Injecting dynamic dependencies unspecifiable in the config

[thedew]

Two part newbie question:

I have a set of business logic beans dependent upon a Principal-like object stored in the HttpSession. When I'm retrieving the beans using Spring, I'll need to pass this object into Spring's BeanFactory somehow so it will return a bean applicable to my user's session context.

1) Can this be done using AutowireCapableBeanFactory's applyBeanPropertyValues?

2) If so, when I apply a Prinicpal-like object's properties, will I need to synchronize this process so if two different users request a business logic bean at the same time, the second user will have to wait until the first user's Principal object is applied and a business logic logic bean is returned to him before applying the second user's Principal?

[thedew]

I think I may have found a way to handle this while avoiding synchronization issues. If all of this is obvious to a non-noob, feel free to ignore me.

For all of my business logic beans dependent upon a principal-like User object, I had them implement an interface

interface UserSpecificBean {
  setUser(User user);
}

Then, I created a BeanPostProcessor

class SessionAwarePostProcessor {
   public SessionAwarePostProcessor(HttpSession session) {
     ... get the User object from the session
   }
   public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
    if (bean instanceof UserSpecificBean) {
      ((UserSpecificBean)bean).setUser(user);
    }    
    return bean;
  }
}

and registered it when obtaining my WebApplicationContext

ConfigurableWebApplicationContext context = 
      (ConfigurableWebApplicationContext)WebApplicationContextUtils
      .getRequiredWebApplicationContext(session.getServletContext());
ConfigurableBeanFactory factory = 
        (ConfigurableBeanFactory)context.getBeanFactory();    
factory.addBeanPostProcessor(new SessionAwarePostProcessor (session));

This way, I'm injecting the User-dependency into each bean when I retrieve it instead of into the entire BeanFactory.