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In some ways, this approach can be seen as the lazy way to write thread-safe code, given that you are not required to dive into the details about which aspects of the type are truly manipulating thread-sensitive data. The major downfall of this approach, however, is that even if a given method is not making use of thread-sensitive data, the CLR will still lock invocations to the method. Obviously, this could degrade the overall functionality of the type, so use this technique with care. At this point, you have seen a number of ways you are able to provide synchronized access to shared data. To be sure, additional types are available under the System.Threading namespace, which I will encourage you to explore at your leisure. To wrap up our examination of thread programming, allow me to introduce three additional types: TimerCallback, Timer, and ThreadPool.

Many applications have the need to call a specific method during regular intervals of time For example, you may have an application that needs to display the current time on a status bar via a given helper function As another example, you may wish to have your application call a helper function every so often to perform noncritical background tasks such as checking for new e-mail messages For situations such as these, you can use the SystemThreadingTimer type in conjunction with a related delegate named TimerCallback To illustrate, assume you have a console application that will print the current time every second until the user presses a key to terminate the application The first obvious step is to write the method that will be called by the Timer type: Sub PrintTime(ByVal state As Object) ConsoleWriteLine("Time is: {0}", _ DateTimeNow.

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<host> <baseAddresses> <add baseAddress="http://localhost:8000/QuickReturns/tradeservice" /> <add baseAddress="net.tcp://localhost:8080/QuickReturns/tradeservice" /> </baseAddresses> </host> <!-- specify wsHttpBinding with the WSAtomicTransacttional binding configuration --> <endpoint address="" binding="wsHttpBinding" bindingConfiguration="transactionalWsatHttpBinding" contract="QuickReturns.ITradeService" name="WSAtomicTransaction_endpoint" /> <!-- specify netTcpBinding and an OleTransactions transactional binding configuration since that is what WCF uses internally--> <endpoint address="" binding="netTcpBinding" bindingConfiguration="transactionalOleTransactionsTcpBinding" contract="QuickReturns.ITradeService" name="OleTransactions_endpoint" /> <! specify the Metadata Exchange --> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" name="mex_endpoint"/> </service> </services> In Listing 9-12, you will continue to modify App.config so that it utilizes the transactionFlow and sets it to true. Listing 9-12. Configuring Transaction Flow <!-- binding configuration - configures transaction flow --> <bindings> <netTcpBinding> <binding name="transactionalOleTransactionsTcpBinding " transactionFlow="true" transactionProtocol= "OleTransactions"/> </netTcpBinding>

ToLongTimeString()) End Sub Notice how this method has a single parameter of type SystemObject and is a subroutine, rather than a function This is not optional, given that the TimerCallback delegate can only call methods that match this signature The value passed into the target of your TimerCallback delegate can be any bit of information whatsoever (in the case of the e-mail example, this parameter might represent the name of the Microsoft Exchange server to interact with during the process) Also note that given that this parameter is indeed a SystemObject, you are able to pass in multiple arguments using a SystemArray or custom class/structure The next step is to configure an instance of the TimerCallback delegate and pass it into the Timer object.

By selling the iPad app as a separate product, you have the opportunity to recoup your development costs And if it provides additional value above and beyond your iPhone edition, then most customers won t have a problem with paying for it, even after they ve already purchased the iPhone version I say most because there will always be a select few users protesting that they should receive all app versions for all applicable Apple devices for free Ironically, the loudest complaints usually come from people who paid only 99 cents for your original iPhone app But don t cut off a potential revenue stream that could help support your continued development just because you re worried about keeping everyone happy Here s a little secret: It s not possible to please everyone Just build the best features and user experience possible.

In addition to configuring a TimerCallback delegate, the Timer constructor allows you to specify the optional parameter information to pass into the delegate target (defined as a SystemObject), the interval to poll the method, and the amount of time to wait (in milliseconds) before making the first call, for example: Sub Main() ConsoleWriteLine("***** Working with Timer type *****") ConsoleWriteLine() ' Create the delegate for the Timer type Dim timeCB As TimerCallback = AddressOf PrintTime ' Pass in the delegate instance, data to send the ' method 'pointed to', time to wait before starting ' and interval of time between calls Dim t As Timer = New Timer(timeCB, Nothing, 0, 1000) ConsoleWriteLine("Hit key to terminate..") ConsoleReadLine() End Sub.

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