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The Data Access region contains the DataPortal_XYZ or Child_XYZ methods, unless you use the ObjectFactory attribute, in which case any code that would have been in the DataPortal_XYZ methods is in a separate object factory class. Your business objects may require other code that doesn t fit neatly into these regions, and you should feel free to add extra regions if needed. But these regions cover the vast majority of code required by typical business objects, and in most cases they re all you ll need.
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Object Factory Classes
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Any root business object can specify an ObjectFactory attribute, which causes the data portal to change its behavior. Rather than directly interacting with the business object, the data portal creates an instance of an object factory class and it interacts with that factory object. Applying the ObjectFactory attribute is straightforward: [ObjectFactory("Factories.MyFactory,Factories")] [Serializable] public class MyBusinessClass : Csla.baseclass<MyBusinessClass> The parameter passed to the attribute is an assembly-qualified type name for the object factory class. An instance of this class is created by the data portal.
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It is possible to provide an object factory loader, which is a class you implement to create the factory object. If you do this, your object factory loader can interpret the string parameter to ObjectFactory in any way you choose. Use the CslaObjectFactoryLoader configuration setting in appSettings to specify the assemblyqualified type of your object factory loader, which must implement Csla.Server.IObjectFactoryLoader. The default object factory loader is Csla.Server.ObjectFactoryLoader.
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You may also specify, as string values, the names of the create, fetch, update, and delete methods that should be invoked on the factory object. By default, the data portal invokes methods named Create(), Fetch(), Update() and Delete(), which must be implemented in the object factory class. An object factory class looks like this: public class MyFactory : Csla.Server.ObjectFactory { public object Create() { } public object Fetch(SingleCriteria<MyBusinessClass, int> criteria) { } public object Update(object obj) { } public void Delete(SingleCriteria<MyBusinessClass, int> criteria) { } } As with the DataPortal_Create(), DataPortal_Fetch(), and DataPortal_Delete() methods, you may implement multiple overloads of the Create(), Fetch(), and Delete() methods, and the data
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CHAPTER 4 CSLA . NET OBJECT STEREOTYPES
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portal will invoke the correct overload based on the parameters provided when the data portal is first called. Inheriting from the ObjectFactory base class is optional but useful. The factory object is responsible for creating and manipulating the business object, including managing the business object s state values as I discuss in 18. The ObjectFactory base class provides the protected methods listed in Table 4-3 to assist in this process.
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Table 4-3. Protected Methods Supplied by ObjectFactory
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Method
MarkNew() MarkOld() MarkAsChild()
Description
Marks the business object as being a new object Marks the business object as being an old (preexisting) object Marks the business object as a child object
See 7 for a detailed discussion of these terms and concepts. For now you should understand that inheriting from ObjectFactory makes these methods available, and if you choose not to inherit from ObjectFactory, you ll have to develop your own mechanism for managing the states of your business objects.
Non-public Default Constructor
All business objects will be implemented to make use of the class-in-charge scheme discussed in 1. Factory methods are used in lieu of the new keyword, which means that it s best to prevent the use of new, thereby forcing the UI developer to use the factory methods instead. The data portal mechanism requires business classes to include a default constructor. As I reviewed the create, fetch, update, and delete processes for each type of object earlier in this chapter, each sequence diagram showed how the server-side data portal created an instance of the business object. This is done using a technique that requires a default constructor. By making the default constructor private or protected (and by not creating other public constructors), you ensure that UI code must use the factory methods to get an instance of any object: // ... #region Factory Methods private MyBusinessClass() { /* require use of factory methods */ } #endregion // ... This constructor both prevents the new keyword from being called by code outside this class and provides the data portal with the ability to create the object via reflection. Your classes might also include other non-public constructors, but this one is required for all objects.
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