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The second pattern is called the event-based asynchronous pattern, aka asynchronous pattern for components and is meant for UI oriented components that must integrate with progress reporting and cancellation The distinguishing characteristic for APIs imple menting this pattern is the Asy n c suffix, in contrast with the Beg i n / E n d prefix for the APM This pattern is typically more compli cated to implement and also carries some semantic overhead (eg, requiring transfer back to the GUI thread) It can be simpler from a usage standpoint, however, because the only completion mechanism is event based (unlike the APM, which offers multiple mechanisms); additionally, Visual Studio provides a seamless development experi ence and makes it easy to hook up event handlers A related feature, B a c k g ro u n dWo r k e r, implements this pattern and is available for gen eral purpose asynchronous programming (see 1 6, Graphical User Interfaces)

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If you are creating a new API and trying to choose which pattern to implement, a good rule of thumb is that the APM is best when your target audience is other library developers, whereas the event-based model should be used if your primary target audience is application developers In the NET Framework 35, a slight variant is provided that is specific to asynchronous sockets programming Because it is not a pervasive and com monly used pattern, discussion is deferred to 1 5, Input and Out put, when we get to the specific asynchronous capabilities of sockets on Windows In the meantime, let's look at the two common patterns

Asynchronous Programming Model (APM)

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The APM is implemented by several NET Framework classes to provide a consistent pattern for programming asynchronous operations The exis tence of the APM means that in a lot of cases, as a user of concurrency, it's not even necessary for you to think about queuing work separately to the thread pool; it just happens in the implementation of some NET Frame work API that you call in your program And, as a library developer, pro viding APM versions of your compute- or I / O-bound operations helps the

8571 Private enterprise Private players own most of the current FTTH deployments in the United States Many ILECs, CLECs and Cable MSOs are in the process of making fundamental choices about technology and planning deployments Private players are expected to build the lowest cost networks and networks that facilitate as little competition as possible Though one can imagine private players (like electricity or gas companies) playing the role of a neutral infrastructure owner, ILECs, CLECs, Cable MSOs and other overbuilders who own the ber infrastructure are expected to be vertically integrated service providers as well This does not augur well for services competition above the facilities layer 8572 Subscriber (or community) There have been a few suggestions in contemporary literature [6] that, just as subscribers own their home networks, they should own the ber from the home to the CO There are in fact new housing builds where builders are contemplating building a ber to each home, where the ber is owned by the Homeowner s Association This green eld deployment can lead to a much lower cost, as trenching can be accomplished before roads are paved Though one can imagine subscriber ownership in green eld contexts, it looks very unlikely in current developed residential neighborhoods One can expect practical problems associated with getting all homes to participate Even if subscribers were to build and own their ber, there have to be special arrangements for maintenance of the ber 8573 Local government The local government, on the other hand, looks reasonably well-positioned to build FTTH infrastructure [6] Local governments of many cities have evinced strong interest in building FTTH infrastructure in order to attract hi-tech investment, and many FTTH deployments to date are municipally owned, either directly or through a municipally owned electric utility Government ownership of FTTH infrastructure can provide the neutral platform over which the private players can provide services In many communities, the public sector is a large consumer of bandwidth, therefore it seems reasonable for the local government to build this infrastructure The involvement of the local government can lead to an early and widespread deployment (contrary to the cherry picking that the private players are expected to engage in) Local governments also have easy access to rights of way and, depending on how the project is nanced, can also have access to low-cost capital By limiting its activities to building, owning and maintaining the ber, and with the private players owning the end electronics, the local government does not have to keep pace with electronics technology that is changing rapidly Therefore, a public private strategic partnership seems like one possibility that can lead to a competitive industry structure 8574 Investor-owned regulated common carrier A nal ownership possibility is that of an investor-owned common carrier that is rate-of-return regulated One particularly interesting case is if private players (who intend to provide service) form a consortium that builds and owns the ber The involvement of private players (who.

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Asy n c h ro n o u s Prolra m m l n l M o d e l (A P M )

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