class AuthenticationApi {
 public:
  static AuthenticationApi* GetInstance();
  AuthenticationResponse& Authenticate(AuthenticationRequest&);
  const std::string Info();

 private:
  AuthenticationApi();
  virtual ~AuthenticationApi();
  static AuthenticationApi* instance_;
  AuthenticationResponse& GenerateSuccessfullResult(AuthenticationRequest&);
  AuthenticationResponse& GenerateFailureResult(AuthenticationRequest&);
}