CHAPTER 1 THE PHILOSOPHY OF .NET 5 (Web hosting script)
CHAPTER 1 THE PHILOSOPHY OF .NET 5 approach for such programs would be to use a lower-level language (such as C++) where appropriate. Alas, while Java does provide a limited ability to access non-Java APIs, there is little support for true cross-language integration. Life As a COM Programmer The Component Object Model (COM) was Microsoft s previous application development framework. COM is an architecture that says in effect, If you build your classes in accordance with the rules of COM, you end up with a block of reusable binary code. The beauty of a binary COM server is that it can be accessed in a language-independent manner. Thus, C++ programmers can build COM classes that can be used by VB6. Delphi programmers can use COM classes built using C, and so forth. However, as you may be aware, COM s language independence is somewhat limited. For example, there is no way to derive a new COM class using an existing COM class (as COM has no support for classical inheritance). Rather, you must make use of the more cumbersome has-a relationship to reuse COM class types. Another benefit of COM is its location-transparent nature. Using constructs such as application identifiers (AppIDs), stubs, proxies, and the COM runtime environment, programmers can avoid the need to work with raw sockets, RPC calls, and other low-level details. For example, consider the following VB6 COM client code: ‘ This block of VB6 code can activate a COM class written in ‘ any COM-aware language, which may be located anywhere ‘ on the network (including your local machine). Dim c as MyCOMClass Set c = New MyCOMClass ‘ Location resolved using AppID. c.DoSomeWork Although COM can be considered a very successful object model, it is extremely complex under the hood (at least until you have spent many months exploring its plumbing especially if you happen to be a C++ programmer). To help simplify the development of COM binaries, numerous COM-aware frameworks have come into existence. For example, the Active Template Library (ATL) provides another set of C++ classes, templates, and macros to ease the creation of COM types. Many other languages also hide a good part of the COM infrastructure from view. However, language support alone is not enough to hide the complexity of COM. Even when you choose a relatively simply COM-aware language such as VB6, you are still forced to contend with fragile registration entries and numerous deployment-related issues (collectively termed DLL hell). Life As a Windows DNA Programmer To further complicate matters, there is a little thing called the Internet. Over the last several years, Microsoft has been adding more Internet-aware features into its family of operating systems and products. Sadly, building a web application using COM-based Windows Distributed interNet Applications Architecture (DNA) is also quite complex. Some of this complexity is due to the simple fact that Windows DNA requires the use of numerous technologies and languages (ASP, HTML, XML, JavaScript, VBScript, and COM(+), as well as a data access API such as ADO). One problem is that many of these technologies are completely unrelated from a syntactic point of view. For example, JavaScript has a syntax much like C, while VBScript is a subset of VB6. The COM servers that are created to run under the COM+ runtime have an entirely different look and feel from the ASP pages that invoke them. The result is a highly confused mishmash of technologies. Furthermore, and perhaps more important, each language and/or technology has its own type system (that may look nothing like another s type system). An int in JavaScript is not quite the same as an Integer in VB6.
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