using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Extensions.Caching.Memory;

namespace TelpoPush.Service.Cache
{
    internal class MemoryCacheUtil
    {
            static MemoryCache cache = new MemoryCache(new MemoryCacheOptions());
            /// <summary>
            /// 创建缓存项的文件
            /// </summary>
            /// <param name="key">缓存Key</param>
            /// <param name="obj">object对象</param>
            public static void Set(string key, object value)
            {
                if (key != null)
                {
                    cache.Set(key, value);
                }
            }
            /// <summary>
            /// 创建缓存项过期
            /// </summary>
            /// <param name="key">缓存Key</param>
            /// <param name="obj">object对象</param>
            /// <param name="expires">过期时间(秒)</param>
            public static void Set(string key, object value, int expires)
            {
                if (key != null)
                {
                    cache.Set(key, value, new MemoryCacheEntryOptions()
                        //设置缓存时间，如果被访问重置缓存时间。设置相对过期时间x秒
                        .SetSlidingExpiration(TimeSpan.FromSeconds(expires)));
                }
            }

            /// <summary>
            /// 获取缓存对象
            /// </summary>
            /// <param name="key">缓存Key</param>
            /// <returns>object对象</returns>
            public static object Get(string key)
            {
                object val = null;
                if (key != null && cache.TryGetValue(key, out val))
                {

                    return val;
                }
                else
                {
                    return default(object);
                }
            }

            /// <summary>
            /// 获取缓存对象
            /// </summary>
            /// <typeparam name="T">T对象</typeparam>
            /// <param name="key">缓存Key</param>
            /// <returns></returns>
            public static T Get<T>(string key)
            {
                object obj = Get(key);
                return obj == null ? default(T) : (T)obj;
            }


            /// <summary>
            /// 移除缓存项的文件
            /// </summary>
            /// <param name="key">缓存Key</param>
            public static void Remove(string key)
            {
                cache.Remove(key);
            }
        }
    }