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User-Agent: Mozilla/40 (compatible; MSIE 60; Windows NT 51; SV1; NET CLR 2050215) Host: 1921681100:8081 Connection: Keep-Alive Response 2: HTTP/11 304 Not Modified Date: Wed, 10 Aug 2005 10:11:58 GMT Server: Apache-Coyote/11 When the client makes the second request, the additional identifiers If-Modified-Since and If-None-Match are sent in the request Notice how the identifier If-None-Match references the identifier of the previously sent ETag value The server queries the URL and generates an entity tag If the entity tag is identical to the value being sent, the server returns an HTTP 304 code to indicate that the content has not changed When using entity tags, the client can send an If-Match or an If-None-Match If the client sends an If-Match, and the data on the server is out-of-date, the server returns a cache miss error, and not the new data.

Figure 6-9.

calls if the user presses a key while the application is running. The HelloCanvas class repaints the screen with or without the Hello World! message when the toggleHello() method is called. Listing 1-2 shows the code for Hello.java. Listing 1-2. Hello.java package net.frog_parrot.hello; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; /** * This is the main class of the "Hello, World" demo. * * @author Carol Hamer */ public class Hello extends MIDlet implements CommandListener { /** * The canvas is the region of the screen that has been allotted * to the game. */ HelloCanvas myCanvas; /** * The Command objects appear as buttons in this example. */ private Command exitCommand = new Command("Exit", Command.EXIT, 99); /** * The Command objects appear as buttons in this example. */ private Command toggleCommand = new Command("Toggle Msg", Command.SCREEN, 1); /** * Initialize the canvas and the commands. */ public Hello() { myCanvas = new HelloCanvas(); myCanvas.addCommand(exitCommand); myCanvas.addCommand(toggleCommand); // you set one command listener to listen to all // of the commands on the canvas: myCanvas.setCommandListener(this); } //----------------------------------------------------------------

Figure 6-10.

Edit Parts (see Figure 6-11).

If the client sends an If-None-Match identifier when the server data is unchanged, the server sends an HTTP 304 return code If the data is out-of-date, new data is sent The advantage of using the HTTP Validation model of caching is that you are always guaranteed to get the latest version at the time of the request The clients can make the request E B V N every couple of seconds, hours, weeks, or whatever period they choose It is up to the client to decide when to get a fresh copy of the data Granted, there is still some HTTP traffic due to the requests, but it has been reduced to a minimum Having said all that, there are situations when using the HTTP Expiration model does make sense for example, when the HTML content is static and changes rarely.

Figure 6-12) and set the Thumb and Track, which are required, by selecting the graphics that make these components. Then click the check box.

/** * Start the application. */ public void startApp() throws MIDletStateChangeException { // display my canvas on the screen: Display.getDisplay(this).setCurrent(myCanvas); myCanvas.repaint(); } /** * If the MIDlet was using resources, it should release * them in this method. */ public void destroyApp(boolean unconditional) throws MIDletStateChangeException { } /** * This method is called to notify the MIDlet to enter a paused * state. The MIDlet should use this opportunity to release * shared resources. */ public void pauseApp() { } //---------------------------------------------------------------// implementation of CommandListener /* * Respond to a command issued on the Canvas. * (either reset or exit). */ public void commandAction(Command c, Displayable s) { if(c == toggleCommand) { myCanvas.toggleHello(); } else if(c == exitCommand) { try { destroyApp(false); notifyDestroyed(); } catch (MIDletStateChangeException ex) { } } } }

The project was saved as FXP, which Flash Builder 4 recognizes, allowing it to import FXP projects. Open Flash Builder 4 and select File Import Flex Project (FXP) Browse and select DarkNight.fxp, and then select Finish.

For the scope of this book and this pattern, it does not make sense to use the HTTP Expiration model because Ajax applications are inherently using data that does change Implementing HTTP validation is simple because the most popular web browsers and HTTP servers already implement it In this chapter, I will discuss the details of implementing HTTP validation because there are some things the web browser and HTTP server do not do However, building a more sophisticated infrastructure that supposedly enhances HTTP validation is not recommended because that would be defeating the facilities of HTTP 11 Using the HTTP 11 infrastructure means that the server you are communicating with must have implemented the HTTP 11 protocol properly If you are using Microsoft Internet Information Server, Apache Tomcat, or Jetty, you will have no problems.