cache

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Web;

namespace BrewSite.Util
{
    public static class HttpApplicationStateBaseExtension
    {
        public static async Task<T> CacheAside<T>(this HttpApplicationStateBase app, string key, double ttl, Func<Task<T>> exec)
            where T : class, ICache
        {
            T tmp = app[key] as T;

            if (tmp == null || DateTime.Now >  tmp.CachedAt.AddMinutes(ttl))
            {
                tmp = await exec.Invoke();
                app[key] = tmp;
            }

            return tmp;

        }
    }
}