classDiagram class AuthenticationManager { authenticate(Authentication authentication) Authentication } class AuthenticationProvider { authenticate(Authentication authentication) Authentication supports(Class~?~ authentication) boolean } class UserDetailsService { loadUserByUsername(String username) UserDetails } class UserDetails AuthenticationProvider <|-- ProviderManager AuthenticationManager --> AuthenticationProvider : authRequest AuthenticationManager <.. UserDetailsService : 서비스 주입 후 authenticate()에서 사용자 정보를 꺼내어 사용 UserDetailsService -- UserDetails