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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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p u b l i c interface IAsy n c R e s u lt { o b j e c t Asy n c St a t e { get j } W a i t H a n d l e AsyncWa i t H a n d l e { get j } bool Comp letedSy n c h ronou s ly { get j } bool I sCompleted { get j } }
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The properties are straightforward and can be used for the noncallback kinds of completion Asyn cState captures what was passed as state to the Beg i n F oo method, Asyn cWa itHa n d l e is a kernel object (typically a manual reset event) that is signaled once the operation completes, Comp letedSyn c h ronou s ly indicates whether the operation ran synchronously or asynchronously, and I sCompleted gets set to true when the operation is done Let's take an abstract example of what an APM counterpart for a sequential API looks like Given a sequential method F oo, the transforma tion is somewhat mechanical
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The standard APM methods would be:
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IAsy n c R e s u lt Beg i n F oo ( U u, , V v , Asyn c C a l l b a c k c a l l ba c k , o b j e c t state ) j T E n d F oo ( IAsy n c R e s u lt a sy n c R e s u lt ) j
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Looking past the syntax, let's talk about what these things do Begi n F oo is responsible for initiating Foo to run asynchronously, passing the argu ments U u , , V v This often means calling Qu e u e U s e rWo r k Item with
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a little wrapper over Foo so that success, failure, and completion can all be handled according to APM convention, that is:
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V v , Asyn c C a l l b a c k c a l l ba c k , o b j e c t state )
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t ry { II Store ret u rn v a l u e on a sy n c R e s u lt so we ret u r n on End Foo T retva l F oo ( u , , v ) ; a sync Result SetRetu rnVa l u e ( retva l ) ;
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II Store exception on a s y n c R e s u lt so we ret h row on E n d F oo a s y n c R e s u lt Set E x c e ption ( e ) ;