I want to use a serviceKey to distinguish between different implementations of a service.
Code explanation: there is an ICat interface, which is used to "say" a cat's word "Meow". The word "Meow" comes from the implementation of ISoundProducer (it is injected into an implementation of ICat).
I register two services (ICat and ISoundProducer) with the same serviceKey = "x". After that I try to resolve an ICat instance, but it fails.
Here is the demo code:
using DryIoc;
using System;
class Program
{
static void Main(string[] args)
{
Container ioc = new Container();
ioc.Register<ISoundProducer, GoodCatSoundProducer>(serviceKey: "x");
ioc.Register<ICat, GoodCat>(serviceKey: "x");
var c1 = ioc.Resolve<ICat>("x");
c1.Say();
Console.ReadKey();
}
}
public interface ISoundProducer
{
string ProduceSound();
}
public class GoodCatSoundProducer : ISoundProducer
{
string ISoundProducer.ProduceSound() => "Meow";
}
public interface ICat
{
void Say();
}
public class GoodCat : ICat
{
private ISoundProducer _soundProducer;
public GoodCat(ISoundProducer soundProducer) => this._soundProducer = soundProducer;
void ICat.Say() => Console.WriteLine(_soundProducer.ProduceSound());
}
This gives me an exception:
Unable to resolve ISoundProducer as parameter "soundProducer" in
GoodCat: ICat {ServiceKey="x"} from container with normal and
dynamic registrations: x, {ID=28, ImplType=GoodCatSoundProducer}}
What am I doing wrong? How can I resolve a service with another injected service, while they both have the same serviceKey?
Specify the key of dependency:
ioc.Register<ICat, GoodCat>(serviceKey: "x",
made: Made.Of(Parameters.Of.Type<ISoundProducer>(serviceKey: "x")));
ioc.Register<ISoundProducer, GoodCatSoundProducer>(serviceKey: "x");
Related
I am trying to use Ninject to inject an EventLogger instance into a custom ExceptionFilterAttribute. Whenever I run the code, the EventLogger instance is null. I have implemented an IFilterProvider to resolve dependencies in a similar manner for my custom AuthorizationFilterAttribute, and that works fine. Any ideas?
Not Working
public class ErrorHandlingAttribute : ExceptionFilterAttribute
{
[Inject]
public IEventLogger EventLogger { get; set; }
public override void OnException(HttpActionExecutedContext actionExecutedContext)
{
EventLogger.LogException(actionExecutedContext.Exception);
actionExecutedContext.Response = actionExecutedContext.Request.
CreateResponse(HttpStatusCode.BadRequest,
new ServiceErrorResponseDTO("An unhandled exception occurred while calling " +
actionExecutedContext.Request.RequestUri.ToString() +
". This event has been logged. If you continue to receive this error contact Weichert"));
}
}
Working
public class RequireAuthorizationAttribute : AuthorizationFilterAttribute
{
[Inject]
public IServiceRepository ServiceRepository { get; set; }
public override void OnAuthorization(HttpActionContext actionContext)
{
#region Header Authentication
var authHeader = actionContext.Request.Headers.Authorization;
if (authHeader != null)
{
Custom IFilterProvider
public class NinjectWebApiFilterProvider : IFilterProvider
{
private IKernel _kernel;
public NinjectWebApiFilterProvider(IKernel kernel)
{
_kernel = kernel;
}
public IEnumerable<FilterInfo> GetFilters(HttpConfiguration configuration, HttpActionDescriptor actionDescriptor)
{
var controllerFilters = actionDescriptor.ControllerDescriptor.GetFilters().Select(instance => new FilterInfo(instance, FilterScope.Controller));
var actionFilters = actionDescriptor.GetFilters().Select(instance => new FilterInfo(instance, FilterScope.Action));
var filters = controllerFilters.Concat(actionFilters);
foreach(var filter in filters)
{
_kernel.Inject(filter.Instance);
}
return filters;
}
}
NinjectWebCommon CreateKernel Method
private static IKernel CreateKernel()
{
var kernel = new StandardKernel();
kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
// Ad Ninject support for Web API.
