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It isn t just a matter of sending the data to the server to be stored but also a matter of returning the object from the server after the update has completed so that the UI has a current, valid version of the object Because of the way NET passes objects by value, it may introduce a bit of a wrinkle into the overall process When passing the object to be saved over to the server, NET makes a copy of the object from the client onto the server, which is exactly what is desired However, after the update is complete, the object must be returned to the client When an object is returned from the server to the client, a new copy of the object is made on the client, which isn t really the desired behavior Figure 2-18 illustrates the initial part of the update process..

while (vm.step(row)) { System.err.println(row.print()); }

WSE 3.0 ships with a useful utility called the X.509 Certificate Tool. You can use this tool for several purposes: Browse installed certificates in the Current User and Local Computer certificate stores. Set permissions on the keys in the MachineKeys folder, which provides access to Local Computer certificates. Retrieve the base64 key identifier for installed certificate keys. Figure 5-5 shows the X.509 Certificate Tool with a selected certificate, which in this case is the private key certificate for the Local Computer user.

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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; 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.

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Figure 2-19. Data portal returning the inserted or updated business object to the UI 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. Once the update is done, the new version of the business object is returned to the UI. The UI can then continue to interact with the new business object as needed.

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