I can't speak for whether this is a truly idiomatic way of doing this, but
this is a macro i've been using for this case.
(defmacro plet [bindings & body] "Just like let, but evaluates bindings in
parallel" (let [bindings (partition-all 2 bindings) destructs (map
first bindings) expressions (map second bindings) vars
(repeatedly (count bindings) gensym)] `(let [~@(mapcat (fn [var expr] `[~var
(future ~expr)]) vars expressions) ~@(mapcat (fn [destr var] `[~destr
(deref ~var)]) destructs vars)] ~@body)))
This gives me a similar construct to let, but with each binding evaluated
in parallel using a future. For small sets i think this is less overhead
than pmap - note that unlike the traditional let, this will not handle
multiple bindings for the same variable properly.
Usage would then be
(plet [a (http/get "url1")
b (http/get "url2")]
(vec a b))
Or similar
Cheers
Glen
On Tuesday, 31 December 2013 08:46:53 UTC, chinmoy debnath wrote:
>
> I am a newbie in clojure. I need to send multiple http requests in
> parallel and need to have a call back when response for each request come
> back. What will be the idiomatic way of doing it in clojure?
> Thanks in advacne
>
>
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