onStart method

@override Future<bool> onStart()

Callback when this executor is started. Returns true if successfully started, false otherwise.

Implementation

@override
Future<bool> onStart() async {
  Duration? interval = samplingConfiguration?.interval;
  if (interval != null) {
    // create a recurrent timer that gets the data point every [frequency].
    _timer ??= Timer.periodic(interval, (Timer t) async {
      try {
        var measurement = await getMeasurement();
        if (measurement != null) addMeasurement(measurement);
      } catch (error) {
        addError(error);
      }
    });
  } else {
    warning(
        '$runtimeType - no valid interval found in sampling configuration: $samplingConfiguration. '
        'Is a valid IntervalSamplingConfiguration provided?');
    return false;
  }
  return true;
}