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The final functionality required is support for data access. As with all business objects, the data portal will be used to invoke an appropriate DataPortal_XYZ method. Since this base class only supports read-only lists, only the DataPortal_Fetch() method is marked as Protected: Protected Overridable Sub DataPortal_Fetch(ByVal criteria As Object) Throw New NotSupportedException(My.Resources.FetchNotSupportedException) End Sub This is comparable to the functionality added to BusinessBase or ReadOnlyBase in 4. The business developer must override or overload this method to implement the data access code that loads the name/value data from the database. As with the other CSLA .NET base classes, the DataPortal_OnDataPortalInvoke(), DataPortal_ OnDataPortalInvokeComplete(), and DataPortal_OnDataPortalException() methods are also declared as Protected and Overridable. The primary difference from the base class code added in 4 is that NameValueListBase also includes a Protected criteria class:

We can see this parent/child process creation clearly on UNIX when we run the client and server on the same machine: ops$tkyte@ORA10G> select a.spid dedicated_server, 2 b.process clientpid 3 from v$process a, v$session b 4 where a.addr = b.paddr 5 and b.sid = (select sid from v$mystat where rownum=1) 6 / DEDICATED_SE CLIENTPID ------------ -----------5114 5112 ops$tkyte@ORA10G> !/bin/ps PID TTY STAT TIME 5112 pts/1 R 0:00 5114 S 0:00 -p 5114 5112 COMMAND sqlplus oracleora10g (DESCRIPTION=(LOCAL=YES)..(PROTOCOL=beq)))

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When running the application in Listing 5-23 on the BatterySampleEmulator emulator, the following output will be produced: *** Battery Info *** State of Charge: 35% Is fully charged: Yes Voltage: 5.123 Volt Temperature: 23.4 Celsius On Charger: Yes *** Charger Model *** Charge Min: 10% Charge Low: 20% Charge Medium: 30% Charge Full Min: 60% Charge Full: 98% Charge Hysteresis: 6 ms Timeout Charging: 30 min Timeout Charged: 10 min Timeout Charger: 5 sec Timeout Backlight: 5 sec

<Serializable()> _ Protected Class Criteria Inherits CriteriaBase Public Sub New(ByVal collectionType As Type) MyBase.New(collectionType) End Sub End Class The Csla.DataPortal.Fetch() method requires a criteria object as a parameter. At a minimum, that criteria object must provide the data portal with the type of the business object to be created. Normally, the type can be determined by looking at the class within which the criteria class is nested, because that is the business class itself. But in this case, the criteria class is nested inside the base class rather than the business class itself, so that technique won t work. The data portal would end up trying to instantiate an instance of NameValueListBase rather than the actual business class. This problem can be avoided because the Criteria class is a subclass of Csla.CriteriaBase. Remember that in 4 the data portal was designed to use CriteriaBase to find the specific type of business object to be created. The Criteria class has a constructor that requires the business developer to provide the type of the name/value list object to be created. In the following PaymentTerms example, the factory method uses this constructor when creating the Criteria object: Public Shared Function GetList() As PaymentTerms Return DataPortal.Fetch(Of PaymentTerms)( _ New Criteria(GetType(PaymentTerms))) End Function This ensures that the data portal knows that it is a PaymentTerms object that is to be created. This Criteria class works for the common case in which the entire set of name/value data is to be retrieved.

Here, I used a query to discover the process ID (PID) associated with my dedicated server (the SPID from V$PROCESS is the operating system PID of the process that was being used during the execution of that query).

Let s now take a look at the shared server process in more detail. This type of connection mandates the use of Oracle Net even if the client and server are on the same machine you cannot use shared server without using the Oracle TNS listener. As described earlier, the client application will connect to the Oracle TNS listener and will be redirected or handed off to a dispatcher. The dispatcher acts as the conduit between the client application and the shared server process. Figure 5-2 is a diagram of the architecture of a shared server connection to the database.

If the business developer needs to retrieve a filtered list, he ll need to declare his own criteria class within his business class; just as for any other root business object.

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