log("dsync: Unable to call Refresh failed with %s for %#v at %s\n", err, args, c)
			} else {
				ch <- refreshResult{refreshed: refreshed}
				log("dsync: Refresh returned false for %#v at %s\n", args, c)
			}
		}(index, c)
	}

	// Wait until we have either
	//
	// a) received all refresh responses
	// b) received too many refreshed for quorum to be still possible
	// c) timed out
	//

        """
        if self.cid is not None:
            fetcher = self._create_credentials_fetcher()
            return RefreshableCredentials.create_from_metadata(
                metadata=fetcher(),
                refresh_using=fetcher,
                method=self.METHOD,
            )
        else:
            return None

    def _create_credentials_fetcher(self):
        method = self.METHOD

        def fetch_credentials():

type lockRESTServer struct {
	ll *localLocker
}

// RefreshHandler - refresh the current lock
func (l *lockRESTServer) RefreshHandler(args *dsync.LockArgs) (*dsync.LockResp, *grid.RemoteErr) {
	resp := lockRPCRefresh.NewResponse()
	refreshed, err := l.ll.Refresh(context.Background(), *args)
	if err != nil {
		return l.makeResp(resp, err)
	}
	if !refreshed {
		return l.makeResp(resp, errLockNotFound)
	}
	return l.makeResp(resp, err)

	switch cfg.Name {
	case storageclass.STANDARD, storageclass.RRS:
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errTierReservedName), r.URL)
		return
	}

	// Refresh from the disk in case we had missed notifications about edits from peers.
	if err := globalTierConfigMgr.Reload(ctx, objAPI); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	if err != nil {
		return nil, err
	}

	// Refresh obtains a fresh token
	err = spt.Refresh()
	if err != nil {
		return nil, err
	}

	tc := azblob.NewTokenCredential(spt.Token().AccessToken, func(tc azblob.TokenCredential) time.Duration {
		err := spt.Refresh()
		if err != nil {
			return 0
		}
		// set the new token value

	// Canceling the context will abort the remote call.
	// In that case, the resource may or may not be unlocked.
	Unlock(ctx context.Context, args LockArgs) (bool, error)

	// Refresh the given lock to prevent it from becoming stale
	Refresh(ctx context.Context, args LockArgs) (bool, error)

	// Unlock (read/write) forcefully for given LockArgs. It should return
	// * a boolean to indicate success/failure of the operation

// RUnlock calls read unlock REST API.
func (c *lockRESTClient) RUnlock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
	return c.call(ctx, lockRPCRUnlock, &args)
}

// Refresh calls Refresh REST API.
func (c *lockRESTClient) Refresh(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
	return c.call(ctx, lockRPCRefresh, &args)
}

// Unlock calls write unlock RPC.

	if err != nil {
		logger.LogOnceIf(ctx, fmt.Errorf("%s, using default of 10s", err.Error()), "refresh-kms-master-key")
		cacheDuration = defaultCacheDuration
	}
	if cacheDuration < time.Second {
		logger.LogOnceIf(ctx, errors.New("cache duration is less than 1s, using default of 10s"), "refresh-kms-master-key")
		cacheDuration = defaultCacheDuration
	}
	timer := time.NewTimer(cacheDuration)
	defer timer.Stop()

          "refId": "PrometheusVariableQueryEditor-VariableQuery"
        },
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "type": "query"
      }
    ]
  },
  "time": {
    "from": "now-1h",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",

	dm2 := NewDRWMutex(ds, "noot")

	dm1.Lock(id, source)
	dm2.Lock(id, source)
	dm1.Unlock(context.Background())
	dm2.Unlock(context.Background())
}

// Test refreshing lock - refresh should always return true
func TestSuccessfulLockRefresh(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping test in short mode.")
	}

	dm := NewDRWMutex(ds, "aap")