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users of your APIs similarly take advantage of concurrency with a simple, familiar interface Each APM enabled operation offers two special methods If we have an ordinary synchronous method Foo, then implementing the APM version entails two new methods Begi n F oo and E n d Foo The transformation from Foo to the APM methods is simple

tional arguments appended, Asy n c C a l l b a c k c a l l b a c k and o b j e c t state, and i t returns a n IAsy n c R e s u lt object This object offers some convenient operations that allow you to poll or wait for completion Later we'll look at a standard implementation of IAsy n c R e s u lt that can be reused

type as Foo does Any exceptions that occur during the asynchro nous invocation of Foo are caught and then rethrown when E n d Foo is called But its primary purpose is to fetch the value returned by the asynchronous call The Asy n c C a l l b a c k type is just a delegate from the System namespace:

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intend to provide services) in the shareholding of the rm that owns the infrastructure ensures that the rm has little incentive to vertically integrate and provide services in competition with its owners If this consortium is regulated, this alternative can also potentially lead to a viable long-term competitive market structure 8575 Migration to desired industry structure Most telecommunications markets in the United States presently have the following xed infrastructures: the public switched telephone network (PSTN) and the cable infrastructure, owned by the ILECs and Cable MSOs respectively The assumption of oligopoly rents (or for some services, monopoly rents) accruing to the network owner have increased the valuation of these network assets considerably, as merger and acquisition activity in this industry has duly re ected time and again An arrangement that lowers the barriers to entry and promotes competition will have a dramatic impact on these valuations Therefore, it should come as no surprise that incumbents are likely to oppose any industry structure which reduces barriers to entry by service providers, and to lobby aggressively to frustrate any migration towards such a structure Indeed, the ILECs have successfully persuaded the FCC that they should be free of any obligation to provide UNEs over newly constructed FTTH networks [7], and the FCC has a pending Notice of Proposed Rule Making which would relieve them of providing open access as well [8]

p u b l i c delegate void Asyn c C a l l b a c k ( IAsy n c R e s u lt a r ) ;

The c a l l b a c k is invoked by the APM provider once Foo has finished run ning, making it easy to run some logic that consumes the results There are other ways to rendezvous with the completion of an asynchronous opera tion; we'll see more on this later The state is just an opaque object that is accessible inside your callback and / or completion logic Both c a l l b a c k and

The purpose of E n d Foo is three-fold First and foremost, it is responsible for retrieving the value that was returned from Foo, so long as the return type T is non-void Second, if an exception occurred during the execution of Fo o , E n d Foo will rethrow it so that your program can handle it as it would have if Foo had thrown it Failing to call E n d Foo means that you're poten tially swallowing an exception in your program And finally, E n d Foo will clean up resources associated with the asynchronous operation, often

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involving a kernel object meant to accommodate waiting All correctly written implementations of the APM should ensure that, even if E n d Foo is not called, resources are not leaked Usually that means having a finalizer or relying on smart resource handles-such as S a feHa n d l e s-that are already protected The IAsyn c R e s u l t interface, also from the System namespace, looks like the following

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