public CircleApplicationService(
     ICircleFactory circleFactory,
     ICircleRepository circleRepository,
     ICircleInvitationRepository circleInvitationRepository,
     CircleService circleService,
     IUserRepository userRepository)
 {
     this.circleFactory              = circleFactory;
     this.circleRepository           = circleRepository;
     this.circleInvitationRepository = circleInvitationRepository;
     this.circleService              = circleService;
     this.userRepository             = userRepository;
 }