public Task <CalcData[]> Calculate(BatchTelemetry batchTelemetry)
{
var batchStatsBySensors = batchTelemetry.DataPoints.GroupBy(x => x.SensorId)
.Select(x =>
{
decimal avg = 0, stdDev = 0;
try
{
avg = x.Average(y => y.Value);
stdDev = (decimal)Math.Sqrt((double)x.Select(y => y.Value - avg).Select(y => y * y).Average());
}
catch (OverflowException)
{
//todo: logs
}
return(new CalcData
{
BatchId = batchTelemetry.BatchId,
BatchStartTime = batchTelemetry.BatchStartTime,
SensorId = x.Key,
Average = avg,
StandardDeviation = stdDev
});
})
.ToArray();
return(Task.FromResult(batchStatsBySensors));
}
public Task HandleAsync(IMessage message)
{
var dataPoint = message as DataPoint;
if (dataPoint == null)
{
return(Task.CompletedTask);
}
var currentBatchTelemetry = batchCachingService.GetCurrentBatchTelemetry();
if (currentBatchTelemetry?.BatchId == dataPoint.BatchId)
{
// add telemetry to current batch
currentBatchTelemetry.DataPoints.Add(dataPoint);
batchCachingService.AddCurrentBatchTelemetry(currentBatchTelemetry);
return(Task.CompletedTask);
}
else if (currentBatchTelemetry != null)
{
// send previous batch telemetry to calc service
eventBus.Publish(EventTopic.BatchData, currentBatchTelemetry);
}
// new batch started
currentBatchTelemetry = new BatchTelemetry
{
BatchId = dataPoint.BatchId,
BatchStartTime = dataPoint.BatchTimestamp,
DataPoints = new List <DataPoint> {
dataPoint
}
};
batchCachingService.AddCurrentBatchTelemetry(currentBatchTelemetry);
return(Task.CompletedTask);
}
public void AddCurrentBatchTelemetry(BatchTelemetry batchTelemetry)
{
cache.Store(BatchCacheKey, batchTelemetry, TimeSpan.FromSeconds(batchSettings.BatchCachingTime));
}
