如何在WCF中使用动态代理-创新互联
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成都创新互联公司是专业的灵石网站建设公司,灵石接单;提供网站设计制作、网站建设,网页设计,网站设计,建网站,PHP网站建设等专业做网站服务;采用PHP框架,可快速的进行灵石网站开发网页制作和功能扩展;专业做搜索引擎喜爱的网站,专业的做网站团队,希望更多企业前来合作!一、重构前的项目代码
重构前的项目代码共7层代码,其中WCF服务端3层,WCF接口层1层,客户端3层,共7层
1.服务端WCF服务层SunCreate.InfoPlatform.Server.Service
2.服务端数据库访问接口层SunCreate.InfoPlatform.Server.Bussiness
3.服务端数据库访问实现层SunCreate.InfoPlatform.Server.Bussiness.Impl
4.WCF接口层SunCreate.InfoPlatform.Contract
5.客户端代理层SunCreate.InfoPlatform.Client.Proxy
6.客户端业务接口层SunCreate.InfoPlatform.Client.Bussiness
7.客户端业务实现层SunCreate.InfoPlatform.Client.Bussiness.Impl
二、客户端通过动态代理重构
1.实现在拦截器中添加Ticket、处理异常、Close对象
2.客户端不需要再写代理层代码,而使用动态代理层
3.对于简单的增删改查业务功能,也不需要再写业务接口层和业务实现层,直接调用动态代理;对于复杂的业务功能以及缓存,才需要写业务接口层和业务实现层
客户端动态代理工厂类ProxyFactory代码(该代码目前写在客户端业务实现层):
using Castle.DynamicProxy; using System; using System.Collections.Concurrent; using System.Collections.Generic; using System.Linq; using System.ServiceModel; using System.Text; using System.Threading.Tasks; namespace SunCreate.InfoPlatform.Client.Bussiness.Imp { ////// WCF服务工厂 /// PF是ProxyFactory的简写 /// public class PF { ////// 拦截器缓存 /// private static ConcurrentDictionary_interceptors = new ConcurrentDictionary (); /// /// 代理对象缓存 /// private static ConcurrentDictionary_objs = new ConcurrentDictionary (); private static ProxyGenerator _proxyGenerator = new ProxyGenerator(); /// /// 获取WCF服务 /// ///WCF接口 public static T Get() { Type interfaceType = typeof(T); IInterceptor interceptor = _interceptors.GetOrAdd(interfaceType, type => { string serviceName = interfaceType.Name.Substring(1); //服务名称 ChannelFactory channelFactory = new ChannelFactory (serviceName); return new ProxyInterceptor (channelFactory); }); return (T)_objs.GetOrAdd(interfaceType, type => _proxyGenerator.CreateInterfaceProxyWithoutTarget(interfaceType, interceptor)); //根据接口类型动态创建代理对象,接口没有实现类 } } }
客户端拦截器类ProxyInterceptor
using Castle.DynamicProxy; using log4net; using SunCreate.Common.Base; using SunCreate.InfoPlatform.Client.Bussiness; using System; using System.Collections.Generic; using System.Linq; using System.Reflection; using System.ServiceModel; using System.ServiceModel.Channels; using System.Text; using System.Threading.Tasks; namespace SunCreate.InfoPlatform.Client.Bussiness.Imp { ////// 拦截器 /// ///接口 public class ProxyInterceptor: IInterceptor { private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor )); private ChannelFactory _channelFactory; public ProxyInterceptor(ChannelFactory channelFactory) { _channelFactory = channelFactory; } /// /// 拦截方法 /// public void Intercept(IInvocation invocation) { //准备参数 ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters(); object[] valArr = new object[parameterInfoArr.Length]; for (int i = 0; i < parameterInfoArr.Length; i++) { valArr[i] = invocation.GetArgumentValue(i); } //执行方法 T server = _channelFactory.CreateChannel(); using (OperationContextScope scope = new OperationContextScope(server as IContextChannel)) { try { HI.Get().AddTicket(); invocation.ReturnValue = invocation.Method.Invoke(server, valArr); var value = HI.Get ().GetValue(); ((IChannel)server).Close(); } catch (Exception ex) { _log.Error("ProxyInterceptor " + typeof(T).Name + " " + invocation.Method.Name + " 异常", ex); ((IChannel)server).Abort(); } } //out和ref参数处理 for (int i = 0; i < parameterInfoArr.Length; i++) { ParameterInfo paramInfo = parameterInfoArr[i]; if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef) { invocation.SetArgumentValue(i, valArr[i]); } } } } }
如何使用:
Listlist = PF.Get ().GetEscortTaskList();
这里不用再写try catch,异常在拦截器中处理
