public UserView getUserView( ) { return userView; (Web design seattle) }
public UserView getUserView( ) { return userView; } public void setUserView(UserView newView) { userView = newView; } /** * Initialize all of the required resources */ private void initialize( ) { // Create a new shopping cart for this user cart = new ShoppingCart( ); } /** * Clean up any open resources. The shopping cart is leftintact * intentionally. */ public void cleanUp( ) { setUserView( null ); } } One thing to notice is that the UserContainer class in Example 9-5 implements the HttpSessionBindingListener interface. The methods of this interface allow the UserContainer to be notified when it is bound to and unbound from the session. This allows it to perform any necessary cleanup on the object. An instance of the UserContainer is created for each new user at the time the user enters the application. The UserContainer object itself is stored in the session, and it must have the duration of the session. If the user exits and re-enters the site, a new UserContainer typically is created for that user. The ApplicationContainer is used for a similar purpose, but at the application level, not the session level. It’s useful for storing or caching information that is needed by all users across the application. Things such as selection lists, configuration properties, and other non-client-specific data that you need to get once and hold on to are candidates for the ApplicationContainer class. This class is created when the application is first started and destroyed when the application exits. 9.6 Downsides to Extending the Framework There are a few downsides to customizing or extending a framework. Although I’ve suggested that customization is a forecasted goal of using a framework, as with other things in software development, there are trade-offs. When extending a framework, one of the biggest issues that you may face is what to do when newer versions of the framework are made available. Unless the framework developers paid careful attention to backward compatibility, your application may no longer work correctly with a newer version of the
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