I caught a few interesting posts this week that reminded me of an unfinished series on .NET web frameworks I started in 2009. The series, as it was initially planned, ties in very well with a recent post from Chad Myers, who responded to another post claiming the ActiveRecord (and Rails) Considered Harmful.
Before I go any further, I want to make very clear that I’m a fan of Rails and think that it is an incredibly useful framework for building certain applications. I think the same is true of ASP.NET MVC. I’ve used and use both. However, I don’t think that means these are the best approach for tackling HTTP.
Chad’s post was very good. I agree with almost all of his points. In particular, I think he hit several very important points, the biggest of which was his emphatic quote:
INHERITANCE IS FAIL FOR MOST DESIGNS, BUT NEVER MORE SO THAN IN WEB/MVC FRAMEWORKS!
Then from his list of criteria for a “perfect” web framework:
- Completely compositional: 100% agree
- [Resource]-based: I take a slightly different direction here. We talk about “models”, but if you are really thinking about HTTP, you should be thinking in terms of resources. They are similar in many ways, notably in the sorts of “behaviors” (in FubuMVC terms) that should be composed with the “model.” Honestly, it’s the “model” term itself that seems totally overloaded or at least at the wrong layer when talking about a framework. If you have a model, you’re probably really dealing with something more like DDD than the HTTP application layer.
- Not have any notion of controllers: Agree. In MVC-style frameworks, they are sort of necessary, but if you break away from MVC, you’ll find there are better alternatives.
- Action-based: I’m all about using functions, or delegates, as
'Request -> 'Responsehandlers. I also agree that these should generally be kept simple, relying on compositional helpers, middlewares, or whatever you want to call them to perform model-binding and response generation. Granted, this is slightly different than what Chad is talking about, and I’ll cover my thoughts on this in more detail below.
- Minimized code-in-view: templates are helpful, but the ability to add a lot of logic is just asking for trouble. I really like the tags-as-code approach taken by WebSharper and Wing Beats.
- Independent of other frameworks: Definitely limit other dependencies and play nice with others.
- Testing as a first-class citizen: At least allow whatever the consumer writes to easily write real unit tests. Generally, the only reason you can’t do this is related to hosting, so make sure the hosting model is not necessary to test the application.
Okay, so I obviously skipped some items. I don’t think the other items are bad; I just don’t think they are necessary for a “perfect” web framework.
- Total adherence to principles: This sounds really good. I don’t disagree, really, but exactly which principles? Principles sometimes change. Some make sense in one approach to software development and are sort of non-issues in others. Look at the description of SOLID and its relevance to F#. You’ll note that many of the principles are sort of non-issues.
- Statically typed: I don’t really see this as a requirement. HTTP is inherently dynamic. You could build a useful, fairly complex HTTP application using only dictionaries. Reliance upon type serialization is misguided. How do you generate accurate Atom or HTML from a static type? You don’t. You need a template or some other custom output. At the same time, I have grown to like static type-checking, espeically in F#, and F# 3.0’s Type Providers prove you can do a lot, even type check regular expressions. I just don’t see this as a strict requirement.
- Based on IoC: I love IoC in C# applications. I can’t imagine life without it. However, I’ve found that I don’t even think about IoC when writing F# applications. It’s just not a concern. Higher-order functions, computation expressions, and other functional-style approaches generally render IoC a non-issue. So again, I don’t really see this as a requirement but a case of “use the right tool for the job.”
- Mostly model-based conventional routing: This is a totally fine solution. I take issue with having any single prescription for routing. There are so many ways to handle this, and in the end it doesn’t matter. If you stick to a resource-oriented approach, which perhaps is the goal Chad is getting at, then your routing should be pretty straightforward and simple. One thing many routers miss is the connection between different methods assigned to a single uri. So far as I know, OpenRasta and Web Api are the only frameworks that return the appropriate HTTP status codes for missing methods on an uri or unmatched Accept header, among other things. FubuMVC may allow this through a convention.
- One Model In, One Model Out: When using MVC, I generally like this approach. However, I again don’t see this as a requirement. I’m not convinced a model is always necessary. Again, HTTP is quite dynamic, and it’s sometimes easier to work directly with a request or pull out several different “objects” from a request to help generate a response. Though perhaps
'Responseare models and the point is moot. 🙂
Now for the biggest divergence: I generally prefer to be explicit rather than lean on conventions. In C#, I typically go for conventions because of the amount of noise required by the C# syntax. With F#, I’m able to be explicit without suffering syntax noise overload. The same is true for many dyanmic languages like Ruby and Python. So I disagree with both the Conventional top-to-bottom and Zero touch points. Again, I’m not fully opposed, but I definitely don’t see these as requirements at the framework level. Sure, include it as an option, especially if, as in FubuMVC, you can redefine the conventions to suit your needs. This could just mean use the right tool for the job, or it could mean you should take a simpler approach and build your own conventions as wrapper functions.
If you think this sounds like a prescription to write a lot more code, I’ll show a comparison:
Two extra lines (in this instance) and it’s likely with a more complex example you wouldn’t see much of a difference in terms of line count. I doubt this is true with C#, so don’t take this as a statement that this is the “one, true way.” I like conventions when using C#, just as I like IoC in C#.
In any case, definitely check out FubuMVC as an alternative to MVC. There’s a lot to like, and the FubuMVC team has done an incredible job building a terrific platform. I’ll try to highlight a few others in the upcoming weeks, but while you’re looking at Fubu, also checkout OpenRasta and ServiceStack.