三、WCF服务端通过动态代理,在拦截器中校验Ticket、处理异常
服务端动态代理工厂类ProxyFactory代码(代码中保存动态代理dll不是必需的):
using Autofac; using Castle.DynamicProxy; using Castle.DynamicProxy.Generators; using SunCreate.Common.Base; using System; using System.Collections.Concurrent; using System.Collections.Generic; using System.IO; using System.Linq; using System.Reflection; using System.ServiceModel; using System.ServiceModel.Activation; using System.Text; using System.Threading.Tasks; namespace SunCreate.InfoPlatform.WinService { ////// 动态代理工厂 /// public class ProxyFactory { ////// 拦截器缓存 /// private static ConcurrentDictionary_interceptors = new ConcurrentDictionary (); /// /// 代理对象缓存 /// private static ConcurrentDictionary_objs = new ConcurrentDictionary (); private static ProxyGenerator _proxyGenerator; private static ModuleScope _scope; private static ProxyGenerationOptions _options; static ProxyFactory() { AttributesToAvoidReplicating.Add(typeof(ServiceContractAttribute)); //动态代理类不继承接口的ServiceContractAttribute String path = AppDomain.CurrentDomain.BaseDirectory; _scope = new ModuleScope(true, false, ModuleScope.DEFAULT_ASSEMBLY_NAME, Path.Combine(path, ModuleScope.DEFAULT_FILE_NAME), "MyDynamicProxy.Proxies", Path.Combine(path, "MyDymamicProxy.Proxies.dll")); var builder = new DefaultProxyBuilder(_scope); _options = new ProxyGenerationOptions(); //给动态代理类添加AspNetCompatibilityRequirementsAttribute属性 PropertyInfo proInfoAspNet = typeof(AspNetCompatibilityRequirementsAttribute).GetProperty("RequirementsMode"); CustomAttributeInfo customAttributeInfo = new CustomAttributeInfo(typeof(AspNetCompatibilityRequirementsAttribute).GetConstructor(new Type[0]), new object[0], new PropertyInfo[] { proInfoAspNet }, new object[] { AspNetCompatibilityRequirementsMode.Allowed }); _options.AdditionalAttributes.Add(customAttributeInfo); //给动态代理类添加ServiceBehaviorAttribute属性 PropertyInfo proInfoInstanceContextMode = typeof(ServiceBehaviorAttribute).GetProperty("InstanceContextMode"); PropertyInfo proInfoConcurrencyMode = typeof(ServiceBehaviorAttribute).GetProperty("ConcurrencyMode"); customAttributeInfo = new CustomAttributeInfo(typeof(ServiceBehaviorAttribute).GetConstructor(new Type[0]), new object[0], new PropertyInfo[] { proInfoInstanceContextMode, proInfoConcurrencyMode }, new object[] { InstanceContextMode.Single, ConcurrencyMode.Multiple }); _options.AdditionalAttributes.Add(customAttributeInfo); _proxyGenerator = new ProxyGenerator(builder); } /// /// 动态创建代理 /// public static object CreateProxy(Type contractInterfaceType, Type impInterfaceType) { IInterceptor interceptor = _interceptors.GetOrAdd(impInterfaceType, type => { object _impl = HI.Provider.GetService(impInterfaceType); return new ProxyInterceptor(_impl); }); return _objs.GetOrAdd(contractInterfaceType, type => _proxyGenerator.CreateInterfaceProxyWithoutTarget(contractInterfaceType, _options, interceptor)); //根据接口类型动态创建代理对象,接口没有实现类 } ////// 保存动态代理dll /// public static void Save() { string filePath = Path.Combine(_scope.WeakNamedModuleDirectory, _scope.WeakNamedModuleName); if (File.Exists(filePath)) { File.Delete(filePath); } _scope.SaveAssembly(false); } } }
说明:object _impl = HI.Provider.GetService(impInterfaceType); 这句代码用于创建数据库访问层对象,HI是项目中的一个工具类,类似Autofac框架的功能
服务端拦截器类ProxyInterceptor
