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This is the stage at which ASP .NET initializes the page in memory on the server. It first parses through the definition of the ASPX, initializing each of the controls on the page as it was originally defined. Should this not be the first time the page has been requested, ASP .NET will then look through the view state and update the status of each control according to the name/value pairs that it deserializes out of view state. At this point, it fires the Page.Init event. You can use this event to perform actions upon initializing the page, but UI actions are not permitted because the UI rendering has not yet occurred.

Rules are the heart of the ACS system. When a token is created by ACS, the rules for the related scope are executed. This is the process that allows you to transform the consumer s request into something your application can act on. Rules can also be used to create claims out of thin air, and put them in the resulting token. For example, suppose you wanted to place a claim in the token that represents the consumer s customerid, to make it easier for your service to identify the account the request is related to. You could create a rule that says, If this is for issuer MaineReversal, add a claim called customerid with a value of 31415. Figure 17.7 shows how you could create this rule. Another rule you could use would assign a new role value based on mappings you ve worked out with the customer. Perhaps their system tracks their users with a role of ServiceManager this would be a group the user belongs to at Maine Reversal. Your system doesn t know that role name, and you don t want to add all of your customers role types to your system that would get very complex very quickly. The rule in figure 17.8 creates the roles claim with the manager value.

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Most of GUI programming is devoted to handling events through callbacks from the graphical interface. Events are described in 8. To display a message box containing the "Hello, World!" string, you have to configure the button so that when its Click event is fired, a function is called. In the example, you pass a function to the Add method for the button s Click event, which adds an event handler to an event source. You then add the button to the form and call the form s Show method to display it. Note that this code should be executed using fsi.exe. It won t run as a stand-alone application unless you add the following line at the end: Application.Run(form) This line relates to the event loop of a GUI application, and it s required to handle events such as button clicks. Moreover, if you execute the compiled program, notice that the window uses the classic Windows look and feel rather than the more fashionable look and feels featured by recent versions of Windows. This can be easily addressed by adding the following call to the EnableVisualStyles static method, right after the open statement: Application.EnableVisualStyles() If you use fsi.exe, both visual styles and the event loop are handled by F# Interactive.

If possible, each client s secondary interface should have DNS entries configured for a DNS server local to the Xsan subnet, such as a backup metadata controller. Having DNS services configured on the metadata networks can help prevent DNS-related timeouts should the primary interface fail. These failures can be particularly detrimental on OS X metadata controllers, causing extremely laggy performance and possibly complete SAN downtime. With Xsan 2, this is less of an issue, but Xsan 1 is fairly sensitive to DNS problems.

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