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The service interface has the following properties: It supports the communication requirements that the service specifies in its WSDL contract (specifically, in its binding information) This includes the format and transport protocols that the service responds to (eg, SOAP over HTTP) It supports the security requirements that the service specifies In NET terms, the asmx code-behind can implement code that verifies incoming XML messages to ensure that they contain the required security tokens or headers It supports the methods (operations) that the service specifies in its WSDL contract In NET terms, the asmx file provides methods that correspond to the service operations, but the actual business processing should be handed off to dedicated components and workflow Figure 1-3 also shows that there are two categories of service consumers that have entry points into the business layer.

This approach means that all the child objects are handled as a single unit in terms of data access. They are loaded into the collection to start with, so the user can interact with all of them and then save them as a batch when all edits are complete. This is only subtly different from having a regular root object that has a collection of child objects. Figure 5-1 shows the regular root object approach on the left and the collection root object approach on the right.

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Figure 5-1. Comparing simple root objects (left) and collection root objects (right) This approach isn t recommended when there are large numbers of potential child objects, because the retrieval process can become too slow. However, it can be useful in cases where you can specify criteria to limit the number of objects returned. To create an editable root collection object, use a template like this: <Serializable()> _ Public Class EditableRootList Inherits BusinessListBase(Of EditableRootList, EditableChild) #Region "Authorization Rules" Private Shared Sub AddObjectAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowGet(GetType(EditableRootList), "Role") End Sub #End Region #Region "Factory Methods" Public Shared Function NewEditableRootList() As EditableRootList Return DataPortal.Create(Of EditableRootList)() End Function Public Shared Function GetEditableRootList( _ ByVal id As Integer) As EditableRootList Return DataPortal.Fetch(Of EditableRootList)(New _ SingleCriteria(Of EditableRootList, Integer)(id)) End Function Private Sub New() ' Require use of factory methods End Sub

The first is a traditional user interface, shown on the left of the diagram, such as a Windows form or an ASP NET web page This type of user interface is part of the same domain where the service components reside The second category of front-end consumers is the external Web service clients and other services, shown at the top of the diagram These two categories are well-known to developers If you develop a Web service for external use, you can just as easily call it internally within its application domain Of course, it is more efficient to call the Web service s delegated business components, because when you are internal to the domain, you do not need to route requests through the asmx gateway using special transport and messaging protocols (eg, HTTP and SOAP).

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#End Region #Region "Data Access" Private Sub DataPortal_Fetch(ByVal criteria _ As SingleCriteria(Of EditableRootList, Integer)) RaiseListChangedEvents = False ' TODO: load values into memory Dim childData As Object = Nothing For Each item In DirectCast(childData, List(Of Object)) MeAdd(EditableChildGetEditableChild(item)) Next RaiseListChangedEvents = True End Sub #End Region End Class The Authorization Rules region implements the AddObjectAuthorizationRules() method to define the roles that can interact with the object This is the same as with an editable root object, and the UI developer can use this information to enable and disable UI elements accordingly Also, the data portal uses these rules to ensure only authorized users are able to create, get, edit, or delete the collection object The one difference is that this AddObjectAuthorizationRules() method only needs to define the roles allowed to get the object The Factory Methods region implements factory methods to create, retrieve, and (optionally) delete the collection.

The methods rely on the data portal to do much of the work, ultimately delegating the call to the appropriate DataPortal_XYZ method In the Data Access region, the DataPortal_Fetch() method is responsible for getting the data from the database using whatever data access technology you choose This is often LINQ to SQL, the ADONET Entity Framework, or raw ADONET In any case, the Data Access layer must return the child data as a result so it can use it to load each individual child object with data You load each child object by calling the child object s factory method, passing the object s data as a parameter The resulting child object is added to the collection The DataPortal_Fetch() method sets the RaiseListChanged Events property to False before changing the collection and then restores it to True once the operation is complete.

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