private async Task <Dictionary <Symbol, Security?> > GetSecuritiesyAsync(HashSet <Symbol> symbols, HistoryFlags historyFlags, Symbol historyBase, CancellationToken ct)
{
HashSet <Symbol> stockAndCurrencyRateSymbols = symbols.Where(s => s.IsStock || s.IsCurrencyRate).ToHashSet();
if (historyBase.IsStock)
{
stockAndCurrencyRateSymbols.Add(historyBase);
}
Dictionary <Symbol, Security?> securities = await Snapshot.GetAsync(stockAndCurrencyRateSymbols, ct).ConfigureAwait(false);
if (historyFlags == HistoryFlags.None)
{
return(securities);
}
if (!historyBase.IsEmpty)
{
await AddCurrencies(symbols, historyBase, securities, ct).ConfigureAwait(false);
}
await AddHistoryToSecurities(securities, historyFlags, ct).ConfigureAwait(false);
if (!historyBase.IsEmpty)
{
HistoryBaseComposer.Compose(symbols, historyBase, securities);
}
return(securities);
}
public YahooHistory(ILogger <YahooHistory>?logger = null)
{
Logger = logger ?? NullLogger <YahooHistory> .Instance;
YahooSnapshot = new YahooSnapshot(); // take Logger
HistoryCache = new AsyncLazyCache <string, List <object>?>(Producer);
SnapshotCache = new AsyncLazyCache <string, Security?>
(async(s, c) => await YahooSnapshot.GetAsync(s, c).ConfigureAwait(false));
}