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CHAPTER 4 CSLA . NET OBJECT STEREOTYPES
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4. The DataPortal_Create() method is called and this is where the child object implements data access code to load its default values. 5. The child object must call MarkAsChild() in the DataPortal_Create() implementation to mark the object as a child. 6. The child object is returned. Again, the factory method is called by the collection object rather than the UI, but the rest of the process is the same as with a root object. 7. From the child object s perspective, two methods are called, as follows: The default constructor DataPortal_Create() This is illustrated in Figure 4-8.
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Figure 4-8. Creating a child object using data access Note that in either of these cases, the UI code is the same: it calls the Add() method on the parent object and then interacts with the parent s interface to get access to the newly added child object. The UI is entirely unaware of how the child object is created (and possibly loaded with default values). Also note that the parent object is unaware of the details. All it does is call the factory method on the child class and receive a new child object in return. All the details about how the child object got loaded with default values are encapsulated within the child class. Finally, as with creating a root object, the use of a criteria object is optional.
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Object Retrieval
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Retrieving an existing object from the database is similar to the process of creating an object that requires default values from the database. Only a root object can be retrieved from the database directly by code in the user interface. Child objects are retrieved along with their parent root object, not independently.
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CH A PT ER 4 C SLA .NET O BJECT S TER EOT YPES
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Root Object Retrieval
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To retrieve a root object, the UI code simply calls the static factory method on the class, providing the parameters that identify the object to be retrieved. The factory method calls DataPortal.Fetch(), which in turn creates the object and calls DataPortal_Fetch(), as follows: 1. The factory method is called. 2. The factory method calls DataPortal.Fetch() 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 business object can do basic initialization in the constructor method. 5. The data portal does one of the following: a. If no ObjectFactory attribute is specified, the DataPortal_Fetch() method is called; this is where the business object implements data access code to retrieve the object s data from the database. b. If an ObjectFactory is specified, the data portal will create an instance of a factory object and will invoke a specified fetch method on that factory object. This method is responsible for creating an instance of the business object and implementing data access code to load it with data from the database. 6. The business object is returned. If there is no ObjectFactory attribute on the business class, from the business object s perspective, two methods are called, as follows: The default constructor DataPortal_Fetch() Figure 4-9 illustrates the process.
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Figure 4-9. Retrieving an existing root object
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CHAPTER 4 CSLA . NET OBJECT STEREOTYPES
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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 fetch method specified by the ObjectFactory attribute As illustrated in Figure 4-10, it is then entirely up to the object factory to create an instance of the business class and to load it with data from the database.
Figure 4-10. Creating a root object with an object factory The RunLocal attribute can be applied to methods of an object factory and will have the same effect as it would on DataPortal_Fetch(), assuming the assembly containing the object factory class is deployed to the client workstation. It s important to note that the root object s DataPortal_Fetch() or factory object s fetch method is responsible not only for loading the business object s data but also for starting the process of loading the data for its child objects. The key thing to remember is that the data for the entire object, including its child objects, is retrieved when the root object is retrieved. This avoids having to go back across the network to retrieve each child object s data individually. Though the root object gets the data, it s up to each child object to populate itself based on that data. The exception to this is if you choose to use lazy loading to load a child object or collection later in the root object s lifetime. In that case you would not load the child in the root object s DataPortal_ Fetch() or factory object s fetch method. Instead you d leave the child field with a null value at this point. Let s dive one level deeper and discuss how child objects load their data.
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