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src/Autofac.Integration.Mef/LazyWithMetadataRegistrationSource.cs
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|---|---|---|
| @@ -1,102 +1,117 @@ | ||
| // This software is part of the Autofac IoC container | ||
| // Copyright (c) 2007 - 2008 Autofac Contributors | ||
| // http://autofac.org | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person | ||
| // obtaining a copy of this software and associated documentation | ||
| // files (the "Software"), to deal in the Software without | ||
| // restriction, including without limitation the rights to use, | ||
| // copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the | ||
| // Software is furnished to do so, subject to the following | ||
| // conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be | ||
| // included in all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | ||
| // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
| // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | ||
| // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
| // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
| // OTHER DEALINGS IN THE SOFTWARE. | ||
|
|
||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.ComponentModel.Composition; | ||
| using System.Linq; | ||
| using System.Reflection; | ||
| using Autofac.Builder; | ||
| using Autofac.Core; | ||
| using Autofac.Integration.Mef.Util; | ||
|
|
||
| namespace Autofac.Integration.Mef | ||
| { | ||
| /// <summary> | ||
| /// Support the <see cref="System.Lazy{T, TMetadata}"/> | ||
| /// types automatically whenever type T is registered with the container. | ||
| /// Metadata values come from the component registration's metadata. | ||
| /// When a dependency of a lazy type is used, the instantiation of the underlying | ||
| /// component will be delayed until the Value property is first accessed. | ||
| /// </summary> | ||
| class LazyWithMetadataRegistrationSource : IRegistrationSource | ||
| { | ||
| static readonly MethodInfo CreateLazyRegistrationMethod = typeof(LazyWithMetadataRegistrationSource).GetMethod( | ||
| "CreateLazyRegistration", BindingFlags.Static | BindingFlags.NonPublic); | ||
|
|
||
| delegate IComponentRegistration RegistrationCreator(Service service, IComponentRegistration valueRegistration); | ||
|
|
||
| public IEnumerable<IComponentRegistration> RegistrationsFor(Service service, Func<Service, IEnumerable<IComponentRegistration>> registrationAccessor) | ||
| { | ||
| if (registrationAccessor == null) | ||
| { | ||
| throw new ArgumentNullException("registrationAccessor"); | ||
| } | ||
| var swt = service as IServiceWithType; | ||
| if (swt == null || !swt.ServiceType.IsGenericTypeDefinedBy(typeof(Lazy<,>))) | ||
| return Enumerable.Empty<IComponentRegistration>(); | ||
|
|
||
| var valueType = swt.ServiceType.GetGenericArguments()[0]; | ||
| var metaType = swt.ServiceType.GetGenericArguments()[1]; | ||
|
|
||
| var valueService = swt.ChangeType(valueType); | ||
|
|
||
| var registrationCreator = (RegistrationCreator)Delegate.CreateDelegate( | ||
| typeof(RegistrationCreator), | ||
| CreateLazyRegistrationMethod.MakeGenericMethod(valueType, metaType)); | ||
|
|
||
| return registrationAccessor(valueService) | ||
| .Select(v => registrationCreator(service, v)); | ||
| } | ||
|
|
||
| public bool IsAdapterForIndividualComponents | ||
| { | ||
| get { return true; } | ||
| } | ||
|
|
||
| public override string ToString() | ||
| { | ||
| return LazyWithMetadataRegistrationSourceResources.LazyWithMetadataRegistrationSourceDescription; | ||
| } | ||
|
|
||
| // ReSharper disable UnusedMember.Local | ||
| static IComponentRegistration CreateLazyRegistration<T, TMeta>(Service providedService, IComponentRegistration valueRegistration) | ||
| // ReSharper restore UnusedMember.Local | ||
| { | ||
| var rb = RegistrationBuilder.ForDelegate( | ||
| (c, p) => | ||
| { | ||
| var context = c.Resolve<IComponentContext>(); | ||
| return new Lazy<T, TMeta>( | ||
| () => (T)context.ResolveComponent(valueRegistration, p), | ||
| AttributedModelServices.GetMetadataView<TMeta>(valueRegistration.Target.Metadata)); | ||
| }) | ||
| .As(providedService) | ||
| .Targeting(valueRegistration); | ||
|
|
||
| return rb.CreateRegistration(); | ||
| } | ||
| } | ||
| } | ||
| // This software is part of the Autofac IoC container | ||
| // Copyright (c) 2007 - 2008 Autofac Contributors | ||
| // http://autofac.org | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person | ||
| // obtaining a copy of this software and associated documentation | ||
| // files (the "Software"), to deal in the Software without | ||
