In a normal command handler I can add new tab/part as this code:
#Execute
public void execute(Shell shell, EPartService partService, MApplication application,EModelService modelService) throws URISyntaxException{
MPart part = MBasicFactory.INSTANCE.createPart();
part.setLabel("New file ");
part.setCloseable(true);
part.setContributionURI("bundleclass://com.xxx.rcp.app.item_editor/com.xxx.rcp.app.item_editor.parts.ItemEditorPart");
List<MPartStack> stacks = modelService.findElements(application, "com.xxx.rcp.app.partstack.2", MPartStack.class, null);
stacks.get(0).getChildren().add(part);
partService.showPart(part, PartState.ACTIVATE);
}
Now I want to add new tab/part in one IEventBroker handleEvent.
First, I register the topic in the Activator:
#Override
public void start(BundleContext context) throws Exception {
IEclipseContext serviceContext = EclipseContextFactory.getServiceContext(context);
IEventBroker eventBroker = serviceContext.get(IEventBroker.class);
eventBroker.subscribe("MY_TOPIC", ContextInjectionFactory.make(OpenItemEditorHandler2.class, serviceContext));
}
Then, I add the tab/part in handleEvent:
public class OpenItemEditorHandler2 implements EventHandler {
// #Inject
// private IEclipseContext serviceContext;
// #Inject
// EPartService partService;
// #Inject
// MApplication application;
#Inject
IEclipseContext serviceContext;
// #Inject
// EModelService modelService;
// #Inject
// private ECommandService commandService;
//
// #Inject
// private EHandlerService handlerService;
#Override
public void handleEvent(Event event) {
MPart part = MBasicFactory.INSTANCE.createPart();
part.setLabel("New file ");
part.setCloseable(true);
part.setContributionURI("bundleclass://com.xxx.rcp.app.item_editor/com.xxx.rcp.app.item_editor.parts.ItemEditorPart");
// get the part stack and show created part
EModelService modelService = serviceContext.get(EModelService.class);
MApplication application = serviceContext.get(MApplication.class);
List<MPartStack> stacks = modelService.findElements(application, "com.xxx.rcp.app.partstack.2", MPartStack.class, null);
}
I cannot access or inject those services because of null all. Why? I have injected my object OpenItemEditorHandler2 in the Activator.
Or can you give some hints about other solutions to add new tab/part?
Thank you very much!
The context returned by EclipseContextFactory.getServiceContext only has OSGi services, it does not contain most of the normal e4 services so you can't use this to create your class. This means that the activator is not a suitable place to set up your subscribe.
You need to set up the subscribe somewhere where you have access to a proper eclipse context. An AddOn or the RCP LifeCycle might be suitable.
In an AddOn constructor you might have:
#Inject
public MyAddon(IEclipseContext context, IEventBroker eventBroker)
{
eventBroker.subscribe("MY_TOPIC", ContextInjectionFactory.make(OpenItemEditorHandler2.class, context));
}
Related
I will try to show my problem with a sample code easier to understand.
I have used WebApplicationFactory to develop my acceptance tests. Let's say that I have the typical minimal Program.cs with the following line to register one of my modules:
builder.Services.RegisterModule<StartupRegistrationModule>(builder.Configuration, builder.Environment);
And this module is declared like this:
internal sealed class StartupRegistrationModule : IServiceRegistrationModule
{
public static Dictionary<string, string> _dictionary = new();
public void Register(IServiceCollection services, IConfiguration configuration, IHostEnvironment hostEnvironment)
{
// Lot of modules being registered
_dictionary.Add("key", "value");
}
}
One of my tests file is like this:
public sealed class MyTests : AcceptanceTestBase
{
[Fact]
public void Test1()
{
// arrange
// act
// assert
}
[Fact]
public void Test2()
{
// arrange
// act
// assert
}
[Fact]
public void Test3()
{
// arrange
// act
// assert
}
}
And AcceptanceTestBase is:
public abstract class AcceptanceTestBase : IDisposable
{
protected HttpClient _httpClient;
protected WebApplicationFactory<Program> _webApplicationFactory;
public AcceptanceTestBase()
{
_webApplicationFactory = new WebApplicationFactory<Program>()
.WithWebHostBuilder(builder =>
{
// ... Configure test services
});
_httpClient = _webApplicationFactory.CreateClient();
}
public void Dispose()
{
_httpClient.Dispose();
_webApplicationFactory.Dispose();
}
}
If I try to execute all these tests my tests will fail in the second test run because the WebApplicationFactory is trying to build again the Application but it already has the key in the dictionary and it will fail. See the image for more understanding on the problem.
So my question is, how can I build the application in different scopes to do not share this dictionary state?
