public async Task <ExchangeRatesResponse> GetRates(ExchangeRatesRequest request)
{
if (request is null)
{
throw new ArgumentNullException(nameof(request));
}
var cacheKey = BuildCacheKey(request);
var response = _Cache.Get(cacheKey) as ExchangeRatesResponse;
if (response is null)
{
response = await _Access.GetRates(request);
_Cache.Add(cacheKey, response, new CacheItemPolicy());
}
return(response);
}
private string BuildCacheKey(ExchangeRatesRequest request)
{
var cacheKey = $"{request.BaseCurrency}|{request.Date.ToString("yyyyMMdd", CultureInfo.InvariantCulture)}";
return(cacheKey);
}