(diào)用切面，在反射調(diào)用目標(biāo)方法
         retVal = new CglibMethodInvocation(proxy, target, method, args, targetClass, chain, methodProxy).proceed();
      }
      retVal = processReturnType(proxy, target, method, retVal);
      return retVal;
   }
   finally {
      if (target != null) {
         releaseTarget(target);
      }
      if (setProxyContext) {
         // Restore old proxy.
         AopContext.setCurrentProxy(oldProxy);
      }
   }
}