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p u b l i c c l a s s My Form : Form { p rotected MyComponent m_myC = new MyComponent ( ) ; void I n i t i a l i ze ( ) { m_myC F ooComp leted += My F orm_F ooCom p l eted ; } void SomeButton_C l i c k ( ) { m_myC F ooAsy n c ( / * some pa ramet e r ( optiona l l y ) * / ) ; } void My F orm_F ooComp leted ( ob j e c t s e n d e r , FooCompletedEve ntArgs e ) { if ( e E r ror ! = n U l l )

The citation on Roderick Snell s IBC John Tucker Award, the international honor for excellence, reads: Presented to Roderick Snell for his lifetime s work in breaking down the barriers due to different standards for television and helping the world s broadcasting community to communicate with itself

} else {

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Something that is inherent to this example that may not be obvious is that the invocation of My F o rmJ ooCompleted will occur on the GUI thread (pro vided that F ooAsy n c was initiated from the GUI thread) This ensures that the completion handler can properly update GUI forms with the results of the computation Implementing this behavior properly (if you are an imple menter rather than a user of the pattern) requires you to learn about GUI threading, S y n c h ron i z at ionConte x t s , the Asyn cOperationMan age r, and the like We'll explore those topics in much more detail in 1 6, Graphical User Interfaces You may want to skip ahead to that now if you're particularly interested in learning more

Supporting Cancellation Another nice aspect of the event-based pattern is that it offers built in can cellation support This is not true of the APM For a pattern targeting CUIs, this is often a requirement It allows a user to stop some background com putation or network operation from continuing to consume machine resources when its results are no longer desired The specific way cancel lation is implemented will be discussed in other chapters: 1 3, Data and Task Parallelism, for cancellation of computations, and 1 5, Input and Output, for canceling I / O operations Supporting cancellation entails adding a C a n c e lAsy n c method Some times, you'll find a method that instead names the method F ooAsy n c C a n c e l to differentiate cancellation associated with a particular asynchronous API on the component The set of parameters this method should support depends on whether you support multiple outstanding asynchronous operations running at once For components that only support one, there are no parameters

The community network backbone, often spread across the metro access, collector and metro core areas, has two primary functions: aggregation and transport information While the optical

And for components that support multiple, the user state object will be used to specify which particular operation is to be canceled This requires some way of tracking all active asynchronous operations that are currently running, for example by using an internal lookup table

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When the C a n c e lAsy n c method returns, there is no guarantee that the operation will have been canceled When the event handler eventually fires, the C a n c e l led property on the event arguments will return t r u e to indicate that the operation was in fact canceled It is the responsibility of the imple mentation to ensure that this property is set correctly

Supporting Progress Reporting and I ncremental Results Because this pattern is typically consumed from within CUI applications, supporting progress and incremental result reporting is often beneficial This allows an application developer to update his or her CUI to reflect the

progress that's occurring in the background When doing some lengthy operation such as downloading a file over the network, this feature is an important one to facilitate a good user experience The basic model for progress reporting entails adding another event

How does this make him feel Typically combative, he starts by looking to expand the definition It is not just about broadcasting It is about taking our craft skills and experience beyond broadcasting, to IT and the cinema, to bigger areas just as IBC itself is doing I [felt] particularly honored to receive the award the year after Ray Dolby, he adds Ray is a great hero of mine He is a small guy who created world standards and created wealth without any of the trappings of big industry

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