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CHAPTER 4 s DATA ACCESS AND SECURITY
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Finally, the newly created object is wrapped in a Csla.Server.DataPortalResult object and returned: Return New DataPortalResult(obj) 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 End Try 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 " & _ My.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 that 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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The Fetch() method follows the same basic flow as Create(). The primary difference is in how the business object is created. Where Create() is passed the type of the business object as a parameter, Fetch() calls a CreateBusinessObject() helper method: obj = CreateBusinessObject(criteria) This helper method examines the criteria object to determine the type of business object to be created: Private Shared Function CreateBusinessObject( _ ByVal criteria As Object) As Object Dim businessType As Type If criteria.GetType.IsSubclassOf(GetType(CriteriaBase)) Then ' get the type of the actual business object ' from CriteriaBase businessType = CType(criteria, CriteriaBase).ObjectType
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CHAPTER 4 s DATA ACCESS AND SECURITY
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Else ' get the type of the actual business object ' based on the nested class scheme in the book businessType = criteria.GetType.DeclaringType End If ' create an instance of the business object Return Activator.CreateInstance(businessType, True) End Function If the criteria object inherits from Csla.CriteriaBase, then the ObjectType property is used to get the business object type. Otherwise, it is assumed that the criteria object s class is nested within the business class, and so the DeclaringType property is used to determine the business class. In either case, Activator.CreateInstance() is used to create an instance of the business object, just as it was in the Create() method. Once the object s data is loaded using the DataPortal_Fetch() method, the MarkOld() method is invoked to ensure that IsNew and IsDirty are both False.
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The Update() method is more complex. Remember that the Update() process adapts itself to the type of business object being updated, so it checks to see if the object is a subclass of BusinessBase or CommandBase and behaves appropriately. Also recall that the actual business object is passed as a parameter to Update(), so this method doesn t need to create an instance of the business object at all.
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It starts right out by checking to see if the business object is a subclass of BusinessBase. If the object is a subclass, then it is casted to type Csla.Core.BusinessBase so that the object s state can easily be checked: If TypeOf obj Is Core.BusinessBase Then Dim busObj As Core.BusinessBase = DirectCast(obj, Core.BusinessBase) If busObj.IsDeleted Then If Not busObj.IsNew Then ' tell the object to delete itself MethodCaller.CallMethod(busObj, "DataPortal_DeleteSelf") End If ' mark the object as new MethodCaller.CallMethodIfImplemented(busObj, "MarkNew") Else If busObj.IsNew Then ' tell the object to insert itself MethodCaller.CallMethod(busObj, "DataPortal_Insert") Else ' tell the object to update itself MethodCaller.CallMethod(busObj, "DataPortal_Update") End If ' mark the object as old MethodCaller.CallMethodIfImplemented(busObj, "MarkOld") End If
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