Clever Geek Handbook

How to prevent an unconfirmed promise from being hung?

Here's an example from clojure for the brave and the true:

(time
 (let [butter-promise (promise)]
   (doseq [butter [yak-butter-international butter-than-nothing baby-got-yak]]
     (future (if-let [satisfactory-butter (satisfactory? (mock-api-call butter))]
               (deliver butter-promise satisfactory-butter))))
   (println "And the winner is:" @butter-promise)))

What if none of the petroleum products meet our criteria?

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(let [butter-promise (promise)]
  ;; ...
  (if-let [winner (deref butter-promise 10000 nil)]
    (println "And the winner is:" winner)
    (println "Butter timed out."))


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