GlobalConfiguration.Configuration.DependencyResolver = new NinjectDependencyResolver(kernel);
GlobalConfiguration.Configuration.Services.Add(typeof(IFilterProvider),
new NinjectWebApiFilterProvider(kernel));
RegisterServices(kernel);
return kernel;
}
NinjectWebCommon Bindings
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<ServiceDbContext>().To<ServiceDbContext>();
kernel.Bind<IServiceRepository>().To<ServiceRepository>();
kernel.Bind<CareerDevelopmentDbContext>().To<CareerDevelopmentDbContext>();
kernel.Bind<ICareerDevelopmentRepository>().To<CareerDevelopmentRepository>();
kernel.Bind<ICareerDevelopmentService>().To<CareerDevelopmentService>();
kernel.Bind<IEventLogger>().To<ServiceEventLogger>();
kernel.Bind<IFilterProvider>().To<NinjectWebApiFilterProvider>().WithConstructorArgument("kernel", kernel);
}
I had the same problem and was configuring my error handler the same way by adding it to the filter collection in WebApiConfig.cs which meant it wasn't getting handled by the FilterProvider implementation I had added. So I did this instead:
public class LoggingExceptionFilterAttribute : ExceptionFilterAttribute, IExceptionFilter
{
// this is what I wanted injected
private IEmailService emailService;
public LoggingExceptionFilterAttribute(IEmailService service)
{
emailService = service;
}
public override void OnException(HttpActionExecutedContext actionExecutedContext)
{
// my implementation here
}
}
Then I registered this in NinjectWebCommon like so:
kernel.Bind<System.Web.Http.Filters.IExceptionFilter>().To<LoggingExceptionFilterAttribute>().InSingletonScope();
And then in WebApiConfig I realized that I could get a hold of the DependencyResolver so I did this:
config.Filters.Add((IFilter)config.DependencyResolver.GetService(typeof(IExceptionFilter)));
Now Ninject handles constructing my exception filter and I can even do constructor injection instead of needing [Inject] attributes and I don't have to add my ExceptionFilterAttribute to every API controller.
Ok, you have to make sure you are binding your custom IFilterProvider as well. As of writing the Ninject.Web.WebApi Nuget package is unstable and would do that automatically for you, if you were using it. Just in the same fashion Ninject.MVC3 does this for your regular controllers.
Just make sure you have this binding, and the replaced DependencyResolver will look for IFilterProvider implementation via your Ninject kernel as well:
kernel.Bind<IFilterProvider>().To<NinjectWebApiFilterProvider>();
Then your NinjectWebApiFilterProvider will kick in and inject dependencies into your filters as per your code.
Hi I am trying to change a code example found here
http://imar.spaanjaars.com/577/aspnet-n-layered-applications-implementing-a-repository-using-ef-code-first-part-5
In his example he uses structure map, when I converted it to windsor I can get it to work with the one repository using the following.
container.Register(Component.For<IUnitOfWorkFactory>().ImplementedBy<EFUnitOfWorkFactory>(),
Component.For<IUnitOfWork>().ImplementedBy<EFUnitOfWork>(),
Component.For<Model.Repositories.IPeopleRepository>().ImplementedBy<PeopleRepository>().LifestyleTransient());
But what I really want to do is to map all the irepository based interfacees to thier implementation.
Here is the IRepository, T is the entity, K is the prmiary key type
public interface IRepository<T, K> where T : class
{
}
Its implementation Is
public abstract class Repository<T> : IRepository<T, int>, IDisposable where T : DomainEntity<int>
{
}
My controller has the interface IPeopleRepository as a constructor paramerter.
public interface IPeopleRepository : IRepository<Person, int>
{
}
public class PeopleRepository : Repository<Person>, IPeopleRepository
{
}
I want to have one register to register all repositories, something like this, but it wont match and i get the error Service 'Spaanjaars.ContactManager45.Model.Repositories.IPeopleRepository' which was not registered
container.Register(Component.For(typeof(IRepository<,>))
.ImplementedBy(typeof(Repository<>))
.LifestylePerWebRequest());
What am i missing in regards to this? is it because my irepository has 2 generic types?
In order to map all the IRepository based interfaces to their implementations .WithService.AllInterfaces() should be used.
This registration should solve your issue.
container.Register(
Classes.FromThisAssembly()
.BasedOn(typeof(IRepository<,>))
.WithService.AllInterfaces()
.LifestylePerWebRequest());
There are some tests to test it. I claim they are green.
[TestClass]
public class InstallerTest
{
private IWindsorContainer container;
[TestInitialize]
public void Init()
{
container = new WindsorContainer().Install(new Installer());
}
[TestMethod]
public void ResilveTest_ResolvesViaIRepository()
{
// act
var repository = container.Resolve<IRepository<Person, int>>();
// assert
repository.Should().BeOfType<PeopleRepository>();
}
[TestMethod]
public void ResilveTest_ResolvesViaIPeopleRepository()
{
// act
var repository = container.Resolve<IPeopleRepository>();
// assert
repository.Should().BeOfType<PeopleRepository>();
}
}
public class Installer : IWindsorInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register(
Classes.FromThisAssembly()
.BasedOn(typeof(IRepository<,>))
.WithService.AllInterfaces()
.LifestylePerThread());
}
}
In my Ninject binding module,
public class CarModule : NinjectModule
{
public override void Load()
{
Kernel.Bind(scanner => scanner.FromThisAssembly().SelectAllClasses()
.InheritedFrom<ICar>().BindAllInterfaces());
foreach (var binding in kernel.GetBindings(typeof(ICar)))
{
Trace.WriteLine(string.Format("[{0}] Service bound to [{1}]",
binding.Service.Name,
binding.Target.GetType().Name));
}
// Output looks like:
//[ICar] Service bound to [BindingTarget]
//[ICar] Service bound to [BindingTarget]
//[ICar] Service bound to [BindingTarget]
}
}
I need a sanity check to see types I've successfully bound to my services. I'm having trouble accessing the type names of the bound types. Instead of [BindingTarget], I'd like to see [Mercedes], [Ferrari], etc...
