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这篇文章将为大家详细讲解有关如何使用Enyim.Caching访问Memcached,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
(1)首先下载EnyimMemcached(文件名:EnyimMemcached-master.zip)。
进入网址https://github.com/enyim ,可以看到如下界面,并选择“EnyimMemcached”
进入如下页面,或者直接访问:https://github.com/enyim/EnyimMemcached,点击右侧的“Download ZIP”,得到文件“EnyimMemcached-master.zip”
(2)将“EnyimMemcached-master.zip”解压出来,如下图
注:我们可以用“*.dll”进行搜索一下,发现并没有Enyim.Caching.dll,所以需要我们自己生成。
用Visual Studio 2010打开“Enyim.Caching.sln”文件
在打开的过程中,我遇到了(好几次)下面的提示,以我目前的水平,还不能确切的明白 “这个提示到底会发生什么事情”,所以我将它忽略了,如果有明白的朋友,可以告诉我啊
直接,我们按一下F6(生成解决方案),会发现如下错误
针对上面的问题,我们可以查看右侧的“解决方案资源管理器”内各个项目的引用信息,发现
-->Enyim.Caching.Log4NetAdaper项目中log4net的引用丢失
-->MemcachedTest项目中nuit.framework、nuit.mocks的引用丢失
对于这个问题,我们可以Nuget来解决一下
再看一下,发现错误更多,如下图,发现原来是“NUit的命名空间没有找到”
再用Nuget解决一下这个NUnit的问题,搜索nunit.mocks,安装一下,再按F6(生成解决方案),发现成功了。
(3)生成Enyim.Caching.dll的Release版本,在Enyim.Caching的Bin\Release目录下找到Enyim.Caching.dll文件
Enyim.Caching\bin\Release
(4)新建一个“控制台应用程序”,将Enyim.Caching.dll放到项目的bin目录下
LearningEnyimMemcached\bin
添加Enyim.Caching的引用
(5)添加一个“应用程序配置文件”,文件名是App.config
App.config中的配置如下
<?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <sectionGroup name="enyim.com"> <section name="memcached" type="Enyim.Caching.Configuration.MemcachedClientSection, Enyim.Caching" /> </sectionGroup> </configSections> <enyim.com> <memcached protocol="Binary"> <servers> <!-- make sure you use the same ordering of nodes in every configuration you have --> <add address="192.168.100.85" port="11211" /> <add address="192.168.100.63" port="11211" /> </servers> <socketPool minPoolSize="10" maxPoolSize="20" connectionTimeout="00:00:10" deadTimeout="00:00:10" /> <keyTransformer type="Enyim.Caching.Memcached.TigerHashKeyTransformer, Enyim.Caching" /> </memcached> </enyim.com> </configuration>
(6)Program.cs文件中的代码
如下
using System; using Enyim.Caching; using Enyim.Caching.Memcached; namespace LearningEnyimMemcached { class Program { static void Main(string[] args) { // create a MemcachedClient in your application // you can cache the client in a static variable or just recreate it every time MemcachedClient mc = new MemcachedClient(); // store a string in the cache mc.Store(StoreMode.Set, "MyKey", "Hello"); // retrieve the item from the cache Console.WriteLine(mc.Get("MyKey")); // store some other items mc.Store(StoreMode.Set, "D1", 1234L); mc.Store(StoreMode.Set, "D2", DateTime.Now); mc.Store(StoreMode.Set, "D3", true); mc.Store(StoreMode.Set, "D4", new Product()); mc.Store(StoreMode.Set, "D5", new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }); Console.WriteLine("D1: {0}", mc.Get("D1")); Console.WriteLine("D2: {0}", mc.Get("D2")); Console.WriteLine("D3: {0}", mc.Get("D3")); Console.WriteLine("D4: {0}", mc.Get("D4")); byte[] tmp = mc.Get<byte[]>("D5"); // delete them from the cache mc.Remove("D1"); mc.Remove("D2"); mc.Remove("D3"); mc.Remove("D4"); // add an item which is valid for 10 mins mc.Store(StoreMode.Set, "D4", new Product(), new TimeSpan(0, 10, 0)); Console.WriteLine("D4: {0}", mc.Get("D4")); Console.ReadLine(); } // objects must be serializable to be able to store them in the cache [Serializable] class Product { public double Price = 1.24; public string Name = "Mineral Water"; public override string ToString() { return String.Format("Product {{{0}: {1}}}", this.Name, this.Price); } } } }
再按一下F6,发现有11个错误,说是“未能找到Enyim的命名空间”,可是,我已经添加了Enyim.Caching的引用了。
针对这个问题,打开项目的属性,将项目的“目标框架”(由原来的.NET Framework 4 Client Profile)改成“.NET Framework 4”,再按F6(生成解决方案),就成功了。
按F5(启动调试),看到如下结果
(7)上面的代码确实能够运行,但是如果对自己要求更高一些,应该这样写
using(MemcachedClient client = new MemcachedClient()) { // Store the record client.Store(StoreMode.Set, "currentTime", DateTime.Now.ToString()); // Retrieve the value string value = client.Get<string>("currentTime"); }
因为MemcachedClient类实现了IDisposable接口
参考网址:http://deanhume.com/home/blogpost/memcached-for-c----a-walkthrough/62
同样,在这篇文章中,作者也写了一个CacheLayer.cs文件,对MemcachedClient进行了封装(a little wrapper),但是有一个问题需要注意:作者的写的这个CacheLayer.cs类只能够在Northscale的1.4.5版本的Memcached下正常运行。
CacheLayer.cs的代码如下
namespace MemcacheExample.Cache { using System; using Enyim.Caching; using Enyim.Caching.Memcached; public class CacheLayer { private static readonly MemcachedClient Cache = new MemcachedClient(); /// <summary> /// Retrieve cached item /// </summary> /// <typeparam name="T">Type of cached item</typeparam> /// <param name="key">Name of cached item</param> /// <returns>Cached item as type</returns> public static T Get<T>(string key) where T : class { try { return (T) Cache.Get(key); } catch { return null; } } /// <summary> /// Insert value into the cache using /// appropriate name/value pairs /// </summary> /// <typeparam name="T">Type of cached item</typeparam> /// <param name="objectToCache">Item to be cached</param> /// <param name="key">Name of item</param> /// <param name="cacheDuration">Duration of the cache.</param> public static void Add<T>(T objectToCache, string key, int cacheDuration) where T : class { Cache.Store(StoreMode.Set, key, objectToCache, DateTime.Now.AddMinutes(cacheDuration)); } /// <summary> /// Insert value into the cache using /// appropriate name/value pairs /// </summary> /// <param name="objectToCache">Item to be cached</param> /// <param name="key">Name of item</param> /// <param name="cacheDuration">Duration of the cache.</param> public static void Add(object objectToCache, string key, int cacheDuration) { Cache.Store(StoreMode.Set, key, objectToCache, DateTime.Now.AddMinutes(cacheDuration)); } /// <summary> /// Remove item from cache /// </summary> /// <param name="key">Name of cached item</param> public static void Remove(string key) { Cache.Remove(key); } /// <summary> /// Clears all stored objects from memory. /// </summary> public static void ClearAll() { Cache.FlushAll(); } /// <summary> /// Check for item in cache /// </summary> /// <param name="key">Name of cached item</param> /// <returns>A boolean if the object exists</returns> public static bool Exists(string key) { return Cache.Get(key) != null; } } }
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