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Note that the DataPortal_XYZ methods are responsible not only for saving the object s data, but also for starting the process of saving all the child object data. Calling the data portal does not save child objects; they are saved because their root parent object directly calls internal-scoped Insert(), Update(), or DeleteSelf() methods on each child collection or object, thereby causing them to save their data.

The reason this snapshot process is so complex is that the values of all fields in each object must be copied, and each business object is essentially composed of several classes all merged together through inheritance and aggregation. This causes problems when classes have fields with the same names as fields in the classes they inherit from, and it causes particular problems if a class inherits from another class in a different assembly. Since UndoableBase is a base class from which BusinessBase will ultimately derive, it must be marked as Serializable. It is also declared as abstract, so that no one can create an instance of this class directly. All business objects need to utilize the INotifyPropertyChanged interface implemented in BindableBase so they inherit from that, too. Finally, the n-level undo functionality relies on the IUndoableObject interface from the Csla.Core namespace, so that is implemented in this class (and in BusinessListBase, discussed later in its own section): [Serializable] public abstract class UndoableBase : Csla.Core.BindableBase, Csla.Core.IUndoableObject { } With that base laid down, I can start to discuss how to implement the undo functionality. There are three operations involved: taking a snapshot of the object state, restoring the object state in case of an undo, and discarding the stored object state in case of an accept operation. Additionally, if this object has child objects that implement IUndoableObject, those child objects must also perform the store, restore, and accept operations. To achieve this, any time the algorithm encounters a field that s derived from either of these types, it cascades the operation to that object so it can take appropriate action.

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acm create scope -name:StringServiceScope -appliesto:http://localhost/processstring -tokenpolicyid:tp_4cb597317c2f42cba0407a91c2553324

Child objects are inserted, updated, or deleted as part of the process of updating a root parent object. To support this concept, child collections implement an internal method named Update(). Child objects within a collection implement internal methods, named Insert(), Update(), and DeleteSelf(), that can be called by the collection during the update process. It is helpful for related root, child, and child collection classes to be placed in the same project (assembly) so that they can use internal scope in this manner. The sequence of events to add, edit, or delete a child object is as follows: 1. The root object s DataPortal_XYZ method calls the child collection s Update() method; the parent object is passed as a parameter so that child objects can use root object property values as needed (such as for foreign key values). 2. The child collection s Update() method loops through all the deleted child objects in the collection, calling each deleted object s DeleteSelf() method. 3. The child collection s Update() method loops through all its active child objects, calling each child object s Insert() or Update() method based on the child object s IsNew property value. 4. At this point, all the child object data has been inserted, updated, or deleted as required.

When you re using the configuration browser, you won t need to provide the token policy ID you ll be able to choose it from the drop-down list. You can associate a policy to a namespace by creating a scope, as shown in figure 17.6. There are several advanced uses for scopes that we won t go into in this chapter. These include managing a large number of service endpoints with a few scopes, and chaining namespaces together for delegation.

5. From the perspective of the child collection object, just one method is called, as follows: Update() 6. From the perspective of each child object, one of three methods is called, as follows: Insert() Update() DeleteSelf() Figure 7-7 illustrates this process. Remember that this diagram is connected with the previous diagram showing the update of a root object. The events depicted in this diagram occur as a result of the root object s DataPortal_Insert() or DataPortal_Update() being called, as shown earlier in Figure 7-6.

The three operations are implemented by a set of three methods: CopyState() UndoChanges() AcceptChanges()

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