WCF利用企業庫Unity框架的IOC層次解耦

本文轉載自查看原文 2012-02-07 23:23 5425 AOP/IOC/ WCF/Remoting/Communications Infrastructure/ WCF/ IOC

由於工作幾個月來框架開發已經好久沒寫博客了，今天想抽點時間出來冒泡。在領域驅動開發中SOA已經成為我們開發的主流技術，在面對當前眾多的UI框架選擇（asp.net mvc,silverlight,wpf,winform,wp7等一些列甚至跨語言），我們能夠重用和抽象的業務邏輯是不會變化的，為了屏蔽這些UI的復雜性和差異性，我們可能會采用諸如wcf soap的服務發布。再說在領域驅動開發中我們肯定會把各個邏輯分層次隔離解除耦合，這就出現了N層架構，在於我們的每一層次之間的耦合度當前流程的解決方案IOC框架，以及業務解耦AOP。這里要解決的是SOA框架WCF和IOC框架的結合。

WCF框架是一個極易擴展的框架，提供了非常多的擴展點（InstanceProvider，MessageInspector，CallContextInitializer，MessageFilter，MessageFormatter，ParameterInspector等等）。在這里IOC是作為一個容器組裝創建的框架，我們需要的是對服務對象的創建，所以我們選擇的當然是InstanceProvider擴展點。

多說一句廢話，正如前篇利用Attribute簡化Unity框架IOC注入和 AOP之PostSharp7-解決IOC 不能直接new問題，簡化IOC開發和IOC對象LazyLoad中所說，我是一個固執的人，個人希望注入支持自定義配置文件，不喜歡把配置信息全部寫在一個web.config/app.config中，也不喜歡el的寫在同一個外部配置文件中，傾向於每個模塊在一個不同的配置文件，並在模塊中在區分container容器，所以特別寫了每個單獨配置文件的延時加載，緩存。

下面就是對InstanceProvider的擴展：

View Code

public class ELUnityInstanceProvider : IInstanceProvider
   {
        private Type contractType;
        private string container;
        private string configFile;
        private string name;
        private static object lockObj = new object();
        private static Dictionary< string, UnityConfigurationSection> sectionDict = new Dictionary< string, UnityConfigurationSection>();

        public ELUnityInstanceProvider(Type contractType, string container, string configFile, string name)
       {
            this.name = name;
            this.configFile = configFile;
            this.contractType = contractType;
            this.container = container;
       }

        #region IInstanceProvider 成員

        public object GetInstance(System.ServiceModel.InstanceContext instanceContext, System.ServiceModel.Channels.Message message)
       {
           Microsoft.Practices.Unity.Configuration.UnityConfigurationSection unitySection = GetUnityConfigurationSection();

            if (unitySection != null)
           {
                var container = new Microsoft.Practices.Unity.UnityContainer().LoadConfiguration(unitySection, string.IsNullOrEmpty( this.container) ? unitySection.Containers.Default.Name : this.container);
                var obj = string.IsNullOrEmpty( this.name) ? container.Resolve( this.contractType) : container.Resolve( this.contractType, this.name);

                var piabAtttr = obj.GetType().GetCustomAttributes( typeof(ELPolicyinjectionAttribute), false) as ELPolicyinjectionAttribute[];
                if (piabAtttr.Length > 0)
               {
                   obj = Microsoft.Practices.EnterpriseLibrary.PolicyInjection.PolicyInjection.Wrap( this.contractType, obj);
               }
                return obj;
           }
            return null;
       }
        private Microsoft.Practices.Unity.Configuration.UnityConfigurationSection GetUnityConfigurationSection()
       {
            if (! string.IsNullOrEmpty( this.configFile))
           {
                if (!sectionDict.ContainsKey( this.configFile))
               {
                    lock (lockObj)
                   {
                        if (!sectionDict.ContainsKey( this.configFile))
                       {
                           Microsoft.Practices.Unity.Configuration.UnityConfigurationSection unitySection = null;
                            var fileMap = new System.Configuration.ExeConfigurationFileMap { ExeConfigFilename = System.IO.Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, this.configFile) };
                           System.Configuration.Configuration configuration = System.Configuration.ConfigurationManager.OpenMappedExeConfiguration(fileMap, System.Configuration.ConfigurationUserLevel.None);
                           unitySection = configuration == null ? null : configuration.GetSection(Microsoft.Practices.Unity.Configuration.UnityConfigurationSection.SectionName) as Microsoft.Practices.Unity.Configuration.UnityConfigurationSection;
                            if (unitySection == null)
                                return null;
                           sectionDict.Add( this.configFile, unitySection);
                       }
                   }
               }
                return sectionDict[ this.configFile];
           }

            return System.Configuration.ConfigurationManager.GetSection(Microsoft.Practices.Unity.Configuration.UnityConfigurationSection.SectionName) as Microsoft.Practices.Unity.Configuration.UnityConfigurationSection;

