public MainViewModel(IDataService dataService)
{
_dataService = dataService;
_dataService.GetSamples().GroupBy(sample => new { sample.SensorId, sample.UnitOfMeasure }).ObserveOnDispatcher().Subscribe(grp =>
{
var sampleGroup = new SampleGroup
{
SensorId = grp.Key.SensorId,
UnitOfMeasure = grp.Key.UnitOfMeasure,
Samples = new ObservableCollection<double>()
};
SampleGroups.Add(sampleGroup);
grp.Buffer(5).Subscribe(window => sampleGroup.AverageMeasurement = window.Average(avg => avg.SensorValue));
/*grp.Scan(new { sum = .0, count = 0 }, (agg, sample) => new { sum = agg.sum + sample.SensorValue, count = agg.count + 1 })
.Select(agg => agg.sum / agg.count).ObserveOnDispatcher().Subscribe(average => sampleGroup.AverageMeasurement = average);*/
grp.Sample(TimeSpan.FromSeconds(1)).ObserveOnDispatcher().Select(sample => sample.SensorValue).Subscribe(sampleGroup.Samples.Add);
});
_dataService
.GetSamples()
.Where(sample => sample.SampleType == SensorSample.SampleTypes.Temperature && sample.SensorValue < -25)
.ObserveOnDispatcher().Subscribe(sample => Warnings.Add(string.Format("Warning: Sensor {0} registerede temperature of {1:0.00}", sample.SensorId, sample.SensorValue)));
}