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Whether editable or read-only, all root objects go through the same basic creation process. (Root objects are those that can be directly retrieved from the database, while child objects are retrieved within the context of a root object, though never directly.) It s up to the root object to invoke methods on its child objects and child collections so that they can load their own data from the database. Usually, the root object actually calls the database and gets all the data back and then provides that data to the child objects and collections so that they can populate themselves. From a purely object-oriented perspective, it might be ideal to have each object encapsulate the logic to get its own data from the database, but in reality it s not practical to have each object independently contact the database to retrieve one row of data.
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CHAPTER 4 CSLA . NET OBJECT STEREOTYPES
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Root objects are created by calling a factory method, which is a method that s called in order to create an object. Factory methods will typically be static methods on the class. The factory method uses the CSLA .NET data portal to load the object with default values. The data portal is a CSLA .NET technology that abstracts communication with the application server (if there is one), enabling the mobile object concept described in 1. I am often asked why you would need to communicate with the database to create a new object. Why not just use the constructor and be done with it The reason is that business applications often need to load new objects with default values, and those values are often in database tables. While some simple objects can be directly created, it is quite common for an object to require data from the database as it is created. The following steps outline the process of creating a new root object: 1. The factory method is called. 2. The factory method calls DataPortal.Create() to get the business object. 3. The data portal uses its channel adapter and message router functionality as described in 15; the result is that the data portal creates a new instance of the business object. 4. The data portal does one of the following: a. If no ObjectFactory attribute is specified, the DataPortal_Create() method is called and this is where the business object implements data access code to load its default values. b. If an ObjectFactory is specified, the data portal will create an instance of a factory object and will invoke a specified create method on that factory object. This method is responsible for creating an instance of the business object and implementing data access code to load its default values. 5. The business object is returned. With no ObjectFactory attribute, from the business object s perspective, two methods are called, as follows: The default constructor DataPortal_Create() This is illustrated in Figure 4-5. If the object doesn t need to retrieve default values from the database, the RunLocal attribute can be used to short-circuit the data portal so the object initialization occurs in the same location as the calling code. If an object doesn t require any initialization, the DataPortal_Create() method doesn t need to be overridden. The CSLA .NET base classes provide a default implementation decorated with RunLocal. With an ObjectFactory attribute, the business developer will have defined two classes: the object factory class and the business class. From the object factory s perspective, two methods are called, as follows: The default constructor The create method specified by the ObjectFactory attribute As illustrated in Figure 4-6, it is then entirely up to the object factory to create and initialize the business object.
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