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ActionListener
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The ActionListener is where the outcome of executing a user action, such as pressing a button, is derived Once the outcome is obtained, the ActionListener is responsible for calling the NavigationHandler, which executes the decision-making process based on that outcome Thus, the ActionListener works closely with the NavigationHandler, but it makes sense to allow them both to be independently replaced As shown in the preceding section, it is sometimes desirable to replace how the navigation decision is made, without changing how the outcome is derived that is passed into the navigation decision-making process Likewise, it can be convenient to replace just the outcome derivation process without replacing the navigation decision-making process 14 provides an example of how to replace the default ActionListener with one that consults the Java platform security model before performing the action This example only allows the action to complete if the user is properly authenticated and has the proper permissions to execute the action See the section Using JAAS Authentication in the Virtual Trainer in 14 for details and source code
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Extending JavaServer Faces
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Interface to Implement
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A custom ActionListener must implement the interface javaxfaceseventActionListener, which defines the following method:
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public void processAction(ActionEvent event) throws AbortProcessingException;
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The processAction( ) method receives the ActionEvent emitted from an ActionSource component (such as a button), invokes the method binding returned as the value of the action property of the ActionSource to arrive at the outcome value, and calls the NavigationHandler with the resultant outcome
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Registering an ActionListener
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A custom ActionListener may be registered declaratively using the action-listener element in the faces-configxml file, or dynamically using the setActionListener( ) method on Application The former is recommended and must contain the fully qualified Java class name of a class implementing ActionListener The action-listener element is a child of the application element in the faces-configxml See 15 for the faces-configxml syntax for registering an ActionListener
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StateManager
A Web Application Framework must provide a solution for managing view state across HTTP requests as the user moves through the application A good Framework will allow the design and implementation of this solution to be customizable, and Faces does just that with the StateManager API View state management is a complex business, and few application developers will have to worry about customizing it In fact, most use cases for customizing state management arise for JSF implementers or those taking an existing JSF implementation and customizing it to their needs For example, one use case for a custom StateManager would be replacing the default implementation with a high-performance one that relies on a database and supports object pooling Therefore, only a brief overview of the StateManager API is provided
Abstract Class to Extend in JSF 11 and 10
A custom StateManager must extend the abstract class javaxfacesapplicationStateManager and decorate or replace the following methods:
public SerializedView saveSerializedView(FacesContext context); protected Object getTreeStructureToSave(FacesContext context); protected Object getComponentStateToSave(FacesContext context); public void writeState(FacesContext context, SerializedView state) throws IOException; public UIViewRoot restoreView(FacesContext context, String viewId, String renderKitId); protected UIViewRoot restoreTreeStructure(FacesContext context, String viewId, String renderKitId);
13:
Building Non-UI Custom Components
protected void restoreComponentState(FacesContext context, UIViewRoot viewRoot, String renderKitId); public boolean isSavingStateInClient(FacesContext context);
A default implementation of isSavingStateInClient( ) is provided that consults the JSF specification defined javaxfacesSTATE_SAVING_METHOD servlet context init parameter to determine if the state is to be saved in the page (the default) or on the server The intent of the previous methods is explained by examining the state saving and state restoring process in the context of the request processing lifecycle
PART II
JSF 12 TIP A bug in the JSF 11 specification is that the SerializedView class itself is not
Serializable! When saving the state on the server, this poses problems with containers that need to do session failover within a cluster This problem was fixed in JSF 12 with a redesign of the StateManager API, which included deprecating all of the JSF 11 methods of this class
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