Hello
This is not written as functional code. You have to understand that :
(cons f futures)
creates a new "version" of futures with f in front of it and cons *returns
it to you*. Put another way,* futures is not modified by cons*. In your
dotimes construct, the consed value is lost each loop. Have a look at
loop/recur, map, and reduce, these are the backbone functions when
programming in clojure.
Also, do not use (def) inside a function, this is ugly. use let to define
local bindings instead.
--
Philippe.
On Fri, May 23, 2014 at 10:16 AM, sorin cristea <srncris...@gmail.com>wrote:
>
> Hi all,
>
> do you have any idea how I can define a variable, global or inside a
> function, used to store for example the FutureTask objects resulted from
> ExecutorService submit(fn) call,I want to put all futures in a collection
> and later call 'get' on each of them. bellow is a sample of that code:
>
> (defn sample-fc
> []
> (def futures '())
> (dotimes [i 3]
> (def f (. thread-pool (submit (fn [] ("task result !!!")))))
> (cons f futures)
> )
> "shutdown the pool"
> (. thread-pool shutdown)
> (. thread-pool awaitTermination (. Long MAX_VALUE) (. TimeUnit SECONDS))
>
> "go through all futures an call get on them"
> (doseq [f futures]
> (println (. f get))
> )
> )
>
> when I do 'dosync' futures collection is empty, even if (def f (.
> thread-pool (submit (fn [] ("task result !!!"))))) is a a non empty
> object of type FutureTask(java.util.concurrent package).
>
> Do you know how to define 'futures' variable such that to keep all
> returned future ?
>
> thanks,
> Sorin
>
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Philippe
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