I work with the Akka.net. I want to use the DryIoc as an IoC-container, but there is no ready-made using adapters for the actor system in the Akka. The documentation says that to use a custom IoC-container, I need to implement IDependencyResolver. Looked for the libraries for AutoFac and CastleWindsor as examples, I made a DependencyResolver for DryIoc:
using System;
using System.Collections.Concurrent;
using System.Linq;
using System.Runtime.CompilerServices;
using Akka.Actor;
using Akka.DI.Core;
using DryIoc;
namespace Akka.DI.DryIoc
{
public sealed class DryIocDependencyResolver : IDependencyResolver, INoSerializationVerificationNeeded
{
private readonly IContainer container;
private readonly ConcurrentDictionary<string, Type> typeCache;
private readonly ActorSystem system;
private readonly ConditionalWeakTable<ActorBase, IResolverContext> references;
public DryIocDependencyResolver(IContainer container, ActorSystem system)
{
this.container = container
?? throw new ArgumentNullException("container");
this.system = system
?? throw new ArgumentNullException("system");
this.typeCache = new ConcurrentDictionary<string, Type>(StringComparer.OrdinalIgnoreCase);
this.references = new ConditionalWeakTable<ActorBase, IResolverContext>();
this.system.AddDependencyResolver(this);
}
public Func<ActorBase> CreateActorFactory(Type actorType)
=> () =>
{
var context = this.container.OpenScope();
var key = (ActorBase)context.Resolve(actorType);
this.references.Add(key, context);
return key;
};
public Type GetType(string actorName)
{
var type = actorName.GetTypeValue();
if (type is null)
type = this.container.GetServiceRegistrations()
.Where(registration =>
registration.ImplementationType.Name.Equals(actorName, StringComparison.OrdinalIgnoreCase))
.Select(registration =>
registration.ImplementationType)
.FirstOrDefault();
this.typeCache.TryAdd(actorName, type);
return this.typeCache[actorName];
}
public Props Create<TActor>()
where TActor : ActorBase
=> this.Create(typeof(TActor));
public Props Create(Type actorType)
=> this.system.GetExtension<DIExt>().Props(actorType);
public void Release(ActorBase actor)
{
if (!this.references.TryGetValue(actor, out IResolverContext lifetimeScope))
return;
lifetimeScope.Dispose();
this.references.Remove(actor);
}
}
}
However, I'm not sure that everything is done correctly. I especially doubt the necessity of using the type cache and implementing the GetType method.
Related
I run Hangfire on ASP.NET Core.
For our other projects we have CorrelationIds that we pass when making API calls to be able to link the caller and callee.
We use the IHttpContextAccessor's TraceIdentifier for this in ASP.NET Core.
Unfortunately it looks like the trick used by ASP.NET Core to get a scoped CorrelationId in the Transient IHttpContextAccessor doesn't work for Hangfire job execution.
Using a Scoped state correlation object doesn't work because it must be Transient to be able to work with the rest of the system (logging etc.)
I used to be able to get away using the ServiceLocator anti-pattern and resolve a scoped state object in a transient service.
In the latest ASP.NET Core that is no longer supported and an exception is thrown making the system too slow because of the huge number of exceptions thrown.
Is there something that Hangfire provides already that would give me a unique ID per job execution?
Cheers.
Thanks to jbl's comment I looked at what I was doing again and managed to get it working through a kludge.
I've got the transient state holder
(basically it's the HttpContextAccessor class renamed):
public class StateHolder
{
private static AsyncLocal<ContextHolder> _contextCurrent = new AsyncLocal<ContextHolder>();
public string State {
get {
return _contextCurrent.Value?.Context;
}
set {
var holder = _contextCurrent.Value;
if (holder != null)
{
holder.Context = null;
}
if (value != null)
{
_contextCurrent.Value = new ContextHolder { Context = value };
}
}
}
private class ContextHolder
{
public string Context;
}
}
and then in Hangfire I hook it up to the activation with
public class LoggingActivator : JobActivator
{
private readonly IServiceScopeFactory _serviceScopeFactory;
private readonly ContextAccessor _contextAccessor;
public LoggingActivator([NotNull] IServiceScopeFactory serviceScopeFactory, ContextAccessor contextAccessor)
{
_serviceScopeFactory = serviceScopeFactory ?? throw new ArgumentNullException(nameof(serviceScopeFactory));
_contextAccessor = contextAccessor;
}
public override JobActivatorScope BeginScope(JobActivatorContext context)
{
return new LoggingActivatorScope(_serviceScopeFactory.CreateScope(), _contextAccessor);
}
}
and
public class LoggingActivatorScope : JobActivatorScope
{
private readonly IServiceScope _serviceScope;
private readonly ContextAccessor _contextAccessor;
public LoggingActivatorScope(
[NotNull] IServiceScope serviceScope,
ContextAccessor contextAccessor)
{
_serviceScope = serviceScope ?? throw new ArgumentNullException(nameof(serviceScope));
_contextAccessor = contextAccessor;
}
public override object Resolve(Type type)
{
_contextAccessor.Context = Guid.NewGuid().ToString();
return ActivatorUtilities.GetServiceOrCreateInstance(_serviceScope.ServiceProvider, type);
}
public override void DisposeScope()
{
_serviceScope.Dispose();
}
}
That seems to work fine.
