public async Task <ICollection <long> > GetRecommendedGamesAsync(GetRecommendedGamesQueryDto query, CancellationToken ct = default)
{
_logger.LogInformation("Get recommended games for game {GameId} for account {AccountId}", query.GameId);
var transactions = await GetGameTransactionsAsync(query, ct);
return(GetRecommendedGames(query, transactions));
}
private async Task <long[][]> GetGameTransactionsAsync(
GetRecommendedGamesQueryDto query,
CancellationToken ct)
{
var transactions =
query.AccountId.HasValue ?
await _unitOfWork.OrderRepository.GetGameTransactionsByAccountAsync(query.AccountId.Value, query.GameId, ct) :
await _unitOfWork.OrderRepository.GetGameTransactionsByGameAsync(query.GameId, ct);
return(transactions.Select(s => s.Select(i => i.GameId).ToArray()).ToArray());
}
private ICollection <long> GetRecommendedGames(GetRecommendedGamesQueryDto query, long[][] transactions)
{
var transactionalPercentage =
transactions.Length * 100 / _recommendationConfiguration.PercentageOfTransaction;
var apriori = new Apriori <long>(transactionalPercentage, _recommendationConfiguration.Confident);
var classifier = apriori.Learn(transactions);
var matches = classifier.Decide(new SortedSet <long> {
query.GameId
});
return(matches.SelectMany(t => t.Select(i => i)).Distinct().Take(query.Take).ToList());
}
public async Task <ICollection <GetGameDto> > GetRecommendedGamesAsync(GetRecommendedGamesQueryDto query)
{
_logger.LogInformation("Get recommended games for {GameId}", query.GameId);
IEnumerable <long> gameIds =
await _recommendationApiClient.GetRecommendedGamesForGameAsync(
_httpContextAccessor.GetAuthorizationHeaderOrDefault(),
query);
var gameIdsDto = new GetGameByIdsDto(gameIds);
ICollection <GetGameDto> games = await _gameApiClient.GetGameByIdsAsync(gameIdsDto);
return(games);
}
protected override async Task <IEnumerable <long> > ExecuteAsync(GetRecommendedGamesQuery request, CancellationToken ct)
{
GetRecommendedGamesQueryDto queryDto = _mapper.Map <GetRecommendedGamesQueryDto>(request);
return(await _recommendationService.GetRecommendedGamesAsync(queryDto, ct));
}
public async Task <IActionResult> GetRecommendedGames([FromQuery] GetRecommendedGamesQueryDto query)
{
return(Ok(await _recommendationService.GetRecommendedGamesAsync(query)));
}
