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As with any JSF component, there are the usual parts: JSP tag, the UIComponent subclass, and the Renderer For simplicity, we have absorbed the Renderer into the UIComponent subclass, though a production implementation would surely want to break it out, considering the rendering-intensive nature of this component In addition to the usual three parts, there is an additional RememberMePhaseListener This is necessary because the action of the component depends on the validity of the login Only if the login is successful do we want to set the cookie This is a perfect application for a component-specific PhaseListener, registered for the Render Response phase of the lifecycle, and taking action on the beforePhase event therein The following is an outline of the RememberMeLoginComponent s operation An explanation of each part of the outline, with code examples, is presented in the following sections RememberMeLoginComponent Lifecycle and State Management Rendering Behavior Properties RememberMeLoginTag RememberMePhaseListener Interaction with the Virtual Trainer Login Scheme Interaction with the Servlet API
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RememberMeLoginComponent: Lifecycle and State Management
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This component is a composite component, as shown in the UML diagram in Figure 15-5 In noncomposite JSF components, the view description technology, such as JSP, is responsible for instantiating the UIComponents and adding them into the view With a
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FIGURE 15-5 The class diagram of the RememberMeLoginComponent
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composite component, that responsibility now belongs to the component itself This presents a subtlety involving state management As shown in 11, the user can choose to have the application save its state in the client or on the server in an implementation-dependent manner Some implementations of the state management API cause new instances of the components in the view to be created on each run through the lifecycle; therefore, care must be taken to avoid adding the child components on restore The following is the class declaration, constructor, initialization, and StateHolder methods from RememberMeLoginComponent:
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package comjsfcompreftrainercomponentscomponent; import import import import import import import import import import import import import import import import comjsfcompreftrainercomponentsutilUtil; javaioIOException; javautilList; javautilMap; javaxfacescomponentUICommand; javaxfacescomponentUIComponent; javaxfacescomponentUISelectBoolean; javaxfacescomponentUIInput; javaxfacescomponentUIViewRoot; javaxfacescomponenthtmlHtmlCommandButton; javaxfacescomponenthtmlHtmlSelectBooleanCheckbox; javaxfacescontextFacesContext; javaxfacescontextResponseWriter; javaxfaceselValueBinding; javaxservlethttpCookie; javaxservlethttpHttpServletRequest;
public class RememberMeLoginComponent extends FormBasedLoginComponent { public RememberMeLoginComponent() { buildLoginComponents(); } private void buildLoginComponents() { // reset button HtmlCommandButton reset = new HtmlCommandButton(); resetsetImmediate(true); resetgetAttributes()put("type", "reset"); resetsetValue(getResetButtonLabel()); setResetButtonComponent(reset); // login button setLoginButtonComponent(new HtmlCommandButton()); getLoginButtonComponent()setValue(getButtonLabel()); // checkbox setRememberMeCheckboxComponent(new HtmlSelectBooleanCheckbox()); } public Object saveState(FacesContext context) { Object [] state = new Object[6]; state[0] = supersaveState(context); state[1] = saveAttachedState(context, getUsernameComponent()); state[2] = saveAttachedState(context, getPasswordComponent()); state[3] = saveAttachedState(context, getLoginButtonComponent()); state[4] = saveAttachedState(context, getResetButtonComponent()); state[5] = saveAttachedState(context, getRememberMeCheckboxComponent()); return null; } public void restoreState(FacesContext context, Object state) { Object [] stateArray = (Object []) state; superrestoreState(context, stateArray[0]); setUsernameComponent((UIInput) restoreAttachedState(context, stateArray[1]));
PART III
Part III:
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setPasswordComponent((UIInput) restoreAttachedState(context, stateArray[2])); setLoginButtonComponent((UICommand) restoreAttachedState(context, stateArray[3])); setResetButtonComponent((UICommand) restoreAttachedState(context, stateArray[4])); setRememberMeCheckboxComponent((UISelectBoolean) restoreAttachedState(context, stateArray[1])); } private void initializeComponent(UIComponent oldC, UIComponent newC) { List children = getChildren(); UIViewRoot root = FacesContextgetCurrentInstance() getViewRoot(); if (null != oldC) { childrenremove(oldC); } newCsetId(rootcreateUniqueId()); childrenadd(newC); } private javaxfacescomponentUIInput usernameComponent; public javaxfacescomponentUIInput getUsernameComponent() { return thisusernameComponent; } public void setUsernameComponent(javaxfacescomponentUIInput usernameComponent) { initializeComponent(getUsernameComponent(), usernameComponent); usernameComponentsetId("userid"); thisusernameComponent = usernameComponent; } // Similar getters and setters exist for the passwordComponent, // loginButtonComponent, resetButtonComponent, and // rememberMeCheckboxComponent properties // Remainder of code below
Let s take a moment to examine the state management implications of this code, since this area often causes developers some pain Note that the constructor unconditionally calls buildLoginComponents( ) to create the buttons and the checkbox as children of itself As mentioned in 10, this practice is undesirable, but sometimes unavoidable, as is the case with this composite component Let s review why modifying the state of the component from its constructor is undesirable When JSF processes the postback from a browser, the first thing it does is restore the view to its previous state Depending on the state management implementation, this may cause the constructor of each component in the view to be called, followed by a call to the restoreState( ) method Therefore, if the component state is modified in any way in the constructor, the restoreState( ) method must take those modifications into account when applying the restored state Strict adherence to the OO principle of always using accessor methods instead of instance variables makes it possible to encapsulate this behavior in the initializeComponent( ) method, which is called from every component property setter, such as setUsernameComponent( ) or setLoginButtonComponent( ) Look at the initializeComponent( ) method and note that
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