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Services interaction should be using policies, schemas, and behaviors instead of classes, which have traditionally provided most of this functionality. The service contract should contain the message formats (defined using an XML schema), message exchange patterns (MEPs, which are defined in WSDL), any WS-Policy requirements, and any BPEL that may be required. The biggest challenge you face is the stability of the service, once it has been published. It gets difficult to change it then without impacting any of the consumers. The design principles to keep in mind for the third tenet are as follows: Service contracts constituting data, WSDL, and the policy do not change and remain stable. Contracts should be as explicit as possible; this will ensure there is no confusion over the intent and use of the service. Additional contracts should be defined for newer versions of the server in the future. If breaking service contracts is inescapable, then version the services because this minimizes the ripple to existing consumers of the service. Do not expose internal data representation publicly; the public data scheme should be absolute.

If you are unable to generate unpredictable outputs, increase the number of threads from 10 to 100 (for example) or introduce a call to Thread.Sleep() within your program. Eventually, you will encounter a concurrency issue.

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a single window, providing enough screen space in both portrait and landscape views In fact, Apple insists that iPad apps should support all orientations If your iPhone app is locked into a single orientation, you ll need to configure your universal app project to accommodate multiple orientations when displaying your iPad version s user interface So how does the app differentiate between your iPhone code and your iPad code This is where we encounter the next hurdle in developing universal applications Not only does your app need to detect the current platform and run the appropriate code, but when compiling your project in Xcode, you ll need to properly wrap your iPad code to prevent compiler errors Remember that in producing a universal application, the iPad features exclusive to iPhone SDK 3.

The first technique you can use to synchronize access to shared resources is the VB 2005 SyncLock keyword. This keyword allows you to define a scope of statements that must be synchronized between threads. By doing so, incoming threads cannot interrupt the current thread, preventing it from finishing its work. The SyncLock keyword requires you to specify a token (an object reference) that must be acquired by a thread to enter within the lock scope. When you are attempting to lock down an instance-level method, you can simply pass in a reference to the current type: ' Use the current object as the thread token. SyncLock Me ' All code within this scope is thread-safe. End SyncLock

If you examine the PrintNumbers() method, you can see that the shared resource the threads are competing to gain access to is the console window. Therefore, if you scope all interactions with the Console type within a lock scope as follows: Public Class Printer Public Sub PrintNumbers() SyncLock Me Console.WriteLine("-> {0} is executing PrintNumbers()", _ Thread.CurrentThread.Name) Console.Write("Your numbers: ") For i As Integer = 0 To 10 Dim r As Random = New Random() Thread.Sleep(100 * r.Next(5)) Console.Write(i & ", ") Next Console.WriteLine() End SyncLock End Sub End Class you have effectively designed a method that will allow the current thread to complete its task. Once a thread enters into a SyncLock scope, the lock token (in this case, a reference to the current object) is inaccessible by other threads until the lock is released once the SyncLock scope has exited. Thus, if Thread A has obtained the lock token, other threads are unable to enter the scope until Thread A relinquishes the lock token. If you now run the application, you can see that each thread has ample opportunity to finish its business, as shown in Figure 16-10.

At times you will not be able to express all the requirements of service interaction via WSDL alone, which is when you can use policies. Policy expressions essentially separate the structural and semantic compatibility. In other words, they separate what is communicated and how/whom a message is communicated. A policy assertion identifies a behavior of a policy entity and provides domain-specific semantics. When designing a service, you need to ensure

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