.NET/Java PDF, Tiff, Barcode SDK Library

Gateway to intercept server-bound calls Parser to make sense of AMF messages Serializer and deserializer to transform objects between ActionScript 3.0 (AS3) and Java

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A third short movie with a Japanese anime look and theme, under the codename Project Durian, is currently in production. The Foundation calls these movies and games open projects, as in the term open source. This openness isn t limited to downloading the final, finished versions and sharing them with your friends, although that right is granted. More significantly, all Blender project files and other source materials for the animations Elephants Dream (2005) and Big Buck Bunny (2007) and the game Yo Frankie! (2008) are available for download or on DVD. You can find out how these projects were made or make your own, alternative versions of them. That just doesn t happen with conventional movie studios and game-development houses, because too many trade secrets are involved in the production pipeline.

For example, the fact that the operator AREA applies to values of type POLYGON implies that the same operator AREA can be invoked on a value of type RECTANGLE (ie, rectangles can be substituted for polygons), even if there are indeed as there probably will be, for efficiency reasons two distinct implementation versions of AREA under the covers Note: The term inclusion polymorphism derives from the fact that, eg, the set of all rectangles is included in the set of all polygons (just as the set of all circles is included in the set of all ellipses) Overloading polymorphism means we have several distinct operators with the same name (and the user does need to know that the operators in question are in fact distinct, with distinct though preferably similar semantics) Overloading polymorphism has nothing to do with subtyping, and it doesn t imply substitutability.

Manager to coordinate with and delegate responsibility to server-side objects Messaging service provider to send and receive messages

It shouldn t really even be mentioned in connection with subtyping, except to make it clear (as I m trying to do here) that it has nothing to do with the subject under discussion Tockey s Draw example is an example of overloading9 Note: The foregoing definitions notwithstanding, I should now warn you that some writers very unfortunately, in my opinion use the term overloading to mean inclusion polymorphism Caveat lector!.

Figure 6-2. Big Buck Bunny was the second open movie produced by the Blender Foundation. One of the characters from this animated short later starred in his own game, Yo Frankie!

By data services, I mean a class of products that enable remoting and messaging over AMF and protocols like Real Time Messaging Protocol (RTMP). RTMP is a proprietary protocol developed by Adobe Systems for streaming audio, video, and data over the Internet. More information on RTMP can be found on Wikipedia at http://en.wikipedia.org/wiki/Real_Time_Messaging_Protocol and at http://osflash.org/documentation/rtmp. As mentioned, there are two data services implementations from Adobe and a few open source alternatives. Following are the most popular ones:

Tockey s article concludes with a reference to another article, The Liskov Substitution Principle, by Robert C. Martin (described by Martin himself as the second of my Engineering Notebook columns for The C++ Report ) so the next thing I did was take a look at that article, too. Almost the first thing I found was the following paraphrase of the Liskov Substitution Principle (uppercase and boldface as in the original):

LifeCycle Data Services (Adobe): http://www.adobe.com/products/livecycle/ dataservices/ BlazeDS (open source from Adobe): http://opensource.adobe.com/wiki/display/ blazeds/ Granite Data Services (GDS http://www.graniteds.org/ WebORB for Java: http://www.themidnightcoders.com/weborb/java/ OpenAMF http://sourceforge.net/projects/openamf/

8. The kind of polymorphism displayed by the operators of the relational algebra is called generic polymorphism, on the grounds that loosely speaking those operators apply to all possible relations, generically. 9. What s more, that example violates the suggested principle that the several distinct operators in question should have similar semantics. Indeed, the kind of polymorphism displayed in that example might better be called punning polymorphism.