Can someone guide me on how I configure Automapper in Structuremap? Currently, I have this service that will be using the IMapper.
public class RequestService : IRequestService
{
private readonly IMapper _mapper;
private readonly IRepositoryWrapper _repositoryWrapper;
public RequestService(IMapper mapper, IRepositoryWrapper repositoryWrapper)
{
_mapper = mapper;
_repositoryWrapper = repositoryWrapper;
}
public void GetSomething()
{
var result = _repositoryWrapper.RequestRepository.GetAll();
_mapper.Map<RequestDto>(result);
}
}
On the other hand, this is my Registry. This is also the place where I configure my automapper.
public class InfrastructureRegistry : Registry
{
public InfrastructureRegistry()
{
var mapperConfiguration = new MapperConfiguration(cfg => {
cfg.AddProfile(typeof(MapperProfile));
});
var mapper = mapperConfiguration.CreateMapper();
For<IMapper>().Use(mapper);
Scan(
scan => {
scan.TheCallingAssembly();
scan.AssemblyContainingType<IRequestService>();
scan.AssemblyContainingType<IRepositoryWrapper>();
scan.WithDefaultConventions();
});
For<IRequestService>().Use<RequestService>();
For<IRepositoryWrapper>().Use<RepositoryWrapper>();
}
}
During testing, I get this error message.
StructureMap.StructureMapConfigurationException: 'No default Instance is registered and cannot be automatically determined for type 'AutoMapper.IMapper'
I'm using the below version of:
Automapper = 10.1.1
StructureMap.WebApi2 = 3.0.4.125
StructureMap = 3.0.4.125
Hope someone can guide me on this.
TIA!
I've been following the NServiceBus samples, specifically for how to use an entity framework (core) DbContext integrated with Sql Persistence so that I can save dbcontext state changes along with the outbox messages. This is the sample: https://docs.particular.net/samples/entity-framework-core/
I've modified the unit of work code a little to support creation of an aspnet core DI scoped DbContext. The relevant code follows:
public class UnitOfWork<TDbContext>
where TDbContext : DbContext
{
private Func<SynchronizedStorageSession, IServiceProvider, TDbContext> _contextFactory;
private TDbContext _context;
private IServiceProvider _serviceProvider;
public UnitOfWork(Func<SynchronizedStorageSession, IServiceProvider, TDbContext> contextFactory, IServiceProvider serviceProvider)
{
_contextFactory = contextFactory;
_serviceProvider = serviceProvider;
}
public TDbContext GetDataContext(SynchronizedStorageSession storageSession)
{
if (_context == null)
{
_context = _contextFactory(storageSession, _serviceProvider);
}
return _context;
}
}
public class UnitOfWorkSetupBehavior<TDbContext> : Behavior<IIncomingLogicalMessageContext>
where TDbContext : DbContext
{
private readonly Func<SynchronizedStorageSession, IServiceProvider, TDbContext> _contextFactory;
private readonly IServiceScopeFactory _serviceScopeFactory;
public UnitOfWorkSetupBehavior(Func<SynchronizedStorageSession, IServiceProvider, TDbContext> contextFactory, IServiceScopeFactory serviceScopeFactory)
{
_contextFactory = contextFactory;
_serviceScopeFactory = serviceScopeFactory;
}
public override async Task Invoke(IIncomingLogicalMessageContext context, Func<Task> next)
{
using (var scope = _serviceScopeFactory.CreateScope())
{
var uow = new UnitOfWork<TDbContext>(_contextFactory, scope.ServiceProvider);
context.Extensions.Set(uow);
