@abstractmethod<EOL><INDENT>def on_successful_login(self, subject, authc_token, account):<DEDENT>
pass<EOL>
Reacts to a successful authentication attempt, typically saving the
identifier to be retrieved ('remembered') for future system access.

:param subject: the subject that executed a successful authentication
                attempt
:param token:   the authentication token submitted resulting in a
                successful authentication attempt
:param account: the account returned as a result of the
                successful authentication attempt