Thanks :)
Update:
The real static dictionary is saved behind this nuget package that keeps the track of all my circuit breaker policies state. I do not actually need even the HttpClients for my tests but did not find a way to remove them and not load this. I tried removing all the HttpClients to see if it also removes their dependencies, but it does not seem to make the trick.
It is because you are using:
internal sealed class StartupRegistrationModule : IServiceRegistrationModule
{
/// .. static here
public static Dictionary<string, string> _dictionary = new();
public void Register(IServiceCollection services, IConfiguration configuration, IHostEnvironment hostEnvironment)
{
// Lot of modules being registered
_dictionary.Add("key", "value");
}
}
The static Dictionary is shared over all your tests because they run in the same process.
Each test starts a new (Test-)WebHost but the dictionary remains untouched.
My proposal is to not use statics anywhere in DI context to prevent such hidden traps.
I don't know the purpose of your Dictionary here but maybe you can extract this to a singleton registration which you can replace in your (Test.)WebHost on each new test / startup?
I am implementing Xunit with Autofac, I could make it work by below code:
using (var scoped = DbFixture.Container.Resolve<UserReponsitory>())
{
var result = (scoped.GetAll()).ToList().Count();
Assert.Equal(2, result);
}
But I want to inject UserReponsitory to test method instead of using DbFixture.Container.Resolve. Is it possible to make below code work?
UnitTest1.cs
namespace XUnitTestPro
{
public class UnitTest1:IClassFixture<DbFixture>
{
private IUserReponsitory _userReponsitory;
public UnitTest1(IUserReponsitory userReponsitory)
{
_userReponsitory = userReponsitory;
}
[Fact]
public void Test1()
{
//using (var scoped = DbFixture.Container.Resolve<UserReponsitory>())
//{
// var result = (scoped.GetAll()).ToList().Count();
// Assert.Equal(2, result);
//}
var result = _userReponsitory.GetAll().ToList().Count();
Assert.Equal(2, result);
}
}
}
DbFixture.cs
namespace XUnitTestPro
{
public class DbFixture
{
public static IContainer Container { get; set; }
public DbFixture()
{
var builder = new ContainerBuilder();
var option = new DbContextOptionsBuilder<UserContext>().UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Database=EFProject;Trusted_Connection=True;MultipleActiveResultSets=true").Options;
UserContext context = new UserContext(option);
builder.RegisterInstance(context).As<UserContext>();
builder.RegisterType<UserReponsitory>().AsSelf().As<IUserReponsitory>();
builder.RegisterAssemblyTypes(typeof(DbFixture).GetTypeInfo().Assembly);
Container = builder.Build();
}
}
}
At present, I got below error, it seems to be related with IClassFixture<DbFixture> and public UnitTest1(IUserReponsitory userReponsitory) are different.
Message: The following constructor parameters did not have matching
fixture data: IUserReponsitory userReponsitory
Is there any way to achieve below code without call DbFixture.Container.Resolve which is similar to inject MVC Controller?
public UnitTest1(IUserReponsitory userReponsitory)
{
_userReponsitory = userReponsitory;
}
In other words, how could I dependence inject Unit Test class?
Any help would be appreciated.
Dependency Injection support in xUnit is kinda limited.
When you implement IClassFixture<DbFixture> interface, then xUnit expects one DbFixture parameter in it's constructor, and the type of the parameter depends on T in IClassFixture<T>.
That being said, when you implmenent IClassFixture<DbFixture> your constructor must look like public UnitTest1(DbFixture). But you have IUserRepository, so xUnit doesn't know what to inject in there.
You can also implement multiple IClassFixture<T> types, but you can use each T only once per test class.
From the official xUnit docs on shared context (IClassFixture<T>):
Important note: xUnit.net uses the presence of the interface IClassFixture<> to know that you want a class fixture to be created and cleaned up. It will do this whether you take the instance of the class as a constructor argument or not. Simiarly, if you add the constructor argument but forget to add the interface, xUnit.net will let you know that it does not know how to satisfy the constructor argument.
Update
It's still possible to use the IoC container resolve it, just not with constructor injection.
public class DbFixture
{
public IContainer Container { get; private set; }
public DbFixture()
{
var builder = new ContainerBuilder();
var option = new DbContextOptionsBuilder<UserContext>().UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Database=EFProject;Trusted_Connection=True;MultipleActiveResultSets=true").Options;
UserContext context = new UserContext(option);
builder.RegisterInstance(context).As<UserContext>();
builder.RegisterType<UserReponsitory>().AsSelf().As<IUserReponsitory>();
builder.RegisterAssemblyTypes(typeof(DbFixture).GetTypeInfo().Assembly);
Container = builder.Build();
}
}
public class UnitTest1:IClassFixture<DbFixture>
{
private IUserReponsitory _userReponsitory;
public UnitTest1(DbFixture fixture)
{
// resolve it here
_userReponsitory = fixture.Container.Resolve<IUserRepository>();
}
[Fact]
public void Test1()
{
//using (var scoped = DbFixture.Container.Resolve<UserReponsitory>())
//{
// var result = (scoped.GetAll()).ToList().Count();
// Assert.Equal(2, result);
//}
var result = _userReponsitory.GetAll().ToList().Count();
Assert.Equal(2, result);
}
}
However, the question is rather is that good way to use it? Not sure what you want to reach, but if you want do unit tests, then you don't have to use IoC container at all or concrete classes, just mocks and the type you are testing.
