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3. Because you selected to have several different implementations of the provider type, the next dialog box requests the name of the default instance. Set the default instance name to defaultMath for this example. Then click Finish. If you make a mistake while running a recipe, you can always run it again. Just look in the History tab of the Guidance Navigator. Figure 14-9 shows an example of the History tab after running the New Provider Factory and Base Recipe.

// implementation of MIDlet // these methods may be called by the application management // software at any time, so you always check fields for null // before calling methods on them. /** * Start the application. */ public void startApp() throws MIDletStateChangeException { try { if(myCanvas == null) { myCanvas = new JumpCanvas(this); myCanvas.addCommand(myExitCommand); myCanvas.addCommand(myPauseCommand); myCanvas.setCommandListener(this); } if(myGameThread == null) { myGameThread = new GameThread(myCanvas); myCanvas.start(); myGameThread.start(); } else { myCanvas.removeCommand(myGoCommand); myCanvas.addCommand(myPauseCommand); myCanvas.flushKeys(); myGameThread.resumeGame(); } } catch(Exception e) { errorMsg(e); } } /** * stop and throw out the garbage. */ public void destroyApp(boolean unconditional) throws MIDletStateChangeException { if(myGameThread != null) { myGameThread.requestStop(); } myGameThread = null; myCanvas = null; System.gc(); } /** * request the thread to pause. */

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Figure 14-9. History tab after creating a provider factory After running the New Provider Factory and Base recipe, a series of files will be created to support the instantiation and wiring up of a new instance of the provider. These include the provider factories, provider interface, and provider base class, as shown in Figure 14-10. Now you need to work with two files: I<Provider Name>.cs will contain an interface to which all the providers will adhere. This file is named ISampleProvider.cs in the example. <Provider Name>.cs provides a base class implementation for the interface. This file is called SampleProvider.cs in the example. You can see these files toward the bottom of the Solution Explorer window in Figure 14-10.

CHAPTER 8 JOHNNXT IS ALIVE!

The formatted event log trace listener writes entries to the Application event log. This is the most common destination for logging by application development teams. The value entered for the source attribute determines the event source within the log to which the entry will be written. This value will show up in the Source column when the entries are viewed in the Event Viewer or the Events section of the Computer Management program. You can create a new event source, as described shortly. A central server can be designated via the machineName attribute, rather than putting a log on each of the servers that runs an application. This has its own risks, since this creates a single point of failure. Listing 9-9 shows an example of a formatted event log trace listener configuration in the app.config file. Listing 9-9. Formatted Event Log Trace Listener Configuration <listeners> <add source="LoggingDemo" formatter="Text Formatter" log="DemoLogs" machineName="" listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.

public void pauseApp() { if(myCanvas != null) { setGoCommand(); } if(myGameThread != null) { myGameThread.pauseGame(); } } //---------------------------------------------------------------// implementation of CommandListener /* * Respond to a command issued on the Canvas. * (either reset or exit). */ public void commandAction(Command c, Displayable s) { if(c == myGoCommand) { myCanvas.removeCommand(myGoCommand); myCanvas.addCommand(myPauseCommand); myCanvas.flushKeys(); myGameThread.resumeGame(); } else if(c == myPauseCommand) { myCanvas.removeCommand(myPauseCommand); myCanvas.addCommand(myGoCommand); myGameThread.pauseGame(); } else if(c == myNewCommand) { myCanvas.removeCommand(myNewCommand); myCanvas.addCommand(myPauseCommand); myCanvas.reset(); myGameThread.resumeGame(); } else if((c == myExitCommand) || (c == Alert.DISMISS_COMMAND)) { try { destroyApp(false); notifyDestroyed(); } catch (MIDletStateChangeException ex) { } } } //------------------------------------------------------// error methods /** * Converts an exception to a message and displays * the message. */

CHAPTER 8 JOHNNXT IS ALIVE!

Configuration.FormattedEventLogTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null" traceOutputOptions="Callstack" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners. FormattedEventLogTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null" name="Formatted EventLog TraceListener" /> </listeners> Figure 9-5 shows the result in the Event Viewer of using the configuration in Listing 9-9 to log messages.

void errorMsg(Exception e) { if(e.getMessage() == null) { errorMsg(e.getClass().getName()); } else { errorMsg(e.getClass().getName() + ":" + e.getMessage()); } } /** * Displays an error message alert if something goes wrong. */ void errorMsg(String msg) { Alert errorAlert = new Alert("error", msg, null, AlertType.ERROR); errorAlert.setCommandListener(this); errorAlert.setTimeout(Alert.FOREVER); Display.getDisplay(this).setCurrent(errorAlert); } }

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