public async Task <List <Quote> > GetQuotes(List <string> symbols)
{
var existingQuotes = await _stockData.GetQuotes();
List <Quote> quotesToReuse = new List <Quote>();
List <Quote> quotesToRefresh = new List <Quote>();
foreach (var quote in existingQuotes)
{
if (DateTimeOffset.UtcNow.Subtract(quote.UpdatedDate).TotalMinutes > 5)
{
quotesToRefresh.Add(quote);
}
else
{
if (symbols.Contains(quote.Symbol))
{
symbols.Remove(quote.Symbol);
}
quotesToReuse.Add(quote);
}
}
var symbolsToRetrieve = quotesToRefresh.Select(q => q.Symbol).Union(symbols).Distinct().ToList();
if (symbolsToRetrieve.Any())
{
ConcurrentQueue <Quote> quotes = new ConcurrentQueue <Quote>();
await Task.WhenAll(symbolsToRetrieve.Select(symbol => Task.Run(async() =>
{
var quote = await _iexClient.GetQuote(symbol);
quotes.Enqueue(new Quote
{
Symbol = quote.symbol,
Price = quote.latestPrice,
QuoteDate = quote.latestUpdate,
UpdatedDate = DateTimeOffset.UtcNow
});
})));
quotesToRefresh = quotes.ToList();
await _stockData.SaveQuotes(quotesToRefresh);
}
return(quotesToReuse.Union(quotesToRefresh).ToList());
}
public async Task <List <Quote> > GetQuotes(List <string> symbols)
{
var existingQuotes = await _stockData.GetQuotes();
List <Quote> quotesToReuse = new List <Quote>();
List <Quote> quotesToRefresh = new List <Quote>();
foreach (var quote in existingQuotes)
{
if (DateTimeOffset.UtcNow.Subtract(quote.UpdatedDate).TotalMinutes > 5)
{
quotesToRefresh.Add(quote);
}
else
{
if (symbols.Contains(quote.Symbol))
{
symbols.Remove(quote.Symbol);
}
quotesToReuse.Add(quote);
}
}
var symbolsToRetrieve = quotesToRefresh.Select(q => q.Symbol).Union(symbols).Distinct().ToList();
if (symbolsToRetrieve.Any())
{
var quotes = await _alphaClient.Execute(x => x.RequestBatchQuotesAsync(symbolsToRetrieve.ToArray()));
quotesToRefresh = quotes.Select(q => new Quote
{
Symbol = q.Symbol,
Price = q.Price,
QuoteDate = q.Time,
UpdatedDate = DateTimeOffset.UtcNow
}).ToList();
await _stockData.SaveQuotes(quotesToRefresh);
}
return(quotesToReuse.Union(quotesToRefresh).ToList());
}
