Or you could just modify the source of promise ... i dont know why
promises dont support timeouts ....
(defprotocol PWait
(wait-for [this timeout units] [this timeout]))
;;copied from clojure source, but adding timeout wait-for
(defn promise
"Alpha - subject to change.
Returns a promise object that can be read with deref/@, and set,
once only, with deliver. Calls to deref/@ prior to delivery will
block. All subsequent derefs will return the same delivered value
without blocking."
{:added "1.1"}
[]
(let [d (java.util.concurrent.CountDownLatch. 1)
v (atom nil)]
(reify
clojure.lang.IDeref
(deref [_] (.await d) @v)
PWait
(wait-for [this timeout]
(wait-for this timeout
java.util.concurrent.TimeUnit/MILLISECONDS))
(wait-for [this timeout units]
(if timeout
(.await d timeout units)
(do (.await d) true)))
clojure.lang.IFn
(invoke [this x]
(locking d
(if (pos? (.getCount d))
(do (reset! v x)
(.countDown d)
x)
(throw
(IllegalStateException.
"Multiple deliver calls to a promise"))))))))
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