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core.clj
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core.clj
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(ns conduit.core
(:use [clojure.contrib.seq-utils :only [indexed]]
[clojure.pprint :only [pprint]]
arrows.core))
(def *testing-conduit* false)
(defn merge-parts [ps]
(apply merge-with merge
(map :parts ps)))
(defn conduit-seq-fn [l]
(when (seq l)
(fn conduit-seq [x]
[[(first l)] (conduit-seq-fn (rest l))])))
(defn conduit-seq [l]
"create a stream processor that emits the contents of a list
regardless of what is fed to it"
(let [new-fn (conduit-seq-fn l)]
{:reply new-fn
:no-reply new-fn
:scatter-gather (fn [x]
(partial new-fn x))}))
(defn a-run [f]
"execute a stream processor function"
(when f
(let [[new-x new-f] (f nil)]
(if (empty? new-x)
(recur new-f)
(lazy-seq
(cons (first new-x)
(a-run new-f)))))))
(defn comp-fn [f1 f2]
"Link two processor functions together so that the output
of the first is fed into the second. Returns a function."
(cond
(nil? f1) f2
(nil? f2) f1
:else (fn a-comp [x]
(let [[x1 new1] (f1 x)
[x2 new2] (if (empty? x1)
[x1 f2]
(f2 (first x1)))]
(cond
(or (not new1) (not new2))
[x2 nil]
(and (= f1 new1) (= f2 new2))
[x2 a-comp]
:else
[x2 (comp-fn new1 new2)])))))
(defn ensure-vec [x-vec]
(if (vector? x-vec)
x-vec
(vec x-vec)))
(defn nth-fn [n f]
"creates a processor function that always applies a function to the
nth element of a given input vector, returning a new vector"
(fn a-nth [x]
(let [x (ensure-vec x)
[y new-f] (f (nth x n))
new-x (if (empty? y)
y
[(assoc x n (first y))])]
(if (= f new-f)
[new-x a-nth]
[new-x (when new-f
(nth-fn n new-f))]))))
(defn split-results [results]
(reduce (fn [[new-xs new-fs] [new-x new-f]]
[(conj new-xs new-x)
(conj new-fs new-f)])
[[] []]
results))
(defn sg-par-fn [fs xs]
(let [result-fns (doall (map #(%1 %2) fs xs))
[new-xs new-fs] (split-results (map #(%) result-fns))
new-x (if (some empty? new-xs)
[]
(vector (apply concat new-xs)))]
[new-x
(when (every? boolean new-fs)
(partial sg-par-fn new-fs))]))
;; TODO: put under unit test
(defn par-fn [fs xs]
(let [[new-xs new-fs] (split-results (map #(%1 %2) fs xs))
new-x (if (some empty? new-xs)
[]
(vector (apply concat new-xs)))]
[new-x (partial par-fn new-fs)]))
(defn loop-fn
([body-fn prev-x curr-x]
(let [[new-x new-f] (body-fn [prev-x curr-x])]
[new-x
(cond
(nil? new-f) nil
(empty? new-x) (partial loop-fn new-f prev-x)
:else (partial loop-fn new-f (first new-x)))]))
([body-fn feedback-fn prev-x curr-x]
(let [[new-x new-f] (body-fn [prev-x curr-x])
[fb-x new-fb-f] (if-not (empty? new-x)
(feedback-fn (first new-x)))]
[new-x
(cond
(nil? new-f) nil
(empty? new-x) (partial loop-fn new-f feedback-fn prev-x)
(nil? new-fb-f) nil
(empty? fb-x) (partial loop-fn new-f new-fb-f prev-x)
:else (partial loop-fn new-f new-fb-f (first fb-x)))])))
(defn sg-loop-fn
([body-fn prev-x curr-x]
(let [gather-fn (body-fn [prev-x curr-x])]
(fn []
(let [[new-x new-f] (gather-fn)]
[new-x
(cond
(nil? new-f) nil
(empty? new-x) (partial sg-loop-fn new-f prev-x)
