using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Caching.Memory;

namespace RB_MES_API.Context
{
    /// <summary>
    /// 缓存处理
    /// </summary>
    public class CacheHelper
    {
        //public CacheHelper Defalut=new CacheHelper();
        private static IMemoryCache _cache =new MemoryCache(new MemoryCacheOptions());
        /// <summary>
        /// 读取缓存
        /// </summary>
        /// <param name="cacheKey"></param>
        /// <returns></returns>
        public static T GetCache<T>(string cacheKey)
        {            
            if(string.IsNullOrEmpty(cacheKey))
            {
                throw new ArgumentNullException(nameof(cacheKey));
            }
            T cache;
            _cache.TryGetValue(cacheKey, out cache);
            return cache;
        }
        /// <summary>
        /// 设置缓存（滑动过期）
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key">关键字</param>
        /// <param name="value">缓存值</param>
        public static void Set_AbsluteExpire<T>(string key,T value)
        {
            if (string.IsNullOrEmpty(key))
            {
                throw new ArgumentNullException(nameof(key));
            }
            T v;
            if(_cache.TryGetValue(key, out v))
            {
                _cache.Remove(key);
            }
            _cache.Set(key, value, TimeSpan.FromMinutes(20));
        }
        /// <summary>
        /// 移除缓存
        /// </summary>
        /// <param name="key"></param>
        public static void Remove(string key)
        {
            if (string.IsNullOrEmpty(key))
            {
                throw new ArgumentNullException(nameof(key));
            }
            _cache.Remove(key);
        }

        public void Dispose()
        {
            if(_cache != null) { _cache.Dispose(); }
            GC.SuppressFinalize(this);
        }
    }
}