code: private void _addDataWithoutLock(String seriesName, DataPoint dataPoint) {
          if (dataStore == null) {
              dataStore = new Import(deviceId, projectId);
          }
          dataStore.addDataPoint(seriesName, dataPoint);
  
          DataStore store = seriesToBatch.get(seriesName);
          if (store == null) {
              store = new DataStore(seriesName);
              seriesToBatch.put(seriesName, store);
              dataBatches.add(store);
          }
          store.add(dataPoint.getTime(), seriesName, dataPoint.getValue());
      }
docs: /* A lock should always be acquired before calling this method!