/// <summary>
/// This either searches the ranking in in-memory cache or calcualate the new one from searchProvider.
/// </summary>
/// <param name="searchString"></param>
/// <param name="url"></param>
/// <param name="searchOption"></param>
/// <returns>
/// Async - The List of ranking for various keyword seperated by comma.
/// </returns>
private async Task <List <int> > LookupRankingByKeyword(string searchString, string url, int searchOption)
{
var rankingList = new List <int>();
string[] words = searchString.Split(",");
var ratingService = RatingService.ExecuteCreation((SearchType)searchOption, url);
foreach (var word in words)
{
if (!_cache.TryGetValue($"{word}-{url}-{searchOption}", out int ranking))
{
Console.WriteLine("Cache miss....loading from service into cache");
var result = await ratingService.GetRanking(word);
rankingList.Add(result);
ranking = result;
_cache.Set($"{word}-{url}-{searchOption}", ranking, _options);
}
else
{
Console.WriteLine("Cache hit");
Response.Headers.Add("CACHE", "true");
rankingList.Add(ranking);
}
}
return(rankingList);
}
