qr code programmieren java The JavaServer Faces Framework in Java

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The JavaServer Faces Framework
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} else if (event instanceof PreDestroyApplicationEvent) { Map<String, Map<String, Object>> zips = (Map<String, Map<String, Object>>) appMapremove("zips"); zipsclear(); } } public Map<String, Map<String, Object>> createZipDatabase() { Map<String, Map<String, Object>> result = new HashMap<String, Map<String, Object>>(1); Map<String, Object> innerMap = new HashMap<String, Object>(2); innerMapput("city", "Dallas"); innerMapput("state", "Texas"); String dallasZips[] = { "75201", "75202", }; for (String zip : dallasZips) { resultput(zip, innerMap); } return result; } }
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The first two methods shown here are required for SystemEventListener implementations The isListenerForSource( ) method is called by the runtime to ask the listener, here is the source of the event, are you interested in it This is an opportunity to differentiate among different kinds of event source classes The processEvent( ) method is called when the event actually fires In this case, we interrogate the type of the event argument and take the appropriate action The specifications for the PostConstructApplicationEvent and PreDestroyApplicationEvent guarantee that this processEvent( ) will be called exactly twice, once at startup and once at shutdown Therefore, it is safe to use the higher-performance HashMap class rather than the concurrency-safe ConcurrentHashMap because we know that the application will only be doing reads from the map Finally, we need to modify the zipAutoFill bean s performLookup( ) method to use this new database
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private void performLookup(String zip, StringBuilder city, StringBuilder state) { Map<String, Object> appMap = FacesContextgetCurrentInstance()getExternalContext() getApplicationMap(); Map<String, Map<String, Object>> zips = (Map<String, Map<String, Object>>) appMapget("zips"); Map<String, Object> dataForZip = zipsget(zip); if (null != dataForZip) { cityappend((String) dataForZipget("city")); stateappend((String) dataForZipget("state")); } else { cityappend("Unknown City"); stateappend("Unknown State, maybe Texas "); } }
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The system event facility was inspired by utilities such as Solaris dtrace, and GNU/Linux truss These command-line UNIX utilities enable one to observe the operation of a program as it runs For example, it is possible to trace all system calls that open files from the file system The implementation of the system in Faces was designed to be very fast, so that calls to publish events, which will likely happen very frequently, do not bog down the running of the lifecycle System events are published by calling the publishEvent( ) method on the javax facesapplicationApplication instance This is a singleton class that can easily be accessed from anywhere using the FacesContextgetCurrentInstance( )getApplication( ) method There are two forms of publishEvent( ) The first form is shown here:
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public void publishEvent(FacesContext context, Class< Extends SystemEvent> systemEventClass, Object source);
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The second argument is the class for a Java class that extends the SystemEvent base class Any such classes must have a public zero-argument constructor The third argument is the source of the event When the event is published, whatever you pass here is set as the source member of the SystemEvent instance, and passed to the listener The second form of publishEvent( ) is shown next:
public void publishEvent(FacesContext context, Class< Extends SystemEvent> systemEventClass, Class< > sourceBaseType, Object source);
This second form has an additional argument, sourceBaseType For performance reasons, the specification for the publishEvent( ) method specifically excludes implementations from walking up the inheritance hierarchy of the source object However, it is sometimes necessary to manually tell the system the base type of the source argument This variant covers such cases
How to Subscribe to SystemEvents
The other side of the SystemEvent equation is, naturally, how to subscribe to these events Like many things in JSF, there is a Java API, a markup API, and an XML API that allow subscribing to events The latter two APIs are built on top of the former Let s examine the Java API first There are two classes that have subscribeToEvent( ) methods: Application, and UIComponent Use the Application version when you want to listen for direct SystemEvent subclasses Use the UIComponent version when you want to listen for ComponentSystemEvent subclasses The general form for ApplicationsubscribeToEvent( ) looks like this:
public void subscribeToEvent(Class< extends SystemEvent> systemEventClass, SystemEventListener yourListener);
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