If you want do integration tests on ASP.NET Core MVC / WebApi, then you should rather use TestServer class which spins up the whole application with all IoC you have configured there already.
If you already have constructor injection enabled in your unit tests, you are nearly done. In the constructor of your test, inject a
Func<Owned<UserReponsitory>>
e.g.
namespace XUnitTestPro
{
public class UnitTest1:IClassFixture<DbFixture>
{
private Func<Owned<UserReponsitory>> _userRepositoryFactory;
public UnitTest1(Func<Owned<UserReponsitory>> userRepositoryFactory )
{
_userReponsitoryFactory = userReponsitoryFactory;
}
[Fact]
public void Test1()
{
//using (var scoped = DbFixture.Container.Resolve<UserReponsitory>())
//{
// var result = (scoped.GetAll()).ToList().Count();
// Assert.Equal(2, result);
//}
using (var scoped = userReponsitoryFactory())
{
var result = (scoped.Value.GetAll()).ToList().Count();
Assert.Equal(2, result);
}
}
}
}
The Func is a factory that allows you to return a Owned. Owned is a container that allows you to dispose your object on your own (the using block)
I followed this article and got everything working except dependency inject (partially). In my project I am using unity and I am trying to create a custom Transaction attribute the purpose of which is to start a NHibernate transaction before the execution of an action and commit/rollback the transaction after the method execution.
This is the definition of my attribute:-
public class TransactionAttribute : Attribute
{
}
Following is the definition of my TransactionFilter
public class TransactionFilter : IActionFilter
{
private readonly IUnitOfWork _unitOfWork;
public TransactionFilter(IUnitOfWork uow) {
_unitOfWork = uow;
}
public Task<HttpResponseMessage> ExecuteActionFilterAsync(HttpActionContext actionContext, CancellationToken cancellationToken, Func<Task<HttpResponseMessage>> continuation) {
var transAttribute = actionContext.ActionDescriptor.GetCustomAttributes<TransactionAttribute>().SingleOrDefault();
if (transAttribute == null) {
return continuation();
}
var transaction = uow.BeginTransaction();
return continuation().ContinueWith(t =>
{
try{
transaction.Commit();
return t.Result;
}
catch(Exception e)
{
transaction.Rollback();
return new ExceptionResult(ex, actionContext.ControllerContext.Controller as ApiController).ExecuteAsync(cancellationToken).Result;
}
}
}
}
And I have created a custom filter provider which uses unity to construct this filter.
public class UnityActionFilterProvider
: ActionDescriptorFilterProvider,
IFilterProvider
{
private readonly IUnityContainer container;
public UnityActionFilterProvider(IUnityContainer container)
{
this.container = container;
}
public new IEnumerable<FilterInfo> GetFilters(HttpConfiguration configuration, HttpActionDescriptor actionDescriptor)
{
foreach (IActionFilter actionFilter in container.ResolveAll<IActionFilter>())
{
// TODO: Determine correct FilterScope
yield return new FilterInfo(actionFilter, FilterScope.Global);
}
}
}
I register the UnityActionFilterProvider in UnityWebApiActivator (I am using Unity.AspNet.WebApi package) as follows
public static void Start()
{
var container = UnityConfig.GetConfiguredContainer();
var resolver = new UnityDependencyResolver(container);
var config = GlobalConfiguration.Configuration;
config.DependencyResolver = resolver;
var providers = config.Services.GetFilterProviders();
var defaultProvider = providers.Single(i => i is ActionDescriptorFilterProvider);
config.Services.Remove(typeof(IFilterProvider), defaultProvider);
config.Services.Add(typeof(IFilterProvider), new UnityActionFilterProvider(container));
}
The problem is everything works ok for the first request for any action but subsequent requests for the same action doesn't recreate the TransactionFilter which means it doesn't call the constructor to assign a new UOW. I don't think I can disable the action filter caching.
The only option I have got now is to use the service locator pattern and get UOW instance using container inside ExecuteActionFilterAsync which in my opinion kills the purpose of this and I am better off implementing custom ActionFilterAttribute.
Any suggestions ?
As far as I've been able to tell during the years, what happens in web application startup code essentially has Singleton lifetime. That code only runs once.
This means that there's only a single instance of each of your filters. This is good for performance, but doesn't fit your scenario.
