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with the constant creation of objects. The overhead of creating a new instance of ThrowawayController is nearly negligible. As always, if under doubt, run your system with a profiler under heavy load and watch for garbage collection performance.
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For an example of a ThrowawayController, we will add a CancelAccountController (Listing 6-75) to the system. A form will request an Account s username, and the Controller will attempt to find the account and then cancel it. Listing 6-75. CancelAccountController public class CancelAccountController implements ThrowawayController { private AccountService accountService; private String username; public void setUsername(String username) { this.username = username; } public void setAccountService(AccountService accountService) { this.accountService = accountService; }
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CHAPTER 6 THE CONTROLLER MENAGERIE
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public ModelAndView execute() throws Exception { if (!StringUtils.hasText(username)) { return new ModelAndView("cancelAccount", "errorMessage", "Username must not be blank."); } try { accountService.cancelAccount(username); return new ModelAndView("cancelAccountSuccess"); } catch(AccountNotFoundException e) { return new ModelAndView("cancelAccount", "errorMessage", "No account found with username " + username); } } } Configuring this Controller is similar to all other Controllers, except you must specify singleton="false" in the bean definition. This will ensure a new instance is created for every request. Otherwise, each request will use the same instance of the Controller and risk overwriting the property values. Listing 6-76 contains the bean definition for the CancelAccountController. Listing 6-76. CancelAccountController Bean Definition <bean name="/cancelAccount" singleton="false" class="com.apress.expertspringmvc.flight.web.CancelAccountController"> <property name="accountService" ref="accountService" /> </bean>
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Caution Neither the DispatcherServlet nor the ThrowawayControllerHandlerAdapter will provide a warning if the controller is a singleton, so double-check your ThrowawayControllers are indeed prototypes.
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It should be noted that the ThrowawayController requires its own ThrowawayController HandlerAdapter to function. If you have specified and configured one or more handler adapters in your WebApplicationContext, you will need to also include ThrowawayController HandlerAdapter if you choose to use that type of controller. By default, the DispatcherServlet will include both SimpleControllerHandlerAdapter and ThrowawayControllerHandlerAdapter, but it will ignore the defaults if at least one handler adapter is explicitly declared in the WebApplicationContext. As you can tell, there is no way to handle any sort of data binder errors inside the Controller. If an error does occur, the ServletRequestBindingException will be thrown by the handler adapter, and it will be left up to any exception resolvers found in the WebApplicationContext to properly deal with the exception. This is probably not what you want, so if a binding error could occur while populating the ThrowawayController, you will need to instead implement a ValidatableThrowawayController (covered in the next section).
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The ThrowawayController is an alternate request handling method compared to the Controllers we ve seen so far. It is intended to encapsulate both the request parameters as well as the behavior associated with the request. A new ThrowawayController is created for each request, so it must be a prototype bean (by specifying singleton="false" in the bean definition). Request parameters are bound directly to the controller, and if there are no data binding errors, the controller s execute() method is called to handle the request.
ValidatableThrowawayController
The standard ThrowawayController can t support any fine grained data binding configuration because there is no callback to specify any custom PropertyEditors. If there are any data binding errors, the controller never knows about them, making proper error handling cumbersome. Enter the ValidatableThrowawayController, as shown in Listing 6-77, which adds a bit more complexity but fills in the gaps of error handling. This controller type is still a stateless Command pattern implementation of a controller, so you should use it wherever you would use a ThrowawayController but require the ability to register custom PropertyEditors or build work flows that take into account any errors. Listing 6-77. ValidatableThrowawayController public interface ValidatableThrowawayController { String getName(); void initBinder(DataBinder binder) throws Exception; ModelAndView execute(BindException errors) throws Exception; } If you wish to use this controller, you must also declare a ValidatableThrowaway ControllerHandlerAdapter in your WebApplicationContext. If you do, be sure to also include any other handler adapters, as the defaults are only included if no handler adapter is found in the ApplicationContext.
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