public RecommendationsController(
IConfiguration configuration, IQueuedRecommendationStorage storage,
IRecommendationQueue queue = null, IQueueHandler handler = null,
ILogger <RecommendationsController> logger = null)
{
_storage = storage;
_queue = queue is null ? new RecommendationQueue(_storage) : queue;
if (handler is null)
{
var optionsBuilder = new DbContextOptionsBuilder <Database.DatabaseContext>();
optionsBuilder.UseSqlServer(configuration["DatabaseConnectionString"]);
_handler = QueueHandler.GetOrCreate(optionsBuilder.Options, configuration, _queue, _storage, logger);
}
else
{
_handler = handler;
}
}
public QueueHandler(DbContextOptions <Database.DatabaseContext> dbContextOptions, IConfiguration configuration, IRecommendationQueue queue, IQueuedRecommendationStorage storage, ILogger logger = null)
{
_queue = queue;
_storage = storage;
_logger = logger;
var engineOptions = configuration.Get <PythonEngineOptions>();
_recommendationEngine = new PythonRecommendationEngine(dbContextOptions, engineOptions);
_runningTasks = new List <RecommendationTask>(ConcurrentRecommendationsLimit);
Task.Run(() =>
{
while (true)
{
Tick();
Thread.Sleep(500);
}
});
}
/// <summary>
/// Either returns an already created instance or creates a new one. This is needed because mvc controllers are recreated on each request
/// </summary>
public static QueueHandler GetOrCreate(DbContextOptions <Database.DatabaseContext> dbContextOptions, IConfiguration configuration, IRecommendationQueue queue, IQueuedRecommendationStorage storage, ILogger logger = null)
{
if (_handlerInstance is null)
{
_handlerInstance = new QueueHandler(dbContextOptions, configuration, queue, storage, logger);
}
return(_handlerInstance);
}
