HomeHandler.cs

public class HomeHandler : IAsyncRequestHandler<Home, List<Album>>
{
    private readonly MusicStoreContext _dbContext;
    private readonly IMemoryCache _cache;
    private readonly IOptions<AppSettings> _options;

    public HomeHandler(MusicStoreContext dbContext, IMemoryCache cache, IOptions<AppSettings> options)
    {
        _dbContext = dbContext;
        _cache = cache;
        _options = options;
    }

    public async Task<List<Album>> Handle(Home message)
    {
        // Get most popular albums
        var cacheKey = "topselling";
        List<Album> albums;
        if (!_cache.TryGetValue(cacheKey, out albums))
        {
            albums = await _dbContext.Albums
                        .OrderByDescending(a => a.OrderDetails.Count)
                        .Take(6)
                        .ToListAsync();

            if (albums != null && albums.Count > 0)
            {
                if (_options.Value.CacheDbResults)
                {
                    // Refresh it every 10 minutes.
                    // Let this be the last item to be removed by cache if cache GC kicks in.
                    _cache.Set(
                        cacheKey,
                        albums,
                        new MemoryCacheEntryOptions()
                        .SetAbsoluteExpiration(TimeSpan.FromMinutes(10))
                        .SetPriority(CacheItemPriority.High));
                }
            }
        }
        return albums;
    }
}