@Override
 public int getNoOfTotalDevice() {
   List<RegisteredDevice> rd = commonDao.fetchObjects(RegisteredDevice.class);
   if (rd != null && !rd.isEmpty()) {
     return rd.size();
   }
   return 0;
 }
 @Override
 public List<User> fetchAllUser() {
   return commonDao.fetchObjects(User.class);
 }
 @Override
 public User findUserById(Long userId) {
   return commonDao.getObjectByID(User.class, userId);
 }
 @Override
 public void deleteRegisteredDeviceById(Long id) {
   RegisteredDevice registeredDevice = commonService.getObjectByID(RegisteredDevice.class, id);
   if (registeredDevice != null) commonService.deleteObject(registeredDevice);
 }
 @Override
 public List<RegisteredDevice> getAllDevices(
     int start, int max, String orderBy, String orderType) {
   return commonDao.fetchObjects(RegisteredDevice.class, start, max, orderBy, orderType);
 }