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{ return string.Compare(x.PartitionKey, y.PartitionKey, true, System.Globalization.CultureInfo .InvariantCulture) == 0; } public int GetHashCode(TableServiceEntity obj) { return obj.PartitionKey.GetHashCode(); } } }
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Note: The Add method that takes an IEnumerable parameter should check the number of items in the batch and the size of the payload before calling the SaveChanges method with the SaveChangesOptions.Batch option. For more information about batches and Windows Azure table storage, see the section, Transactions in aExpense, in 5, Phase 2: Automating Deployment and Using Windows Azure Storage, of the book, Windows Azure Architecture Guide, Part 1: Moving Applications to the Cloud, available at http://msdn.microsoft.com/en-us/ library/ff728592.aspx. The generic interface and class have a type parameter T that derives from the Windows Azure TableServiceEntity type that you use to create your own table types. For example, in the Surveys application, the SurveyRow and QuestionRow types derive from the Table ServiceEntity class. The interface defines several operations: the Query method returns an IQueryable collection of the type T, and the Add, AddOrUpdate, and Delete methods each take a parameter of type T. In the AzureTable class, the Query method returns a TableServiceQuery object, the Add and AddOrUpdate methods save the object to table storage, and the Delete method deletes the object from table storage. To create a mock object for unit testing, you must instantiate an object of type IAzureTable. The following code example from the SurveyStore class shows the constructor.
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public SurveyStore(IAzureTable<SurveyRow> surveyTable, IAzureTable<QuestionRow> questionTable) { this.surveyTable = surveyTable; this.questionTable = questionTable; }
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wor king with data in the surv eys a pplication
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The constructor takes parameters of type IAzureTable that enable you to pass in either real or mock objects that implement the interface. This parameterized constructor is invoked in two different scenarios. The Surveys application invokes the constructor indirectly when the application uses the SurveysController MVC class. The application uses the Unity dependency injection framework to instantiate MVC controllers. The Surveys application replaces the standard MVC controller factory with the UnityControllerFactory class in the OnStart method in both web roles, so when the application requires a new MVC controller instance, Unity is responsible for instantiating that controller. The following code example shows part of the ContainerBootstrapper class from the TailSpin.Web project that the Unity container uses to determine how to instantiate objects.
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public static class ContainerBootstraper { public static void RegisterTypes(IUnityContainer container) { var account = CloudConfiguration .GetStorageAccount("DataConnectionString"); container.RegisterInstance(account); container.RegisterType<ISurveyStore, SurveyStore>(); container.RegisterType<IAzureTable<SurveyRow>, AzureTable<SurveyRow>>( new InjectionConstructor(typeof (Microsoft.WindowsAzure.CloudStorageAccount), AzureConstants.Tables.Surveys)); container.RegisterType<IAzureTable<QuestionRow>, AzureTable<QuestionRow>>( new InjectionConstructor(typeof (Microsoft.WindowsAzure.CloudStorageAccount), AzureConstants.Tables.Questions));
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The last two calls to the RegisterType method define the rules that tell the Unity container how to instantiate the AzureTable instances that it must pass to the SurveyStore constructor.
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When the application requires a new MVC controller instance, Unity is responsible for creating the controller, and in the case of the SurveysController class, Unity instantiates a SurveyStore object using the parameterized constructor shown earlier, and passes the SurveyStore object to the SurveysController constructor. In the second usage scenario for the parameterized SurveyStore constructor, you create unit tests for the SurveyStore class by directly invoking the constructor and passing in mock objects. The following code example shows a unit test method that uses the constructor in this way.
[TestMethod] public void GetSurveyByTenantAndSlugNameReturnsTenantNameFrom PartitionKey() { string expectedRowKey = string.Format( CultureInfo.InvariantCulture, "{0}_{1}", "tenant", "slug-name"); var surveyRow = new SurveyRow { RowKey = expectedRowKey, PartitionKey = "tenant" }; var surveyRowsForTheQuery = new[] { surveyRow }; var mock = new Mock<IAzureTable<SurveyRow>>(); mock.SetupGet(t => t.Query) .Returns(surveyRowsForTheQuery.AsQueryable()); var store = new SurveyStore(mock.Object, default(IAzureTable<QuestionRow>)); var survey = store.GetSurveyByTenantAndSlugName("tenant", "slug-name", false); Assert.AreEqual("tenant", survey.Tenant); }
The test creates a mock IAzureTable<SurveyRow> instance, uses it to instantiate a SurveyStore object, invokes the GetSurveyByTenantAndSlugName method, and checks the result. It performs this test without touching Windows Azure table storage. The Surveys application uses a similar approach to enable unit testing of the other store components that use Windows Azure BLOB and table storage.
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