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Part V
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Threading
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Comparing the APM and the EAP
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In this section, I compare the APM to the EPM . The biggest benefit of the EPM over the APM is that it can be used with the Visual Studio offering a design-time approach to invoke asynchronous operations . In addition, the EAP was introduced in the FCL at the same time as the SynchronizationContext class, and therefore it has built into it the ability to understand an application s threading model to ensure that, for GUI applications, the event handler method is invoked on the GUI thread . However, the APM is closer to the metal and the EAP classes are typically implemented internally using the APM . This means that EAP classes tend to use more memory and perform slower than their APM equivalents . In fact, the EAP must allocate EventArg-derived objects for all progress reporting and completion events that are raised . Several EPM classes also contain a collection of UserState objects identifying separate operations and an AsyncOperation object, too . In a typical GUI application, these additional memory allocations (which cause additional garbage collections) are probably insignificant . However, the EPM would be an inappropriate choice for building a high-performance server application . For simple scenarios, the EPM is easy to use and a fine choice . However, there are some scenarios where the EPM will actually be more complicated to use . If you call the XxxAsync method before registering the event handler method, it is possible that the asynchronous operation could complete before registering the event handler method and then the event handler method will not be invoked . Also, events are cumulative, and so you must unregister a method from the event and register a new method with the event if you want your next asynchronous operation to invoke a different method . Furthermore, static methods and singleton classes cannot offer the EPM for the same reason: different parts of an application may all register events at once, and all event handlers would be invoked when an operation completes regardless of which part of the application issued the asynchronous operation . Error handling with the EAP is incongruous with the rest of the system . First, exceptions aren t thrown; in your event handler, you must query the AsyncCompletedEventArgs s Exception property to see if it is null or not . If it is not null, then you have to use if statements to determine the type of the Exception-derived object instead of using catch blocks . And, if your code ignores the error, then no unhandled exception occurs, errors go undetected, and your application continues running with unpredictable results .
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Programming Model Soup
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Over the years, the .NET Framework has amassed a number of asynchronous programming models, each with its pros and cons, and I m sure that new programming models will appear in the future . In an effort to help you, I have produced Table 27-1, which summarizes the various models that currently exist . For each model, I show what s its intended primary use is (compute-bound or I/O-bound operations), how it can emulate the other kind of operation,
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27 I/O-Bound Asynchronous Operations
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if the model supports parent/child relationships, if the model natively supports progress reporting, cancellation, blocking a thread until the operation completes (a feature you should avoid), notifying you when a timeout expires, and if you can get the result (or exception) of the operation when it completes . Here are some additional notes about Table 27-1:
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Tasks offer improved performance over ThreadPool.QueueUserWorkItem or a delegate s BeginInvoke if many tasks are being issued due to the work-stealing queues . You can use the PreFairness flag to get the same thread pool behavior as ThreadPool.QueueUserWorkItem or a delegate s BeginInvoke . You can use a customized TaskScheduler, allowing you to change scheduling algorithms without changing the code or programming model .
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