using Castle.DynamicProxy; using log4net; using SunCreate.Common.Base; using SunCreate.InfoPlatform.Server.Bussiness; using System; using System.Collections.Generic; using System.Linq; using System.Reflection; using System.ServiceModel; using System.ServiceModel.Channels; using System.Text; using System.Threading.Tasks; namespace SunCreate.InfoPlatform.WinService { ////// 拦截器 /// public class ProxyInterceptor : IInterceptor { private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor)); private object _impl; public ProxyInterceptor(object impl) { _impl = impl; } ////// 拦截方法 /// public void Intercept(IInvocation invocation) { //准备参数 ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters(); object[] valArr = new object[parameterInfoArr.Length]; for (int i = 0; i < parameterInfoArr.Length; i++) { valArr[i] = invocation.GetArgumentValue(i); } //执行方法 try { if (HI.Get().CheckTicket()) { Type implType = _impl.GetType(); MethodInfo methodInfo = implType.GetMethod(invocation.Method.Name); invocation.ReturnValue = methodInfo.Invoke(_impl, valArr); } } catch (Exception ex) { _log.Error("ProxyInterceptor " + invocation.TargetType.Name + " " + invocation.Method.Name + " 异常", ex); } //out和ref参数处理 for (int i = 0; i < parameterInfoArr.Length; i++) { ParameterInfo paramInfo = parameterInfoArr[i]; if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef) { invocation.SetArgumentValue(i, valArr[i]); } } } } }
服务端WCF的ServiceHost工厂类:
using Spring.ServiceModel.Activation; using System; using System.Collections.Generic; using System.Linq; using System.Reflection; using System.ServiceModel; using System.Text; using System.Threading.Tasks; namespace SunCreate.InfoPlatform.WinService { public class MyServiceHostFactory : ServiceHostFactory { public MyServiceHostFactory() { } public override ServiceHostBase CreateServiceHost(string reference, Uri[] baseAddresses) { Assembly contractAssembly = Assembly.GetAssembly(typeof(SunCreate.InfoPlatform.Contract.IBaseDataService)); Assembly impAssembly = Assembly.GetAssembly(typeof(SunCreate.InfoPlatform.Server.Bussiness.IBaseDataImp)); Type contractInterfaceType = contractAssembly.GetType("SunCreate.InfoPlatform.Contract.I" + reference); Type impInterfaceType = impAssembly.GetType("SunCreate.InfoPlatform.Server.Bussiness.I" + reference.Replace("Service", "Imp")); if (contractInterfaceType != null && impInterfaceType != null) { var proxy = ProxyFactory.CreateProxy(contractInterfaceType, impInterfaceType); ServiceHostBase host = new ServiceHost(proxy, baseAddresses); return host; } else { return null; } } } }
svc文件配置ServiceHost工厂类:
<%@ ServiceHost Language="C#" Debug="true" Service="BaseDataService" Factory="SunCreate.InfoPlatform.WinService.MyServiceHostFactory" %>
如何使用自定义的ServiceHost工厂类启动WCF服务,下面是部分代码:
MyServiceHostFactory factory = new MyServiceHostFactory(); ListhostList = new List (); foreach (var oFile in dirInfo.GetFiles()) { try { string strSerName = oFile.Name.Replace(oFile.Extension, ""); string strUrl = string.Format(m_strBaseUrl, m_serverPort, oFile.Name); var host = factory.CreateServiceHost(strSerName, new Uri[] { new Uri(strUrl) }); if (host != null) { hostList.Add(host); } } catch (Exception ex) { Console.WriteLine("出现异常:" + ex.Message); m_log.ErrorFormat(ex.Message + ex.StackTrace); } } ProxyFactory.Save(); foreach (var host in hostList) { try { foreach (var endpoint in host.Description.Endpoints) { endpoint.EndpointBehaviors.Add(new MyEndPointBehavior()); //用于添加消息拦截器、全局异常拦截器 } host.Open(); m_lsHost.TryAdd(host); } catch (Exception ex) { Console.WriteLine("出现异常:" + ex.Message); m_log.ErrorFormat(ex.Message + ex.StackTrace); } }
WCF服务端再也不用写Service层了
四、当我需要添加一个WCF接口,以实现一个查询功能,比如查询所有组织机构,重构前,我需要在7层添加代码,然后客户端调用,重构后,我只需要在3层添加代码,然后客户端调用
1.在WCF接口层添加接口
2.在服务端数据访问接口层添加接口
3.在服务端数据访问实现层添加实现方法
4.客户端调用:var orgList = PF.Get
重构前,需要在7层添加代码,虽然每层代码都差不多,可以复制粘贴,但是复制粘贴也很麻烦啊,重构后省事多了,从此再也不怕写增删改查了
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