Authentication
SecurityContext
Concrete RememberMeServices implementations will have their org.acegisecurity.ui.rememberme.RememberMeServices.autoLogin(HttpServletRequestHttpServletResponse) method called by this filter.
RememberMeServices
Acegi Security filters (namely org.acegisecurity.ui.AbstractProcessingFilter and org.acegisecurity.ui.rememberme.RememberMeProcessingFilter will call the methods provided by an implementation of this interface.
Implementations may implement any type of remember-me capability they wish. Rolling cookies (as per http://fishbowl.pastiche.org/2004/01/19/persistent_login_cookie_best_practice) can be used, as can simple implementations that don't require a persistent store.
This implementation does not rely on an external database, so is attractive for simple applications.