@Override
  public void deleteSingleVolumeSnapshot(
      StorageSystem storage, URI snapshot, TaskCompleter taskCompleter)
      throws DeviceControllerException {

    try {
      BlockSnapshot snap = _dbClient.queryObject(BlockSnapshot.class, snapshot);
      VNXeApiClient apiClient = getVnxeClient(storage);
      VNXeLunSnap lunSnap = apiClient.getLunSnapshot(snap.getNativeId());
      if (lunSnap != null) {
        VNXeCommandJob job = apiClient.deleteLunSnap(lunSnap.getId());
        if (job != null) {
          ControllerServiceImpl.enqueueJob(
              new QueueJob(
                  new VNXeBlockDeleteSnapshotJob(job.getId(), storage.getId(), taskCompleter)));
        }
      } else {
        // Perhaps, it's already been deleted or was deleted on the array.
        // In that case, we'll just say all is well, so that this operation
        // is idempotent.
        snap.setInactive(true);
        snap.setIsSyncActive(false);
        _dbClient.updateObject(snap);
        taskCompleter.ready(_dbClient);
      }
    } catch (VNXeException e) {
      _log.error("Delete volume snapshot got the exception", e);
      taskCompleter.error(_dbClient, e);
    } catch (Exception ex) {
      _log.error("Delete volume snapshot got the exception", ex);
      ServiceError error = DeviceControllerErrors.vnxe.jobFailed("DeleteSnapshot", ex.getMessage());
      taskCompleter.error(_dbClient, error);
    }
  }
  @Override
  public void restoreSingleVolumeSnapshot(
      StorageSystem storage, URI volume, URI snapshot, TaskCompleter taskCompleter)
      throws DeviceControllerException {

    try {
      BlockSnapshot snapshotObj = _dbClient.queryObject(BlockSnapshot.class, snapshot);

      VNXeApiClient apiClient = getVnxeClient(storage);
      VNXeLunSnap lunSnap = apiClient.getLunSnapshot(snapshotObj.getNativeId());
      // Error out if the snapshot is attached
      if (lunSnap.getIsAttached()) {
        _log.error(
            "Snapshot {})is attached and cannot be used for restore", snapshotObj.getLabel());
        ServiceError error =
            DeviceControllerErrors.vnxe.cannotRestoreAttachedSnapshot(snapshot.toString());
        taskCompleter.error(_dbClient, error);
      }

      VNXeCommandJob job = apiClient.restoreLunSnap(lunSnap.getId());
      if (job != null) {
        ControllerServiceImpl.enqueueJob(
            new QueueJob(
                new VNXeBlockRestoreSnapshotJob(job.getId(), storage.getId(), taskCompleter)));
      }
    } catch (VNXeException e) {
      _log.error("Restore snapshot got the exception", e);
      taskCompleter.error(_dbClient, e);

    } catch (Exception ex) {
      _log.error("Restore snapshot got the exception", ex);
      ServiceError error =
          DeviceControllerErrors.vnxe.jobFailed("RestoreSnapshotJob", ex.getMessage());
      taskCompleter.error(_dbClient, error);
    }
  }