Is there a good and/or common way to do this?
In your IocKernel, I d just add a method to GetAll the Instances of a given Type T, and call it back after Loading your Module:
public static class IocKernel
{
private static StandardKernel _kernel;
public static IEnumerable<T> GetAll<T>()
{
return _kernel.GetAll<T>();
}
public static void Initialize(params INinjectModule[] modules)
{
if (_kernel == null)
{
_kernel = new StandardKernel(modules);
List<ICar> bindingsList= _kernel.GetAll<ICar>().ToList();
foreach(ICar binding in bindingsList)
{
Trace.WriteLine(string.Format("Service bound to [{1}]", binding.GetType().Name)
}
}
}
}
Below's code is working fine, and successfully create an instance for class DummyComponnent.
But the problem arises when i had changed the factory method name CreatDummyComponnent()
to GetDummyComponnent() or anything else except Creat as the beginning of method name, say AnyThingComponent throws an exception. is there any specify naming rule for factory methods ?
using System;
using Castle.Facilities.TypedFactory;
using Castle.MicroKernel.Registration;
using Castle.Windsor;
namespace AsFactoryImplementation
{
public interface IDummyComponnentFactory
{
IDummyComponnent CreatDummyComponnent();
// void Relese(IDummyComponnent factory);
}
public interface IDummyComponnent
{
void Show();
}
public class DummyComponnent:IDummyComponnent
{
public DummyComponnent()
{
Console.WriteLine("we are working here");
}
public void Show()
{
Console.WriteLine("just testing this for better performance");
}
}
class Program
{
static void Main(string[] args)
{
var container = new WindsorContainer();
container.AddFacility<TypedFactoryFacility>();
container.Register(Component.For<IDummyComponnent>().ImplementedBy<DummyComponnent>().Named("FirstConnection"),
Component.For<IDummyComponnentFactory>().AsFactory());
var val = container.Resolve<IDummyComponnentFactory>();
var iDummy = val.CreatDummyComponnent();
iDummy.Show();
Console.WriteLine("OK its done ");
Console.ReadLine();
}
}
}
You should be able to use anything for starting the method names on the Factory, except for starting with Get.
If you start with Get it will try to resolve the component by name instead of by interface.
So what would work in your example is:
var iDummy = val.GetFirstConnection();
Good luck,
Marwijn.
Im writing a test for an automapper map. One of the destination members in the map requires a value resolver, and that value resolver has service dependencies which are injected. I want to use the real implementation for the resolver (since thats part of the map im testing) but Id like to use mocks for the dependencies the resolver has.
Ofcourse I want to try to avoid using an ioc container for in my tests, but how do I easily resolve my value resolver's dependencies without one?
This is my rather simplified example, in the real case there are several resolvers with sometimes many dependencies, and I really dont like to basically implement my own dependency resolver in my tests. Should I use a lightweight ioc container?
[TestFixture]
public class MapperTest
{
private IMyService myService;
[SetUp]
public void Setup()
{
Mapper.Initialize(config =>
{
config.ConstructServicesUsing(Resolve);
config.AddProfile<MyProfile>();
});
}
public T Resolve<T>()
{
return (T) Resolve(typeof (T));
}
public object Resolve(Type type)
{
if (type == typeof(MyValueResolver))
return new MyValueResolver(Resolve<IMyService>());
if (type == typeof(IMyService))
return myService;
Assert.Fail("Can not resolve type " + type.AssemblyQualifiedName);
return null;
}
[Test]
public void ShouldConfigureCorrectly()
{
Mapper.AssertConfigurationIsValid();
}
[Test]
public void ShouldMapStuff()
{
var source = new Source() {...};
var child = new Child();
myService = MockRepository.GenerateMock<IMyService>();
myService .Stub(x => x.DoServiceStuff(source)).Return(child);
var result = Mapper.Map<ISource, Destination>(source);
result.Should().Not.Be.Null();
result.Child.Should().Be.SameInstanceAs(child);
}
}
public class MyProfile : Profile
{
protected override void Configure()
{
base.Configure();
CreateMap<ISource, Destination>()
.ForMember(m => m.Child, c => c.ResolveUsing<MyResolver>());
}
}
public class MyResolver: ValueResolver<ISource, Destination>
{
private readonly IMyService _myService;
public MyResolver(IMyService myService)
{
_myService = myService;
}
protected override Child ResolveCore(ISource source)
{
return _myService.DoServiceStuff(source);
}
}
}
Here's one solution, but basically its what iv done already:
http://groups.google.com/group/automapper-users/browse_thread/thread/aea8bbe32b1f590a/f3185d30322d8109
The suggestion is to use a service locator which are set up differently depending on test or real implementation.