The easiest solution to that problem, although a bit of a leaky abstraction, is to inject an Abstract Factory instead of the dependency itself:
public class TransactionFilter : IActionFilter
{
private readonly IFactory<IUnitOfWork> _unitOfWorkFactory;
public TransactionFilter(IFactory<IUnitOfWork> uowFactory) {
_unitOfWorkFactory = uowFactory;
}
// etc...
Then use the factory in the ExecuteActionFilterAsync method:
var transaction = _unitOfWorkFactory.Create().BeginTransaction();
A more elegant solution, in my opinion, would be to use a Decoraptor that Adapts the TransactionFilter, but the above answer is probably easier to understand.
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.
I've recently upgraded to the new version of the excellent SignalR library, and moved all my Dependency Injection from StructureMap to Ninject, as Ninject seemed to be better supported.
I've got the dependency injection working fine for Server-side notifications using the "Broadcasting over a Hub from outside of a Hub" described here: https://github.com/SignalR/SignalR/wiki/Hubs.
The problem I'm getting is that all SignalR messages originating from the Javascript hub don't seem to be triggering the dependency injection.
I'm also using MVC4 WebAPI which also takes some shoe-horning to get dependency injection working.
Here's my Hub:
public class PresenceHub : Hub, IPresenceHub
{
private readonly IUserRepository _userRepository;
private readonly IFormsAuthenticationProvider _formsAuthenticationProvider;
public PresenceHub(IFormsAuthenticationProvider formsAuthenticationProvider, IUserRepository userRepository)
{
_userRepository = userRepository;
_formsAuthenticationProvider = formsAuthenticationProvider;
}
public void PresenceChange(string presence)
{
var user = _userRepository.FindById(_formsAuthenticationProvider.GetUserId());
var rosterEntry = Mapper.Map<User, RosterEntryDto>(user);
rosterEntry.Presence = presence;
Clients.updatePresence(rosterEntry);
}
}
Here's my Ninject Bootstrapper:
Namespace SLx.Web.App_Start
{
using System;
using System.Web;
using Microsoft.Web.Infrastructure.DynamicModuleHelper;
using Ninject;
using Ninject.Web.Common;
public static class NinjectWebCommon
{
private static readonly Bootstrapper bootstrapper = new Bootstrapper();
public static void Start()
{
DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
bootstrapper.Initialize(CreateKernel);
}
public static void Stop()
{
bootstrapper.ShutDown();
}
private static IKernel CreateKernel()
{
var kernel = new StandardKernel();
kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
// SignalR Ninject Resolver
GlobalHost.DependencyResolver = new SignalR.Ninject.NinjectDependencyResolver(kernel);
// WebApi Ninject Resolver
GlobalConfiguration.Configuration.DependencyResolver = new NinjectDependencyResolver(kernel);
RegisterServices(kernel);
return kernel;
}
private static void RegisterServices(IKernel kernel)
{
}
}
I'm notifying clients on the serverside via a PresenceProxy defined as follows:
public class PresenceHubProxy : IPresenceHubProxy
{
private readonly IHubContext _hubContext;
public PresenceHubProxy()
{
_hubContext = GlobalHost.ConnectionManager.GetHubContext<PresenceHub>();
}
public void NotifyLogin(RosterEntryDto user)
{
_hubContext.Clients.updatePresence(user);
}
public void NotifyLogout(RosterEntryDto user)
{
_hubContext.Clients.updatePresence(user);
}
}
The Proxy works fine, injected into Controllers or their dependencies, and can send messages to the clients.
When the clients try to call SignalR via Javascript I get the following error:
No parameterless constructor defined for this object.
It looks like Ninject is not being invoked because the dependencies are not being injected into the constructor. What do I need to do to get Dependency Injection working for Javascript calls too?
Update --
Following advice from DFowler, I've replaced the Resolver in PostApplicationStart. Debugging I can see in the Immediate Window that SignalR.GlobalHost.Resolver is of type NinjectDependencyResolver but its still not working I get the same error - no paramaterless constructor.
I've then removed the NinjectDependencyResolver NuGet Library and added the source file to my solution and am using that for debugging purposes. Debugging on GetService and GetServices shows that neither method is ever called in NinjectDependencyResolver.
Any Ideas?
Problem was I hadn't called RouteTable.Routes.MapHubs:
GlobalHost.DependencyResolver = new SignalRNinjectResolver(NinjectWebCommon.Kernel);
RouteTable.Routes.MapHubs(new SignalRNinjectResolver(NinjectWebCommon.Kernel));
From the docs https://github.com/SignalR/SignalR/wiki/Extensibility:
NOTE: DO NOT override the global resolver in PreApplicationStart, it will not work, or it'll work only sometimes. Do it in PostApplicationStart (using WebActivator) or in Global.asax.