       }

        public object GetInstance(System.ServiceModel.InstanceContext instanceContext)
       {
            return this.GetInstance(instanceContext, null);
       }

        public void ReleaseInstance(System.ServiceModel.InstanceContext instanceContext, object instance)
       {
           IDisposable disposable = instance as IDisposable;
            if (disposable != null)
           {
               disposable.Dispose();
           }
           instance = null;
       }

        #endregion
   }

下面我們需要已Attribute方式貼在Contract上：

View Code

public class ELUnityBehaviorAttribute : Attribute, IContractBehavior
   {
        public string Container
       {
            get;
            set;
       }

        public string ConfigFile
       {
            get;
            set;
       }

        public string Name
       {
            get;
            set;
       }

        #region IContractBehavior 成員

        public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
       {

       }

        public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
       {

       }

        public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.DispatchRuntime dispatchRuntime)
       {
           dispatchRuntime.InstanceProvider = new ELUnityInstanceProvider(contractDescription.ContractType, this.Container, this.ConfigFile, this.Name);
       }

        public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint)
       {
       }

        #endregion
   }

對於wcf同時我們也該支持配置文件擴展：

View Code

public class ELUnityBehaviorElement : BehaviorExtensionElement
   {
       [ConfigurationProperty( " Container ", IsRequired = false, DefaultValue = "")]
        public string Container
       {
            get;
            set;
       }

       [ConfigurationProperty( " ConfigFile ", IsRequired = false, DefaultValue = "")]
        public string ConfigFile
       {
            get;
            set;
       }

       [ConfigurationProperty( " Name ", IsRequired = false, DefaultValue = "")]
        public string Name
       {
            get;
            set;
       }

        protected override object CreateBehavior()
       {
            return new ELUnityBehavior( this.Container, this.ConfigFile, this.Name);
       }

        public override Type BehaviorType
       {
            get { return typeof(ELUnityBehavior); }
       }
   }

public class ELUnityBehavior : IEndpointBehavior
   {
        public string Container
       {
            get;
            set;
       }

        public string ConfigFile
       {
            get;
            set;
       }

        public string Name
       {
            get;
            set;
       }

        public ELUnityBehavior( string container, string configFile, string name)
       {
            this.Name = name;
            this.ConfigFile = configFile;
            this.Container = container;
       }
        #region IEndpointBehavior 成員

        public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
       {

       }

        public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
       {

       }

        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher)
       {
           endpointDispatcher.DispatchRuntime.InstanceProvider = new ELUnityInstanceProvider(endpoint.Contract.ContractType, this.Container, this.ConfigFile, this.Name);
       }

        public void Validate(ServiceEndpoint endpoint)
       {

       }

        #endregion
   }

目前我們已經簡單實現了：看看測試：

View Code

Contract：

   [ServiceContract()]
   [Green.WCFExtensions.ELUnityBehavior(Container = " test ", ConfigFile = " App1.config ")]
   public interface IHelloService
  {
      [OperationContract]
       string Say( string name);
  }

Service：

public class HelloService1 : IHelloService
   {
       [Microsoft.Practices.Unity.Dependency( " proxy ")]
        public IHelloService Service
       {
            get;
            set;
       }

        #region IHelloService 成員
           public string Say( string name)
       {
                      return Service.Say(name);

       }

        #endregion
   }

    public class HelloServiceProxy : IHelloService
   {
        #region IHelloService 成員
        public string Say( string name)
       {
            return string.Format( " Hello:{0} ", name);
       }

        #endregion
   }

配置app1.config:

< register type ="WcfService.IHelloService,WcfService" mapTo ="WcfService.HelloServiceProxy,WcfService" name ="proxy" > </ register >
< register type ="WcfService.IHelloService,WcfService" mapTo ="WcfService.HelloService1,WcfService" > </ register >

IOC,AOP博客參考：

AOP之PostSharp初見-OnExceptionAspect

AOP之PostSharp2-OnMethodBoundaryAspect

AOP之PostSharp3-MethodInterceptionAspect

AOP之PostSharp4-實現類INotifyPropertyChanged植入

AOP之PostSharp5-LocationInterceptionAspect

AOP之PostSharp6-EventInterceptionAspect

AOP之PostSharp7-解決IOC 不能直接new問題，簡化IOC開發和IOC對象LazyLoad

http://www.cnblogs.com/whitewolf/category/312638.html

利用Attribute簡化Unity框架IOC注入

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