public async Task DownloadCurrenctRates()
{
var currenciesWithDate = await currencyRateService.GetActiveCurrenciesWithLastDownloadedDate();
var queue = new ConcurrentQueue <CurrencyRate>();
var tasks = currenciesWithDate.Select(c =>
{
return(Task.Run(async() =>
//return new Task(async () =>
{
var uri = tradingDataService.GetCurrencyRateUri(c.Item2?.AddDays(1), c.Item1.Symbol);
var currencyRates = await GetCurrencyRates(c.Item1.Symbol, uri);
foreach (var rate in currencyRates)
{
queue.Enqueue(rate);
}
}));
});
////******* AlphaVantage specific code start********//
////AlphaVantage will only allow 5 call per minute
//foreach (var tsk in tasks)
//{
// tsk.RunSynchronously();
// if (delay.HasValue)
// await Task.Delay(TimeSpan.FromSeconds(delay.Value));
//}
////******* AlphaVantage specific code end********//
await Task.WhenAll(tasks);
await currencyRateService.Save(queue.Select(rate => rate));
}