stockData))); //#A
async Task <Tuple <string, StockData[]> > ProcessStockHistoryRetry(string symbol)
{
string stockHistory =
await AsyncEx.Retry(() => DownloadStockHistory(symbol), 5, TimeSpan.FromSeconds(2));
StockData[] stockData = await ConvertStockHistory(stockHistory);
return(Tuple.Create(symbol, stockData));
}
async Task <Tuple <string, StockData[]> > ProcessStockHistoryComplete(string symbol)
{
var stockData = await AsyncEx.Retry(() =>
DownloadStockHistory(symbol)
.OrElse(() => StreamReadStockHistory(symbol))
.Bind(stockHistory => ConvertStockHistory(stockHistory)), 3, TimeSpan.FromSeconds(1));
return(Tuple.Create(symbol, stockData));
}
static async Task RunDownloadImageWithRetry()
{
// DEMO 6.2
// Combinator Retry/otherwise
Image image = await AsyncEx.Retry(async() =>
await DownloadImageAsync("Bugghina001.jpg")
.Otherwise(async() =>
await DownloadImageAsync("Bugghina002.jpg")),
5, TimeSpan.FromSeconds(2));
ProcessImage(image);
}
async Task <Tuple <string, StockData[]> > ProcessStockHistoryConditional(string symbol)
{
Func <Func <string, string>, Func <string, Task <string> > > downloadStock =
service => stock => DownloadStockHistory(service, stock); // #C
Func <string, Task <string> > googleService =
downloadStock(googleSourceUrl); // #D
Func <string, Task <string> > yahooService =
downloadStock(yahooSourceUrl); // #D
return(await AsyncEx.Retry( // #E
() => googleService(symbol).Otherwise(() => yahooService(symbol)), //#F
5, TimeSpan.FromSeconds(2))
.Bind(data => ConvertStockHistory(data)) // #G
.Map(prices => Tuple.Create(symbol, prices))); // #H
}
private async Task <IEnumerable <AlbumTracksSearchEntry> > GetAllMusicTracksInternal(string searchString,
CancellationToken token)
{
_logger.LogInformation(searchString);
var client =
new RestClient($"https://itunes.apple.com/lookup?id={searchString}&entity=song");
var request = new RestRequest(Method.GET);
IRestResponse response = await AsyncEx.Retry(() => client.ExecuteAsync(request, token), 3,
TimeSpan.FromMilliseconds(100), token);
var searchResponse =
JsonConvert.DeserializeObject <ApiResponse <AlbumTracksSearchEntry> >(response.Content);
await _cachingProvider.SetAsync(searchString, searchResponse.Results,
TimeSpan.FromMinutes(ExpirationCacheInMinutes));
return(searchResponse.Results.Where(x => x.TrackId != null));
}