await next().ConfigureAwait(false);
context.Extensions.Remove<UnitOfWork<TDbContext>>();
}
}
}
public static class EndpointConfigurationExtensions
{
public static void RegisterUnitOfWork<TDbContext>(this EndpointConfiguration endpointConfiguration, IServiceScopeFactory serviceScopeFactory)
where TDbContext : DbContext
{
var pipeline = endpointConfiguration.Pipeline;
pipeline.Register(new UnitOfWorkSetupBehavior<TDbContext>((storageSession, serviceProvider) =>
{
var dbConnection = storageSession.SqlPersistenceSession().Connection;
var dbContextFactory = serviceProvider.GetService<IDbContextConnectionFactory<TDbContext>>();
var dbContext = dbContextFactory.GetDbContext(dbConnection);
//Use the same underlying ADO.NET transaction
dbContext.Database.UseTransaction(storageSession.SqlPersistenceSession().Transaction);
//Call SaveChanges before completing storage session
storageSession.SqlPersistenceSession().OnSaveChanges(x => dbContext.SaveChangesAsync());
return dbContext;
}, serviceScopeFactory), "Sets up unit of work for the message");
}
}
public static class UnitOfWorkContextExtensions
{
public static TDbContext DataContext<TDbContext>(this IMessageHandlerContext context)
where TDbContext : DbContext
{
var uow = context.Extensions.Get<UnitOfWork<TDbContext>>();
return uow.GetDataContext(context.SynchronizedStorageSession);
}
}
For this to work the behavior needs an injected IServiceScopeFactory.
Now all examples I've been able to find of behavior registration only show the type manually instantiated and passed in to the endpointconfiguration's pipeline.
Is there a way to either gain access to an IServiceScopeFactory via the behavior's Invoke method (maybe by the context via some extension perhaps?), or is it possible to register the behavior itself such that I can construct it with services created by the DI container?
FYI I took a look at this Q&A which gave me the idea of injecting the IServiceScopeFactory. Unfortunately, the answer doesn't show how to actually get an instance of the interface.
You would use context.builder.Build<T>(); within the Invoke method to resolve any objects like IServiceScopeFactory.
https://docs.particular.net/samples/multi-tenant/di/
Make sure that the IServiceScopeFactory is registered in the DI container. For example, during your endpoint initialization:
endpointConfiguration.RegisterComponents(registration: x =>
{
x.ConfigureComponent<IServiceScopeFactory>(yourServiceScopeFactory);
});
https://docs.particular.net/nservicebus/dependency-injection/
You can also do this by creating a Feature
https://docs.particular.net/nservicebus/pipeline/features
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'm trying to configure Castle Windsor with NHibernate and Castle.Facilities.AutoTx, but I keep getting problems with the PerTransactionLifeStyleOption. If I do
var sessionFactory = Container.Resolve<Func<ISession>>();
var session = sessionFactory();
I get the following exception (on the second line above):
Castle.Facilities.AutoTx.MissingTransactionException:
No transaction in context when trying to instantiate model 'NHibernate.ISession'
for resolve type 'NHibernate.ISession'. If you have verified that your call
stack contains a method with the [Transaction] attribute, then also make sure
that you have registered the AutoTx Facility.
