/// <summary>
 /// Occurs when a new user was created.
 /// </summary>
 private void OnUserLeave(User user)
 {
     Emitter.Publish(Key.UserNotify, "user-notify/v1/leave/", user.Serialize());
 }
 /// <summary>
 /// Occurs when a new user was created.
 /// </summary>
 private void OnUserJoin(User user)
 {
     Emitter.Publish(Key.UserNotify, "user-notify/v1/join/", user.Serialize());
 }