Can Spring's @Cacheable annotation have the same scope as the annotated method's bean?

Question

Is there an easy way to use Spring's @Cacheable annotation with a non-singleton (e.g. session-scoped) bean and have the cache have the same scope as said bean?

Example:

import javax.inject.Inject;
import javax.inject.Named;

import org.springframework.cache.annotation.Cacheable;
import org.springframework.context.annotation.Scope;
import org.springframework.security.core.context.SecurityContextHolder;

@Named
@Scope("session")
public class UserNameRetriever {

    @Inject private UserDao userDao;

    @Cacheable("userName")
    public String getUserName() {
        return userDao.getUserByLogin((String)SecurityContextHolder.getContext().getAuthentication().getPrincipal()).getName();
    }

}

Ideally, UserNameRetriever.getUserName() would fetch the username from the UserDao once per session, but this code actually caches application-wide.

Answer 1

If you want a session cache, use the session. That is, store the user in a private field in the session-scoped bean, or access the HttpSession object directly. @Cacheable is generally meant for application-wide resources.

Well, you can use key="#user.id", and to invalidate the cache (manually or with @CacheEvict) on a @PreDestroy method, but it would be better if you don't mix the two - caching and session data.