at Castle.Facilities.AutoTx.Lifestyles.PerTransactionLifestyleManagerBase.Resolve(CreationContext context) in d:\Builds\Castle.Transactions-beta\src\Castle.Facilities.AutoTx\Lifestyles\PerTransactionLifestyleManagerBase.cs:line 153
at Castle.Facilities.AutoTx.Lifestyles.WrapperResolveLifestyleManager`1.Resolve(CreationContext context) in d:\Builds\Castle.Transactions-beta\src\Castle.Facilities.AutoTx\Lifestyles\WrapperResolveLifestyleManager.cs:line 143
at Castle.MicroKernel.Handlers.DefaultHandler.ResolveCore(CreationContext context, Boolean requiresDecommission, Boolean instanceRequired)
at Castle.MicroKernel.Handlers.AbstractHandler.Resolve(CreationContext context, Boolean instanceRequired)
at Castle.MicroKernel.Handlers.AbstractHandler.Resolve(CreationContext context)
at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service, IDictionary additionalArguments)
at Castle.MicroKernel.DefaultKernel.Resolve(Type service, IDictionary arguments)
at Castle.Facilities.TypedFactory.TypedFactoryComponent.Resolve(IKernel kernel)
at Castle.Facilities.TypedFactory.Resolve.Invoke(IInvocation invocation)
at Castle.Facilities.TypedFactory.TypedFactoryInterceptor.Intercept(IInvocation invocation)
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Castle.Proxies.Func`1Proxy.Invoke()
at IntegrationTest.NCVIB.WindsorIoC.LocalDbTest.get_Reader() in D:\Projects\NCVIB-GIT\NCVIB\src\IntegrationTest.NCVIB\WindsorIoC\LocalDbTest.cs:line 22
at IntegrationTest.NCVIB.InspectionObjectMapTests.ReadWrite() in D:\Projects\NCVIB-GIT\NCVIB\src\IntegrationTest.NCVIB\InspectionObjectMapTests.cs:line 34
Here's a compilation of the setup calls I'm making (They're actually spread out across several different installers):
container.AddFacility<AutoTxFacility>();
container.Register(Component.For<INHibernateInstaller>().Instance(new FluentNHibernateInstaller));
container.AddFacility<NHibernateFacility>(fac => fac.Option = DefaultSessionLifeStyleOption.SessionPerTransaction);
The FluentNHibernateInstaller is shown here:
public class FluentNHibernateInstaller : INHibernateInstaller
{
public FluentConfiguration BuildFluent()
{
return Fluently.Configure()
.Database(
MsSqlConfiguration.MsSql2005
.DefaultSchema("dbo")
.ConnectionString(b => b.Is(ConnectionString ?? ConnectionStringChooser.GetConnectionString())))
.Cache(c => c.UseQueryCache().ProviderClass<SysCacheProvider>())
.Mappings(m => m.FluentMappings.AddFromAssemblyOf<UserMap>().Conventions.AddFromAssemblyOf<EnumConvention>())
.ExposeConfiguration(
c => c.SetProperty(Environment.SqlExceptionConverter, typeof (MsSqlExceptionConverter).AssemblyQualifiedName))
.ExposeConfiguration(c => c.SetProperty(Environment.ShowSql, "true"));
}
public string ConnectionString { get; set; }
public void Registered(ISessionFactory factory)
{
}
public bool IsDefault
{
get { return true; }
}
public string SessionFactoryKey
{
get { return "default.sf"; }
}
public Maybe<IInterceptor> Interceptor
{
get { return Maybe.None<IInterceptor>(); }
}
}
It turns out that that the AutoTxFacility MUST be added to the container before any any component that has a [Transaction] attribute.
I was adding the facility in one of a few IWindsorInstaller classes in which the order of installation was "random" causing the facility to be installed AFTER some of my components with transactional methods:
var container = new WindsorContainer();
container.Install(FromAssembly.This);
But now I am adding the facility BEFORE installing from my installer classes:
var container = new WindsorContainer();
container.AddFacility<AutoTxFacility>();
container.Install(FromAssembly.This());
Here is what the usage would be like:
public class MyClass
{
private readonly Func<ISession> _sessionFactory;
public MyClass(Func<ISession> sessionFactory)
{
_sessionFactory = sessionFactory;
}
[Transaction]
public virtual void UseTheSessionForSomething()
{
// The transaction (and session) will be initialized
// because of the
// [Transaction] attribute
// AND this method is virtual
// AND this instance was resolved from the container
MethodWithinTransactionScope();
}
public void MethodWithinTransactionScope()
{
// Method just needs to be invoked in the scope of a transaction
var session = _sessionFactory();
session.Get<Entity>(1);
}
}
public void Test()
{
var myInstance = container.Resolve<MyClass>();
myInstanace.UseTheSessionForSomething();
}
Is the exception says; the answer is to add a transaction around the method with the line of code: var session = sessionFactory();
If you are getting the exception and HAVE added [Transaction] on that method, then you are not resolving the service LocalDbTest properly.
Have a look at my quick-start for a quick-start:
https://github.com/haf/Castle.Facilities.NHibernate/wiki/NHibernate-Facility---Quick-Start
I'm reading your code now ;), the reason that it was missing was because of this line:
https://github.com/haf/Castle.Transactions/blob/master/src/Castle.Facilities.AutoTx/AutoTxFacility.cs#L86
It's a known 'TODO' that you have to register your facility before your components, and I think this is stated in the quickstart as well.
Cheers