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CHAPTER 2 FRAMEWORK DE SIGN
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Figure 2-15. Routing calls through transactional wrappers
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Object Factory Model
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By default, the server-side data portal components route calls to methods of an instance of the business object itself. In other words, the business object becomes responsible for initializing itself with new data, loading itself with existing data, and inserting, updating, or deleting its data. That approach is very simple and efficient but may not offer the best separation between business and data access logic. The ObjectFactory attribute and ObjectFactory base class provide an alternative, where the data portal creates an instance of an object factory class and interacts with that factory object, instead of the business object. In the default model, the data portal does a lot of work on behalf of the business developer. It creates instances of the business object, manages the object s state values, and generally shepherds the object through the data persistence process. In the object factory model, the data portal leaves all those details to the factory object, which is created by the business developer. The result is that the business developer has a lot of flexibility but assumes a lot more responsibility. If the business developer doesn t properly manage the business object s state, other areas of CSLA .NET (such as data binding or n-level undo) may not function correctly. I discuss the details around object factories in s 4 and 5 and the underlying implementation in 15.
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Data Portal Behaviors
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Now that you have a grasp of the areas of functionality required to implement the data portal concept, let s discuss the specific data behaviors the data portal will support. The behaviors were listed earlier in Table 2-5.
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The create operation is intended to allow the business objects to load themselves with values that must come from the database. Business objects don t need to support or use this capability, but if they do need to initialize default values, this is the mechanism to use.
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C HAPTE R 2 FRA MEWORK DES IGN
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There are many types of applications for which this is important. For instance, order entry applications typically have extensive defaulting of values based on the customer. Inventory management applications often have many default values for specific parts, based on the product family to which the part belongs. Medical records also often have defaults based on the patient and physician involved. When the Create() method of the DataPortal is invoked, it s passed a criteria object. As I ve explained, the data portal will either use reflection against the criteria object or will rely on the type information in CriteriaBase to determine the type of business object to be created. Using that information, the data portal uses reflection to create an instance of the business object itself. However, this is a bit tricky because all business objects have private or protected constructors to prevent direct creation by code in the UI: [Serializable] public class Employee : BusinessBase<Employee> { private Employee() { /* prevent direct creation */ } } Business objects will expose static factory methods to allow the UI code to create or retrieve objects. Those factory methods will invoke the client-side DataPortal. (I discuss this class-in-charge concept earlier in the chapter.) As an example, an Employee class may have a static factory method, such as the following: public static Employee NewEmployee() { return DataPortal.Create<Employee>(); } Notice that no Employee object is created on the client here. Instead, the factory method asks the client-side DataPortal for the Employee object. The client-side DataPortal passes the call to the serverside data portal. If the data portal is configured to run remotely, the business object is created on the server; otherwise, the business object is created locally on the client. Even though the business class has only a private constructor, the server-side data portal uses reflection to create an instance of the class. The alternative is to make the constructor public, in which case the UI developer will need to learn and remember that they must use the static factory methods to create the object. Making the constructor private provides a clear and direct reminder that the UI developer must use the static factory method, thus reducing the complexity of the interface for the UI developer. Keep in mind that not implementing the default constructor won t work either, because in that case, the compiler provides a public default constructor on your behalf. Once the server-side data portal has created the business object, it calls the business object s DataPortal_Create() method, optionally passing a criteria object as a parameter. At this point, code inside the business object is executing, so the business object can do any initialization that s appropriate for a new object. Typically, this will involve going to the database to retrieve any configurable default values. When the business object is done loading its defaults, the server-side data portal returns the fully created business object back to the client-side DataPortal. If the two are running on the same machine, this is a simple object reference; but if they re configured to run on separate machines, the business object is serialized across the network to the client (i.e., it s passed by value), so the client machine ends up with a local copy of the business object. The UML sequence diagram in Figure 2-16 illustrates this process.
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