memcached缓存机制+微软缓存机制使用详解
1、 why Memcached1.1 一台web服务器上，iis接收的请求数是有限的，当访问量超大的时候，网站访问就会遇到瓶颈了，处理方式就是运用多了服务器把请求数分流（集群），对外公布的就一个公共的ip。
1.2 当数据访问量有10w时候，通过3台服务器分流请求，每台即承担了3.3w个请求，当用户登录的时候，如何共享登录信息就成为需要解决的问题（如把登录信息放到数据库中，性能会很差），这就是分布式缓存的运用场景。
2、 Memcached基本介绍
2.1 key最大：255字节，value最大：1m，{key:key1,value:123}
3、Windows下使用Memcache
3.1 下载memcache：www.code.jellycan.com/Memcache
3.2 安装服务：cmd---Memcached.exe –d install
3.3 启动服务：cmd---Memcached.exe –d start (restart 重启，stop关闭)
3.4 检查服务是否启动：连接到Memcache控制台：telnet 127.0.0.1 11211，回车，输入命令：stats 检查当前服务状态。
3.5 卸载Memcached.exe –d uninstall
遇到问题：如无法启动此程序，解决方法：下载MSVCR71.dll，安装上即可。
3.6 增删改查输命令方式
3.6.1 add keyname 0 0 5 回车 //第一个0是一个数字，第二个是过期时间，单位秒，0表示不限期，5表示value长度，如keyname存在，则不做操作
12345 //value内容
3.6.2 get keyname //得到相应的value的值
3.6.3 delete keyname //删除
3.6.4 set keyname 0 0 5 回车 //如果没有则添加，如有就更新
12345
3、 c#下操作memcache
4、 微软缓存方式
demo
业务逻辑层：
接口：ICacheManager
1 public interface ICacheManager
2 {
3 object Get(string key);
4 void Set(string key, object value);
5 void Set(string key, object value, int timeout);
6 void Remove(string key);
7 void RemoveAll();
8 }
CacheFactory类：
1 public class CacheFactory
2 {
3 private static ICacheManager _instance = null;
4 private static object m_LockObj = new object();
5 private CacheFactory() { }
6 static CacheFactory()
7 {
8 GetInstance();
9 }
10 public static ICacheManager GetInstance()
11 {
12 if (_instance == null)
13 {
14 lock (m_LockObj)
15 {
16 if (_instance == null)
17 {
18 string cacheType = ConfigurationSettings.AppSettings["CacheType"];
19 if (cacheType == "MemCacheManager")
20 _instance = new MemCachedManager();
21 else
22 _instance = new MsCacheManager();
23 }
24 }
25 }
26 return _instance;
27 }
28 }
MemCachedManager类：
1 public class MemCachedManager: ICacheManager
2 {
3 private MemcachedClient m_CacheManager;
4
5 public MemCachedManager()
6 {
7 m_CacheManager = MemcachedClient.GetInstance("CachePS");
8 }
9 public void Set(string key, object value)
10 {
11 m_CacheManager.Set(key, value);
12 }
13 public void Set(string key, object value, int timeout)
14 {
15 m_CacheManager.Set(key, value, DateTime.Now.AddMinutes(timeout));
16 }
17 public object Get(string key)
18 {
19 return m_CacheManager.Get(key);
20 }
21 public void Remove(string key)
22 {
23 m_CacheManager.Delete(key);
24 }
25 public void RemoveAll()
26 {
27 m_CacheManager.FlushAll();
28 }
29 }
MsCacheManager类：
1 public class MsCacheManager : ICacheManager
2 {
3 private BaseCacheDAL m_CacheManager;
4
5 public MsCacheManager()
6 {
7 m_CacheManager = new BaseCacheDAL("CachePS");
8 }
9
10 public object Get(string key)
11 {
12 return m_CacheManager.GetCache(key);
13 }
14
15 public void Set(string key, object value)
16 {
17 m_CacheManager.SetCache(key, value, 0);
18 }
19
20 public void Set(string key, object value, int timeout)
21 {
22 m_CacheManager.SetCache(key, value, timeout);
23 }
24
25 public void Remove(string key)
26 {
27 m_CacheManager.Remove(key);
28 }
29
30 public void RemoveAll()
31 {
32 m_CacheManager.RemoveAll();
33 }
34 }
调用：
1public static DataTable GetCarPList(int UserId)
2 {
3 DataTable dt;
4 dt = cacheManger.Get(CacheKey.GetCarPList_Key()) as DataTable;
5 if (dt == null)
6 {
7 string sql = string.Format("select C.CarId,C.ProId,C.UserId,C.BuyNumber,P.ProName,P.Price,P.ProImage,P.Stockfrom Car C inner join Product P on C.ProId=P.ProId where C.UserId={0}", UserId);
8 dt = SqlHelper.ExecuteDataTable(com.Model.Base.DataBaseEnum.ruanmou, sql, CommandType.Text, null);
9 cacheManger.Set(CacheKey.GetCarPList_Key(), dt, 60);
10 }
11 return dt;
12 }
web.config重要节点配置：
1 <appSettings>
2 <add key="CacheType" value="MsCacheManager"/>
3 <!--<add key="CacheType" value="MemCacheManager"/>-->
4 </appSettings>
1 <configSections>
2 <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
3 <section name="cachingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
4 <section name="enterpriseLibrary.ConfigurationSource" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ConfigurationSourceSection, Microsoft.Practices.EnterpriseLibrary.Common, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
5 <section name="memcachedgarden" type="System.Configuration.NameValueSectionHandler"/>
6 </configSections>
1 <cachingConfiguration defaultCacheManager="CachePS">
2 <cacheManagers>
3 <add expirationPollFrequencyInSeconds="120" maximumElementsInCacheBeforeScavenging="1000" numberToRemoveWhenScavenging="10" backingStoreName="Null Storage" type="Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="CachePS"/>
4 </cacheManagers>
5 <backingStores>
6 <add encryptionProviderName="" type="Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.NullBackingStore, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="Null Storage"/>
7 </backingStores>
8 </cachingConfiguration>
9 <enterpriseLibrary.ConfigurationSource selectedSource="System Configuration Source">
10 <sources>
11 <add name="System Configuration Source" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.SystemConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
12 </sources>
13 </enterpriseLibrary.ConfigurationSource>
14 <memcachedgarden>
15 <add key="CachePS" value="127.0.0.1:11211"/>
16 </memcachedgarden>
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