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Using Castle Windsor to inject IRailsEngineContext

Answer 1

+1 A:

Container.Register(
    Component.For<IRailsEngineContext>()
             .UsingFactoryMethod(()=>MonoRailHttpHandler.CurrentContext)
             .LifeStyle.Transient
);

IRailsEngineContext - that's from an old version of MonoRail I guess. I'd advise you move to a newer one, the sooner the better.

Ken Egozi 2009-06-16 20:35:24

btw - take notice not to inject this into Singleton services - these will resolve only once, and will use the first Context for concecutive requests.If you have to use the context on a Singlton, use MRHttpHandler.CurrentContext directly, or inject it with a custom IContextProvider that asks the handler for the current context each time.

Ken Egozi 2009-06-16 20:38:23

@Ken: you can register this with a transient or PerWebRequest lifestyle and the lambda factory will get called as expected.

Mauricio Scheffer 2009-06-17 02:33:24

@mausch - not if it is a dependency of a singleton.Say class Something { ... public Something (IEngineContext context); }and Something is registered as a Singleton.the first time Something is being resolved, the factory method will generate the correct context.on a consecutive request, the same ol' instance of Something will be served, holding a reference to the **old** context, (which is the *wrong* context)That's true for any non-singleton service that is a dependency of a singleton service

Ken Egozi 2009-06-17 06:41:21

@ken: but that's about other components' lifestyles, not this one... If I have a transient component Foo that depends on IRailsEngineContext and I register IRailsEngineContext as singleton (like the code on your answer), then Foo will get an invalid IRailsEngineContext on a consecutive request. By registering IRailsEngineContext as transient this case is solved. Now if Foo is a singleton and it depends on a transient, that's Foo's problem.

Mauricio Scheffer 2009-06-17 16:11:33

This is just like the case I blogged about a while ago: http://bugsquash.blogspot.com/2008/12/castle-windsor-factory-method-support.html which in turn gave origin to UsingFactoryMethod() only I used System.Web.Abstractions in this post instead of Monorail stuff.

Mauricio Scheffer 2009-06-17 16:17:27

@mausch - oopise, my bad. I thought you mean the other way around, and I forgot to include the LifeStyle setting on registration. fixed, thx.

Ken Egozi 2009-06-17 20:23:49

Is there a way to do this via XML configuration?

Jonathon Watney 2009-07-08 21:46:19

@Jonathon: of course. The FactorySupport facility started in the old XML days.http://www.castleproject.org/container/facilities/trunk/factory/index.htmlhttp://blog.codiceplastico.com/?p=143

Ken Egozi 2009-07-09 11:30:05

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