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Figure 3-9. The service model runtime On the service side, you ll see a similar concept. At the service level you can do more powerful tasks because the service side is richer in functionality. The dispatch behavior level allows you to perform tasks such as initializing channels, inspecting messages, handling exceptions, selecting operations, and handling concurrency. The dispatch operation level can handle tasks such as inspecting parameters, serializing, handling transactions, and invoking calls.

0 SDK documentation specifically says an operation is atomic, you must assume it is thread-volatile and take precautions At this point, it should be clear that multithreaded application domains are in themselves quite volatile, as numerous threads can operate on the shared functionality at (more or less) the same time To protect an application s resources from possible corruption, NET developers must make use of any number of threading primitives (such as locks, monitors, and the <Synchronization> attribute) to control access to the data among the executing threads..

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Although the .NET platform cannot make the difficulties of building robust multithreaded applications completely disappear, the process has been simplified considerably. Using types defined within the System.Threading namespace, you are able to spawn additional threads with minimal fuss and bother. Likewise, when it is time to lock down shared points of data, you will find additional types that provide the same functionality as the Win32 API threading primitives (using a much cleaner object model). However, the System.Threading namespace is not the only way to build multithread .NET programs. During our examination of the .NET delegate (see 10), it was mentioned that all delegates have the ability to invoke members asynchronously. This is a major benefit of the .NET platform, given that one of the most common reasons a developer creates threads is for the purpose of invoking methods in a nonblocking (aka asynchronous) manner. Although you could make use of the System.Threading namespace to achieve a similar result, delegates make the whole process much easier.

iOS 3.2 also includes a new set of custom input methods that developers can use in their apps: edit menu actions, keyboard layouts, and gesture recognizers.

Most of the details until now have addressed how the service looks from the outside and a little bit about how it works from the inside. A powerful concept you haven t read about a lot until now is behaviors. Influencing the internals of a service, behaviors are applied at the service level, operation level, contract level, and endpoint level. WCF comes with several behaviors out of the box, which we ll cover in this section. With behaviors, it is possible to modify the runtime and eventually influence the internals of each type of concept where it applies (for example, endpoint, operation, contract, and service). From a programming model perspective, you can apply behaviors through configuration or by using the attributes available to you. Behaviors are something consumers of services have no direct notion of, and they are not expressed in the contract. So, they are all about concepts such as instancing lifetime, concurrency, and transactions. The interface of behaviors is defined in such a way that it allows you to influence different levels of your service. The levels are validation, bindings, and two methods that do the actual work either on the client side or on the server side. Each behavior has the interface shown in

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