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Note: For more information about Windows Azure table storage, including partition keys and row keys, see 5, Phase 2: Automating Deployment and Using Windows Azure Storage, of the book, Moving Applications to the Cloud. It is available on MSDN (http://msdn.microsoft.com/en-us/library/ff728592.aspx). The following table shows the structure of the user device table in Windows Azure table storage that records which physical devices, identified by a unique URI allocated by the MPNS, are associated with each user.
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Column User name Device URI Notes A string holding the user name. This column is the table s partition key. A string holding the device s unique URI that the MPNS uses to push notifications to the device. This column is the table s row key.
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The structure of this table reflects the fact that a user can have more than one device, each with a unique URI for the MPNS to use. Tailspin optimized this table to support queries that look for the list of devices owned by a user. Note: With the current implementation, it s possible for a user who owns multiple Windows Phone 7 devices to enter different lists of preferred tenants on the different devices. The data model in the Tailspin Surveys service only supports a single list of preferred tenants for each user, so the user might see unexpected results on some of their devices. Tailspin plans to address this issue in the next version of the application. Identifying Which Devices to Notify Figure 5 outlines the process that the Tailspin Surveys service uses to identify which devices to notify when a subscriber adds a new survey.
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NewSurveyNotificationCommand class
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FilteringService class GetUsersForSurvey method
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Other Filters Tenant Filter GetUsers method
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UserDeviceStore class wraps Windows Azure Storage
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TenantFilterStore class wraps Windows Azure Storage
figure 5 Building a list of devices to notify about a new survey
Identifying which devices to notify when a tenant adds a new survey requires two queries. The first query gets the list of users who are interested in that particular survey and this query uses a filtering service to build this list of users based on user preferences stored in Windows Azure table storage. The second query uses the list of users to find a list of devices to notify, again using data stored in Windows Azure table storage that maps users to devices. Selecting Surveys to Synchronize Figure 6 outlines the way that the Tailspin application delivers new, relevant surveys to the mobile client application when it synchronizes with the Tailspin Surveys service. The user initiates the synchronization process from the SurveyListView page, and the view model invokes a method in a service class to retrieve the list of new surveys. In the Tailspin Surveys service, the application gets the list of surveys to return to the client from a filtering service class.
In the current version of the application, obtaining the list of users who are interested in a particular survey uses just a single criterion: the user s list of preferred tenants. In the future, the criteria may become more complex if, for example, users can express preferences for location, survey length, or some other attribute of the survey. The developers at Tailspin have implemented an extensible filtering mechanism to accommodate any future additions to the list of supported criteria.
ch a pter si x
Surveys
Survey 1 Survey 2 Survey 3 Save
SurveyListViewModel class
SurveysSynchronizationService class
StartSyncCommand delegate
StartSynchronization method
Invoke the GetNewSurveys web method passing last synchronization date
SurveysService class GetSurveys web method
FilteringService class GetSurveysForUser method
Other Filters Tenant Filter GetSurveys method
TenantFilterStore class wraps Windows Azure Storage SurveyStore class wraps Windows Azure Storage
figure 6 Building a list of new surveys for a user
Identifying which surveys to download when a user synchronizes from the mobile client requires two queries. The first query returns a list of tenants based on user preferences stored in Windows Azure table storage. In the current version of the application, these preferences are lists of tenants that the user is interested in. The second query, which is inside the filter, uses the list of tenants to return a list of new surveys from those tenants. Now is a good time to walk through the code that implements the filtering of the list of surveys in more detail. As you go through this section, you may want to download the Visual Studio solution for the Tailspin Surveys application from CodePlex (http://go.microsoft.com/ fwlink/ LinkId=205602).
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