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WCF 使用动态代理精简代码架构 (WCF动态调用)

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):

using Castle.DynamicProxy;
 System;
 System.Collections.Concurrent;
 System.Collections.Generic;
 System.Linq;
 System.ServiceModel;
 System.Text;
 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>();

         代理对象缓存
        object> _objs = object>();

        static proxygenerator _proxygenerator = new proxygenerator();

         获取WCF服务
        </summary>
        <typeparam name="T">WCF接口</typeparam>
        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
        }
    }
}
View Code

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):

 log4net;
 SunCreate.Common.Base;
 SunCreate.InfoPlatform.Client.Bussiness;
 System.Reflection;
 System.ServiceModel.Channels;
 拦截</summary>
    接口</typeparam>
    class ProxyInterceptor<T> : IInterceptor
    {
        static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor<T>));

        private ChannelFactory<T> _channelFactory;

        public ProxyInterceptor(ChannelFactory<T> channelFactory)
        {
            _channelFactory = channelFactory;
        }

         拦截方法
        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
            )
            {
                ParameterInfo paramInfo = parameterInfoArr[i];
                if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef)
                {
                    invocation.SetArgumentValue(i,valArr[i]);
                }
            }
        }
    }
}
View Code

如何使用:

List<EscortTask> list = PF.Get<IBussDataService>().GetEscortTaskList();
View Code

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):

 Autofac;
 Castle.DynamicProxy.Generators;
 System.IO;
 System.ServiceModel.Activation;
 SunCreate.InfoPlatform.WinService
{
     动态代理工厂
     ProxyFactory
    {
        static proxygenerator _proxygenerator;

         ModuleScope _scope;

         proxygenerationoptions _options;

         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,1)">falsecope.DEFAULT_ASSEMBLY_NAME,Path.Combine(path,ModuleScope.DEFAULT_FILE_NAME),MyDynamicProxy.ProxiesMyDymamicProxy.Proxies.dll));
            var builder =  DefaultProxyBuilder(_scope);

            _options =  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]),1)">object[0],1)">new PropertyInfo[] { proInfoAspNet },1)">[] { 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 = ConcurrencyMode);
            customAttributeInfo = typeof(ServiceBehaviorAttribute).GetConstructor(new PropertyInfo[] { proInfoInstanceContextMode,proInfoConcurrencyMode },1)">[] { InstanceContextMode.Single,ConcurrencyMode.Multiple });
            _options.AdditionalAttributes.Add(customAttributeInfo);

            _proxygenerator =  proxygenerator(builder);
        }

         动态创建代理
        static  CreateProxy(Type contractInterfaceType,Type impInterfaceType)
        {
            IInterceptor interceptor = _interceptors.GetorAdd(impInterfaceType,1)">object _impl = HI.Provider.GetService(impInterfaceType);
                 ProxyInterceptor(_impl);
            });

            return _objs.GetorAdd(contractInterfaceType,type => _proxygenerator.CreateInterfaceProxyWithoutTarget(contractInterfaceType,_options,1)">        }

         保存动态代理dll
         Save()
        {
            string filePath = Path.Combine(_scope.WeakNamedModuleDirectory,_scope.WeakNamedModuleName);
            if (File.Exists(filePath))
            {
                File.Delete(filePath);
            }
            _scope.SaveAssembly();
        }
    }
}
View Code

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

 SunCreate.InfoPlatform.Server.Bussiness;
 ProxyInterceptor : IInterceptor
    {
        (ProxyInterceptor));

         _impl;

        public ProxyInterceptor( impl)
        {
            _impl = impl;
        }

        执行方法
            if (HI.Get<ISecurityImp>().CheckTicket())
                {
                    Type impltype = _impl.GetType();
                    MethodInfo methodInfo = impltype.getmethod(invocation.Method.Name);
                    invocation.ReturnValue = methodInfo.Invoke(_impl,valArr);
                }
            }
             (Exception ex)
            {
                _log.Error(" + invocation.targettype.Name + 
View Code

服务端WCF的ServiceHost工厂类:

 Spring.ServiceModel.Activation;
 SunCreate.InfoPlatform.WinService
{
     MyServiceHostFactory : ServiceHostFactory
    {
        public MyServiceHostFactory() { }

        override ServiceHostBase CreateServiceHost(string reference,Uri[] baseAddresses)
        {
            Assembly contractAssembly = Assembly.GetAssembly((SunCreate.InfoPlatform.Contract.IBaseDataService));
            Assembly impAssembly = Assembly.GetAssembly((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",Impif (contractInterfaceType != null && impInterfaceType != null)
            {
                var proxy = ProxyFactory.CreateProxy(contractInterfaceType,impInterfaceType);
                ServiceHostBase host =  ServiceHost(proxy,baseAddresses);
                return host;
            }
            else;
            }
        }
    }
}
View Code

svc文件配置ServiceHost工厂类:

<%@ ServiceHost Language="C# Debugtrue  ServiceBaseDataService  FactorySunCreate.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 =  MyServiceHostFactory();
List<ServiceHostBase> hostList = new List<ServiceHostBase>();
foreach (var oFile in dirInfo.GetFiles())
{
    
    {
        string strSerName = oFile.Name.Replace(oFile.Extension,1)">"");
        string strUrl = .Format(m_strBaseUrl,m_serverPort,oFile.Name);
        var host = factory.CreateServiceHost(strSerName,1)">new Uri[] {  Uri(strUrl) });
        if (host != )
        {
            hostList.Add(host);
        }
    }
     (Exception ex)
    {
        Console.WriteLine(出现异常: ex.Message);
        m_log.ErrorFormat(ex.Message + ex.StackTrace);
    }
}
ProxyFactory.Save();
var host  hostList)
{
    var endpoint  host.Description.Endpoints)
        {
            endpoint.EndpointBehaviors.Add(new MyEndPointBehavior()); 用于添加消息拦截器、全局异常拦截
        }
        host.open();
        m_lsHost.TryAdd(host);
    }
     ex.StackTrace);
    }
}
View Code

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

 

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