using MyCode.Project.Infrastructure.Cache;
using MyCode.Project.Infrastructure.Exceptions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyCode.Project.Infrastructure.Common
{
    public static class CacheHelper
    {
        #region GetCacheValue(得到缓存中的值)
        /// <summary>
        /// 得到缓存中的值，用法： CacheHelper.GetCacheValue<long>("id",() => IdHelper.GetNewId());
        /// </summary>
        /// <typeparam name="T">要返回的对象实体</typeparam>
        /// <param name="cacheKey">缓存key</param>
        /// <param name="func">执行的函数</param>
        /// <param name="cacheSecond">多少秒，默认60</param>
        /// <returns></returns>
        public static T GetCacheValue<T>(string cacheKey,
            Func<T> func,
            int cacheSecond = 60)
        {
            if (string.IsNullOrWhiteSpace(cacheKey)) { throw new BaseException("缓存key参数cacheKey不能为空"); }

            var cache = new SystemCache();

            //该Token已经存在缓存了
            if (cache.Exists(cacheKey)) { return cache.Get<T>(cacheKey); }

            var returnValue = func.Invoke();

            if (returnValue != null) { cache.Set(cacheKey, returnValue, new TimeSpan(0, 0, cacheSecond)); }

            return returnValue;
        }
        #endregion
    }
}