Advice在Spring AOP中对应API

protected Object buildLazyResolutionProxy(final DependencyDescriptor descriptor, final @Nullable String beanName) {
    BeanFactory beanFactory = getBeanFactory();
    Assert.state(beanFactory instanceof DefaultListableBeanFactory,
        "BeanFactory needs to be a DefaultListableBeanFactory");
    final DefaultListableBeanFactory dlbf = (DefaultListableBeanFactory) beanFactory;
    TargetSource ts = new TargetSource() {
      @Override
      public Class<?> getTargetClass() {
        return descriptor.getDependencyType();
      }
      @Override
      public boolean isStatic() {
        return false;
      }
      @Override
      public Object getTarget() {
        Set<String> autowiredBeanNames = (beanName != null ? new LinkedHashSet<>(1) : null);
        Object target = dlbf.doResolveDependency(descriptor, beanName, autowiredBeanNames, null);
        if (target == null) {
          Class<?> type = getTargetClass();
          if (Map.class == type) {
            return Collections.emptyMap();
          }
          else if (List.class == type) {
            return Collections.emptyList();
          }
          else if (Set.class == type || Collection.class == type) {
            return Collections.emptySet();
          }
          throw new NoSuchBeanDefinitionException(descriptor.getResolvableType(),
              "Optional dependency not present for lazy injection point");
        }
        if (autowiredBeanNames != null) {
          for (String autowiredBeanName : autowiredBeanNames) {
            if (dlbf.containsBean(autowiredBeanName)) {
              dlbf.registerDependentBean(autowiredBeanName, beanName);
            }
          }
        }
        return target;
      }
      @Override
      public void releaseTarget(Object target) {
      }
    };
    ProxyFactory pf = new ProxyFactory();
    pf.setTargetSource(ts);
    Class<?> dependencyType = descriptor.getDependencyType();
    if (dependencyType.isInterface()) {
      pf.addInterface(dependencyType);
    }
    return pf.getProxy(dlbf.getBeanClassLoader());
  }