class RemoteService implements RemoteServiceInterface {
  private static final int THRESHOLD = 200;
  private static RemoteService service = null;
  private final RandomProvider randomProvider;

  static synchronized RemoteService getRemoteService() {<FILL_FUNCTION_BODY>}

  private RemoteService() {
    this(Math::random);
  }

  /**
   * This constructor is used for testing purposes only.
   */
  RemoteService(RandomProvider randomProvider) {
    this.randomProvider = randomProvider;
  }

  /**
   * Remote function takes a value and multiplies it by 10 taking a random amount of time. Will
   * sometimes return -1. This imitates connectivity issues a client might have to account for.
   *
   * @param value integer value to be multiplied.
   * @return if waitTime is less than {@link RemoteService#THRESHOLD}, it returns value * 10,
   *     otherwise {@link RemoteServiceStatus#FAILURE}.
   */
  @Override
  public long doRemoteFunction(int value) {

    long waitTime = (long) Math.floor(randomProvider.random() * 1000);

    try {
      sleep(waitTime);
    } catch (InterruptedException e) {
      LOGGER.error("Thread sleep state interrupted", e);
      Thread.currentThread().interrupt();
    }
    return waitTime <= THRESHOLD ? value * 10
        : RemoteServiceStatus.FAILURE.getRemoteServiceStatusValue();
  }
}

    if (service == null) {
      service = new RemoteService();
    }
    return service;
  
<no_super_class>