【问题标题】:Castle Windsor Typed Factory Facility with generics带有仿制药的温莎城堡类型工厂设施
【发布时间】:2011-08-22 20:58:19
【问题描述】:

我正在尝试注册一个可以解析如下定义的事件处理程序数组的工厂:

    public interface IEvent { }

    public class EventA : IEvent { }
    public class EventB : IEvent { }
    public class EventC : IEvent { }


    public interface IHandler<TEvent> where TEvent : IEvent
    {
        void Handle(TEvent ev);
    }


    public class HandlerX : IHandler<EventA>, IHandler<EventB>
    {
        public void Handle(EventA ev)
        {
            throw new NotImplementedException("handle EventA");
        }

        public void Handle(EventB ev)
        {
            throw new NotImplementedException("handle EventB");
        }
    }

    public class HandlerY : IHandler<EventB>, IHandler<EventC>
    {
        public void Handle(EventB ev)
        {
            throw new NotImplementedException("handle EventB");
        }

        public void Handle(EventC ev)
        {
            throw new NotImplementedException("handle EventC");
        }
    }

    public interface HandlerFactory
    {
        object[] GetHandlersForEvent(IEvent ev);
    }

基本上对于每个事件,我可以有更多的处理程序,每个处理程序可以处理多个事件。我还希望工厂返回 object[] 因为在运行时我不知道会返回什么封闭的泛型类型。

我尝试了 Krzysztof Koźmic http://kozmic.pl/2010/03/11/advanced-castle-windsor-ndash-generic-typed-factories-auto-release-and-more/ 描述的方法 但仍然有问题。 基本上我的问题归结为从 DefaultTypedFactoryComponentSelector 派生的自定义类型返回什么类型。

我尝试了以下多种变体:

public class HandlerSelector : DefaultTypedFactoryComponentSelector
    {
        protected override TypedFactoryComponent BuildFactoryComponent(MethodInfo method, string componentName, Type componentType, System.Collections.IDictionary additionalArguments)
        {
            Type eventType = null;
            foreach (var k in additionalArguments.Values)
            {
                eventType = k.GetType();
            }

            var handlerType = typeof(IHandler<>).MakeGenericType(eventType);
            var handlerArrayType = handlerType.MakeArrayType();
            //return handlerArrayType;
            return new TypedFactoryComponentCollection(handlerType, additionalArguments);
        }

        protected override Type GetComponentType(MethodInfo method, object[] arguments)
        {
            return typeof (object);
            /*
            var message = arguments[0];
            var handlerType = typeof(IHandler<>).MakeGenericType(message.GetType());
            var handlerArrayType = handlerType.MakeArrayType();
            return handlerArrayType;
             */
        }

        /*
        public TypedFactoryComponent SelectComponent(MethodInfo method, Type type, object[] arguments)
        {
            var message = arguments[0];
            var handlerType = typeof(IHandler<>).MakeGenericType(message.GetType());
            var result = new TypedFactoryComponentCollection(handlerType.MakeArrayType(), new Arguments(arguments));
            return result;
        }*/
    }

Windsor 安装程序定义为:

public class Installer : IWindsorInstaller
    {
        public void Install(IWindsorContainer container, IConfigurationStore store)
        {
            container.AddFacility<TypedFactoryFacility>()
                .Register(
                    Component.For<HandlerSelector>().ImplementedBy<HandlerSelector>(),
                    Component.For<AutoReleaseHandlerInterceptor>(),
                    AllTypes.FromAssemblyContaining<Program>()
                        .BasedOn(typeof(IHandler<>))
                        .WithService.Base()
                        .Configure(c => c.LifeStyle.Is(LifestyleType.Transient)
                                            .Interceptors<AutoReleaseHandlerInterceptor>()),
                    Component.For<HandlerFactory>().AsFactory(c => c.SelectedWith<HandlerSelector>()));
        }
    }

