An ENTER_FRAME Event Handler for Monitoring the Frame Rate in .NET

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LISTING 6.4
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An ENTER_FRAME Event Handler for Monitoring the Frame Rate
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protected function enterFrameHandler(event:Event):void { if(getTimer() - _timeStamp > 1000) { fpsLabel.text = FPS: + String(_frames); _frames _timeStamp } else { _frames++; } } = 1; = getTimer();
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Part II
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Programming for AIR Essentials
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The getTimer method always returns how many milliseconds the application has been running. By capturing the current time in a property and then checking it again each time a frame is rendered, you can count how many frames are rendered in one second. This is referred to as frames per second, or FPS for short. Frames per second is the standard measurement of frame rate. If this is something that you may end up using frequently, you may benefit from making your own nifty little FPS component that you can simply add to the display in any project.
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Monitoring the total memory
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Perhaps even more important than the frame rate is the amount of memory your application uses. A problem that is more common in applications than it should be is memory leak. A memory leak is when the amount of memory your application is using continues to increase over time until it uses up all the computer s memory. In a best-case scenario, only your application will crash, but in a worst-case scenario, it could force a user to restart his machine. As shown here, monitoring memory consumption is very easy to do:
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protected function enterFrameHandler(event:Event):void { memoryLabel.text = Memory: + System.totalMemory; }
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Because memory output is measured in bytes, you may wish to convert the number to megabytes so that it is easier to read. Listing 6.5 shows how you can convert the bytes to megabytes and then round the number off to a specified number of decimal points.
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LISTING 6.5
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An ENTER_FRAME Event Handler for Monitoring Memory Usage
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protected function enterFrameHandler (event:Event):void { // BYTES = 1 / 1024 memoryLabel.text = Memory: + String(round(System.totalMemory * BYTES * BYTES, 2)) + MB ; } protected function round(value:Number, decimals:Number):Number { var divisor:Number = Math.pow(10, decimals); return Math.round(value * divisor) / divisor; }
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Debugging and Profiling
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Though you can now monitor memory consumption and detect a leak, you have little insight as to where the source of the leak is. That is where the Flex Builder profiler comes in handy; you can explore this great tool later on in this chapter.
Timing the code execution
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The simple trick that you are about to learn is one of the most useful techniques that you can possibly use to find slow-performing code and optimize it. Listing 6.6 demonstrates the use of the getTimer method for timing the number of milliseconds a line of code (or a block of code) takes to execute.
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LISTING 6.6
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The getTimer Method for Clocking Code
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var time:int = getTimer(); // INSERT OPERATION #1 CODE HERE trace( Operation #1 took + String(getTimer() - time) + milliseconds. ); time = getTimer(); // INSERT OPERATION #2 CODE HERE trace( Operation #2 took + String(getTimer() - time) + milliseconds. );
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Using this approach, you can locate slow code and experiment with possible solutions until you find one that performs acceptably.
Monitoring memory with the Flex Builder profiler
The Flex Builder profiler is your best friend. This is your best resource for monitoring your application s memory consumption. It shows you how many instances of each object currently exist and how much memory they take up. If your application has a memory leak, you will likely be able to locate the problem very quickly with this tool.
NOTE
The profiler tool is only included with Flex Builder Professional.
Part II
Programming for AIR Essentials
To get started using the Profiler tool, click the Profiler button in the top toolbar of Flex Builder (see Figure 6.2). It is located to the right of the Debug button. Upon clicking it, the perspective should change to the Flex Builder profiler perspective and a popup window should appear. The window contains a handful of options for configuring the profiler before running it. The default settings are typically sufficient.