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The simplicity of developing the stock quote application proves the power that ASP.NET affords you as a web developer. Some fairly complex stuff was going on behind the scenes, enabling you to focus on the business logic for your application, instead of all the underlying plumbing necessary to get it to work. Figure 2-22 shows how the underlying ASP.NET components all work together in an ASP .NET application. At the bottom of the figure, you see the host operating system on which the web server runs. The web server for ASP.NET can be Cassini or IIS. The web server receives the incoming request from the browser and passes it to the ASP.NET runtime, which sits on top of the operating system. This runtime can use a global application file, called Global.asax, to manage functions that are central to your web site. A number of modules are available to the runtime for handling sessions, authentication, and caching. Finally, your application or web service sits on top of these modules and executes. Upon executing, it generates HTML markup that gets passed back to the process that initiated the request through the web server.

client.establishContext("dave", "MyPassword", "login/java"); GSSContext ctx = client.handshake();

Coplien, J. O. and Schmidt, D. C. Patterns Languages of Program Design. Boston, MA: Addison-Wesley, 1995. Chambers, C., Harrison, B., and Vlissides, J. O. A Debate on Language and Tool Support for Design Patterns. Proceedings of the 27th ACM SIGPLAN-SIGACT Symposium on Principles of Programming Languages (2000): 277 289. Gamma, E., Helm, R., Johnson, R., and Vlissides, J. O. Design Patterns: Elements of Reusable Object-Oriented Software. Boston, MA: Addison-Wesley, 1995. Gil, J. and Lorenz, D. H. Design Patterns vs. Language Design. Proceedings of the Workshop on Language Support for Design Patterns and Object-Oriented Frameworks (LSDF), (ECOOP 1997): 108 111. Meyer, Bertrand. Object-Oriented Software Construction, Second Edition. Upper Saddle River, NJ: Prentice Hall, 1997. Meyer, Bertrand and Arnout, Karine. Componentization: the Visitor example. Computer 39, no. 7 (2006): 23 30. Schmidt, Doug. Using Design Patterns to Develop Reusable Object-Oriented Communication Software. Communications of the ACM 38, no. 10 (1995): 65 74.

In the stock quote application, when the web browser requested the page from the server, the server recognized the .aspx page name extension as an ASP.NET page, and passed the request to the ASP.NET runtime, which processed the ASP.NET code and returned the output to the client. Take a look back at Listing 2-1, where the page was defined using extended HTML. If you look at the code being rendered by the browser (by selecting View Source from your browser when viewing the Default.aspx page), you ll see something different. Take a look at Listing 2-2.

Finally, we test to confirm that the context was established:

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System.out.println("Server context established:" + ctx.isEstablished());

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>Untitled Page</title> </head> <body> <form name="form1" method="post" action="Default.aspx" id="form1"> <div> <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKMTU5MTA2ODYwOWRk1kQjjKUNXCMmyhw9mwUkqs1+CdU=" /> </div> <div> <input name="txtTicker" type="text" id="txtTicker" /> <input type="submit" name="btnGet" value="Get" id="btnGet" /> <span id="lblQuote"></span> </div> <div> <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWAwKQ0uDFBALGsPqoBgKLk8m1C0va3iCLI38aZ+8cKQVn2KcWFC3g" /> </div> </form> </body> </html>

The Adapter pattern is found wherever there is code to be wrapped up and redirected to a different implementation. In 2002, Nigel Horspool and I developed a system called Views that enabled an XML specification of a Windows GUI to run on the cross-platform version of Windows called Rotor. The Views engine ran with the GUI program and adapted Views method calls to Windows calls. That benefited the clients (students) because they could use a simpler interface to GUI programming.

Assuming that the return from ctx.isEstablished() is true, we can be confident that the remote server is logged in as login/java , and that it has authenticated our user as dave . We ve covered the bulk of the createContext(String,String,String) method in our discussion of the GSSContextUtil class, so we ll just concentrate on the specifics of the handshake() method. Initially we specify the attributes that we want the secure context to have: