据说是最全的asp.NetCore3.1系统自带缓存Imemcache的滑动绝对文件依赖的测试使用

个人测试环境为：Asp.net coe 3.1 WebApi

1：封装自定义的cacheHelper帮助类，部分代码

 1   public static void SetCacheByFile<T>(string key, T model)
 2         {
 3             using (ICacheEntry entry = CreateInstans().CreateEntry(key))
 4             {
 5                 entry.Value = model;
 6                 string filepath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "cachefile.txt");
 7                 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filepath);
 8                 entry.AddExpirationToken(new Microsoft.Extensions.FileProviders.Physical.PollingFileChangeToken(fileInfo));
 9             }
10         }

View Code

2：在startUp类中注册方法：

services.AddMemoryCache();//注册使用缓存

3：测试代码

 [HttpGet, Route("DocacheByFIle")]
        public ApiResult DoSystemFileCacheTest()
        {
            ApiResult result = new ApiResult();
            try
            {
                string time = SystemCacheHelper.GetByCache<string>("Filecache");
                if (string.IsNullOrEmpty(time))
                {
                    var gettime = "你好峰哥，我是文件依赖的缓存" + DateTime.Now.ToString();
                    SystemCacheHelper.SetCacheByFile<string>("Filecache", gettime);
                    time = gettime;
                }
                result.data = time;
                result.code = statuCode.success;
                result.message = "获取cache数据成功！";
            }
            catch (Exception ex)
            {
                result.message = "发生异常:" + ex.Message;
            }
            return result;
        }

View Code

4：文件依赖过期的测试效果截图：

4.1:当文件没有被修改，多次刷新请求，缓存的数据没有变化，到达了效果

4.2:当文件内容有修改，重新请求接口发现缓存的数据有变化，到达了预期的效果

5：其他的测试也ok，这里就不贴出来了，下面为全部的cacheHelper帮助类的代码：

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Threading.Tasks;
  5 
  6 namespace ZRFCoreTestMongoDB.Commoms
  7 {
  8     using Microsoft.Extensions.Caching.Memory;
  9     using Microsoft.Extensions.Options;
 10     using ZRFCoreTestMongoDB.Model;
 11     /// <summary>
 12     /// auth @ zrf  2020-07-23
 13     /// </summary>
 14     public class SystemCacheHelper
 15     {
 16         private static IMemoryCache msCache = null;// new MemoryCache(Options.Create(new MemoryCacheOptions()));
 17         private static readonly object obj = new object();
 18         //static SystemCacheHelper()
 19         //{
 20         //    msCache = new MemoryCache(Options.Create(new MemoryCacheOptions()));
 21         //}
 22         public static IMemoryCache CreateInstans()
 23         {
 24             if (msCache == null)
 25             {
 26                 lock (obj)
 27                 {
 28                     if (msCache == null)
 29                     {
 30                         msCache = new MemoryCache(Options.Create(new MemoryCacheOptions()));
 31                     }
 32                 }
 33             }
 34             return msCache;
 35         }
 36 
 37         /// <summary>
 38         /// 滑动过期/绝对过期
 39         /// </summary>
 40         /// <typeparam name="T"></typeparam>
 41         /// <param name="key"></param>
 42         /// <param name="model"></param>
 43         /// <param name="hd_ab">默认true ：绝对过期，否则滑动过期</param>
 44         /// <param name="Minutes"></param>
 45         public static void SetCache<T>(string key, T model, bool hd_ab = true, int minutes = 3)
 46         {
 47             using (ICacheEntry entry = CreateInstans().CreateEntry(key))
 48             {
 49                 entry.Value = model;
 50                 if (hd_ab)
 51                 {
 52                     entry.AbsoluteExpiration = DateTime.Now.AddMinutes(minutes);
 53                 }
 54                 else
 55                 {
 56                     entry.SlidingExpiration = TimeSpan.FromMinutes(minutes);
 57                 }
 58             }
 59         }
 60 
 61         /// <summary>
 62         /// 文件依赖过期
 63         /// </summary>
 64         /// <typeparam name="T"></typeparam>
 65         /// <param name="key"></param>
 66         /// <param name="model"></param>
 67         public static void SetCacheByFile<T>(string key, T model)
 68         {
 69             using (ICacheEntry entry = CreateInstans().CreateEntry(key))
 70             {
 71                 entry.Value = model;
 72                 string filepath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "cachefile.txt");
 73                 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filepath);
 74                 entry.AddExpirationToken(new Microsoft.Extensions.FileProviders.Physical.PollingFileChangeToken(fileInfo));
 75             }
 76         }
 77 
 78         /// <summary>
 79         /// 滑动过期
 80         /// </summary>
 81         /// <typeparam name="T"></typeparam>
 82         /// <param name="key"></param>
 83         /// <param name="model"></param>
 84         /// <param name="Minutes"></param>
 85         public static void SetCacheSliding<T>(string key, T model, int minutes = 3)
 86         {
 87             using (ICacheEntry entry = CreateInstans().CreateEntry(key))
 88             {
 89                 entry.Value = model;
 90                 entry.SlidingExpiration = TimeSpan.FromMinutes(minutes);
 91             }
 92         }
 93 
 94         /// <summary>
 95         /// 绝对过期
 96         /// </summary>
 97         /// <typeparam name="T"></typeparam>
 98         /// <param name="key"></param>
 99         /// <param name="model"></param>
100         /// <param name="Minutes"></param>
101         public static void SetCacheAbsolute<T>(string key, T model, int Minutes = 3)
102         {
103             using (ICacheEntry entry = CreateInstans().CreateEntry(key))
104             {
105                 entry.Value = model;
106                 entry.AbsoluteExpiration = DateTime.Now.AddMinutes(Minutes);
107             }
108         }
109         public static T GetByCache<T>(string key)
110         {
111             if (CreateInstans().TryGetValue(key, out T model))
112             {
113                 return model;
114             }
115             return default;
116         }
117     }
118 }

