European Clojure Training, Brussels, late June

unsorted — cgrand, 14 April 2010 @ 12 h 29 min

Following a recent tweet, I’m setting up a Clojure training session with Lau B. Jensen and we’d like to know more about our potential attendees. Please fill this short survey:


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Pipe dreams aren’t necessarily made of promises

unsorted — cgrand, 2 April 2010 @ 14 h 31 min

Because of the spinning nature of atoms, it’s kind of a hack (a fun hack but still a hack) to build queues on it. Here is the same pipe function built on Java queues:

(defn pipe []
  (let [q (java.util.concurrent.LinkedBlockingQueue.)
        EOQ (Object.)
        NIL (Object.)
        s (fn s [] (lazy-seq (let [x (.take q)] 
                               (when-not (= EOQ x) 
                                 (cons (when-not (= NIL x) x) (s))))))]
    [(s) (fn ([] (.put q EOQ)) ([x] (.put q (or x NIL))))]))
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