@Component
class RegistrationServiceProxy @Autowired()(restTemplate: RestTemplate) extends RegistrationService {

  @Value("${user_registration_url}")
  var userRegistrationUrl: String = _

  @HystrixCommand(commandProperties=Array(new HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds", value="800")))
  override def registerUser(emailAddress: String, password: String): Either[RegistrationError, String] = {
    try {
      val response = restTemplate.postForEntity(userRegistrationUrl,
        RegistrationBackendRequest(emailAddress, password),
        classOf[RegistrationBackendResponse])
      response.getStatusCode match {
        case HttpStatus.OK =>
          Right(response.getBody.id)
      }
    } catch {
      case e: HttpClientErrorException if e.getStatusCode == HttpStatus.CONFLICT =>
        Left(DuplicateRegistrationError)
    }
  }
}