/// <summary>
/// Fetches the data for languages specified by <code>cultures</code> and merges / adds it to internally used dictionaries.
/// </summary>
/// <param name="cultures">A <see cref="IEnumerable{CultureInfo}" /> specifying the languages in which to fetch the data</param>
/// <param name="clearExistingData">Value indicating whether the internally used dictionaries should be cleared before fetched data is added</param>
/// <returns>A <see cref="Task" /> representing the async operation</returns>
private async Task FetchAndMergeAll(IEnumerable <CultureInfo> cultures, bool clearExistingData)
{
Contract.Requires(cultures != null && cultures.Any());
var cultureInfos = cultures as IReadOnlyList <CultureInfo> ?? cultures.ToList();
Metric.Context("CACHE").Meter("SportDataCache->FetchAndMergeAll", Unit.Calls).Mark($"Getting for cultures='{string.Join(",", cultureInfos.Select(c => c.TwoLetterISOLanguageName))}'.");
var fetchTasks = cultureInfos.Select(c => _dataRouterManager.GetAllSportsAsync(c)).ToList();
fetchTasks.AddRange(cultureInfos.Select(c => _dataRouterManager.GetAllTournamentsForAllSportAsync(c)).ToList());
fetchTasks.AddRange(cultureInfos.Select(c => _dataRouterManager.GetAllLotteriesAsync(c)).ToList());
if (clearExistingData)
{
FetchedCultures.Clear();
Categories.Clear();
Sports.Clear();
}
await Task.WhenAll(fetchTasks).ConfigureAwait(false);
foreach (var culture in cultureInfos)
{
FetchedCultures.Add(culture);
}
}
