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// Queue the button press to the input provider site. sink.Dispatcher.BeginInvoke(sink.callback, report); } } } } This GPIOButtonInputProvider class uses a button pad to associate the pins to buttons. By default, this class uses the pin configuration of the emulator. You need to associate the particular pins of your device as described in the device manual to buttons. The button pin associations for the emulator look like this: ButtonPad[] buttons = new ButtonPad[] { // Associate the buttons to the pins as setup // in the emulator/hardware new ButtonPad(this, Button.Left , Cpu.Pin.GPIO_Pin0), new ButtonPad(this, Button.Right , Cpu.Pin.GPIO_Pin1), new ButtonPad(this, Button.Up , Cpu.Pin.GPIO_Pin2), new ButtonPad(this, Button.Select, Cpu.Pin.GPIO_Pin3), new ButtonPad(this, Button.Down , Cpu.Pin.GPIO_Pin4), }; Your device might have more or fewer buttons on its surface than listed here; the buttons represented by the Button enumeration in Listing 11-35 are applicable. Listing 11-35. Possible Buttons namespace Microsoft.SPOT.Input { public enum Button { None = 0, Menu = 1, Select = 2, Up = 3, Down = 4, Left = 5, Right = 6, Play = 7, Pause = 8, FastForward = 9, Rewind = 10, Stop = 11, Back = 12, Last = 13, Home = 13, } }

Once DataPortal_Execute() is complete, the command object is returned to the client, thus allowing the object to report on its status. While OrderShipper doesn t do this, in 8 you ll see this concept used to implement Exists() commands. The Csla.CommandBase class itself is relatively straightforward. Like all CSLA .NET base classes, it is serializable and has a non-public constructor. It also implements the Csla.Core.ICommandObject interface to allow polymorphic comparisons in your code: <Serializable()> _ Public MustInherit Class CommandBase Implements Core.ICommandObject Protected Sub New() End Sub End Class Recall that in 4, all the framework base classes were enhanced to include default implementations of the DataPortal_XYZ methods: throwing exceptions if any of them were invoked. The same is true of CommandBase. All the DataPortal_XYZ methods are implemented as Private methods, except for DataPortal_Execute(), which is a Protected Overridable method: Protected Overridable Sub DataPortal_Execute() Throw New NotSupportedException(My.Resources.ExecuteNotSupportedException) End Sub Of course, the default implementation throws an exception in this method, too. The command object only has value if the business developer overrides this method in his business class. The DataPortal_OnDataPortalInvoke(), DataPortal_OnDataPortalInvokeComplete(), and DataPortal_OnDataPortalException() methods are also declared as Protected and Overridable.

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e ve reached the last piece of the architecture puzzle. We ve investigated the database and the set of physical files that constitute a database. In covering the memory used by Oracle, we ve looked at one half of an instance. The last remaining architectural issue to cover is the set of processes that constitute the other half of the instance. Each process in Oracle will perform a particular task or set of tasks, and each will have internal memory (PGA memory) allocated by it to perform its job. An Oracle instance has three broad classes of processes: Server processes: These perform work based on a client s request. We have already looked at dedicated and shared servers to some degree. These are the server processes. Background processes: These are the processes that start up with the database and perform various maintenance tasks, such as writing blocks to disk, maintaining the online redo log, cleaning up aborted processes, and so on. Slave processes: These are similar to background processes, but they are processes that perform extra work on behalf of either a background or a server process. Some of these processes, such as the database block writer (DBWn) and the log writer (LGWR), have cropped up already, but here we ll take a closer look at the function of each, and what each does and why.

Most business applications need to retrieve and display lists of name/value data. Commonly, this data is displayed in combo box or list controls, and is used to validate user entry to ensure the values are within the list. A common example is customer payment terms. Customers are required to pay invoices within a certain amount of time: net 30 for 30 days, net 60 for 60 days, COD for cash on delivery, and so forth. An application dealing with customer payments will almost certainly have a table in the database containing the list of valid payment terms. This list will be displayed to the user on various forms and pages, and is used to ensure that every Customer object s PaymentTerms property is one of the items in the list. It is quite practical to use the ReadOnlyListBase class from 3 to create your own name/value list. But this is such a common application requirement that it is better to create a more targeted base class to further minimize the code required to implement name/value lists. The Csla.NameValueListBase provides this targeted abstraction. A business developer can construct a name/value list like this: <Serializable()> _ Public Class PaymentTerms Inherits Csla.NameValueListBase(Of Integer, String) Private Sub New() ' require use of factory methods End Sub

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