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If this method were defined by CSLA .NET, it couldn t use the MyCriteria type because that type is specific to the business application. Instead, the framework would have to define the method using Object as the parameter type, as I did in CSLA .NET 1.0. In that case, a business developer must write code like this: Protected Overrides Sub DataPortal_Fetch(ByVal criteria As Object) MyCriteria crit = CType(criteria, MyCriteria) ' load data into object from database End Sub For the purposes of backward compatibility, the implementation in this chapter will support both the old and new strongly typed models. To support the old model, the base classes in the framework need to include Protected Overridable methods with default behaviors for the key DataPortal_XYZ methods that a business developer might override. For those methods that aren t appropriate for a given base class, Private methods are implemented in the base class that throw an exception. For example, Csla.Core.BusinessBase includes the following code: Protected Overridable Sub DataPortal_Create(ByVal criteria As Object) Throw New NotSupportedException( _ My.Resources.CreateNotSupportedException) End Sub This provides a base method definition that a business class can override. The Visual Studio 2005 IDE makes it very easy to override methods by simply typing the keyword Overrides into the editor and getting an IntelliSense list of the Overridable methods in the base class. Notice that the default implementation throws an exception. If the business developer doesn t override this method (or provide a strongly typed equivalent), but does implement a factory method that calls DataPortal.Create(), this exception will be the result.

Listing 5-25. Using the Cpu Class using System; using Microsoft.SPOT; using Microsoft.SPOT.Hardware; namespace CpuSample { public class Program { public static void Main() { Cpu.GlitchFilterTime = new TimeSpan(0, 0, 0, 0, 100); //100 ms float systemClock = Cpu.SystemClock / 1000000.0f; Debug.Print("System Clock: " + systemClock.ToString("F6") + " MHz"); float slowClock = Cpu.SlowClock / 1000000.0f; Debug.Print("Slow Clock: " + slowClock.ToString("F6") + " MHz"); float glitchFilterTimeMs = Cpu.GlitchFilterTime.Ticks / (float)TimeSpan.TicksPerMillisecond; Debug.Print("Glitch Filter Time: " + glitchFilterTimeMs.ToString("F1") + " ms"); } } }

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Statistics ---------------------------------------------------------0 recursive calls 0 db block gets 0 consistent gets 0 physical reads 0 redo size 756 bytes sent via SQL*Net to client 508 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 2 rows processed ops$tkyte@ORA10G> set autotrace off In doing so, we now have two sessions, but both are using the same single dedicated server process, as evidenced by them both having the same PADDR value We can confirm in the operating system that no new processes were created and that we are using a single process a single connection for both sessions Note that one of the sessions (the original session) is ACTIVE That makes sense: it is running the query to show this information, so of course it is active But that INACTIVE session what is that one for That is the AUTOTRACE session.

s Notice the use of a string resource rather than a literal string for the exception s message. This is done to Tip enable localization. Since the text value comes from the resource (resx) file for the project, it will automatically attempt to use the resources for the current culture on the executing thread.

Its job is to watch our real session and report on what it does When we enable AUTOTRACE in SQL*Plus, SQL*Plus will perform the following actions when we execute DML operations (INSERT, UPDATE, DELETE, SELECT, and MERGE): 1 It will create a new session using the current connection, if the secondary session does not already exist 2 It will ask this new session to query the V$SESSTAT view to remember the initial statistics values for the session in which we will run the DML This is very similar to the function the watch_statsql script performed for us in 4 3 It will run the DML operation in the original session 4 Upon completion of that DML statement, SQL*Plus will request the other session to query V$SESSTAT again and produce the report displayed previously showing the difference in the statistics for the session that executed the DML.

The same thing is done for DataPortal_Fetch(), DataPortal_Insert(), DataPortal_Update(), DataPortal_DeleteSelf(), and DataPortal_Delete(). Since a subclass of BusinessBase is an editable object, all the data portal operations are valid. Likewise, the same default methods are implemented in BusinessListBase. Again, it is the base for editable collections, and so all operations are valid. Csla.ReadOnlyBase and Csla.ReadOnlyListBase are used to create read-only objects. As such, only the DataPortal.Fetch() operation is valid. This means that only DataPortal_Fetch() is implemented as a Protected Overridable default. All the other DataPortal_XYZ methods are implemented with Private scope, and they all throw exceptions if they are called. This ensures that read-only objects can only be retrieved never inserted, updated, or deleted. This completes the enhancements to the business object base classes that are required for the data portal to function. 5 will implement a couple more base classes, and they too will have comparable features. Now let s move on and implement the data portal itself, feature by feature. The data portal is designed to provide a set of core features, including

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