Some Examples of Testing Output from Each of the Methods in .NET

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LISTING 18.14
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Some Examples of Testing Output from Each of the Methods
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LogReader.debug( Testing debug... ); LogReader.info( Testing info... ); LogReader.warn( Testing warn... ); LogReader.error( Testing error... ); LogReader.fatal( Testing fatal... );
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Launch the LogReader application and then publish your test file. You should see the output show up in the LogReader with each message displaying as a different color as specified in the console.css file. If everything worked correctly, then you are in good shape. Try out the hot-keys for filtering to see those in action as well. For example, pressing I should clear the display except for info messages. Pressing A should bring all of the messages back. Using the LogReader class as is may be plenty sufficient for you, but you may also wish to integrate it with a logger such as the one included in the Flex framework. By doing so, you can also output your messages in a specially formatted manner and to multiple targets, such as trace output to the Eclipse console.
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Sample Application: LogReader
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In order to integrate the log reader API with the Flex logger, you need to create a new target. In Listing 18.15, a new target class is defined for outputting all logger messages to the LogReader application. The class that it subclasses, LoggerTarget, is derived from TraceTarget and simply formats the message before passing it and the log level to the internalLog method. By overriding this method, you can now send the message to the LogReader application rather than using the trace statement to output the message.
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LISTING 18.15
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Creating a Custom Logger Target for Integration with the Flex Logging Package
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package org.airbible.logging { import mx.logging.LogEvent; import org.airbible.logReader.FilterLevel; import org.airbible.logReader.LogReader; public class LogReaderTarget extends LoggerTarget { public function LogReaderTarget() { LogReader.clear(); } override protected function internalLog(message:String, level:int):void { var logEventLevel:String = LogEvent.getLevelString(level). toLowerCase(); switch(logEventLevel) { case FilterLevel.DEBUG: { LogReader.debug(message); break; } case FilterLevel.INFO: { LogReader.info(message); break; }
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continued
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Part IV
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Building an Application
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LISTING 18.15
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case FilterLevel.WARN: { LogReader.warn(message); break; } case FilterLevel.ERROR: { LogReader.error(message); break; } case FilterLevel.FATAL: { LogReader.fatal(message); break; } } } } }
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You can now create this target along with other targets and pass them to the logger while initializing your application, as shown in Listing 18.16.
LISTING 18.16
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An Example of Using the Custom Logger Target
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protected function initLogger():void { var traceTarget :TraceTarget var logReaderTarget :LogReaderTarget LogReaderTarget(); traceTarget.level traceTarget.includeCategory traceTarget.includeDate traceTarget.includeLevel traceTarget.includeTime logReaderTarget.level logReaderTarget.includeCategory
= new TraceTarget(); = new
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= LogEventLevel.ALL; = true; = true; = true; = true; = LogEventLevel.ALL; = true;
Sample Application: LogReader
logReaderTarget.includeDate logReaderTarget.includeLevel logReaderTarget.includeTime Log.addTarget(traceTarget); Log.addTarget(logReaderTarget); }
= true; = true; = true;
By leveraging the Flex logger s capability to output to multiple targets, you can now enjoy the same messages in both the Eclipse console and the LogReader application. This is ideal as developers are free to use the console of their choice to monitor log output while using a single API for logging as shown here:
Logger.debug(getQualifiedClassName(this), build , Method called. );
CROSS-REF
The use of a Logger class to funnel Flex logger output is discussed in more detail in 6.
That is it. You have finished creating your very own log reader application.
Summary
This chapter walks you through creating a very useful AIR application in a short amount of time. Traditionally, this type of application was created and deployed as a SWF file to be ran in a standalone version of Flash Player while debugging a project. That brings us to the reader challenge. Since this is an AIR application and not a SWF file like the traditional versions of this application were back in the day, you now have access to the file system. Our challenge is this using what you have learned in previous chapters, load the Flash Player log file and display its contents in the console rather than needing to depend on a special LogTarget. This way all trace output will be visible, not just special output. Good luck!
Polishing a Finished Application
hen you reach the end of a long project, the same thing almost always happens: Things get hectic. If people are finding a lot of bugs, then you will be in a rush to fix them. If people aren t finding any bugs, then they will probably send lists of features they would like to see added. After all, no application is ever complete. There are always things it could do a little bit faster, something more that it could do, or some way that it could be improved visually. When you get to this part of a project, you should be focused on the polish of the application. Polish can be split into two general categories: design and usability. The design of an application is, of course, how it looks and includes: Typography Colors Layout Usability describes how it works for the user and includes: Readability Reliability Versatility As the programmer, it is easy to forget just how important these things are to an application, especially when there is a deadline approaching. Some last-minute design demands might be the improvement of animations, additional button states, changes to improve typography, or changes to the way things line up. Usability demands will most likely include performance improvements, bug fixes, keyboard shortcut options, language support, or accessibility.