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The Servlet 2.3 specification introduced the idea of filters, common code that can wrap one or more servlets to provide pre- and post-processing of the request and response. Spring MVC supports an analogous concept with its HandlerInterceptors, which wrap request handlers to provide common functionality. Interceptors handle more life cycle events than a standard filter, but filters are more powerful, in that they may directly manipulate or replace the HttpServletRequest and HttpServletResponse objects. Listing 6-78 contains the HandlerInterceptor interface.

public class MyNinjectControllerFactory : DefaultControllerFactory { private IKernel _kernel; public MyNinjectControllerFactory(IKernel kernel)

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Listing 6-78. HandlerInterceptor Interface public interface HandlerInterceptor { boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception; void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception; void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception; } Three life cycle points can be intercepted. See Table 6-4. Table 6-4. Interceptor Life Cycle Points

Listing 3-13 demonstrates the build-in functions of the Duration data type. In the third statement, variable d of Duration data type is converted to minutes using the toMinutes() function. Likewise, the toSeconds() and toMillis() functions are used in the fourth and fifth statements. In addition to the conversion functions, Duration values can be added, subtracted , multiplied and divided using built-in functions as shown in the last four statements.

{ _kernel = kernel; } protected override IController GetControllerInstance( RequestContext requestContext, Type controllerType) { return _kernel.Get(controllerType) as IController; } }

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Called before the request handler is invoked. If it returns false, the request handler is never invoked, and the rest of the interceptor s methods are never called. Called after the handler finishes but before the view is rendered. Useful for placing common objects into the model.

The controller factory will need access to the kernel in order to resolve types, so we pass it to the constructor and hang on to it in a private member variable. You can see the naming convention that we defined earlier in action here. We take the controller s type name, make it lowercase, remove the word Controller, and then use that to match the correct controller inside the kernel. Can you guess what the last step is Yep, we just need to wire up this new controller factory in Application_Start:

ControllerBuilder.Current.SetControllerFactory( new MyNinjectControllerFactory(NinjectBootstrapper.Kernel) );

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Type conversion or typecasting refers to changing the value of a variable from one data type into another. This is done to take advantage of certain features of type hierarchies. For instance, values from a more limited set, such as integers, can be stored in a more compact format and later converted to a different format, enabling operations that would not otherwise be possible, such as division with several decimal places of accuracy when there is a need for that. Casting can be implicit or explicit. Implicit casting are safe and handled by the compiler itself. Normally, upcasting is implicit whereas downcasting requires explicit notation in the code. Listing 3-14 shows an example. Listing 3-14. An example of typecasting var d: Number = 10.0; var l:Integer = 2; d = l; // This is implicit casting

afterCompletion Called after the view is rendered, even if there was an error in handling the request. Useful for resource cleanup.

If you build and run the application now, you should see the new message, though all we did was change the IoC plumbing. Your screen should look something like figure 13.3. There s another popular IoC framework called Windsor that we ll cover next.

Our simple example of a HandlerInterceptor (shown in Listing 6-79) will insert the current time into the model after the controller has finished, but before the view is rendered. The difficult part of using interceptors is not in implementing them but in configuring them. Listing 6-79. HandlerInterceptor Example public class DateInsertionInterceptor implements HandlerInterceptor { public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { return true; // always continue } public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { modelAndView.addObject("currentTime", new Date()); }

Figure 13.3 Our controller is now provided with a Ninject-specific IMessageProvider, but the controller doesn t know (or care).

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