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An Application Controller has two main responsibilities: deciding which domain logic to run and deciding the view with which display the response To do this it typically holds two structured collections of class references, one for domain commands to execute against in the domain layer and one of views (Figure 1410)
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Figure 1410 An application controller has two collections of references to classes, one for domain logic and one for view
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For both the domain commands and the view, the application controller needs a way to store something it can
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invoke A Command [Gang of Four] is a good choice, since it allows it to easily get hold of and run a block of code Languages that can manipulate functions can hold references to them Another option is to hold a string that can be used to invoke a method by reflection
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The domain commands can be command objects that are part of the Application Controller layer, or they can be references to a Transaction Script (110) or domain object methods in the domain layer
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If you're using server pages as your views, you can use the server page name If you're using a class, a command or a string for a reflective call makes sense You might also use an XSLT transform, to which the Application Controller can hold a string as a reference
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One decision you'll need to make is how much to separate the Application Controller from the rest of the presentation At the first level this decision manifests itself in whether the Application Controller has dependencies to the UI machinery Perhaps it directly accesses the HTTP session data, forwards to a server page, or invokes methods on a rich-client class
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Although I've seen direct Application Controllers, my preference is for the Application Controller to have no links to the UI machinery For a start this makes it possible to test the Application Controller independently of the UI, which is a major benefit It's also important to do this if you're going to use the same Application Controller with multiple presentations For these reasons many people like to think of the Application Controller as an intermediate layer between the presentation and the domain
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An application can have multiple Application Controllers to handle each of its different parts This allows you to split up complex logic into several classes In this case I usually see the work divided up into broad areas of the user interface and build separate Application Controllers for each area On a simpler application I might need only a single Application Controller
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If you have multiple presentations, such as a Web front end, a rich client, and a PDA, you may be able to use the same Application Controller for each presentation, but don't be too eager Often different UIs need a different screen flow to achieve a really usable user interface However, reusing a single Application Controller may reduce the development effort, and that decreased effort may be worth the cost of a more awkward UI
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A common way of thinking about a UI is as a state machine, where certain events trigger different responses depending on the state of certain key objects in the application In this case the Application Controller is particularly amenable to using metadata to represent the state machine's control flow The metadata can either be set up by programming language calls (the simplest way) or it can be stored in a separate configuration file
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You may find domain logic particular to one request placed in an Application Controller (379) As you might suspect, I come down pretty hard against that notion However, the boundary between domain and application logic does get very murky Say I'm handling insurance applications and I need to show a separate screen of questions only if the applicant is a smoker Is this application logic or domain logic If I have only a few such cases I can probably put that kind of logic in the Application Controller (379), but if it occurs in lots of places I need to design the Domain Model (116) in such a way to drive this
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