调用 factory.GetHandlersForEvent(ev) 时;我收到一个抱怨数组类型不匹配的异常: “试图以与数组不兼容的类型访问元素。”

堆栈跟踪:

在 System.Collections.Generic.Dictionary2.ValueCollection.CopyTo(TValue[] array, Int32 index)
at System.Collections.Generic.Dictionary
2.ValueCollection.System.Collections.ICollection.CopyTo(数组数组,Int32 索引)
在 e:\OSS.Code\Castle.Windsor\src\Castle.Windsor\MicroKernel\DefaultKernel_Resolve.cs:line 285 中的 Castle.MicroKernel.DefaultKernel.ResolveAll(类型服务,IDictionary 参数)
在 e:\OSS.Code\Castle.Windsor\src\Castle.Windsor\Facilities\TypedFactory\TypedFactoryComponentCollection.cs:line 39 中的 Castle.Facilities.TypedFactory.TypedFactoryComponentCollection.Resolve(IKernel kernel)
在 e:\OSS.Code\Castle.Windsor\src\Castle.Windsor\Facilities\TypedFactory\Internal\TypedFactoryInterceptor.cs:line 173 中的 Castle.Facilities.TypedFactory.Internal.TypedFactoryInterceptor.Resolve(IInvocation 调用)
在 e:\OSS.Code\Castle.Windsor\src\Castle.Windsor\Facilities\TypedFactory\Internal\TypedFactoryInterceptor.cs:line 83 中的 Castle.Facilities.TypedFactory.Internal.TypedFactoryInterceptor.Intercept(IInvocation 调用)
在 Castle.DynamicProxy.AbstractInvocation.Proceed()
在 Castle.Proxies.HandlerFactoryProxy.GetHandlersForEvent(IEvent ev)
在 c:\users\user\documents\visual studio 2010\Projects 中的 CastleWindsorTests.Program.TryIt(HandlerFactory factory)

如何实现 HandlerSelector 以便它与定义为返回 object[] 的工厂一起工作,而运行时的真实对象是封闭的泛型类型? 我会很高兴看到一些现有的文档,其中包含 ITypedFactoryComponentSelector / DefaultTypedFactoryComponentSelector 实现者的指南。是的,我尝试了http://docs.castleproject.org/(S(kwaa14uzdj55gv55dzgf0vui))/Windsor.Typed-Factory-Facility-interface-based-factories.ashx,但这里没有太多关于上述类型的内容。

我真的不想引入服务定位器(而不是工厂);)。

【问题讨论】:

    标签: dependency-injection castle-windsor


    【解决方案1】:

    回答我自己的问题:

    我一定是瞎了。在仔细阅读了我覆盖的方法的 xmldoc 之后,将 HandlerSelector 更改为以下解决了问题:

    public class HandlerSelector : DefaultTypedFactoryComponentSelector
    {
        protected override TypedFactoryComponent BuildFactoryComponent(MethodInfo method, string componentName, Type componentType, System.Collections.IDictionary additionalArguments)
        {                
            return new TypedFactoryComponentCollection(componentType, additionalArguments);
        }
    
        protected override Type GetComponentType(MethodInfo method, object[] arguments)
        {
            var message = arguments[0];
            var handlerType = typeof(IHandler<>).MakeGenericType(message.GetType());
            return handlerType;
        }
    }
    

    【讨论】:

    • 您更新到 v3 了吗?如果是这样,您也可以使用该代码编辑帖子。尝试做一些非常相似的事情并且很难转换
    【解决方案2】:

    @workabyte

    对于 Castle v3,GetComponentType 方法保持不变,但 BuildFactoryComponent 方法对我来说如下所示:

    protected override Func<IKernelInternal, IReleasePolicy, object> BuildFactoryComponent(MethodInfo method, string componentName, Type componentType, IDictionary additionalArguments)
    {
        return (kernel, rp) => kernel.ResolveAll(componentType);
    }
    

    【讨论】:

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