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If an environment has side-by-side execution of different versions of Enterprise Library, or more important, if an application is using a partial migration strategy to slowly migrate to a new version of Enterprise Library, two versions of the configuration data must be maintained by the specific version of the Enterprise Library configuration console for that version of Enterprise Library. This is because not only is the data stored in different locations for version 2.0 and version 1.1, but the schema of the configuration data is also different. The configuration console for Enterprise Library for .NET Framework 1.1 can be used only to configure Enterprise Library for .NET Framework 1.1 application blocks. Generally speaking, the easiest way to migrate configuration data from version 1.1 to version 2.0 is to reenter the version 1.1 configuration data into the version 2.0 configuration console. It is possible to manually convert the configuration data by hand, but this technique is somewhat difficult and error-prone; hence, it is not recommended. Currently, a tool does not exist to perform this transformation.

screen.copyPixels ( _tileSheetBitmapData, sourceRectangle, destinationPoint, null, null, true ); } } } Spend as much time as you need to understand how the Map example works before moving on to the more complex examples ahead. It s the heart of the tile-based game engine we re using in this chapter. If you re thinking of making your own tile-based game, now might be a good time to take a short break from reading to see if you can create your own game world map using these techniques.

In technical implementation terms, it means E B V N a state that previously existed only in a database form must also be saved in the form of a file or another persistent storage medium that the HTTP server manages When the state is modified, the server application is responsible for modifying the database and file at the same time When the HTTP server manages the entity tag calculations, each resource has two separate representations The retrieving representation is static and is managed by the HTTP server The posting representation is dynamic and is managed by the server application framework Technically speaking, from a browser perspective HTTP GET results in a file being retrieved, and HTTP POST or PUT results in data being posted to a JSP or ASPNET file From a URL perspective, a static HTTP validation application would be similar to Figure 4-3.

Migrating to Enterprise Library for .NET Framework 3.0 has some of the same challenges and strategies as migrating to version 2.0. However, it is not necessary to have .NET Framework 3.0 installed on the user s desktop to use Enterprise Library for .NET Framework 3.0, since the 2.0 version was developed before Windows Communication Foundation (WCF) was provided with .NET Framework 3.0 (unless you plan on utilizing .NET Framework 3.0 specific features such as WCF).

Now that we have a game world, we can start to add characters and objects. Run the SWF file in the Character folder, and you ll see something that looks like Figure 8-8.

An individual book is retrieved by using its ISBN number, which is unique for every book When retrieving a book, the static URL /ajax/books/[ISBN]xml is used The URL maps to a file managed by the HTTP server Because the file is managed by the HTTP server, when the client attempts to retrieve the document, the HTTP server will send an ETag identifier based on the file To update the file, the dynamic URL /ajax/servlet/LibrarianServlet is used It is impossible to update the data by using the static URL because the static URL is a file that when posted to results in nothing being updated That a static file does nothing is fairly logical and is the reason why server application frameworks were created in the first place.

Figure 8-8. A character is added to the game world. The character doesn t move yet; it just hangs in space. Before we make it run and jump around the screen, let s take a close look at how it was added to the game.

With that said, it would be beneficial to utilize the new features provided by Enterprise Library for .NET Framework 3.0, even if your current environment is still .NET Framework 2.0.