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Although you can create the messaging server as a separate application, it s tidier to place it in the same application as the policy server. Because the policy server does its listening and request-handling work on separate threads, the messaging server can do its work at the same time. Like the policy server, the messaging server is broken into two classes: MessengerServer, which listens for requests and tracks clients, and MessengerConnection, which handles the interaction of a single client. To see the full code, refer to the downloadable examples for this

COMMIT TRANSACTION; END END Now when you send an OrderRequestMessage to the OrderService, all the necessary steps are executed asynchronously in the background. After getting back the final response message from the OrderService, you can make a SELECT on all the tables. You ll get a result like the one shown in Figure 6-13.

On the File menu, click on Save and save the drawing to a local file location as a Visio Drawing, airport.vsd in this example. Click on the File menu again, and this time click on Save As and choose the type as a Web Drawing (*.vdw).

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chapter In this section, you ll just explore the differences between the policy server and messaging server First, the messaging server performs its listening on a different port As described earlier, Silverlight allows socket-based applications to use any port in a limited band from 4502 to 4532 The messaging server uses port 4530: listener = new TcpListener(IPAddressAny, 4530); When the messaging server receives a connection request, it performs an extra step As with the policy server, it creates an instance of a new class (in this case, MessengerConnection) to handle the communication Additionally, it adds the client to a collection so it can keep track of all the currently connected users This is the only way you can allow interaction between these clients for example, allowing messages to be sent from one user to another.

Note .vdw is the new file format. When published to SharePoint, this is the file that is rendered in the browser. You can edit this file and republish it in the event of any modifications. In contrast, a .vsd file can t be used on the SharePoint platform and can t be rendered. .vdw files use Extensible Application Markup Language (XAML) to represent diagrams. XAML is primarily meant for creating UI elements using the .NET framework with WPF or Silverlight. For more information on XAML, read the article at http://msdn.microsoft.com/en-us/library/cc189036(VS.95).aspx. To run Visio web diagram (.vwd) files, be sure that the SharePoint Server Enterprise Site Collection Features feature is activated. You ll find this on the Site Collection Features under the Site Collection Administration of your web application.

As you ve seen in the previous section, you can easily implement a Service Broker service that spans several dialogs. The conversation group concept also makes it easy to store application state between the individual dialogs that are spanned across the different Service Broker services. As you might expect, the sample application from the previous section has one drawback: what happens when the InventoryService can t process the order because too few items are in stock In this case, the response message contains a 0 (<InventoryResponse>0</InventoryResponse>), indicating that the request didn t process successfully. But what if the CreditCardService and the AccountingService already processed the request In this case, your application will be in an invalid state, because the request would have been processed on some services and not on others. The solution to this problem is a concept referred to as compensating transactions. With a compensation transaction, you can undo an action that already executed earlier. In this case, this means that a corresponding compensation transaction must undo the operations of the CreditCardService and the AccountingService. For this reason, you have to create two additional message types and the [http://ssb.csharp.at/SSB_Book/c06/CreditCardContract] and [http://ssb.csharp.at/SSB_Book/c06/AccountingContract] contracts. Take a look at Listing 6-37.

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