使用Castle.Core.dll实现,核心代码是使用Castle.DynamicProxy.ProxyGenerator类的CreateInterfaceProxyWithoutTarget方法动态创建代理对象
NuGet上面Castle.Core的下载量1.78亿之多
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):
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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 { /// <summary> /// WCF服务工厂 /// PF是ProxyFactory的简写 /// </summary> public class PF { /// <summary> /// 拦截器缓存 /// </summary> private static ConcurrentDictionary<Type, IInterceptor> _interceptors = new ConcurrentDictionary<Type, IInterceptor>(); /// <summary> /// 代理对象缓存 /// </summary> private static ConcurrentDictionary<Type, object > _objs = new ConcurrentDictionary<Type, object >(); private static ProxyGenerator _proxyGenerator = new ProxyGenerator(); /// <summary> /// 获取WCF服务 /// </summary> /// <typeparam name="T">WCF接口</typeparam> public static T Get<T>() { Type interfaceType = typeof (T); IInterceptor interceptor = _interceptors.GetOrAdd(interfaceType, type => { string serviceName = interfaceType.Name.Substring(1); //服务名称 ChannelFactory<T> channelFactory = new ChannelFactory<T>(serviceName); return new ProxyInterceptor<T>(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<T>代码(该代码目前写在客户端业务实现层):
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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 { /// <summary> /// 拦截器 /// </summary> /// <typeparam name="T">接口</typeparam> public class ProxyInterceptor<T> : IInterceptor { private static ILog _log = LogManager.GetLogger( typeof (ProxyInterceptor<T>)); private ChannelFactory<T> _channelFactory; public ProxyInterceptor(ChannelFactory<T> channelFactory) { _channelFactory = channelFactory; } /// <summary> /// 拦截方法 /// </summary> 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<ISecurityBussiness>().AddTicket(); invocation.ReturnValue = invocation.Method.Invoke(server, valArr); var value = HI.Get<ISecurityBussiness>().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:
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List<EscortTask> list = PF.Get<IBussDataService>().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):
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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 { /// <summary> /// 动态代理工厂 /// </summary> public class ProxyFactory { /// <summary> /// 拦截器缓存 /// </summary> private static ConcurrentDictionary<Type, IInterceptor> _interceptors = new ConcurrentDictionary<Type, IInterceptor>(); /// <summary> /// 代理对象缓存 /// </summary> private static ConcurrentDictionary<Type, object > _objs = new ConcurrentDictionary<Type, object >(); 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); } /// <summary> /// 动态创建代理 /// </summary> 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 } /// <summary> /// 保存动态代理dll /// </summary> 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<T>代码:
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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 { /// <summary> /// 拦截器 /// </summary> public class ProxyInterceptor : IInterceptor { private static ILog _log = LogManager.GetLogger( typeof (ProxyInterceptor)); private object _impl; public ProxyInterceptor( object impl) { _impl = impl; } /// <summary> /// 拦截方法 /// </summary> 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<ISecurityImp>().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:
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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:
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<%@ 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:
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MyServiceHostFactory factory = new MyServiceHostFactory(); List<ServiceHostBase> hostList = new List<ServiceHostBase>(); 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<IBaseDataService>().GetOrgList();
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
五、性能损失
主要是invocation.Method.Invoke比直接调用慢,耗时是直接调用的2、3倍,但是多花费的时间跟数据库查询耗时比起来,是微不足道的
以上就是WCF如何使用动态代理精简代码架构的详细内容,更多关于WCF使用动态代理精简代码架构的资料请关注服务器之家其它相关文章!
原文链接:https://www.cnblogs.com/firebet/p/14513991.html