View Code

6：进一步使用到自定义的配置文件中

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

namespace ZRFCoreTestMongoDB.Commoms
{
    using ZRFCoreTestMongoDB.Model;
    using Microsoft.Extensions.Configuration;
    public class AppJsonHelper
    {
        public static JwtConfigModel InitJsonModel()
        {
            string key = "key_myjsonfilekey";
            JwtConfigModel cachemodel = SystemCacheHelper.GetByCache<JwtConfigModel>(key);
            if (cachemodel == null)
            {
                ConfigurationBuilder builder = new ConfigurationBuilder();
                var broot = builder.AddJsonFile("./configs/zrfjwt.json").Build();
                cachemodel = broot.GetSection("jwtconfig").Get<JwtConfigModel>();
                SystemCacheHelper.SetCacheByFile<JwtConfigModel>(key, cachemodel);
            }
            return cachemodel;
        }
    }
}

View Code

7：模型

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

namespace ZRFCoreTestMongoDB.Model
{
    public class JwtConfigModel
    {
        public string TockenSecrete { get; set; }
        public string Issuer { get; set; }
        public string Audience { get; set; }
    }
}

8：测试完整代码：

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Threading.Tasks;
 5 
 6 namespace ZRFCoreTestMongoDB.Controllers
 7 {
 8     using Microsoft.AspNetCore.Authorization;
 9     using Microsoft.AspNetCore.Mvc.Filters;
10     using Microsoft.AspNetCore.Mvc;
11     using ZRFCoreTestMongoDB.Model;
12     using ZRFCoreTestMongoDB.Commoms;
13     [ApiController]
14     [Route("api/[Controller]")]
15     public class MyJwtTestController : ControllerBase
16     {
17         private readonly JwtConfigModel _jsonmodel;
18         public MyJwtTestController()
19         {
20             _jsonmodel = AppJsonHelper.InitJsonModel();
21         }
22         [HttpGet, Route("jsonmodel")]
23         public ApiResult DoMyselfJsonTest()
24         {
25             ApiResult result = new ApiResult();
26             try
27             {
28                 result.data = _jsonmodel;
29                 result.code = statuCode.success;
30                 result.message = "获取数据成功！";
31             }
32             catch (Exception ex)
33             {
34                 result.message = "发生异常:" + ex.Message;
35             }
36             return result;
37         }
38         [HttpGet, Route("testcache")]
39         public ApiResult DoSystemCacheTest()
40         {
41             ApiResult result = new ApiResult();
42             try
43             {
44                 string time = SystemCacheHelper.GetByCache<string>("nowtime");
45                 if (string.IsNullOrEmpty(time))
46                 {
47                     var gettime = "为：" + DateTime.Now.ToString();
48                     SystemCacheHelper.SetCache<string>("nowtime", gettime, minutes: 1);
49                     time = gettime;
50                 }
51                 result.data = time;
52                 result.code = statuCode.success;
53                 result.message = "获取cache数据成功！";
54             }
55             catch (Exception ex)
56             {
57                 result.message = "发生异常:" + ex.Message;
58             }
59             return result;
60         }
61         [HttpGet, Route("DocacheByFIle")]
62         public ApiResult DoSystemFileCacheTest()
63         {
64             ApiResult result = new ApiResult();
65             try
66             {
67                 string time = SystemCacheHelper.GetByCache<string>("Filecache");
68                 if (string.IsNullOrEmpty(time))
69                 {
70                     var gettime = "你好峰哥，我是文件依赖的缓存" + DateTime.Now.ToString();
71                     SystemCacheHelper.SetCacheByFile<string>("Filecache", gettime);
72                     time = gettime;
73                 }
74                 result.data = time;
75                 result.code = statuCode.success;
76                 result.message = "获取cache数据成功！";
77             }
78             catch (Exception ex)
79             {
80                 result.message = "发生异常:" + ex.Message;
81             }
82             return result;
83         }
84     }
85 }

View Code

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Threading.Tasks;
 5 
 6 namespace ZRFCoreTestMongoDB.Commoms
 7 {
 8     using ZRFCoreTestMongoDB.Model;
 9     using Microsoft.Extensions.Configuration;
10     public class AppJsonHelper
11     {
12         public static JwtConfigModel InitJsonModel()
13         {
14             string key = "key_myjsonfilekey";
15             JwtConfigModel cachemodel = SystemCacheHelper.GetByCache<JwtConfigModel>(key);
16             if (cachemodel == null)
17             {
18                 ConfigurationBuilder builder = new ConfigurationBuilder();
19                 var broot = builder.AddJsonFile("./configs/zrfjwt.json").Build();
20                 cachemodel = broot.GetSection("jwtconfig").Get<JwtConfigModel>();
21                 SystemCacheHelper.SetCacheByFile<JwtConfigModel>(key, cachemodel);
22             }
23             return cachemodel;
24         }
25     }
26 }

View Code

相关阅读:
「ZJOI2019」开关
 「ZJOI2019」Minimax 搜索
 杨氏矩阵学习笔记
 「LibreOJ NOI Round #2」简单算术
 「LibreOJ NOI Round #2」小球进洞
 组合总和 II（力扣第40题）
组合总和 I（力扣第39题）
组合（力扣第77题）
使用MapReduce解决蚂蚁森林第二题
 Hive练习--蚂蚁森林习题二
原文地址：https://www.cnblogs.com/Fengge518/p/13366351.html