public FeedUpdater(DbContextOptions <FeedContext> feedContextOptions,
IFeedLoader feedLoader, IMapper mapper)
{
_feedContextOptions = feedContextOptions;
_feedLoader = feedLoader;
_mapper = mapper;
}
public async Task <ViewItem[]> GetCollectionNewsAsync(Guid id,
[FromServices] IFeedLoader feedLoader)
{
var collection = await _context.Collections.GetWithFeedsAsync(id);
var feedsById = collection.Feeds.ToDictionary(f => f.Id);
// Load in parallel
var loading = await Timer.TimeAsync(async() =>
{
var newsByFeed = await _feedCache.GetFeedsAsync(feedsById.Keys.ToHashSet());
return(await Task.WhenAll(feedsById.Values.Select(async feed =>
{
var feedNews = newsByFeed.GetValueOrDefault(feed.Id);
if (feedNews == null)
{
feedNews = await feedLoader.LoadItemsAsync(feed);
await _feedCache.SetFeedAsync(feed.Id, feedNews);
}
return feedNews;
})));
});
_logger.LogDebug($"Loaded all items for collection #{collection.Id} with {collection.Feeds.Count} feeds in {loading.ExecutionTime}.");
return(loading.Result.SelectMany(ns => ns).Select(ViewItem.Create).ToArray());
}
public FeedController(FeedService feedService, IFeedLoader feedLoader)
{
FeedService = feedService;
FeedLoader = feedLoader;
}
public FeedLoaderController(ILogger <FeedLoaderController> logger, IFeedLoader feedLoader)
{
_logger = logger;
_feedLoader = feedLoader;
}
public FeedGenerator(IFeedLoader feedLoader)
{
_feedLoader = feedLoader;
}
public DataManager(IUpdateStrategy updateStrategy, IFeedLoader feedLoader)
{
_updateStrategy = updateStrategy;
_feedLoader = feedLoader;
}