@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean != null) {
Object cacheKey = getCacheKey(bean.getClass(), beanName);
if (!this.earlyProxyReferences.contains(cacheKey)) {
return wrapIfNecessary(bean, beanName, cacheKey);
}
}
return bean;
}
protected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey) {
//已经创建
if (beanName != null && this.targetSourcedBeans.contains(beanName)) {
return bean;
}
if (Boolean.FALSE.equals(this.advisedBeans.get(cacheKey))) {
return bean;
}
//基础类或者应该忽略的类，不被通知
if (isInfrastructureClass(bean.getClass()) || shouldSkip(bean.getClass(), beanName)) {
this.advisedBeans.put(cacheKey, Boolean.FALSE);
return bean;
}
// 寻找需要增强器 切面
Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(bean.getClass(), beanName, null);
if (specificInterceptors != DO_NOT_PROXY) {
this.advisedBeans.put(cacheKey, Boolean.TRUE);
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;
}
AnnotationAwareAspectJAutoProxyCreator 实现了BeanPostProcessor，为需要增强的bean创建代理。重点是寻找需要增强器
@Overrideprotected Object[] getAdvicesAndAdvisorsForBean(ClassbeanClass, String beanName, TargetSource targetSource) { Listadvisors = findEligibleAdvisors(beanClass, beanName);
if (advisors.isEmpty()) {
return DO_NOT_PROXY;
}
return advisors.toArray();
}
若不存在切面，则不需要创建代理
protected ListfindEligibleAdvisors(ClassbeanClass, String beanName) {
ListcandidateAdvisors = findCandidateAdvisors();
ListeligibleAdvisors = findAdvisorsThatCanApply(candidateAdvisors, beanClass, beanName);
extendAdvisors(eligibleAdvisors);
if (!eligibleAdvisors.isEmpty()) {
eligibleAdvisors = sortAdvisors(eligibleAdvisors);
}
return eligibleAdvisors;
}
@Override protected List findCandidateAdvisors() {
List advisors = super.findCandidateAdvisors();
advisors.addAll(this.aspectJAdvisorsBuilder.buildAspectJAdvisors());
return advisors;
}
下面分析findCandidateAdvisors方法寻找所有的切面，super.findCandidateAdvisors()寻找 例如xml或其他定义的切面 ，下面aspectJAdvisorsBuilder.buildAspectJAdvisors()寻找@aspect定义得切面。
接下来再对该实现进行探讨
