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Figure 2-18. Sending a business object to the data portal to be inserted or updated The UI has a reference to the business object and calls its Save() method. This causes the business object to ask the data portal to save the object. The result is that a copy of the business object is made on the server, where it can save itself to the database. So far, this is pretty straightforward. The business object has a Save() method, but the data portal infrastructure has methods named Update(). Although this is a bit inconsistent, remember that the business object is being called by UI developers; and I ve found that it s more intuitive for the typical UI developer to call Save() than Update(), especially since the Save() call can trigger an Insert, Update, or even Delete operation. However, once this part is done, the updated business object is returned to the client and the UI must update its references to use the newly updated object instead, as shown in Figure 2-19. This is fine, too but it s important to keep in mind that you can t continue to use the old business object; you must update all object references to use the newly updated object. Figure 2-20 is a UML sequence diagram that shows the overall update process. You can see that the UI calls the Save() or BeginSave() method on the business object, which results in a call to the client-side DataPortal s Update() method, passing the business object as a parameter. As usual, the client-side DataPortal determines whether the server-side data portal is running locally or remotely and then delegates the call to the server-side data portal. The server-side data portal then simply calls the DataPortal_Update() method on the business object so that the object can save its data into the database. DataPortal_Insert() would be called if the object is a new object; DataPortal_DeleteSelf() would be called if the object is marked for deletion. These methods may implement the code to insert, update, or delete the object directly within the business class, or they may delegate the call to a persistence object in another assembly. At this point, two versions of the business object exist: the original version on the client and the newly updated version on the application server. However, the best way to view this is to think of the original object as being obsolete and invalid at this point. Only the newly updated version of the object is valid.
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STL has a variety of objects that represent functions, often called functors. Functors are also available in STL/CLR. Unlike STL functors, STL/CLR functors also support an implicit conversion to a delegate type, so a functor can be used wherever a delegate is expected. The code in Listing 12-25 uses the less functor with an integer argument. The less functor is a template that takes two arguments of the same type and returns a Boolean value. Listing 12-25. Using a Functor // stlclr_functor.cpp #include <cliext\functional> using namespace cliext; using namespace System;
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Indicating Which Part You re Going to Extend The document already contains a sample ContentProcessor. Replace it with the following code, and indicate the specific input and output of your new processor. All this custom processor does is ask its base class (the default texture processor) to process its input, so this new ContentProcessor will behave the same way as the default texture processor. namespace MyImagePipeline { [ContentProcessor(DisplayName = "ExtendedExample")] public class ExtentedTextureProcessor : TextureProcessor { public override TextureContent Process(TextureContent input, ContentProcessorContext context) { return base.Process(input, context); } } } In this recipe, you re going to extend the default TextureProcessor, so you need to inherit from the TextureProcessor class. Because of this, your Process method receives a TextureContent object and is supposed to produce a TextureContent object as output. In a few minutes, you ll be coding a real Process method for your custom processor; for now it passes only the input it receives to the base class, being the default TextureProcessor.
Note Classes are encapsulated sets of logically related data items and functions that generally represent objects in the real world or a conceptual world.
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