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The Faces Event Listener Interfaces and Event Classes
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The JavaServer Faces event class hierarchy is displayed in Figure 8-1 To listen to the Faces events, a set of Java interfaces are provided by the Faces environment Faces event listeners must implement these interfaces, which are illustrated in Figure 8-2
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E XPERT GROUP I NSIGHT Note that PhaseEvent extends javautilEventObject directly while
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ValueChangeEvent and ActionEvent extend from FacesEvent The PhaseListener concept came after the core event model was defined and it was decided to keep the two kinds of events separate in the class hierarchy because the FacesEvent subclasses all have a UIComponent as their source, while a PhaseEvent has the Lifecycle as its source As we ll explain shortly, exactly when and how Faces events are fired and processed is managed entirely by the JSF request processing lifecycle and there are even ways to manipulate the order of when certain types of events are processed
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FIGURE 8-1 Faces event class hierarchy
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The JavaServer Faces Framework
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FIGURE 8-2 Faces event listener interface hierarchy
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When Are Faces Events Processed
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Figure 8-3 shows when and which types of events are processed throughout the request processing lifecycle The following table summarizes the different types of events and when they are processed in the request processing lifecycle
Event Type ActionEvent When It Is Processed At the completion of the Invoke Application phase unless the immediate flag is true; then it is processed at the end of the Apply Request Value phase At the completion of the Process Validations phase unless the immediate flag is true; then it is processed at the end of the Apply Request Value phase Before or after each lifecycle phase Can write PhaseListener to listen and execute for specific lifecycle phase events Superclass of ActionEvent and ValueChangeEvent Does not specifically execute in lifecycle
ValueChangeEvent
PhaseEvent Faces Event
JSF 12 TIP In JSF 12 it is possible to register PhaseListeners on the UIViewRoot of the view
PhaseEvents sent to listeners registered in this way still have the Lifecycle as their source and have the benefit of being scoped to a particular view, rather than for every view in the application Phase listeners can be registered on the UIViewRoot using the <f:phaseListener> tag or programmatically by calling the addPhaseListener( ) method or the setBeforePhaseListener( ) or setAfterPhaseListener( ) methods These latter two take a MethodExpression that points to a method whose signature matches that of the afterPhase( ) method of the PhaseListener interface The 12 <f:view> tag also has attributes beforePhaseListener and afterPhaseListener, which accept method expression arguments with signatures javaxfaceseventPhaseListener beforePhase() and javaxfaceseventPhaseListenerafterPhase(), respectively
8:
The JSF Event Model
PART I PART I PART I
FIGURE 8-3 The processing of events throughout the request processing lifecycle
E XPERT GROUP I NSIGHT The Expert Group spent a lot of time debating the difference between
application events and UI events Generally, an application event is one that changes the state of the application, usually by moving from one page to another, submitting an order, or similar A UI event was defined to be an event that doesn t change the state of the application, such as clicking on a tab in a tab panel, or expanding or contracting a node in a tree component While these distinctions are useful concepts, it was ultimately decided not to expose them in the API for simplicity s sake However, the heritage of these two types of events does live on in the form of the ActionListener interface, which can loosely be associated with the UI event concept, and the action mechanism, which can loosely be associated with the application event concept Both of these are described in this chapter Faces events actually consist of two phases: when the event is fired and when a listening agent acts upon the event Because the request processing lifecycle handles the firing of the event internally, a complete understanding of what happens behind the scenes is not technically required when building most Faces applications, but still valuable However, knowing how to write code to handle a Faces event is something every Faces developer must understand The following sections explain both the queuing and handling of Faces action and value change events
Part I:
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