| // restriction, including without limitation the rights to use, | ||
| // copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the | ||
| // Software is furnished to do so, subject to the following | ||
| // conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be | ||
| // included in all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | ||
| // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
| // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | ||
| // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
| // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
| // OTHER DEALINGS IN THE SOFTWARE. | ||
|
|
||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.ComponentModel.Composition; | ||
| using System.Linq; | ||
| using System.Reflection; | ||
| using Autofac.Builder; | ||
| using Autofac.Core; | ||
| using Autofac.Integration.Mef.Util; | ||
|
|
||
| namespace Autofac.Integration.Mef | ||
| { | ||
| /// <summary> | ||
| /// Support the <see cref="System.Lazy{T, TMetadata}"/> | ||
| /// types automatically whenever type T is registered with the container. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Metadata values come from the component registration's metadata. | ||
| /// When a dependency of a lazy type is used, the instantiation of the underlying | ||
| /// component will be delayed until the <see cref="Lazy{T}.Value"/> property | ||
| /// is first accessed. | ||
| /// </remarks> | ||
| internal class LazyWithMetadataRegistrationSource : IRegistrationSource | ||
| { | ||
| private static readonly MethodInfo CreateLazyRegistrationMethod = typeof(LazyWithMetadataRegistrationSource).GetMethod("CreateLazyRegistration", BindingFlags.Static | BindingFlags.NonPublic); | ||
|
|
||
| private delegate IComponentRegistration RegistrationCreator(Service service, IComponentRegistration valueRegistration); | ||
|
|
||
| public IEnumerable<IComponentRegistration> RegistrationsFor(Service service, Func<Service, IEnumerable<IComponentRegistration>> registrationAccessor) | ||
| { | ||
| if (registrationAccessor == null) | ||
| { | ||
| throw new ArgumentNullException("registrationAccessor"); | ||
| } | ||
|
|
||
| var swt = service as IServiceWithType; | ||
| if (swt == null || !swt.ServiceType.IsGenericTypeDefinedBy(typeof(Lazy<,>))) | ||
| { | ||
| return Enumerable.Empty<IComponentRegistration>(); | ||
| } | ||
|
|
||
| var valueType = swt.ServiceType.GetGenericArguments()[0]; | ||
| var metaType = swt.ServiceType.GetGenericArguments()[1]; | ||
| var valueService = swt.ChangeType(valueType); | ||
| var registrationCreator = (RegistrationCreator)Delegate.CreateDelegate( | ||
| typeof(RegistrationCreator), | ||
| CreateLazyRegistrationMethod.MakeGenericMethod(valueType, metaType)); | ||
|
|
||
| return registrationAccessor(valueService) | ||
| .Select(v => registrationCreator(service, v)); | ||
| } | ||
|
|
||
| public bool IsAdapterForIndividualComponents | ||
| { | ||
| get | ||
| { | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| public override string ToString() | ||
| { | ||
| return LazyWithMetadataRegistrationSourceResources.LazyWithMetadataRegistrationSourceDescription; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Lazy registration creator called via reflection by the source | ||
| /// to generate a <see cref="Lazy{T, TMetadata}"/> component. | ||
| /// </summary> | ||
| /// <typeparam name="T">The type of service being resolved.</typeparam> | ||
| /// <typeparam name="TMetadata">The type of metadata object associated with the service.</typeparam> | ||
| /// <param name="providedService">The service for which the component registration is being generated.</param> | ||
| /// <param name="valueRegistration">The registration that should provide the component value.</param> | ||
| /// <returns> | ||
| /// An <see cref="IComponentRegistration"/> containing a <see cref="Lazy{T, TMetadata}"/>. | ||
| /// </returns> | ||
| private static IComponentRegistration CreateLazyRegistration<T, TMetadata>(Service providedService, IComponentRegistration valueRegistration) | ||
| { | ||
| var rb = RegistrationBuilder.ForDelegate( | ||
| (c, p) => | ||
| { | ||
| var context = c.Resolve<IComponentContext>(); | ||
| return new Lazy<T, TMetadata>( | ||
| () => (T)context.ResolveComponent(valueRegistration, p), | ||
| AttributedModelServices.GetMetadataView<TMetadata>(valueRegistration.Target.Metadata)); | ||
| }) | ||
| .As(providedService) | ||
| .Targeting(valueRegistration); | ||
|
|
||
| return rb.CreateRegistration(); | ||
| } | ||
| } | ||
| } |
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