public DTO.GetMalRecsResponse GetRecommendations(MalUserListEntries animeList, GetMalRecsRequest recRequest, CancellationToken cancellationToken)
{
// Ignore the cancellation token - we're only cancelling on service shut down, and getting recommendations should be quick.
// If getting recommendations takes longer than the final connection drain time limit, something is wrong.
TInput recSourceInput = GetRecSourceInputFromRequest(animeList, recRequest);
TRecommendationResults recResults = UnderlyingRecSource.GetRecommendations(recSourceInput, recRequest.NumRecsDesired);
List <TDtoRec> dtoRecs = new List <TDtoRec>();
Dictionary <int, DTO.MalAnime> animes = new Dictionary <int, DTO.MalAnime>();
foreach (TRecommendation rec in recResults)
{
TDtoRec dtoRec = new TDtoRec()
{
MalAnimeId = rec.ItemId,
};
animes[rec.ItemId] = new DTO.MalAnime(rec.ItemId, Animes[rec.ItemId].Title, Animes[rec.ItemId].Type);
SetSpecializedRecommendationProperties(dtoRec, rec);
dtoRecs.Add(dtoRec);
}
TResponse response = new TResponse();
response.RecommendationType = RecommendationType;
response.Recommendations = dtoRecs;
SetSpecializedExtraResponseProperties(response, recResults);
HashSet <int> extraAnimesToReturn = GetExtraAnimesToReturn(recResults);
foreach (int extraAnimeId in extraAnimesToReturn)
{
if (!animes.ContainsKey(extraAnimeId))
{
animes[extraAnimeId] = new DTO.MalAnime(extraAnimeId, Animes[extraAnimeId].Title, Animes[extraAnimeId].Type);
}
}
response.Animes = animes.Values.ToList();
return(response);
}
protected override MalUserListEntries GetRecSourceInputFromRequest(MalUserListEntries animeList, GetMalRecsRequest recRequest)
{
return(animeList);
}
/// <summary> /// Converts the user's anime list into the input used by the rec source. /// </summary> /// <param name="animeList"></param> /// <param name="recRequest"></param> /// <param name="caster"></param> /// <returns></returns> protected abstract TInput GetRecSourceInputFromRequest(MalUserListEntries animeList, GetMalRecsRequest recRequest);
protected override MalPositiveFeedbackInput GetRecSourceInputFromRequest(MalUserListEntries animeList, GetMalRecsRequest recRequest)
{
if (recRequest.TargetScore != null)
{
return(new MalPositiveFeedbackInput(animeList, recRequest.TargetScore.Value));
}
else
{
return(new MalPositiveFeedbackInput(animeList, recRequest.TargetFraction.Value));
}
}
public Task <MalRecResults <IEnumerable <IRecommendation> > > GetMalRecommendationsWithFractionTargetAsync(
IDictionary <int, RecEngine.MAL.MalListEntry> animeList, string recSourceName, int numRecsDesired, decimal targetFraction,
TimeSpan timeout, CancellationToken cancellationToken)
{
List <DTO.MalListEntry> dtoAnimeList = CreateDtoAnimeList(animeList);
Operation <GetMalRecsRequest> operation = new Operation <GetMalRecsRequest>(OperationTypes.GetMalRecs,
GetMalRecsRequest.CreateWithTargetFraction(recSourceName, numRecsDesired, targetFraction, new MalListForUser(dtoAnimeList)));
return(GetMalRecommendationsAsync(operation, timeout, cancellationToken));
}
protected override MalAnimeRecsInput GetRecSourceInputFromRequest(MalUserListEntries animeList, GetMalRecsRequest recRequest)
{
if (recRequest.TargetScore != null)
{
return(new MalAnimeRecsInput(animeList, targetScore: recRequest.TargetScore.Value));
}
else
{
return(new MalAnimeRecsInput(animeList, targetFraction: (double)recRequest.TargetFraction.Value));
}
}
public async Task <GetMalRecsResponse> GetMalRecsAsync(GetMalRecsRequest request, CancellationToken cancellationToken)
{
request.AssertArgumentNotNull("request");
request.RecSourceName.AssertArgumentNotNull("request.RecSourceName");
request.AnimeList.AssertArgumentNotNull("request.AnimeList");
request.AnimeList.Entries.AssertArgumentNotNull("request.AnimeList.Entries");
if (request.TargetScore == null && request.TargetFraction == null)
{
Error error = new Error(ErrorCodes.InvalidArgument, "Payload.TargetScore or Payload.TargetFraction must be set.");
throw new RecServiceErrorException(error);
}
string targetScoreString;
if (request.TargetFraction != null)
{
targetScoreString = request.TargetFraction.Value.ToString("P2");
}
else
{
targetScoreString = request.TargetScore.Value.ToString();
}
Logging.Log.InfoFormat("Request for {0} MAL recs using rec source {1}. User has {2} anime list entries. Target score is {3}.",
request.NumRecsDesired, request.RecSourceName, request.AnimeList.Entries.Count, targetScoreString);
// Acquire read lock on rec sources
const int lockTimeoutInSeconds = 3;
using (CancellationTokenSource lockTimeout = new CancellationTokenSource(TimeSpan.FromSeconds(lockTimeoutInSeconds)))
using (CancellationTokenSource lockCancel = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, lockTimeout.Token))
{
bool gotLock = false;
try
{
using (var recSourcesLock = await m_recSourcesLockAsync.EnterReadLockAsync(lockCancel.Token).ConfigureAwait(false))
{
gotLock = true;
// Get rec source by name
if (!m_recSources.ContainsKey(request.RecSourceName))
{
Error error = new Error(errorCode: ErrorCodes.NoSuchRecSource,
message: string.Format("No rec source called \"{0}\" is loaded.", request.RecSourceName));
throw new RecServiceErrorException(error);
}
ITrainableJsonRecSource recSource = m_recSources[request.RecSourceName];
// Convert DTO anime list to RecEngine anime list
Dictionary <int, AnimeRecs.RecEngine.MAL.MalListEntry> entries = new Dictionary <int, RecEngine.MAL.MalListEntry>();
foreach (AnimeRecs.RecService.DTO.MalListEntry dtoEntry in request.AnimeList.Entries)
{
AnimeRecs.RecEngine.MAL.MalListEntry recEngineEntry = new RecEngine.MAL.MalListEntry(dtoEntry.Rating, dtoEntry.Status, dtoEntry.NumEpisodesWatched);
entries[dtoEntry.MalAnimeId] = recEngineEntry;
}
MalUserListEntries animeList = new MalUserListEntries(ratings: entries, animes: m_animes,
malUsername: null, prerequisites: m_prereqs);
Stopwatch timer = Stopwatch.StartNew();
GetMalRecsResponse response = recSource.GetRecommendations(animeList, request, cancellationToken);
timer.Stop();
Logging.Log.InfoFormat("Got recommendations from rec source {0}. Took {1}.", request.RecSourceName, timer.Elapsed);
return(response);
}
}
catch (OperationCanceledException)
{
// If we couldn't get a read lock within 3 seconds, a reload/retrain is probably going on
if (!gotLock)
{
Error error = new Error(errorCode: ErrorCodes.Maintenance,
message: "The rec service is currently undergoing maintenance and cannot respond to rec requests.");
throw new RecServiceErrorException(error);
}
else
{
throw;
}
}
}
}
