On Thu, Jan 21, 2010 at 6:19 AM, Baishampayan Ghose
<[email protected]> wrote:
>
> It would be great if someone pointed out some example usage of
> promise/deliver.
I've used them to convert a callback-based (continuation-passing
style, if you will) API into a blocking one. The lib I was using
provides something you can call like:
(rpc-call destination method-args done)
Where 'done' is a function that gets called with the results of
the remote procedure call. But I want to write a function that
does rpc but *returns* the result, so...
(let [p (promise)]
(rpc-call destination method-args #(deliver p %))
@p)
This will work just fine whether rpc-call calls 'done'
synchronously, or if it returns right away and 'done' is called
by some other thread later.
--Chouser
http://joyofclojure.com/
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