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We've implemented the first half of the promise idea However, the coupling of blocking with the communication of value availability is worth revisiting In the above types, we have made blocking a non-negotiable part of both types' Va l u e property semantics Clearly supporting a way of polling for the availability of a value so that a thread can decide not to block would be
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useful, as would a timeout variant that waits for at most a specified period of time However, blocking is often a bad idea to begin with We can work around blocking by using an event driven approach that encourages continuation passing to represent work to be done once a value has been resolved Using this approach, a thread can queue a delegate to be invoked asynchronously once the value has been resolved, and the future or promise itself handles dispatching these work items Since it is more general purpose, we will extend the P romi s e < T > type above to sup port this capability, via a new W h e n API It accepts an Act i o n < T > that is to receive the resolved value once it is available As an illustration, say we have a promise that was generated via the R e a dC h u n k API above and want to do some analysis on the byte [ ] read off the disk once it becomes available The traditional approach would be to block waiting for it
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F i leStream my F s = j P romi s e < byte [ ] > p = ReadChu n k ( my F s , 4096 ) j I I do ot her wo r k I I Some t ime l a t e r when we want t h e v a l u e , we must wait for it Proc e s s Bytes ( p Va l u e ) j
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p u b l i c c l a s s Prom i s e < T > { private Queue<Action < T a s before public void When (Action < T > resolveAction ) { m_resolveActions
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lock ( m_resolveAction s ) { if ( m_state 2 && m_exception nUll ) Th readPool QueueuserWorkltem ( d elegate { resolveAction ( m_va lue ) j })j else m_resolveActions E nqueue ( resolveAction ) j } } private void Set ( T v a l u e , E x c e ption except ion ) { if ( m_state a && Interloc ked Comp a re E x c hange ( ref m_s t a t e , 1 , a ) { m_v a l u e va l u e ; m_exception exception ; m_state 2; m_event Set ( ) ;
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= = = == == == ==
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We have added a new queue of completion actions, m_re so !veAc t i o n s, containing all of the registered delegates It's worth considering lazily allocating this queue, particularly if When will only be called on a subset of