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The Surveys application stores its data in the cloud using a combination of Windows Azure tables and BLOBs. The mobile client application needs to access this data. For example, it must be able to retrieve survey definitions before it can display the questions to the phone user, and it must be able to save completed survey responses back to the cloud where they will be available for analysis by the survey creator. The mobile client application must be able to reliably download survey definitions and reliably upload survey responses. Making sure that surveys download reliably is important because survey creators want to be sure that surveys are delivered to all potential surveyors in order to maximize the number of responses. Making sure that surveys upload reliably is important because survey creators want to receive the maximum number of completed surveys, with no duplication of results. The developers at Tailspin are aware that some surveyors may have limited bandwidth available, so they wanted to control the amount of bandwidth used to transfer data between the phone and the service. In addition to this, the developers at Tailspin want to make sure that the application performs well when it transfers data to and from the cloud. The developers also wanted a solution that was as simple as possible to implement, and that they could easily customize in the future if, for example, authentication requirements changed. Finally, again with a view to the future, the developers wanted a solution that could potentially work with platforms other than Windows Phone 7. Tailspin considered three separate aspects of the solution: how to implement the server, how to implement the client, and the format of the data that the application moves between the phone and the cloud.
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Tailspin is using the WCF REST programming model to exchange data between the mobile client and the cloud-based service.
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Exposing the Data in the Cloud The developers at Tailspin decided to use the Windows Communication Foundation (WCF) Representational State Transfer (REST) programming model to expose the data in the Tailspin Surveys service. Tailspin also considered using WCF Data Services, but when Tailspin began developing the mobile client application, the WCF Data Services support for Windows Azure table storage was still a pre-release version.
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connecting with serv ices
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Data Formats Because Tailspin is using a custom WCF service, they must use custom data transfer objects to exchange data between the mobile client application and the cloud-based service. Tailspin chose to use a Java Script Object Notation (JSON) format for moving the data over the wire because it produces a compact payload that reduces bandwidth requirements, is relatively easy to use, and will be usable on platforms other than the Windows Phone 7 platform. Note: If, in the future, Tailspin moves to WCF Data Services, it will no longer require the custom data transfer objects because WCF Data Services use the OData protocol to move data over the wire. Tailspin also considered compressing the data before transferring it over the network to reduce bandwidth utilization, but the developers at Tailspin decided that the additional CPU and battery usage on the phone that this would require outweighed the benefits in this particular case. You should evaluate this trade-off between the cost of bandwidth and battery consumption in your own application before you decide whether to compress data that you need to move over the network. Consuming the Data The developers at Tailspin implemented a set of custom classes in the mobile client application to handle the data transfer with the Tailspin web service. The classes on the mobile client interact with the WCF REST service and parse the data received from the service. Tailspin s analysis of the data transfer requirements for the Windows Phone 7 application identified only two types of interaction with the service: a Get Surveys operation and a Send Survey Result operation, so the implementation of custom client should be quite simple. Furthermore, the Send Survey Result operation always appends the result to the store on the server so there are no concurrency issues, and survey creators cannot modify a survey design after they publish it so there are no versioning issues. Note: In the future, Tailspin may decide to use WCF Data Services and the OData protocol. OData client libraries, including a version for Windows Phone 7, are available for download on the Open Data Protocol website (http://www.odata.org/ developers/odata-sdk). At the time of this writing, the version of the OData Client Library for Windows Phone 7 was a prerelease version. You should check to see whether a later release is available.
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In the future, Tailspin would like to use WCF Data Services because of its support for the OData standard. For more information about OData, see the Open Data Protocol website (http://www.odata.org).
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On the phone, additional CPU usage affects both the responsiveness of the device and its battery life.
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