【转载】Memcached Tip 2：Session同步

sfyhip

　　http://www.cnblogs.com/luminji/archive/2011/08/17/2143371.html
　　
　　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：



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<?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：



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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