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The exception to this is when using Windows integrated (AD) security. In that case, you must configure the server technology (such as IIS) to use Windows impersonation or the server will not impersonate the user identity from the client.
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There are two possible outcomes of the server-side processing. Either it succeeds or it throws an exception. If the call to the business object succeeds, Csla.Server.DataPortal returns a DataPortalResult object back to Csla.DataPortal on the client. The DataPortalResult object contains the information listed in Table 4-7. Table 4-7. Context Data Contained Within DataPortalResult
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GlobalContext ReturnObject
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Collection of context data that flows from client to server and then from server back to client; changes on either end are carried across the network The business object being returned from the server to the client as a result of the data portal operation
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Csla.DataPortal puts the GlobalContext data from DataPortalResult into the client s Csla. ApplicationContext, thus ensuring that any changes to that collection on the server are reflected on the client. It then returns the ReturnObject value as the result of the call itself. You may use the bidirectional transfer of GlobalContext data to generate a consolidated list of debugging or logging information from the client, to the server, and back again to the client. On the other hand, if an exception occurs on the server, either within the data portal itself, or more likely within the business object s code, that exception must be returned to the client. Either the business object or the UI on the client can use the exception information to deal with the exception in an appropriate manner. In some cases, it can be useful to know the exact state of the business object graph on the server when the exception occurred. To this end, the object graph is also returned in the case of an exception. Keep in mind that it is returned as it was at the time of the exception, so the objects are often in an indeterminate state. If an exception occurs on the server, Csla.Server.DataPortal catches the exception and wraps it as an InnerException within a Csla.Server.DataPortalException object. This DataPortalException object contains the information listed in Table 4-8. Table 4-8. Context Data Contained Within Csla.Server.DataPortalException
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InnerException StackTrace DataPortalResult
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The actual server-side exception (which may also have InnerException objects of its own) The stack trace information for the server-side exception A DataPortalResult object (as discussed previously) containing both GlobalContext and the business object from the server
CHAPTER 4 s DATA ACCESS AND SECURITY
Again, Csla.DataPortal uses the information in the exception object to restore the Csla. ApplicationContext object s GlobalContext. And then it throws a Csla.DataPortalException, which is initialized with the data from the server. The Csla.DataPortalException object is designed for use by business object or UI code. It provides access to the business object as it was on the server at the time of the exception. It also overrides the StackTrace property to append the server-side stack trace to the client-side stack trace, so the result shows the entire stack trace from where the exception occurred on the server all the way back to the client code.
s Note Csla.DataPortal always throws a Csla.DataPortalException in case of failure. You must use either its InnerException or BusinessException properties, or the GetBaseException() method to retrieve the original exception that occurred.
In addition to Csla.DataPortal and Csla.Server.DataPortal, the types in Table 4-9 are required to implement the context behaviors discussed previously. Table 4-9. Types Required to Implement Context Passing and Location Transparency
Type
Csla.ApplicationContext Csla.DataPortalException
Description
Provides access to the ClientContext and GlobalContext collection objects, as well as other context information Exception thrown by the data portal in case of any serverside exceptions; the server-side exception is an InnerException within the DataPortalException Transfers context data from the client to the server on every data portal operation Transfers context and result data from the server to the client on every successful data portal operation Transfers context and exception data from the server to the client on every unsuccessful data portal operation
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