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Figure 17.6 It s easy to create a scope. A scope acts as a container for a set of rules for your service. It also associates a token policy with the service. You ll need to define the URI for the service the scope applies to.

The Insert() and Update() methods often accept parameters. Typically, the root object s primary key value is a required piece of data when saving a child object (since it would be a foreign key in the table), and so a reference to the root object is typically passed as a parameter to the collection s Update() method, and then to each child object s Insert() or Update() method. Passing a reference to the root object is better than passing any specific property value, because it helps to decouple the root object from the child object. Using a reference means that the root object doesn t know or care what actual data is required by the child object during the update process that information is encapsulated within the child class. Also, when implementing transactions manually using ADO.NET, rather than System. Transactions or Enterprise Services, the ADO.NET transaction object will also need to be passed as a parameter, so that each child object can update its data within the same transaction as the root object.

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The CopyState() method takes a snapshot of the object s current data and stores it in a Stack object.

Figure 17.7 Creating a rule to insert a claim that includes the customer s customerid. In this case, you re relying on the issuer of the inbound request to know which customer it is. RULES

In most cases, the use of System.Transactions will provide the best trade-off between performance and simplicity of data access code.

Rules are the heart of the ACS system. When a token is created by ACS, the rules for the related scope are executed. This is the process that allows you to transform the consumer s request into something your application can act on. Rules can also be used to create claims out of thin air, and put them in the resulting token. For example, suppose you wanted to place a claim in the token that represents the consumer s customerid, to make it easier for your service to identify the account the request is related to. You could create a rule that says, If this is for issuer MaineReversal, add a claim called customerid with a value of 31415. Figure 17.7 shows how you could create this rule. Another rule you could use would assign a new role value based on mappings you ve worked out with the customer. Perhaps their system tracks their users with a role of ServiceManager this would be a group the user belongs to at Maine Reversal. Your system doesn t know that role name, and you don t want to add all of your customers role types to your system that would get very complex very quickly. The rule in figure 17.8 creates the roles claim with the manager value.

While child objects are deleted within the context of the root object that s being updated, deletion of root objects is a bit different. Recall that the data portal was implemented to support both immediate and deferred deletion of a root object.

Since UndoableBase is an implementation of n-level undo capability, each object could end up storing a number of snapshots. As each undo or accept operation occurs, it gets rid of the most recently stored snapshot; this is the classic behavior of a stack data structure. Fortunately, the .NET Framework includes a prebuilt Stack<T> class that implements the required functionality. It is declared as follows: [NotUndoable] private Stack<byte[]> _stateStack = new Stack<byte[]>(); This field is marked as NotUndoable to prevent taking a snapshot of previous snapshots. CopyState() should just record the fields that contain actual business data. Once a snapshot has been taken of the object s data, the snapshot is serialized into a single byte stream. That byte stream is then put on the stack. From there, it can be retrieved and deserialized to perform an undo operation if needed.

Figure 17.8 Creating a rule that substitutes the inbound roles claim for a new one. Using this rule, you can map the ServiceManager role value that your system doesn t know to one your system does know manager.

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