I was wondering how to apply a transducer inside a go process. What I've so
far is the following
(defn pipe-xform [in-ch out-ch xform]
(let [tr
(let [tr (xform (fn
([result] result)
([result input] (conj! result input))))]
(fn
([] (locking tr (persistent! (tr (transient [])))))
([input] (locking tr (persistent! (tr (transient []) input
))))))]
(go-loop []
(if-some [value (<! in-ch)]
(do (doseq [v (tr value)]
(>! out-ch v))
(recur))
(do (doseq [v (tr)]
(>! out-ch v))
(close! out-ch))))))
Now, I could just do
(let [xf-ch (chan 1 xform)]
(pipe in-ch xf-ch)
(pipe xf-ch out-ch)
Or just redesign my code so that I can create in-ch or out-ch with the
transducer directly, but I was wondering whether there are any obvious
flaws with the pipe-xform implementation.
In particular, I was wondering about the locking. At first I was under the
impression that transducers are thread-safe due to the use of volatiles,
but looking at the partition-all transducer, which uses an ArrayList for
its state, It appears that's not the case.
Any feedback greatly appreciated.
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