public InstrumentsAccessService(
     IInstrumentsRepository instrumentRepository,
     IOrderBookService orderBookService)
 {
     _instrumentRepository = instrumentRepository;
     _orderBookService     = orderBookService;
     _cache = new InMemoryCache <Instrument>(instrument => instrument.AssetPair, false);
 }
 public InstrumentsService(IInstrumentsRepository instrumentsRepository)
 {
     _instrumentsRepository = instrumentsRepository;
 }