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Faces events published during the request processing lifecycle
9:
The JSF Event Model
Events published during application startup PostConstructApplicationEvent
PARTIII PART PART
Events published during application shutdown PreDestroyApplicationEvent Events published at any time during the application lifetime ExecptionQueuedEvent PostConstructCustomScopeEvent PreDestroyCustomScopeEvent PostConstructViewMapEvent PreDestroyViewMapEvent PostAddToViewEvent PreRemoveFromViewEvent
FIGURE 9-5
Faces events published at other times during the application lifetime
Table 9-1 summarizes the different types of events and when they are processed in the request processing lifecycle
Event Category Application Events
TABLE 9-1
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
ValueChangeEvent
The Standard Event Types in JSF (continued)
Part I:
The JavaServer Faces Framework
Event Category Lifecycle Events
TABLE 9-1
Event Type PhaseEvent
When It Is Processed Before or after each lifecycle phase Can write PhaseListener to listen and execute for specific lifecycle phase events During the Restore View Phase, after every component has had its state restored During Restore View Phase, after a component has been added to a view During Apply Request Values Phase, as each component that has Ajax behavior has its decode( ) method called During Process Validations Phase, after each component has been validated During Process Validations Phase, before each component has been validated During Render Response Phase, before each component is rendered During Render Response Phase, before the entire view is rendered Before the first request has started through the request processing lifecycle After the application has been directed to shut down by the container During any phase, when an exception is queued for the ExceptionHandler During any phase, when a custom scope has been created Custom scopes are discussed in 13 During any phase, when a custom scope is about to be destroyed During any phase, at the first point in time when the view scope is accessed For example, via the evaluation of an EL expression that starts with viewScope, such as #{viewScopeuser} After the end of the Render Response phase During any phase when a component is programmatically removed from the view This happens when remove( ) is called on the List<UIComponent> returned from UIComponentgetChildren( )
PostRestoreStateEvent PostAddToViewEvent AjaxBehaviorEvent
PostValidateEvent PreValidateEvent PreRenderComponentEvent PreRenderViewEvent PostConstructApplicationEvent PreDestroyApplicationEvent ExeceptionQueuedEvent PostConstructCustomScopeEvent
PreDestroyCustomScopeEvent PostConstructViewMapEvent
PreDestroyViewMapEvent PreRemoveFromViewEvent
The Standard Event Types in JSF (continued)
9:
The JSF Event Model
TIP 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 <f:view> tag also has attributes beforePhaseListener and afterPhaseListener, which accept method expression arguments with signatures javaxfaceseventPhaseListenerbeforePhase( ) and javaxfaces eventPhaseListenerafterPhase( ), respectively
PARTIII PART PART
Application Events
The following two sections examine the most important category of events in JSF, application events These are important because they are the most convenient way to react to the user s manipulation of the UI components in the application
The Anatomy of an Action Event
Consider the simple case of a Faces button (<h:commandButton/> or UICommand) being clicked on a page As with any Web application, when the Faces button is clicked, the form is submitted and an HTTP Post is sent to the application server where the JSF application is running As the JSF request processing lifecycle processes the request, it is in the Apply Request Values phase that the event generated by the button click is queued as an action event If the HTTP request contains a component ID that matches the ID of the UICommand button that was clicked, then the Faces lifecycle knows that the button was clicked At this point, the only thing that can be done is to record that the button click occurred, since other UI components may still be receiving their updates from other incoming request values To record the button click event, the Faces lifecycle instantiates an ActionEvent object and passes it as an argument to the UICommand s queueEvent( ) method The event has now been queued for future processing The Apply Request Values phase will complete and proceed to the other phases, Process Validations and Update Model Values It isn t until the Invoke Application phase is reached successfully (providing no validation, conversion, or model update errors are encountered) that a corresponding ActionListener will process the ActionEvent
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