Memcached Tip 2：Session同步

huhahapz

　　http://memcachedproviders.codeplex.com/提供的Memcached客户端支持Asp.net站点中的Session同步，其原理是接管Asp.net的Session处理，同时在后台使用数据库支持完成WEB集群的Session的同步。具体实现步骤如下：
　　1：数据库准备
　　下载完毕Memcached providers之后，在解压目录下有：

　　一个用于创建数据库表，一个用于创建这个provider的需要用到的存储过程。
　　2：配置sessionState
　　sessionState的配置如下，为了完整性期间，这里给出Web.config的全部配置部分，包括分布式缓存的Memcached的配置：

<?xml version="1.0"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<configSections>
<section name="cacheProvider" type="MemcachedProviders.Cache.CacheProviderSection,  MemcachedProviders" allowDefinition="MachineToApplication" restartOnExternalChanges="true"/>
<sectionGroup name="enyim.com">
<section name="memcached" type="Enyim.Caching.Configuration.MemcachedClientSection, Enyim.Caching" />
</sectionGroup>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
</configSections>
<log4net>
<!-- Define some output appenders -->
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}]
- %message%newline" />
</layout>
</appender>
<!--<threshold value="OFF" />-->
<!-- Setup the root category, add the appenders and set the default priority -->
<root>
<priority value="WARN"/>
<appender-ref ref="ConsoleAppender">
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="WARN"/>
<levelMax value="FATAL"/>
</filter>
</appender-ref>
</root>
</log4net>
<enyim.com>
<memcached>
<servers>
<!-- put your own server(s) here-->
<add address="192.168.0.96" port="11211" />
<!--<add address="192.168.0.101" port="11211" />-->
</servers>
<socketPool minPoolSize="10" maxPoolSize="100"
connectionTimeout="00:00:10" deadTimeout="00:02:00" />
</memcached>
</enyim.com>
<cacheProvider defaultProvider="MemcachedCacheProvider">
<providers>
<add name="MemcachedCacheProvider"
type="MemcachedProviders.Cache.MemcachedCacheProvider, MemcachedProviders"
keySuffix="_MySuffix_" defaultExpireTime="2000"/>
</providers>
</cacheProvider>
<connectionStrings>
<add name="ApplicationServices"
connectionString="Data Source=192.168.0.96;Initial Catalog=ForestFire;User Id=sa;Password=sa;"
providerName="System.Data.SqlClient" />
</connectionStrings>
<system.web>
<sessionState cookieless="false" regenerateExpiredSessionId="true" mode="Custom"
customProvider="MemcachedSessionProvider">
<providers>
<add name="MemcachedSessionProvider" type="MemcachedProviders.Session.SessionStateProvider,MemcachedProviders" connectionStringName="ApplicationServices" dbType="SQL" writeExceptionsToEventLog="false"   />
</providers>
</sessionState>
<compilation debug="true" targetFramework="4.0" />
<authentication mode="Forms">
<forms loginUrl="~/Account/Login.aspx" timeout="2880" />
</authentication>
<membership>
<providers>
<clear/>
<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"
enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false"
maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
applicationName="/" />
</providers>
</membership>
<profile>
<providers>
<clear/>
<add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
</providers>
</profile>
<roleManager enabled="false">
<providers>
<clear/>
<add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
<add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
</providers>
</roleManager>
</system.web>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>
　　3：代码
　　代码没有任何稀奇的，和传统的Session操作一样，如下：

        protected void Page_Load(object sender, EventArgs e)
{
try
{
Session["name"] = "豆腐";
}
catch (Exception err)
{
Response.Write(err.Message);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = Session["name"].ToString();
}
　　全部代码下载如下：WebApplication20110817.rar