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The JavaServer Faces Request Processing Lifecycle
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Here are the lifecycle phases: Restore View Restores or creates a server-side component tree (View) in memory to represent the UI information from a client Apply Request Values the client Update Model Values Updates the server-side components with fresh data from
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PARTIII PART PART
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Process Validations Performs validation and data type conversion on the new data Updates any server-side Model objects with new data Invoke Application Invokes any application logic needed to fulfill the request and navigate to a new page if needed Render Response Saves state and renders a response to the requesting client Figure 3-2 shows a high-level view of how these phases work together to form the request processing lifecycle As you can see, it performs all the tasks for processing incoming data in a Web application We ll be referring to the different events and phases in this figure throughout the rest of this chapter, and throughout the book Now, let s drill down and examine exactly what happens during the processing of each lifecycle phase
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Restore View
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As previously mentioned, the Faces View is a server-side tree of UI components that provides a mirror representation of the user interface presented in a client (see Figure 3-3) It is the job of the Restore View phase to either restore an existing View from a previous transaction or create a fresh View based on a new request If the request is a new one ( nonpostback ), a new View is created and will be stored in a parent container object known as the FacesContext The FacesContext serves as storage for all of the data pertinent to the current request s run through the request processing lifecycle
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Restore view
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Apply request values
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Process validations
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Invoke application
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FIGURE 3-2
The JavaServer Faces request processing lifecycle
Part I:
The JavaServer Faces Framework
FIGURE 3-3 The server-side UI component tree, also known as the View
HtmlInputText HtmlMessage HtmlInputText HtmlMessage
UIViewRoot HtmlOutputBody HtmlForm HtmlSelectOneMenu UISelectItem UISelectItem UISelectItem HtmlMessage HtmlCommandButton HtmlOutputHead
HtmlSelectOneRadio UISelectItem UISelectItem HtmlMessage HtmlInputText HtmlMessage
Web developers needn t worry about application data in the FacesContext being accidentally mixed from multiple user requests because the servlet API guarantees that operations on a request are thread-safe that is, all operations on the FacesContext are guaranteed to occur on a single thread, per user request
JSF 20 TIP Page Parameters, a popular feature from the JBoss Seam Framework, have been
introduced to JSF under the name of View Parameters This feature will be fully covered in 6 However, it must be mentioned here that View Parameters are full JSF UIComponents and thus are a part of the normal request processing lifecycle View Parameters allow JSF to handle incoming request parameters even on a nonpostback request
Apply Request Values
After the View has been restored, the next phase, known as the Apply Request Values phase, performs the job of processing the incoming request values or name-value pairs of information Each UI component node in the View hierarchy is now able to take on the updated values sent by the client as shown in Figure 3-4 Behind the scenes, the JSF runtime applies request values to UI components by calling a high-level method (processDecodes( )) on the View (or UIViewRoot) of the UI component tree This causes all of the child components to call their processDecodes( ) methods recursively As you will see in 11, the processDecodes( ) method, or more specifically the decode( ) method of UI components, is the method that allows the component to decode the incoming request name-value pairs and apply a matching new incoming value to the value attribute of the UI component
3:
The JavaServer Faces Request Processing Lifecycle
PARTIII PART PART
UIViewRoot HtmlOutputBody HtmlForm HtmlInputText HtmlMessage HtmlInputText HtmlMessage HtmlSelectOneRadio UISelectItem UISelectItem HtmlMessage HtmlInputText HtmlMessage HtmlInputText HtmlMessage HtmlSelectOneMenu UISelectItem UISelectItem UISelectItem HtmlMessage HtmlCommandButton HtmlOutputHead
FIGURE 3-4
Applying the request values
It should be pointed out that only UI components that are capable of holding a value (such as an input field) can have new values applied to them In general, there are two types of components: those that have values, such as text fields, check boxes, and labels; and those that cause actions, such as buttons and links All components that have a value attribute implement the ValueHolder interface All form element type components that have values that are editable by the user implement the EditableValueHolder interface All components that cause actions (buttons or links) implement the ActionSource interface
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