实现分布式的Membership和上下文传递剖析Word格式文档下载.docx

1、我们将该自定义MembershipProvider称为RemoteMembershipProvider。图2揭示了RemoteMembershipProvider实现的原理：RemoteMembershipProvider通过调用WCF服务MembershipService提供对成员资格所有功能的实现；MembershipService则通过调用Membership实现服务；最终的实现还是落在了SqlMembershipProvider这个原生的MembershipProvider上。clip_image004图2 RemoteMembershipProvider实现原理1、服务契约和服务实现

2、首先来看看MembershipService实现的服务契约的定义。由于MembershipService最终是为RemoteMembershipProvider这个自定义MembershipProvider服务的，所以服务操作的定义是基于MembershipProvider的API定义。MembershipProvider包含两种类型的成员：属性和方法，简单起见，我们可以为MembershipProvider每一个抽象方法定义一个匹配的服务操作；而对于所有属性，完全采用服务端（应用服务器）的MembershipProvider相关属性。在RemoteMembershipProvider初始化的

3、时候通过调用MembershipService获取所有服务端MembershipProvider的配置信息。为此，我们为MembershipProvider的所有属性定义了一个数据契约：MembershipConfigData。在PetShop中，MembershipConfigData和服务契约一起定义在Infrastructures.Service.Interface项目中。 1: using System.Runtime.Serialization; 2: using System.Web.Security; 3: namespace Artech.PetShop.Infrastruct

4、ures.Service.Interface 4: 5: DataContract（Namespace = 6: public class MembershipConfigData 7: 8: DataMember 9: public string ApplicationName 10: get; set; 11: 12: 13: public bool EnablePasswordReset 14: 15: 16: 17: public bool EnablePasswordRetrieval 18: 19: 20: 21: public int MaxInvalidPasswordAtte

5、mpts 22: 23: 24: 25: public int MinRequiredNonAlphanumericCharacters 26: 27: 28: 29: public int MinRequiredPasswordLength 30: 31: 32: 33: public int PasswordAttemptWindow 34: 35: 36: 37: public MembershipPasswordFormat PasswordFormat 38: 39: 40: 41: public string PasswordStrengthRegularExpression 42

6、: 43: 44: 45: public bool RequiresQuestionAndAnswer 46: 47: 48: 49: public bool RequiresUniqueEmail 50: 51: 52:在服务契约中，定义了一个额外的方法GetMembershipConfigData获取服务端MembershipProvider的所有配置信息，而对于服务操作的定义，则与MembershipProvider同名抽象方法相对应。 using System.ServiceModel; ServiceContract（Namespace= public interface IMemb

7、ershipService OperationContract bool ChangePassword（string username, string oldPassword, string newPassword）; bool ChangePasswordQuestionAndAnswer（string username, string password, string newPasswordQuestion, string newPasswordAnswer）; MembershipUser CreateUser（string username, string password, stri

8、ng email, string passwordQuestion, string passwordAnswer, bool isApproved, object providerUserKey, out MembershipCreateStatus status）; bool DeleteUser（string username, bool deleteAllRelatedData）; MembershipUserCollection FindUsersByEmail（string emailToMatch, int pageIndex, int pageSize, out int tota

9、lRecords）; MembershipUserCollection FindUsersByName（string usernameToMatch, int pageIndex, int pageSize, out int totalRecords）; MembershipUserCollection GetAllUsers（int pageIndex, int pageSize, out int totalRecords）; int GetNumberOfUsersOnline（）; string GetPassword（string username, string answer）; O

10、perationContract（Name=GetUserByName） MembershipUser GetUser（string username, bool userIsOnline）;GetUserByID MembershipUser GetUser（object providerUserKey, bool userIsOnline）; string GetUserNameByEmail（string email）; string ResetPassword（string username, string answer）; bool UnlockUser（string userNam

11、e）; void UpdateUser（MembershipUser user）; bool ValidateUser（string username, string password）; MembershipConfigData GetMembershipConfigData（）;服务的实现，则异常简单，我们须要做的仅仅是通过Membership.Provider获得当前的MembershipProvider，调用同名的属性或方法即可。MembershipService定义在Infrastructures.Service中，定义如下： using Artech.PetShop.Infrast

