DDD~WCF做中间件，实现多个项目的缓存共享

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事情是这样的，前台网站有些数据不希望每次都从数据库里读，所以，应该做个缓存，而引起缓存更新的入口来自网站的后台管理，而前台和后台被部署在不同的网站中，这时缓存的更新就成了问题，前台的缓存与后台的操作不能联系到一起，为了解决这个问题，我引入了WCF作为中间件，所以与数据库的操作，读，写都来自一个入口，那就是WCF，WCF用户告诉你是否从缓存取数据，所有缓存的数据也缓存在WCF中，OK，想法不错，下面来说一下具体的实现步骤。

一 首先看一下结构图：

注意看我的结构图，前台aop_cache和后台aop_cache_background项目都引用aop_cache_webservice项目，而它们没有对数据层aop_cache_data的引用，这个aop_cache_webservice是一个WCF项目，主要实现与数据层的通讯工作，当然也可以与BLL业务层通讯，这个架构主要是讲如何实现前后台共享缓存，而并非讲架构，所以重要不再架构，而在实现共享缓存。

二 WCF层实现所需要的DLL，主要是unity,cache,interception,log4net等，如图：

三 对于unity,wcf,cache的调用上，我进行了二次封装，如图：

四 看了这些，我们再来看一下，WEB层调用WCF层的代码片断：

        public ActionResult Index()
        {
            //  通过WCF获取远程数据,不走缓存, 走config中的<system.serviceModel>
            using (ServiceProxy<IService1> proxy = new ServiceProxy<IService1>())
            {
                return View(proxy.Channel.GetClassroom_Info());
            }
        }

web层的配置文件包含了对WCF的调用

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="ServiceProxyBinding" sendTimeout="00:10:00" receiveTimeout="00:10:00" closeTimeout="00:10:00"></binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint name="IService1" address="http://www.aop.com/Service1.svc" contract="aop_cache_WebService.IService1" binding="basicHttpBinding" bindingConfiguration="ServiceProxyBinding" />
    </client>
  </system.serviceModel>

 

五 WCF层调用DAL层的代码，使用unity来做方法拦截与依赖注入，将cache功能注入到指定方法中

        IClassroom_InfoRepository _iClassroom_InfoRepository = ServiceLocator.Instance.GetService<IClassroom_InfoRepository>();
        public void InsertClassroom_Info(Classroom_Info entity)
        {
            _iClassroom_InfoRepository.InsertClassroom_InfoData(entity);
        }

        public List<Classroom_Info> GetClassroom_Info()
        {
            return _iClassroom_InfoRepository.GetClassroom_InfoData();
        }

六 对于WCF的配置文件，我们要重要看一下，它包含了数据库连接串的配置和unity的配置

  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />

    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" />
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
    <section name="cachingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings, Microsoft.Practices.EnterpriseLibrary.Caching, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
  </configSections>
  <connectionStrings>
    <add name="DefaultConnection" providerName="System.Data.SqlClient" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-aop_cache-20131030092430;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-aop_cache-20131030092430.mdf" />
    <add name="TsingDa_NewLearningBarEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=.;initial catalog=TsingDa_NewLearningBar;user id=sa;password=zzl123;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>

  <!--BEGIN: Unity-->
  <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
    <sectionExtension type="Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension, Microsoft.Practices.Unity.Interception.Configuration" />
    <container>
      <extension type="Interception" />
      <register type="Project.Caching.ICacheProvider,  Project.Caching" mapTo="Project.Caching.EntLibCacheProvider,  Project.Caching" />
      <!--对WCF的访问进行的注入与缓存和异常的拦截-->
      <register type="aop_cache_Data.IClassroom_InfoRepository, aop_cache_Data" mapTo="aop_cache_Data.Classroom_InfoRepository, aop_cache_Data">
        <interceptor type="InterfaceInterceptor" />
        <interceptionBehavior type="Project.InterceptionBehaviors.CachingBehavior, Project.InterceptionBehaviors" />
      </register>
    </container>
  </unity>
  <!--END: Unity-->
  <!--BEGIN: Caching-->
  <cachingConfiguration defaultCacheManager="ByteartRetailCacheManager">
    <cacheManagers>
      <add name="ByteartRetailCacheManager" type="Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager, Microsoft.Practices.EnterpriseLibrary.Caching, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" expirationPollFrequencyInSeconds="600" maximumElementsInCacheBeforeScavenging="1000" numberToRemoveWhenScavenging="10" backingStoreName="NullBackingStore" />
      <!--
          expirationPollFrequencyInSeconds:过期时间(seconds)
          maximumElementsInCacheBeforeScavenging:缓冲中的最大元素数量
          numberToRemoveWhenScavenging：一次移除的数量
      -->
    </cacheManagers>
    <backingStores>
      <add type="Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.NullBackingStore, Microsoft.Practices.EnterpriseLibrary.Caching, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="NullBackingStore" />
    </backingStores>
  </cachingConfiguration>
  <!--END: Caching-->

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Practices.Unity" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Practices.Unity.Interception" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
<system.diagnostics>
    <sources>
      <source name="System.ServiceModel" switchValue="Warning" propagateActivity="true">
        <listeners>
          <add name="xml" />
        </listeners>
      </source>
    </sources>
    <sharedListeners>
      <add name="xml" type="System.Diagnostics.XmlWriterTraceListener" initializeData="d:\wcf.svclog" />
    </sharedListeners>
  </system.diagnostics>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- 为避免泄漏元数据信息，请在部署前将以下值设置为 false -->
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
          <!-- 要接收故障异常详细信息以进行调试，请将以下值设置为 true。在部署前设置为 false 以避免泄漏异常信息 -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <protocolMapping>
      <add binding="basicHttpsBinding" scheme="https" />
    </protocolMapping>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>

 

七 DAL层的实现，由接口和实现两部分组成，接口的方法上规定了是否要进行cache操作

   public interface IClassroom_InfoRepository
    {
        [Caching(CachingMethod.Remove, "GetClassroom_InfoData")]
        void InsertClassroom_InfoData(Classroom_Info entity);
        [Caching(CachingMethod.Get)]
        List<Classroom_Info> GetClassroom_InfoData();
    }

实现很简单，只是一个测试而以

   public class Classroom_InfoRepository : TsingDa_NewLearningBarRepository<Classroom_Info>, IClassroom_InfoRepository
    {
        public void InsertClassroom_InfoData(Classroom_Info entity)
        {
            base.Insert(entity);
        }
        public List<Classroom_Info> GetClassroom_InfoData()
        {
            return base.GetModel().ToList();
        }
    }

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