How to get service type without resolving the service?

[mynkow]

Hi,

I have an interface ISomeService and two concrete implementations SSA and SSB. Depending on a configuration container.Resolve<ISomeService>() will return SSA or SSB. Is it possible to get the type which will be resolved without resolving and creating an instance. For example something like this: var theServiceType = container.TheServiceResolvedWillBeOfType<ISomeService>()

Best regards

mynkow

[mynkow]

Type theServiceType = container.TheServiceResolvedWillBeOfType<ISomeService>()

[Patrick Steele]

I don't see anything in the API for that.

And this begs the question, "Why do you want to know that?" A
loosely-coupled design wouldn't care of the type -- only the
interface. What are you trying to accomplish?

---
Patrick Steele
http://weblogs.asp.net/psteele

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[mynkow]

I have 3 assemblies. Each one has EventHandlers. Only one assembly will work at the same time.

I have IEventBus and OnCreate method within component registration I register only the event handlers from the active assembly;

container.Register(Component.For<IEventBus>().ImplementedBy<InProcessEventBus>().OnCreate((kernel, eventBus) =>
            {
                (eventBus as InProcessEventBus).RegisterAllHandlersInAssembly(Assembly.GetAssembly(typeof(IHaveEventHandlers)), kernel.Resolve, kernel.ReleaseComponent);

                var loginProvider = container.Resolve<ILoginProvider>();
                if (loginProvider.LoginProviderType == LoginProvider.DB_LoginProvider)
                    (eventBus as InProcessEventBus).RegisterAllHandlersInAssembly(Assembly.GetAssembly(typeof(IHaveDbLoginProviderEventHandlers)), kernel.Resolve, kernel.ReleaseComponent);
                else if (loginProvider.LoginProviderType == LoginProvider.LDAP_LoginProvider)
                    (eventBus as InProcessEventBus).RegisterAllHandlersInAssembly(Assembly.GetAssembly(typeof(IHaveLdapLoginProviderEventHandlers)), kernel.Resolve, kernel.ReleaseComponent);
            }));

[Patrick Steele]

Sorry for dropping off. Got super busy...

What part of the code below is causing you the problem? I'm really
tired, but trying to figure out a more elegant way to do this without
knowing the type that is going to be resolved.

---
Patrick Steele
http://weblogs.asp.net/psteele

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[mynkow]

Hi Patrick

Each login provider has hardcoded property to identify itself and also each login provider brings its own event handlers. As I said only 1 login provider will be available at the same time.

When the EventBus is started for first time I scan assemblies for EventHandlers. So depending the instance from var loginProvider = container.Resolve<ILoginProvider>(); 
I register the proper EventHandlers. The problem is that I have to resolve ILoginProvider but actually the only thing I need is metadata.

cheers