【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：

<?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