LazyCache Example

HomPageService.cs

public class HomePageService
{
    public static string HomeModelCacheKey = "HomeModel";
    private static TimeSpan cacheExpiry = new TimeSpan(12, 0, 0); //12 hours

    private readonly PositionsGroupedByTagQuery positionsGroupedByTagQuery;
    private readonly IAppCache cache;

    public HomePageService(PositionsGroupedByTagQuery positionsGroupedByTagQuery, IAppCache cache)
    {
        this.positionsGroupedByTagQuery = positionsGroupedByTagQuery;
        this.cache = cache;
    }

    public async Task<HomeModel> GetHomeModel(string tag, bool bustCache = false)
    {
        if (bustCache) ClearHomePageCache();

        var model = await cache.GetOrAddAsync(HomeModelCacheKey, async () =>
        {
            return new HomeModel()
            {
                GroupedLatestListings = await positionsGroupedByTagQuery.Execute(tag)
            };
        }, cacheExpiry);             
        
        return model;
    }

    public void ClearHomePageCache() => cache.Remove(HomeModelCacheKey);
}