Comments on: Advanced StructureMap: connecting implementations to open generic types

By: corey coogan

corey coogan — Fri, 22 Jan 2010 15:33:16 +0000

Great article Jimmy. One thing that I’m missing here is how you go about raising the events or calling the commands.

I assume you are using some sort of EventAggregator? I love what you are showing here for registering the listeners and would like some closure on the big picture.

By: Martin Nilsson

Martin Nilsson — Fri, 08 Jan 2010 11:52:12 +0000

In Windsor:

//Registration
Kernel.Register(AllTypes.Of(typeof(IHandler<>)).FromAssembly(typeof(OrderCanceledEvent).Assembly).WithService.FirstInterface());

//Implementation
public class OrderCanceledEvent : IHandler
{}

//Usage
public class SomeClass(IHandler handler)
{}

By: mob

mob — Fri, 25 Dec 2009 19:19:18 +0000

This is pretty sweet. I just knocked down all my individual repository registrations to a few lines. Thanks for pointing this out.

By: Derek Greer

Derek Greer — Mon, 21 Dec 2009 13:51:25 +0000

Very cool stuff. I added this ability to an extension I wrote for Unity (see http://bit.ly/6FcCwl) after you first tweeted about it back in August, but its features like this that have made me consider StructureMap for future projects.

By: Artem Govorov

Artem Govorov — Mon, 21 Dec 2009 00:34:56 +0000

>I’ve taken a look at the other containers, and frankly, I haven’t
>found any that match this level of simplicity in configuration. But
>I’m not an expert on the other containers, so I’d love to be
>proven wrong!
I think you’ve described special case usage of more general auto registration feature. I have implemented general auto registration solution with nice fluent syntax for Unity (see here http://autoregistration.codeplex.com/), Marcin Budny had created predicate for open generics to simplify registering them (http://marcinbudny.blogspot.com/2009/11/unity-auto-registration.html). You can have a look and compare readability and simplicity.

By: bogardj

bogardj — Sun, 20 Dec 2009 19:52:47 +0000

@Paul

This is in the trunk version, but will be in the upcoming 2.5.4 release.

@Eric

What does WithService.Base() do exactly?

By: Eric Hauser

Eric Hauser — Sun, 20 Dec 2009 14:00:08 +0000

@Jimmy/Joshua

Correct, James article does not show how to register this scenario. Here’s an example using the registration API:

kernel.Register(AllTypes.Pick().FromAssembly(Assembly.GetExecutingAssembly()).BasedOn(typeof(ICommand<>)).WithService.Base());

By: Paul Linton

Paul Linton — Sat, 19 Dec 2009 04:09:22 +0000

What version of SM has ConnectImplementationsToTypesClosing? Has it been released?
thanks

By: Joshua Flanagan

Joshua Flanagan — Fri, 18 Dec 2009 14:00:49 +0000

@Eric – that Windsor example is a little different from what Jimmy is talking about. In James example, he is explicitly telling the Windsor which concrete (Repository) type to use for the interface (IRepository).
In the StructureMap example, Jimmy never explicitly tells the container which concrete type to use. This allows concrete types with different implementations such as OrderRepository and CustomerRepository, instead of just Repository and Repository (which really have the same implementation).

By: bogardj

bogardj — Fri, 18 Dec 2009 13:40:52 +0000

@Eric Hauser

That’s not quite the same solution. In that post, you’re connecting an open generic interface to an open generic implementation. In my example, you’re connecting types that close the generic interface to its implementation.

For example, we have around 200 implementors of a Command. Registering all 200 unique implementors requires 1 line of StructureMap registration code.