private Task DoPersistData(
IDictionary <byte, ICollection <byte> > data, IDictionary <byte, byte> averages, DateTime currentTime, CancellationToken ct)
{
string fileName = _sensorDataUtil.GetDataFileName(currentTime, _options.PersistInterval);
string filePath = Path.Combine(_options.PersistDirectory, fileName);
Task persistTask = _writer.WriteData(data, averages, filePath, ct);
return(persistTask);
}
public async Task <ActionResult> GetSensorData([FromRoute] byte deviceID, [FromQuery] DateTime when)
{
// ASP.NET could convert date time parameters to local time, more here: https://stackoverflow.com/q/10293440/608971
if (when.Kind == DateTimeKind.Local)
{
when = when.ToUniversalTime();
}
DateTime normalizedWhen = _sensorDataUtil.Normalize(when, _options.PersistInterval);
SensorDataCacheKey key = new SensorDataCacheKey(deviceID, normalizedWhen);
SensorDataResult searchResult;
if (_memoryCache.TryGetValue(key, out SensorDataResult cachedResult))
{
_logger.LogDebug("Use cached data for sensor {0} for {1}.", deviceID, when);
searchResult = cachedResult;
}
else
{
string fileName = _sensorDataUtil.GetDataFileName(when, _options.PersistInterval);
string filePath = Path.Combine(_options.DataDirectory, fileName);
if (!System.IO.File.Exists(filePath))
{
return(NotFound($"Data for sensor {deviceID} was not found for the specified date time {when}."));
}
searchResult = await _dataReader.FindSensorData(deviceID, filePath);
_memoryCache.Set(key, searchResult);
}
ActionResult actionResult = ProcessSearchResult(deviceID, when, searchResult);
return(actionResult);
}