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So, if you attempt to access web content with the URL wwwsomesitecom/~luther/services/CalendarServiceashx, Silverlight will check for wwwsomesitecom/clientaccesspolicyxml and then (if the former is not found) wwwsomesitecom/crossdomainxml If neither of these files exists, or if one exists but it doesn t grant access to the domain of your Silverlight application, your application won t be able to access any content on that website Often, companies that provide public web services will place them on a separate domain to better control this type of access For example, the photo-sharing website Flickr won t allow you to access http://wwwflickrcom, but it will allow you to access http://apiflickrcom..

IF (@@ROWCOUNT = 0) BEGIN -- There is currently no application state available, -- so we insert the application state into the state table SET @CreditCardValidationStatus = 0; SET @InventoryAdjustmentStatus = 0; SET @ShippingStatus = 0; SET @AccountingStatus = 0; -- Insert the state record INSERT INTO ApplicationState ( ConversationGroupId, CreditCardValidation, InventoryAdjustment, Shipping, Accounting ) VALUES ( @conversationGroup, @CreditCardValidationStatus, @InventoryAdjustmentStatus, @ShippingStatus, @AccountingStatus ) END DECLARE @messageTypeName NVARCHAR(256); DECLARE @ch UNIQUEIDENTIFIER; DECLARE @messageBody XML; -- Inner Loop (Message Processing) WHILE (1 = 1) BEGIN WAITFOR ( RECEIVE TOP (1) @messageTypeName = message_type_name, @messageBody = CAST(message_body AS XML), @ch = conversation_handle FROM [ProductOrderQueue] WHERE conversation_group_id = @conversationGroup ), TIMEOUT 1000 IF (@@ROWCOUNT = 0) BEGIN BREAK END

Note For more information on using the Script Component to create a destination, see the references at msdn.microsoft.com/en-us/library/ms137640.aspx and msdn.microsoft.com/enus/library/ms135939.aspx.

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Before you attempt to use the examples in this chapter with different websites, you should verify that Tip

IF (@messageTypeName = 'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog') BEGIN END CONVERSATION @ch; END IF (@messageTypeName = 'http://schemas.microsoft.com/SQL/ServiceBroker/Error') BEGIN -- Handle errors END CONVERSATION @ch; END IF (@messageTypeName = 'http://ssb.csharp.at/SSB_Book/c06/ProductOrderMessage') BEGIN -- Process the message SELECT @messageBody; SET @CreditCardValidationStatus = 1; END CONVERSATION @ch; END END -- Update the application state UPDATE ApplicationState SET CreditCardValidation = @CreditCardValidationStatus, InventoryAdjustment = @InventoryAdjustmentStatus, Shipping = @ShippingStatus, Accounting = @AccountingStatus WHERE ConversationGroupId = @conversationGroup; COMMIT TRANSACTION; END END Let s walk through this stored procedure step by step. In the first step, you use the GET CONVERSATION GROUP T-SQL statement to acquire a conversation group lock on an available conversation group: WAITFOR ( GET CONVERSATION GROUP @conversationGroup FROM [ProductOrderQueue] ), TIMEOUT 1000 In the second step, you use the returned conversation group identifier to retrieve the application state for the current locked conversation group: SELECT @CreditCardValidationStatus = CreditCardValidation, @InventoryAdjustmentStatus = InventoryAdjustment, @ShippingStatus = Shipping, @AccountingStatus = Accounting FROM ApplicationState WHERE ConversationGroupId = @conversationGroup;

they support cross-domain access. To do so, try requesting the clientaccesspolicy.xml and crossdomain.xml files in the root website.

Tip Many other operations, including FTP, e-mail, and connecting web services can be accomplished using SSIS. Another good real-time example of when you could use SSIS is when you need to import a text file generated from another system or to import data into a different system. You can run these imports based on schedules.

In 13, you learned what the clientaccesspolicy.xml file looks like. The crossdomain.xml file is similar. For example, here s a crossdomain.xml file that allows all access (which you ll find on the Flickr website http://api.flickr.com): < xml version="1.0" > <!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"> <cross-domain-policy> <allow-access-from domain="*" /> </cross-domain-policy> On the other hand, the Twitter social networking website uses its clientaccesspolicy.xml file to allow access to just a few domains, which means your Silverlight code won t be able to retrieve any of its content: < xml version="1.0" > <!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"> <cross-domain-policy> <allow-access-from domain="*.twitter.com" /> <allow-access-from domain="*.discoveringradiance.com" /> <allow-access-from domain="*.umusic.com" /> <allow-access-from domain="*.hippo.com.au" /> <allow-access-from domain="*.ediecareplan.com" /> <allow-access-from domain="*.yourminis.com" /> <allow-access-from domain="*.korelab.com" /> <allow-access-from domain="*.zoozoom.com" /> </cross-domain-policy> If you need to access web content from a website that doesn t allow cross-domain access, there s just one option. You can build a server-side proxy. To implement this design, you must create an ASP .NET website that includes a web service, as you learned to do in 13. Your web page will be allowed to call that service, because it s on the same website (and even if it isn t, you ll simply need to add your own clientaccesspolicy.xml file alongside the web service). Your web service can then access the website you want, and return the data to your page. This works, because the web service is allowed to call any website, regardless of the crossdomain access rules. That s because web services run on the server, not the browser, and so they don t face the same security considerations. Figure 17-1 compares this arrangement to the more straightforward direct downloading approach.

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