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A p p l y i n g J S F : I n t r o d u c i n g t h e V i r t u a l Tr a i n e r A p p l i c a t i o n
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/user/myEventsxhtml Linked from the navigation menu, this page shows the events for which the current user is training and allows the user to take further action on any such event /user/editTrainingEventxhtml Reached when a user selects an event on the myEventsxhtml page, this page allows users to view the event details, including their training schedule for the selected event Users can delete multiple training sessions with one form submission There is a link to the addTrainingSessionxhtml page /user/addTrainingSessionxhtml Reached only from the editTrainingEventxhtml page, this page lets you add an individual training session to the training plan for a particular event /user/editUserxhtml Reached only from the My Profile link in the navigation menu, this page allows users to update their profile information, including selecting their online trainer from the list of available trainers
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PART II
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Pages in the /trainer Directory
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Pages in this directory are only shown to users who are trainers /trainer/addTrainingEventxhtml Linked from the navigation menu, this page allows a trainer to add a new event so that users may start training for it /trainer/editTrainingEventxhtml Linked from the navigation menu, this page allows a trainer to update the details of an existing event /trainer/viewTraineesxhtml Linked from the navigation menu, this page allows the trainer to see the list of users that have selected them as their trainer, and to click on each such user to perform additional actions /trainer/viewTrainingSessionsForUserxhtml Linked from the viewTraineesxhtml page, this page allows trainers to provide advice to the users as they progress through their training plans
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Pages in the /resources Directory
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Files in this directory are treated specially by the JSF runtime This special treatment will be discussed during the detailed explanation of JSF 2 Composite Components, a powerful new feature in JSF 20 This feature is described in 11 For now, just know that files and directories within the /resources directory are intended to be included in other pages in the application Content here can be images, stylesheets, and composite components /resources/style/logojpg A simple logo included in the templatexhtml page /resources/style/vtcss A CSS stylesheet, used in the templatexhtml page /resources/trainer/loginPanelxhtml A JSF 2 composite component that is a selfcontained login panel Users of this component must supply a POJO model object with specific properties and methods to fill out the behavior of the login panel
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Part II:
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This version of the Virtual Trainer entirely uses implicit navigation and therefore has no explicit navigation rules in the faces-configxml file In fact, the only reason this application needs a faces-configxml file at all is to declare the custom ExceptionHandler that is used to gracefully handle session timeouts
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Backing Beans
The term backing bean describes a request-scoped JSF managed bean that is conceptually bound to a specific JSF page Even though a backing bean is declared as a JSF managed bean, it is not considered a true model object because it has intimate knowledge of the view
E XPERT GROUP I NSIGHT Even though it would be useful to formalize the concept of backing
bean by including an abstract class containing all the common functionality for such beans, it was decided not to put the concept into the specification
The following utility class is the base class for all the backing beans in the Virtual Trainer application If the JSF Expert Group were to include a backing bean base class in the specification, it would probably look something like this Because this class is the abstract base class for all backing beans in Virtual Trainer, we will examine it in detail now, even though detailed descriptions for the concrete subclasses will appear later in the chapter in the context of the Facelet pages they back
package comjsfcompreftrainerbacking; import import import import import import comjsfcompreftrainerentityUser; javautilMap; javaxfacesbeanManagedProperty; javaxfacesbeanRequestScoped; javaxfacescontextFacesContext; javaxfacescontextFlash;
@RequestScoped public abstract class AbstractBacking { @ManagedProperty(value="#{facesContext}") private FacesContext facesContext; @ManagedProperty(value="#{requestScope}") private Map<String, Object> requestMap; @ManagedProperty(value="#{sessionScope}") private Map<String, Object> sessionMap; public User getCurrentUser() { return (User) getSessionMap()get("currentUser"); } public void setCurrentUser(User currentUser) { getSessionMap()remove("currentUser"); if (null != currentUser) {
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