SignalR dependency injection via Spring.Net - asp.net-mvc-4

Question

I'm trying to inject dependencies via Spring.NET.
First I created a custom DependencyResolver:
public class SignalRSpringNetDependencyResolver : DefaultDependencyResolver
{
private IApplicationContext _context;
public SignalRSpringNetDependencyResolver(IApplicationContext context)
{
_context = context;
}
/// <summary>
/// Gets the application context.
/// </summary>
/// <value>The application context.</value>
public IApplicationContext ApplicationContext
{
get
{
if (_context == null || _context.Name != ApplicationContextName)
{
if (string.IsNullOrEmpty(ApplicationContextName))
{
_context = ContextRegistry.GetContext();
}
else
{
_context = ContextRegistry.GetContext(ApplicationContextName);
}
}
return _context;
}
}
/// <summary>
/// Gets or sets the name of the application context.
/// </summary>
/// <remarks>
/// Defaults to using the root (default) Application Context.
/// </remarks>
/// <value>The name of the application context.</value>
public static string ApplicationContextName { get; set; }
/// <summary>
/// Resolves singly registered services that support arbitrary object creation.
/// </summary>
/// <param name="serviceType">The type of the requested service or object.</param>
/// <returns>The requested service or object.</returns>
public override object GetService(Type serviceType)
{
System.Diagnostics.Debug.WriteLine(serviceType.FullName);
if (serviceType != null && !serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass)
{
var services = ApplicationContext.GetObjectsOfType(serviceType).GetEnumerator();
services.MoveNext();
try
{
return services.Value;
}
catch (InvalidOperationException)
{
return null;
}
}
else
{
return base.GetService(serviceType);
}
}
/// <summary>
/// Resolves multiply registered services.
/// </summary>
/// <param name="serviceType">The type of the requested services.</param>
/// <returns>The requested services.</returns>
public override IEnumerable<object> GetServices(Type serviceType)
{
var services = ApplicationContext.GetObjectsOfType(serviceType).Cast<object>();
services.Concat(base.GetServices(serviceType));
return services;
}
Note that i escape interfaces and abstract classes so that I will get the default implementations of SignalR from the base DefaultDependencyResolver
and here I assigned the resolver using WebActivator:
public static void PostStart()
{
// Inject Dependencies to SignalR, should be always come before ASP.NET MVC configuration
var dependecyResolver = new SignalRSpringNetDependencyResolver(ContextRegistry.GetContext());
GlobalHost.DependencyResolver = dependecyResolver;
RouteTable.Routes.MapHubs();
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
}
However, SignalR is always trying to resolve it's own dependencies using the Resolver i assigned and i get the following error:
'myhub' hub could not be resolved.
I only need the resolver to be aware of other dependencies(my Repository for example) and keep the default implementation of SignalR services.

Answer 1

I think it's hard to get Spring.Net working with SignalR
for the current version (Spring.Net 1.3.2) it's difficult to support asynchronous programming. Spring.Net session management doesn't play well with Task<T> types.
I ended up injecting my dependencies in 2 steps:
1- registering the required type on WebActivator PostStart:
GlobalHost.DependencyResolver.Register(
typeof(IUserService),
() => (UserService)ctx.GetObject("UserService"))
2- picking them up in my Hub constructor:
public MyHub()
{
_userService =
DependencyResolver.Current.GetService<IUserService>();
}