public GetPlaylistListQueryHandler(ICatalogRepository catalogRepository, IPlaylistFilter playlistFilter, IMapper mapper, ILogger <GetPlaylistListQueryHandler> logger)
{
_catalogRepository = catalogRepository ?? throw new ArgumentNullException(nameof(catalogRepository));
_playlistFilter = playlistFilter ?? throw new ArgumentNullException(nameof(playlistFilter));
_mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async Task <IPagedCollection <Playlist> > GetPlaylists(IPlaylistFilter filter, int pageNumber, int pageSize, CancellationToken cancellationToken)
{
var linqPlaylistFilter = filter as LinqPlaylistFilter;
if (linqPlaylistFilter is null)
{
throw new ArgumentException("Sql catalog repository expects a linq playlist filter");
}
return(await _catalogDbContext
.Playlists
.TagWithQueryName(nameof(GetPlaylists))
.Where(linqPlaylistFilter.Filter)
.Include(e => e.PlaylistTracks)
.ToPagedCollectionAsync(pageNumber, pageSize, cancellationToken));
}
public async Task <IPagedCollection <PlaylistDetail> > Handle(GetPlaylistListQuery request, CancellationToken cancellationToken)
{
if (request is null)
{
throw new ArgumentNullException(nameof(request));
}
_logger.LogInformation("Handle {QueryType} for playlists like {PlaylistName} with page number {PageNumber} and page size {PageSize}", nameof(GetPlaylistListQuery), request.Name, request.PageNumber, request.PageSize);
IPlaylistFilter filter = _playlistFilter
.WhereTrackIdEquals(request.TrackId)
.WhereNameLike(request.Name);
IPagedCollection <Playlist> playlistsDomain = await _catalogRepository.GetPlaylists(filter, request.PageNumber, request.PageSize, cancellationToken);
var playlists = _mapper.Map <IReadOnlyList <PlaylistDetail> >(playlistsDomain);
return(new PagedCollection <PlaylistDetail>(playlists, playlistsDomain.ItemCount, playlistsDomain.CurrentPageNumber, playlistsDomain.PageSize));
}
