birt code 128

birt code 128

birt code 128

birt code 128

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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an If-None-Match identifier when the server data is unchanged, the server sends an HTTP 304 return code If the data is out-of-date, new data is sent The advantage of using the HTTP Validation model of caching is that you are always guaranteed to get the latest version at the time of the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.

Hence, when I performed my testing manually, I tested it from the perspective of how I thought the application should run, not the way it was actually going to be used Over time, improvements have been made in the quality-control phase of the software development life cycle These improvements include the automation of testing, the division of testing responsibilities, and the overall best practices and guidelines in how to test software (stress testing, load testing, regression testing, and so on) In today s world, it is typical for the business users or quality-control teams who are business savvy to actually perform most of the quality-control testing to find application defects This leaves the developers free to focus on what they do best developing That is not to say the developer will not perform any testing.

The very last thing that the code in the previous section did was to display the tile on the stage using the drawGameObject method. drawGameObject(platform, _backgroundBitmapData); Let s take a close look at exactly how it does this. You ll recall from 6 that to blit objects, you need two things: A source BitmapData object. That s the tile sheet. A destination BitmapData object. That s the stage bitmap.

In the Map example file, the tile sheet is embedded and its BitmapData created like this: [Embed(source="../../images/tileSheet.png")] private var TileSheet:Class; private var _tileSheetImage:DisplayObject = new TileSheet(); private var _tileSheetBitmapData:BitmapData = new BitmapData ( _tileSheetImage.width, _tileSheetImage.height, true, 0 ); When the application class initializes, it _tileSheetBitmapData using the draw method.

It is still up to the developer to make sure the application compiles, that the developed pieces perform to specification, and that the individual pieces fit together and play nicely This leaves developers to perform two important tests: unit tests and system tests Sometimes, developers will also be involved in integration, regression, and other performance tests, but overall, the two important ones that should always be performed are the unit tests and system tests Unit testing is the actual testing of the individual pieces of an application In this case, the specific components, such as the data access methods, are each tested individually System testing is testing the overall application as a whole to make sure the application functions to the specifications that the developers received It becomes obvious, especially on larger applications, that testing the individual pieces can become a daunting task.

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.

_tileSheetBitmapData.draw(_tileSheetImage); We need another bitmap on which to display the tiles. _backgroundBitmap is a bitmap that is the same size as the stage. We can blit the tiles onto it. private = new private = new var _backgroundBitmapData:BitmapData BitmapData(stage.stageWidth, stage.stageHeight, true, 0); var _backgroundBitmap:Bitmap Bitmap(_backgroundBitmapData);