12、ructures.Service.Interface; namespace Artech.PetShop.Infrastructures.Service public class MembershipService : IMembershipService #region IMembershipService Members public bool ChangePassword（string username, string oldPassword, string newPassword） return Membership.Provider.ChangePassword（username,

13、oldPassword, newPassword）; public bool ChangePasswordQuestionAndAnswer（string username, string password, string newPasswordQuestion, string newPasswordAnswer） return Membership.Provider.ChangePasswordQuestionAndAnswer（username, password, newPasswordQuestion, newPasswordAnswer）; /其他成员 public Membersh

14、ipConfigData GetMembershipConfigData（） return new MembershipConfigData ApplicationName = Membership.Provider.ApplicationName, EnablePasswordReset = Membership.Provider.EnablePasswordReset, EnablePasswordRetrieval = Membership.Provider.EnablePasswordRetrieval, MaxInvalidPasswordAttempts = Membership.

15、Provider.MaxInvalidPasswordAttempts, MinRequiredNonAlphanumericCharacters = Membership.Provider.MinRequiredNonAlphanumericCharacters, MinRequiredPasswordLength = Membership.Provider.MinRequiredPasswordLength, PasswordAttemptWindow = Membership.Provider.PasswordAttemptWindow, PasswordFormat = Members

16、hip.Provider.PasswordFormat, PasswordStrengthRegularExpression = Membership.Provider.PasswordStrengthRegularExpression, RequiresQuestionAndAnswer = Membership.Provider.RequiresQuestionAndAnswer, RequiresUniqueEmail = Membership.Provider.RequiresUniqueEmail ; #endregion2、RemoteMembershipProvider的实现由于

17、RemoteMembershipProvider完全通过调用WCF服务的方式提供对所有成员资格功能的实现，所以进行RemoteMembershipProvider配置时，配置相应的终结点就可以了。 configurationsystem.webmembership defaultProvider=RemoteProviderprovidersadd name= type=Artech.PetShop.Infrastructures.RemoteMembershipProvider,Artech.PetShop.Infrastructures, Version=1.0.0.0, Culture=

18、neutral, PublicKeyToken=null endpoint=membershipservice/providers/membership/system.websystem.serviceModelclientendpoint address=http:/localhost/PetShop/Infrastructures/MembershipService.svc behaviorConfiguration=petShopBehavior binding=ws2007HttpBinding contract=Artech.PetShop.Infrastructures.Servi

19、ce.Interface.IMembershipService name=/client/system.serviceModel/configuration在RemoteMembershipProvider中，通过Initialize方法获取配置的终结点名称并创建服务代理。通过该代理调用GetMembershipConfigData操作获取服务端MembershipProvider的配置信息，并对RemoteMembershipProvider进行初始化，RemoteMembershipProvider定义如下： using System.Collections.Specialized; us

20、ing System.Configuration; using System.Linq; using Artech.PetShop.Common; namespace Artech.PetShop.Infrastructures public class RemoteMembershipProvider : MembershipProvider private bool _enablePasswordReset; private bool _enablePasswordRetrieval; /其他字段成员 public IMembershipService MembershipProxy pr

21、ivate set; public override int MaxInvalidPasswordAttempts get return this._maxInvalidPasswordAttempts; /其他属性成员 public override void Initialize（string name, NameValueCollection config） if （!config.AllKeys.Contains（endpoint） throw new ConfigurationErrorsException（Missing the mandatory endpoint configu

22、raiton property.）; this.MembershipProxy = ServiceProxyFactory.Create（config）; base.Initialize（name, config）; MembershipConfigData configData = this.MembershipProxy.GetMembershipConfigData（）; this.ApplicationName = configData.ApplicationName; this._enablePasswordReset = configData.EnablePasswordReset; this._enablePasswordRetrieval = configData.EnablePasswordRetrieval; /.对于其他抽象方法的实现，仅仅须要通过上面创建的服务代理，调用相应的服务操作即可。注： 为了避免在服务操作调用后频繁地进行服务代理的关闭（Close）和终止（Abort）操作，我们采用基于AOP的方式实现服务的调用，将这些操作封装到一个自定义的RealProxy中，并通过ServiceProxyFactory创建该