public TradeService(ILogger logger, TradeGenerator tradeGenerator, ISchedulerProvider schedulerProvider)
{
_logger = logger;
_tradeGenerator = tradeGenerator;
_schedulerProvider = schedulerProvider;
//emulate a trade service which asynchronously
IConnectableObservable <IChangeSet <Trade, long> > tradesData = GenerateTradesAndMaintainCache().Publish();
//call AsObservableCache() so the cache can be directly exposed
All = tradesData.AsObservableCache();
//create a derived cache
Live = tradesData.Filter(trade => trade.Status == TradeStatus.Live).AsObservableCache();
//log changes
IDisposable loggerWriter = LogChanges();
_cleanup = new CompositeDisposable(All, tradesData.Connect(), loggerWriter);
}