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How do you choose which controller type to implement We believe this decision has a lot to do with you and how you think about how requests are processed If you are comfortable with how the standard servlet model works, then you will feel right at home with the Controller interface Controllers are typically implemented and deployed as singletons, therefore all requests for the same resource (or page) are routed through the same instance This design forces you to keep all of the state for the request outside the Controller, instead in places such as the HttpSession or stateful session beans The advantage of this design is that it is very familiar (Struts Actions follow this design, as well as standard servlets, for example) and very scalable due to the stateless nature of the request processing and its minimal impact on garbage collection.

Maximum bandwidth Power consumption (battery life) Maximum distance Hardware costs Footprint of protocol stack Industry standard Frequency Maximum number of network nodes Spreading

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If you prefer to think about the incoming request as a thing to be executed, then you might find the ThrowawayController easier to work with (fans of WebWork (http://wwwopensymphony com/webwork), I m talking to you) With this controller type you are not restricted to writing stateless controllers, as this controller encapsulates both state (parameters from the request) and behavior (the execute() method) Although we still recommend that you delegate business logic to the domain model, if you like programming to a model where the command is encapsulated as first-class citizen, this controller is for you As with all things in Spring MVC, the choice is yours, and there is no intrinsic bias toward one method or the other Feel free to mix and match controller types in the same application to give yourself ultimate flexibility.

One might expect that the overload Console::WriteLine( String^ formatString, Object^ arg ) should match, because the first argument passed matches String^ and the type of the second argument is Object^, which is known as the ultimate root However, there is no standard conversion from int* to Object^ Trying to use a cast to Object^ will also fail: Console::WriteLine("pi = {0}", (Object^)pi); // error: cannot convert from int* to Object^.

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If you are unsure, fear not! We will cover both in detail in this chapter One thing to note, however, is that Spring MVC appears to favor Controllers over ThrowawayControllers, simply by the number of implementations available for Controller..

As discussed in 2, a variable of type Object^ is a reference to a managed object on the GC heap. Apart from a few rare cases, native pointers refer to native memory, not into the managed heap. Therefore, it makes sense that a conversion cannot be done. If a native pointer were a value type, it would be boxed so that an Object^ could refer to a new managed object that contains the native pointer value. Native pointers are not treated like value types, but there is a special managed value type that encapsulates native pointers: System::IntPtr. To pass a pointer to WriteLine, you can wrap it in System::IntPtr, as shown in the following code: Console::WriteLine("pi = {0}", IntPtr(pi)); // this code works Since System::IntPtr is a managed value type, it can be boxed to be passed as an Object^. Just as the IL uses the keyword int32 for System::Int32, the keyword native int is used for the type System::IntPtr.

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To review, the Controller interface (presented again in Listing 6-1) contains a simple, stateless method that accepts an HttpServletRequest and an HttpServletResponse and optionally returns a ModelAndView. In true Spring MVC style, there are many Controller implementations to choose from, each building upon its superclass to extend its life cycle and work flow. Listing 6-1. Controller Interface public interface Controller { ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception; }

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Before we begin our tour of the different Controllers, we will first discuss one of the important design principles behind the class hierarchy. When studying the different Controllers, new users encounter plenty of methods marked final. These are often encountered when a user wishes to add functionality to a subclass of a Controller implementation but is prohibited from doing so. These final methods can be frustrating, but they are there for an important reason.

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