public async Task <List <SearchResult> > GetSearchResultsAsync(string query)
{
if (string.IsNullOrEmpty(query))
{
return(null);
}
bool googleSearchEnabled;
bool bingSearchEnabled;
try
{
googleSearchEnabled = bool.Parse(ConfigurationManager.AppSettings["GoogleSearchEnabled"]);
bingSearchEnabled = bool.Parse(ConfigurationManager.AppSettings["BingSearchEnabled"]);
}
catch (Exception)
{
return(null);
}
var searchTasks = new List <Task <List <SearchResult> > >();
var registerTask = new Action <bool, ISearcher>(
(flag, searcher) =>
{
if (flag && searcher != null)
{
searchTasks.Add(searcher.GetSearchResultsAsync(query));
}
});
ISearcher googleSearcher = _searcherFactory.CreateGoogleSearcher();
ISearcher bingSearcher = _searcherFactory.CreateBingSearcher();
registerTask(googleSearchEnabled, googleSearcher);
registerTask(bingSearchEnabled, bingSearcher);
Task <List <SearchResult> > firstExecutedTask;
try
{
firstExecutedTask = await Task.WhenAny(searchTasks);
}
catch (ArgumentException)
{
return(null);
}
List <SearchResult> searchResults = await firstExecutedTask;
if (searchResults?.Count() != 0)
{
_searchRepository.AddSearchResults(searchResults, query);
}
return(searchResults);
}