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Performance The first option offers the best performance because the client performs almost all the work with no roundtrips to the server until the final POST message containing the complete survey. The second option will introduce some latency into the application; the amount of latency will depend on the number of concurrent sessions, the amount of data in the session objects, and the latency between the web role and Windows Azure table storage. The third option will also introduce some latency because each question will require a roundtrip to the server and each HTTP request and response message will include all the current state data. Scalability All three options scale well. The first option scales well because it doesn t require any session state data outside the browser, the second and third options scale well because they are web-farm friendly solutions that you can deploy on multiple web roles. Robustness The first option is the least robust, relying on fragile JavaScript code. The second option uses sample code that is not production quality, although you could enhance it. The third option is the most robust, using easily testable server-side code. User Experience The first option provides the best user experience because there are no postbacks during the survey creation process. The other two options require a postback for each question. Security The first two options offer good security. With the first option, the browser holds all the survey in memory until the survey creation is complete, and with the second option, the browser just holds a cookie with a session ID, while Windows Azure table storage holds the survey data. The third option is not so secure because it simply serializes the data to Base64 without encrypting it. It s possible that sensitive data could leak during the flow between pages. Tailspin decided to use the third option that passes the survey design data between the two pages as a serialized object. Instead of using cookies, the application stores the data in a hidden field in the form on the pages involved.
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Inside the Implementation Now is a good time to walk through the session data storage implementation that Tailspin selected in more detail. As you go through this section, you may want to download the Visual Studio solution for the Tailspin Surveys application from http://wag.codeplex.com/. The following code example shows how the Action methods in the SurveysController controller class in the TailSpin.Web project deserialize the data sent from the browser. Notice how the hidden Survey parameter has the Deserialize attribute from the ASP.NET MVC 2 Futures package applied.
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[HttpGet] public ActionResult New([Deserialize]Survey hiddenSurvey) { if (hiddenSurvey == null) { hiddenSurvey = (Survey)this.TempData["hiddenSurvey"]; } if (hiddenSurvey == null) { hiddenSurvey = new Survey(); }
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// First time to the page
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var model = new TenantPageViewData(hiddenSurvey); model.Title = "New Survey"; return this.View(model); } [HttpPost] public ActionResult New(Survey contentModel, [Deserialize]Survey hiddenSurvey) { contentModel.Questions = hiddenSurvey.Questions; if (!this.ModelState.IsValid) { var model = new TenantPageViewData<Survey>(contentModel); model.Title = "New Survey"; return this.View(model); }
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contentModel.Tenant = this.TenantName; try { this.surveyStore.SaveSurvey(contentModel); } catch (DataServiceRequestException ex) { } return this.RedirectToAction("Index"); }
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The following code example from the NewQuestion.aspx view shows how the application causes the form data from the client to be serialized by using the Html.Serialize element.
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<% using (Html.BeginForm( AddQuestion , Surveys )) {%> <%: Html.ValidationSummary(true) %> <%: Html.Serialize("hiddenSurvey")%> <%: Html.Hidden("referrer", "addQuestion") %> <dl> <dt> <%: Html.LabelFor(model => model.ContentModel.Text) %> </dt> <dd> <%: Html.TextBoxFor(model => model.ContentModel.Text, new { size = "60" })%> <% } %>
The application stores the definition of a survey and its questions in table storage. To render the questions in a page in the browser, the application uses the MVC EditorExtensions class. When the Display action method in the SurveysController class in the TailSpin.Web.Survey.Public project builds the view to display the survey, it retrieves the survey definition from storage, populates a model, and passes the model to the view. The following code example shows this action method.
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