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Assuming you have imported the SystemThreading namespace via the VB 2005 Imports keyword, your first step is to define a type method to perform the work of the (possible) secondary thread To keep focused on the mechanics of building multithreaded programs, this method will simply print out a sequence of numbers to the console window, pausing for approximately 2 seconds with each pass Here is the full definition of the Printer class: Public Class Printer Public Sub PrintNumbers() ' Display Thread info ConsoleWriteLine("-> {0} is executing PrintNumbers()", _ ThreadCurrentThreadName) ' Print out numbers ConsoleWrite("Your numbers: ") For i As Integer = 0 To 10 ConsoleWrite(i & ", ") ThreadSleep(2000) Next ConsoleWriteLine() End Sub End Class Now, within Main(), you will first prompt the user to determine whether one or two threads will be used to perform the application s work.

<source name="System.ServiceModel" switchValue="Warning, ActivityTracing" propagateActivity="true"> <listeners> <add type="System.Diagnostics.DefaultTraceListener" name="Default"> <filter type="" /> </add> <add name="ServiceModelTraceListener"> <filter type="" /> </add> </listeners> </source> </sources> <sharedListeners> <add initializeData="C:\Temp\App_messages.svclog" type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" name="ServiceModelMessageLoggingListener" traceOutputOptions="Timestamp"> <filter type="" /> </add> <add initializeData="C:\App_tracelog.svclog" type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" name="ServiceModelTraceListener" traceOutputOptions="Timestamp"> <filter type="" /> </add> </sharedListeners> </system.diagnostics> <system.serviceModel> <diagnostics> <messageLogging logEntireMessage="true" logMalformedMessages="true" logMessagesAtServiceLevel="true" logMessagesAtTransportLevel="true" /> </diagnostics> <services> <service behaviorConfiguration="tradeServiceBehavior" name="QuickReturns.StockTrading.ExchangeService.TradeService"> <endpoint address="Exchange" binding="basicHttpBinding" bindingConfiguration="" name="basicHttpBinding" contract="QuickReturns.StockTrading.ExchangeService. Contracts.ITradeService" />

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If the user requests a single thread, you will simply invoke the PrintNumbers() method within the primary thread However, if the user specifies two threads, you will create a ThreadStart delegate that points to PrintNumbers(), pass this delegate object into the constructor of a new Thread object, and call Start() to inform the CLR this thread is ready for processing To begin, set a reference to the SystemWindowsFormsdll assembly and display a message within Main() using MessageBoxShow() (you ll see the point of doing so once you run the program) Here is the complete implementation of Main(): Module Program Sub Main() ConsoleWriteLine("***** The Amazing Thread App *****") ConsoleWrite("Do you want [1] or [2] threads ") Dim threadCount As String = ConsoleReadLine() ' Name the current thread Dim primaryThread As Thread = ThreadCurrentThread primaryThreadName = "Primary" ' Display Thread info Console.

Even though most iPhone apps will run on the iPad, their smaller dimensions appear rather pixelized and inferior to native iPad apps But some developers may not want to maintain two separate Xcode projects for essentially the same product in order to properly support both platforms To solve this problem, iPhone SDK 32 introduced a new universal application format that runs on both iPhone and iPad devices Depending on the device running the universal application, the appropriate version of the app is launched This way, you can maintain one Xcode project with shared source code, but design separate user interfaces specifically tailored for each platform For example, your iPhone app may use a navigation controller for organizing content, yet on an iPad, you would most likely want to display a split view controller instead.

WriteLine("-> {0} is executing Main()", ThreadCurrentThreadName) ' Make worker class Dim p As Printer = New Printer() ' How many threads does the user want Select Case threadCount Case "2" ' User wants an extra thread Dim backgroundThread As Thread = _ New Thread(New ThreadStart(AddressOf pPrintNumbers)) backgroundThreadName = "Secondary" backgroundThreadStart().

Crossing boundaries is an expensive operation because it can constitute various elements such as data marshaling, security, physical location, and so on. Some of the design principles to keep in mind vis- -vis the first tenet are as follows: Know your boundaries: A well-defined and published public interface is the main entry point into the service, and all interactions occur using that. Services should be easy to consume: It should be easy for other developers to consume the service. Also, the service interface should allow the ability to evolve over time without breaking existing consumers of the service. Avoid RPC interfaces: Instead, use explicit messages. Keep the service surface area small: Provide fewer public interfaces that accept a well-defined message, and respond likewise with a well-defined message. As the number of public interfaces grows, it becomes increasingly difficult to consume and maintain the service. Don t expose implementation details: These should be kept internal; otherwise, it will lead to tight coupling between the consumer and the service.

Case "1" p.PrintNumbers() Case Else Console.WriteLine("I don't know what you want...you get 1 thread.") p.PrintNumbers() End Select MessageBox.Show("I'm busy!", "Work on main thread...") Console.ReadLine() End Sub End Module Now, if you run this program with a single thread, you will find that the message box will not display until the entire sequence of numbers has printed to the console. As you are explicitly pausing for approximately 2 seconds after each number is printed, this will result in a less-than-stellar end user experience. However, if you select two threads, the message box displays instantly, given that a unique Thread object is responsible for printing out the numbers to the console (see Figure 16-7).

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