memcached实例
在上一篇文章，我们讲了，为什么要使用memched做为缓存服务器（没看的同学请点这里）。下面让我们以memcached-1.2.1-win32版本的服务组件(安装后是以一个windows服务做daemon)和C#API(Enyim.Caching)为基础，做一个"Hello world"级的程序，让我们真正感受到memcached就在我们身边。后一的文章，我们还讲memcached的核心部分（根据key来hash存取数据，缓存数据在server端的内存存储结构）和一些好的案例。
下面的实例实现的功能很简单，根据key来存取一个object对象（要支持Serializable才行哦），因为服务器端数据都是byte型的数据组实现存在。
服务的启动：
１， 将memcached-1.2.1-win32.zip解决到指定的地方，如c:\memcached
２， 命令行输入 'c:\memcached\memcached.exe -d install'
３， 命令行输入 'c:\memcached\memcached.exe -d start' ，该命令启动 Memcached，默认监听端口为 11211
可以通过 memcached.exe -h 可以查看其帮助
第一步：配置config文件
<configuration>
<configSections>
<sectionGroup name="enyim.com">
<section name="memcached" type="Enyim.Caching.Configuration.MemcachedClientSection, Enyim.Caching" />
</sectionGroup>
<section name="memcached" type="Enyim.Caching.Configuration.MemcachedClientSection, Enyim.Caching" />
</configSections>
<enyim.com>
<memcached>
<servers>
<!-- put your own server(s) here-->
<add address="127.0.0.1" port="11211" />
</servers>
<socketPool minPoolSize="10" maxPoolSize="100" connectionTimeout="00:00:10" deadTimeout="00:02:00" />
</memcached>
</enyim.com>
<memcached keyTransformer="Enyim.Caching.TigerHashTransformer, Enyim.Caching">
<servers>
<add address="127.0.0.1" port="11211" />
</servers>
<socketPool minPoolSize="2" maxPoolSize="100" connectionTimeout="00:00:10" deadTimeout="00:02:00" />
</memcached>
</configuration>
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或者在solution中加入这个project(可以下载的代码中找到)。
基础代码如下：
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.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<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.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);
}
}
}
}
Server和Client API及实例代码下载（在Enyim Memcached 1.2.0.2版本上的修改）
下载memcached服务安装地址：http://www.danga.com/memcached/
Client API下载地址：http://www.danga.com/memcached/apis.bml
