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This code could not be simpler while the context is not established (i.e., not secure), we exchange tokens using our socket s associated streams (and being sure to flush the output stream to compel the server to respond in a timely manner). Once enough tokens have been exchanged to convince both parties of each other s authenticity, the isEstablished() flag returns true, and we return the established context. If we were dealing with a context exchange over e-mail, or something more exotic (RFC 1149), we could use additional methods in the GSSContext to acquire the bytes representing the appropriate tokens directly. These are comprehensively documented in the JavaDoc for the GSSContext API. Once run, the output of the client should be something like the following:

1. Consider the Seabird program. Would it be possible to instantiate an Aircraft object instead of a Seacraft object and change the methods inside Seabird accordingly If so, make the changes. If not, explain how the present program would need to be altered to enable this and then make the changes. 2. Add a SuperPoke button to CoolBook, enabling one user to send a message to another. 3. Having two different communities for SpaceBook and CoolBook is clearly a disadvantage. Assume you can make minor changes to the SpaceBook, MySpaceBook, and MyOpenBook classes, and see whether you can remove the community collection from MyCoolBook, routing all accesses back through MyOpenBook to SpaceBook.

Config Acquiring context Logging in... OK, Logged in. Retrieving and returning the Subject from the login context. Logged in Subject: Principal: login/java@JETSPEED Private Credential: Ticket (hex) = 0000: 61 81 E5 30 81 E2 A0 03 0010: 45 54 53 50 45 45 44 A2 0020: A1 14 30 12 1B 06 6B 72 0030: 54 53 50 45 45 44 A3 81 0040: 10 A1 03 02 01 01 A2 81 0050: 34 5F D4 7A 96 E4 D1 99 0060: 1F 32 74 CE 2F 1B 16 9C 0070: B1 C1 93 D5 9F 80 63 FB 02 01 05 A1 0A 1B 08 4A 1D 30 1B A0 03 02 01 00 62 74 67 74 1B 08 4A 45 AF 30 81 AC A0 03 02 01 9F 04 81 9C 6B AA 82 71 B7 DF D7 3E 6E E3 9F 9A 76 21 E6 08 8E 88 CA 78 31 4D 2A 96 2D CF F6 1B a..0...........J ETSPEED..0...... ..0...krbtgt..JE TSPEED...0...... ............k..q 4_.z.......>n... .2t./...v!.....x ......c.1M*.-...

<Canvas xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="640" Height="480" Background="White" x:Name="Page"> <Rectangle Width="211" Height="176" Stroke="#FF000000" Canvas.Left="8" Canvas.Top="64"> <Rectangle.Fill> <RadialGradientBrush> <GradientStop Color="Red" Offset="0"/> <GradientStop Color="Orange" Offset="0.17"/> <GradientStop Color="Yellow" Offset="0.34"/> <GradientStop Color="Green" Offset="0.51"/> <GradientStop Color="Blue" Offset="0.68"/> <GradientStop Color="Indigo" Offset="0.85"/> <GradientStop Color="Violet" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle> </Canvas>

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The RadialGradientBrush gives you some extra control over how the gradient is painted. The GradientOrigin allows you to set the point at which the gradient emanates. It doesn t have to be the center of the circle, so setting it to a different value will stretch the gradient from the center of the circle to the specified point. You set it using a normalized (x,y) value, where (0.5,0.5) is the center of the circle, (1,1) is the lower right-hand side

renderAdministratorTools(request, response); } if (request.IsUserInRole(KEY_ACCOUNT_MANAGER_ROLE)) { renderKAMTools(); renderCustomerTools(); } else if (request.IsUserInRole(SUPPORT_ROLE)) { renderSupportTools(); renderCustomerTools(); } else if (request.IsUserInRole(HELPDESK_ROLE)) { renderCustomerTools(); renderHelpdeskTools(); } if (request.IsUserInRole(CUSTOMER_ROLE)) { if (customerNameAvailable(ua)) { renderCustomerName(ua); } renderCustomerTools(); } else { renderDefaultPortlet(request, response); } } }

The role of the Fa ade pattern is to provide different high-level views of subsystems whose details are hidden from users. In general, the operations that might be desirable from a user s perspective could be made up of different selections of parts of the subsystems.

While this code is sensible, it is not easy to follow. The number of conditions involved makes it difficult to determine whether all of the decisions made are correct. For example, will staff be members of the customer group anyway If so, then we risk rendering the customer tools twice for some administrative users. We can hide some of this functionality inside the rendering methods, but this approach won t necessarily shield us from the difficulty of determining whether the application is doing the right thing from a business point of view.