async public Task <List <Planet> > GetPlanetsAsync()
{
var planets = new List <Planet>();
var swapiUrl = $"{SwapiUrl}/planets/";
if (GetOneSwapiPageAtATime)
{
while (swapiUrl != null)
{
string jsonResult = await HttpService.GetResponseAsJson(swapiUrl);
var swapiPlanetsResponse = JsonConvert.DeserializeObject <SwapiPlanetsResponse>(jsonResult);
planets.AddRange(swapiPlanetsResponse.Results);
swapiUrl = swapiPlanetsResponse.Next;
}
}
else
{
// Helper conversion function - takes an HttpResponse string and, assuming it is an SwapiPlanetsResponse, deserializes it
Func <string, SwapiPlanetsResponse> extractPlanetsFromResponse = response =>
{
return(JsonConvert.DeserializeObject <SwapiPlanetsResponse>(response));
};
// Get pages concurrently (as much as possible)
List <string> allResponses = await HttpService.GetAllResponsePagesAsJson(swapiUrl, response =>
{
return(extractPlanetsFromResponse(response).Count);
});
// Extract the planets from the page responses
allResponses.ForEach(r =>
{
planets.AddRange(extractPlanetsFromResponse(r).Results);
});
//// Here we assume the Star Wars API is fixed (with page size 10) and therefore we can use concurrent data retrieval.
//// The first page tells us how many pages there are.
//const int pageSize = 10;
//string firstPageResponse = await HttpService.GetResponseAsJson(swapiUrl);
//var swapiPlanetsResponse = JsonConvert.DeserializeObject<SwapiPlanetsResponse>(firstPageResponse);
//var pageCount = swapiPlanetsResponse.Count / pageSize;
//if (swapiPlanetsResponse.Count % pageSize > 0)
//{
// pageCount += 1;
//}
//var urls = new List<string>();
//for (var pageNumber = 2; pageNumber <= pageCount; pageNumber++)
//{
// urls.Add($"{swapiUrl}?page={pageNumber}");
//}
//var tasks = urls.Select(url => HttpService.GetResponseAsJson(url));
//var responses = await Task.WhenAll(tasks);
//// Add very first response (page 1)
//var completeList = responses.ToList();
//completeList.Add(firstPageResponse);
//completeList
// .ForEach(r => planets.AddRange(JsonConvert.DeserializeObject<SwapiPlanetsResponse>(r).Results));
}
return(planets);
}
