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CHAPTER 4 s DATA ACCESS AND SECURITY
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If it is not already loaded into memory, the .NET runtime will automatically load the assembly containing the business object class. This is handled automatically by Activator.CreateInstance(), following the normal assembly-loading process always used by .NET.
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To ensure .NET can find your business assembly, it must be in the same directory as the client application s
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.exe file, in the Bin directory. Alternatively, you may install the assembly into the .NET global assembly cache (GAC).
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The next step in the process is to tell the business object that it is about to be invoked by the data portal. This is done by calling the object s DataPortal_OnDataPortalInvoke() method: MethodCaller.CallMethodIfImplemented( obj, "DataPortal_OnDataPortalInvoke", new DataPortalEventArgs(context)); Notice the use of the CallMethodIfImplemented() method on the MethodCaller class. This method was discussed earlier in the chapter, and it invokes the named method if it exists on the object, but does not throw an exception if the method isn t there. This is a way of invoking methods that are considered optional on the business object. A business developer can implement this method to do any preprocessing prior to an actual DataPortal_XYZ method being called. And that s the very next step: MethodCaller.CallMethod( obj, "DataPortal_Create", criteria); This isn t optional, so MethodCaller.CallMethod() is used. If it doesn t find a matching method, it will throw an exception. Recall that it tries to invoke a method that has a strongly typed parameter matching the type of the criteria object; otherwise, it will invoke one with a parameter of type object. Since the Create() method is creating a new object, the business object s MarkNew() method is invoked to ensure that the object s status is set to being new and dirty: MethodCaller.CallMethodIfImplemented( obj, "MarkNew"); Though the MarkNew() method is implemented by Csla.Core.BusinessBase, it isn t implemented by Csla.BusinessListBase; thus, it is considered optional.
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Technically, the data portal can be used to interact with objects that don t inherit from a CSLA .NET base class. While I won t cover this in the book, any object that follows the criteria scheme and implements the appropriate DataPortal_XYZ methods can be used with the data portal. This is another reason that calling methods like MarkNew() is optional.
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Now that the DataPortal_Create() method has been invoked, the object is notified that the data portal processing is complete: MethodCaller.CallMethodIfImplemented( obj, "DataPortal_OnDataPortalInvokeComplete", new DataPortalEventArgs(context)); Finally, the newly created object is wrapped in a Csla.Server.DataPortalResult object and returned: return new DataPortalResult(obj);
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CHAPTER 4 s DATA ACCESS AND SECURITY
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That concludes the normal sequence of events in the method. Of course, it is possible that an exception occurred during the processing. In that case, the exception is caught and the object is notified that an exception occurred: try { // tell the business object there was an exception MethodCaller.CallMethodIfImplemented( obj, "DataPortal_OnDataPortalException", new DataPortalEventArgs(context), ex); } catch { // ignore exceptions from the exception handler } This optional call to DataPortal_OnDataPortalException() is wrapped in its own try catch statement. Even if an exception occurs while calling this method, the code needs to continue. There s very little that could be done if the exception handling code has an exception, so such an exception is simply ignored. In any case, the exception is wrapped in a Csla.Server.DataPortalException, which is thrown back to Csla.DataPortal: throw new DataPortalException( "DataPortal.Create " + Resources.FailedOnServer, ex, new DataPortalResult(obj)); Remember that DataPortalException contains the original exception as an InnerException, and also traps the stack trace from the server exception so it is available on the client. Also keep in mind that all the proxy/host channel implementations ensure that the exception is returned to the client with full fidelity, so Csla.DataPortal gets the full exception detail regardless of the network channel used. At this point, you should understand how the flow of the data methods is implemented. The remaining methods follow the same flow with minor variations.
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