| ChainUserProvider | Chain User Provider. |
| InMemoryUserProvider | InMemoryUserProvider is a simple non persistent user provider. |
| User | User is the user implementation used by the in-memory user provider. |
| UserChecker | UserChecker checks the user account flags. |
Interfaces
| AdvancedUserInterface | Adds extra features to a user class related to account status flags. |
| UserCheckerInterface | UserCheckerInterface checks user account when authentication occurs. |
| UserInterface | Represents the interface that all user classes must implement. |
| UserProviderInterface | Represents a class that loads UserInterface objects from some source for the authentication system. |