public MainViewModel()
{
Instruments = new ObservableCollection <Instrument>
{
new Instrument("AAPL", 175),
new Instrument("MSFT", 115),
new Instrument("GOOG", 1200),
new Instrument("FB", 160)
};
_subscriptions = new Dictionary <string, Subscription>();
_instrumentMap = new Dictionary <string, Instrument>();
foreach (var instrument in Instruments)
{
_instrumentMap.Add(instrument.Ticker, instrument);
}
IInstrumentFactory instrumentFactory = new InstrumentsProvider();
IProvidePriceGenerator priceGeneratorProvider = new PriceGeneratorProvider(instrumentFactory);
_priceSource = new CompositePriceSource(instrumentFactory, priceGeneratorProvider);
// commands
StartPriceSourceCommand = new RelayCommand(StartPriceSource, CanStartPriceSource);
StopPriceSourceCommand = new RelayCommand(StopPriceSource, CanStopPriceSource);
SubscribeCommand = new RelayCommand <Instrument>(SubscribePrice, CanSubscribePrice);
UnsubscribeCommand = new RelayCommand <Instrument>(UnsubscribePrice, CanUnubscribePrice);
SubscribeAllCommand = new RelayCommand(SubscribeAll, CanSubscribeAll);
UnsubscribeAllCommand = new RelayCommand(UnsubscribeAll, CanUnsubscribeAll);
}