C#使用memcached高速缓存

  Memcached 是开源高性能分布式缓存组件,目前已经广泛应用各类互联网领域. 具有多种语言的客户端开发包，包括：Perl/PHP/JAVA/C/Python/Ruby/C#/MySQL. 这此站点已经在使用YouTube,Reddit,Zynga,Facebook,Orange它. 看
下面的图比较形象.

同样它也是扩平台的,今天我们来看windows下的服务端以及使用.net的客户端访问它.我们
选择了Enyim Memcached这个客户端. 
首先,我们安装windows版的服务端,你可以从这个站点下载. 安装时使用命令行:

memcached.exe –d install

memcached.exe -d start 该命令启动 Memcached，默认监听端口为 11211
memcached.exe -p 端口号 自行设置监听端口

这样将Windows service中创建一个memcached的服务. 同样你可以使用 –d uninstall 来卸载它. 运行时将默认监听11211
IP:127.0.0.1,如下图所示:

接着创建一个控制台程序引用Enyim.Caching.dll, 并在配置文件:

   1:  <configuration>

   2:    <configSections>

   3:      <sectionGroup name="enyim.com">

   4:        <section name="memcached" type="Enyim.Caching.Configuration.MemcachedClientSection, Enyim.Caching"/>

   5:      sectionGroup>

   6:    configSections>

   7:    <enyim.com>

   8:      <memcached protocol="Binary">

   9:        <servers>

  10:          <add address="127.0.0.1" port="11211"/>

  11:        servers>

  12:      memcached>

  13:    enyim.com>

  14:    configuration>

测试一下:

   1:              using (var mc = new MemcachedClient())

   2:              {

   3:                  mc.Store(StoreMode.Set, "mytime", DateTime.Now.ToString());

   4:                  string temp = mc.Get<string>("mytime");

   5:   

   6:                  Console.Write(temp);

   7:                  Console.Read();

   8:              }

示例2：

配置config文件

这里的port:11211是, memcached-1.2.1-win32在安装时默认使用的port.当然你可以用memcached.exe -p 端口号来自行设置。

第二步， 新建TestMemcachedApp的console project

引用Enyim.Caching.dll

基础代码如下：

//create a instance of MemcachedClient
MemcachedClient mc = new MemcachedClient();
// store a string in the cache
mc.Store(StoreMode.Set, "MyKey", "Hello World");
// retrieve the item from the cache
Console.WriteLine(mc.Get("MyKey"));

完整代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using Enyim.Caching;
using Enyim.Caching.Memcached;
using System.Net;
using Enyim.Caching.Configuration;

namespace DemoApp
{
    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 World");

            // 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("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.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);
            }
        }
    }
}