【转载】Memcached Tip 2：Session同步

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