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(ns foami.core | |
"FOreign Asynchronous Mechanism Interop" | |
(:require [clojure.core.async :as async])) | |
(defn put! | |
"Takes a `ch`, a `msg`, a single arg function that when passed `true` enables backpressure | |
and when passed `false` disables it, and a no-arg function which, when invoked, closes the | |
upstream source." | |
[ch msg backpressure! close!] | |
(let [status (atom :sending)] | |
(async/put! ch msg | |
(fn [result] | |
(if-not result | |
(close!) | |
(when (compare-and-set! status :paused :sent) | |
(backpressure! false))))) | |
(when (compare-and-set! status :sending :paused) | |
(backpressure! true)) | |
nil)) |
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