public PriceBlotterViewModel(IDependencyContainer container)
{
_instrumentPriceUpdateSubject = new Subject <KeyValuePair <string, InstrumentPriceUpdate[]> >();
DoubleClickPriceCommand = new DelegateCommand(o => o != null, o =>
{
var evt = DisplayPriceHistory;
if (evt != null)
{
string selectedPriceInstrument = ((InstrumentPrice)o).InstrumentName;
evt(this, new PriceHistoryEventArgs(selectedPriceInstrument));
}
});
_instrumentUpdaterTaskFactory = new TaskFactory(TaskScheduler.FromCurrentSynchronizationContext());
_priceAggregatorService = container.Resolve <IPriceAggregatorService>();
IDisposable aggregatedPriceChangeSubscription = _priceAggregatorService.Subscribe(new System.Reactive.AnonymousObserver <AggregatedPriceChangeNotification>(item =>
{
_instrumentUpdaterTaskFactory.StartNew(() =>
{
AggregatedPriceChangeNotification tmpNotification = item;
UpdateDataSource(tmpNotification);
if (!_compositeDisposable.IsDisposed)
{
_instrumentPriceUpdateSubject.OnNext(new KeyValuePair <string, InstrumentPriceUpdate[]>(tmpNotification.LatestUpdate.Instrument, tmpNotification.RecentPriceChanges));
}
});
}));
_priceAggregatorService.SubScribeToNotifications();
_compositeDisposable = new CompositeDisposable(aggregatedPriceChangeSubscription, _instrumentPriceUpdateSubject, (IDisposable)container);
}
public void UpdateDataSource(AggregatedPriceChangeNotification value)
{
AggregatedPriceChangeNotification tmpValue = value;
InstrumentPrice instrumentPrice = InstrumentPrices.FirstOrDefault(x => x.InstrumentName == value.LatestUpdate.Instrument);
if (instrumentPrice == null)
{
InstrumentPrices.Add(new InstrumentPrice
{
AveragePrice = value.AveragePrice,
InstrumentName = value.LatestUpdate.Instrument,
Price = value.LatestUpdate.Price,
RecentPriceChanges = new ObservableCollection <InstrumentPriceHistory>(value.RecentPriceChanges.Where(x => x != null).Select(x => new InstrumentPriceHistory
{
InstrumentName = x.Instrument, Price = x.Price
}
)),
PriceChangeStatus = value.PriceChangeStatus,
AveragePriceChangeStatus = value.AveragePriceChangeStatus
});
}
else
{
instrumentPrice.AveragePrice = value.AveragePrice;
instrumentPrice.InstrumentName = value.LatestUpdate.Instrument;
instrumentPrice.Price = value.LatestUpdate.Price;
instrumentPrice.RecentPriceChanges =
new ObservableCollection <InstrumentPriceHistory>(
value
.RecentPriceChanges
.Where(x => x != null)
.Select(x => new InstrumentPriceHistory {
InstrumentName = x.Instrument, Price = x.Price
}
));
instrumentPrice.PriceChangeStatus = value.PriceChangeStatus;
instrumentPrice.AveragePriceChangeStatus = value.AveragePriceChangeStatus;
}
}