Cache not hit on retrieve

get all ProductSupplierMaps

   I mentioned unit tests that confirm the effect of EntityManager.DefaultQueryStrategy on navigations. Here are tests 

The tests are called within a test class that constructs a new EntityManager (_manager) for each test. "ModelB" defines Product, Category, and Supplier entities for the NorthwindIB database. Every Product has a Category; every Category can navigate to all the Products that have it as their Category. The ModelBScenarios methods simple get the specified Product or Category from the database with a simple LINQ query.
I hope it is clear in these tests that changing the DefaultQueryStrategy just prior to invoking the navigation property determines whether DevForce satisfies the property from cache or the database.

    [TestMethod]
    public void ShouldNotGoToDbForProductCategoryWhenEMdefaultQueryStrategyIsCacheOnly() {
      var category = GetProductCategoryGivenQueryStrategy(QueryStrategy.CacheOnly);
      DFAssert.IsNulloEntity(category);
    }

    [TestMethod]
    public void ShouldGoToDbForProductCategoryWhenEMdefaultQueryStrategyIsNormal() {
      var category = GetProductCategoryGivenQueryStrategy(QueryStrategy.Normal);
      DFAssert.IsRealEntity(category);
    }
    private ModelB.Category GetProductCategoryGivenQueryStrategy(QueryStrategy strategy) {
      var product = ModelBScenarios.GetSauerkrautProduct(_manager);
      _manager.DefaultQueryStrategy = strategy;
      return product.Category;
    }

    [TestMethod]
    public void ShouldNotGoToDbForCategoryProductsWhenEMdefaultQueryStrategyIsCacheOnly() {
      var products = GetCategoryProductsGivenQueryStrategy(QueryStrategy.CacheOnly);
      Assert.IsTrue(0 == products.Count);
    }

    [TestMethod]
    public void ShouldGoToDbForCategoryProductsWhenEMdefaultQueryStrategyIsNormal() {
      var products = GetCategoryProductsGivenQueryStrategy(QueryStrategy.Normal);
      Assert.IsTrue(0 < products.Count);
    }

    private IList<ModelB.Product> GetCategoryProductsGivenQueryStrategy(QueryStrategy strategy) {
      var category = ModelBScenarios.GetBeverageCategory(_manager);
      _manager.DefaultQueryStrategy = strategy;
      return category.Products;
    }

Edited by WardBell - 13-Nov-2009 at 9:49am