:else (partial sg-loop-fn new-f (first new-x)))]))))
([body-fn feedback-fn prev-x curr-x]
(let [gather-fn (body-fn [prev-x curr-x])]
(fn []
(let [[new-x new-f] (gather-fn)
[fb-x new-fb-f] (if-not (empty? new-x)
(feedback-fn (first new-x)))]
[new-x
(cond
(nil? new-f) nil
(empty? new-x) (partial sg-loop-fn new-f feedback-fn prev-x)
(nil? new-fb-f) nil
(empty? fb-x) (partial sg-loop-fn new-f new-fb-f prev-x)
:else (partial sg-loop-fn new-f new-fb-f (first fb-x)))])))))
(defn select-fn [selection-map [v x]]
(if-let [f (if (contains? selection-map v)
(get selection-map v)
(get selection-map '_))]
(let [[new-x new-f] (f x)]
[new-x (when new-f
(partial select-fn
(assoc selection-map v new-f)))])
[[] (partial select-fn selection-map)]))
(defn no-reply-select-fn [selection-map [v x]]
(let [v (if (contains? selection-map v)
v
'_)]
(if-let [f (get selection-map v)]
(let [[new-x new-f] (f x)]
[new-x (partial no-reply-select-fn
(assoc selection-map v new-f))])
[[] (partial no-reply-select-fn selection-map)])))
(defn scatter-gather-select-fn [selection-map [v x]]
(if-let [f (if (contains? selection-map v)
(get selection-map v)
(get selection-map '_))]
(let [gather-fn (f x)]
(fn []
(let [[new-x new-f] (gather-fn)]
[new-x (when new-f
(partial scatter-gather-select-fn
(assoc selection-map v new-f)))])))
[[] (partial scatter-gather-select-fn selection-map)]))
(defn map-vals [f m]
(into {} (map (fn [[k v]]
[k (f v)])
m)))
;; TODO: make this execute in a future
(defn scatter-gather-comp [f sg x]
(let [[new-x new-f] (f x)]
(if (empty? new-x)
(fn []
[[] (when new-f
(partial scatter-gather-comp
new-f
sg))])
(let [gather-fn (sg (first new-x))]
(fn []
(let [[newer-x new-sg] (gather-fn)]
[newer-x (when (and new-f new-sg)
(partial scatter-gather-comp
new-f
new-sg))]))))))
(defn scatter-gather-nth [n sg x]
(let [x (ensure-vec x)
gather-fn (sg (nth x n))]
(fn []
(let [[y new-sg] (gather-fn)]
(if (empty? y)
[[] (when new-sg
(partial scatter-gather-nth
n
new-sg))]
[[(assoc x n (first y))]
(when new-sg
(scatter-gather-nth n new-sg))])))))
(defn a-par-scatter-gather [sgs x]
(let [x (ensure-vec x)
gather-fns (doall
(map #(%1 %2)
sgs
x))]
(fn []
(let [[new-xs new-sgs] (split-results
(map #(%) gather-fns))
new-x (if (some empty? new-xs)
[]
(vector (apply concat new-xs)))]
[new-x
(when (every? boolean new-sgs)
(partial a-par-scatter-gather
new-sgs))]))))
(defarrow conduit
[a-arr (fn [f]
(let [new-fn (fn a-arr [x]
[[(f x)] a-arr])
new-proc new-fn]
{:created-by :a-arr
:args f
:no-reply new-proc
:reply new-proc
:scatter-gather (fn a-arr-sg [x]
(fn []
[[(f x)] a-arr-sg]))}))
a-comp (fn [& ps]
(let [first-ps (map :reply (butlast ps))
last-p (last ps)
p (reduce comp-fn first-ps)
reply-fn (comp-fn p (:reply last-p))
no-reply-fn (comp-fn p (:no-reply last-p))]
{:parts (merge-parts ps)
:created-by :a-comp
:args ps
:reply reply-fn
:no-reply no-reply-fn
:scatter-gather (partial scatter-gather-comp
p
(:scatter-gather last-p))}))
a-nth (fn [n p]
{:created-by :a-nth
:args [n p]
:parts (:parts p)
:reply (nth-fn n (:reply p))
:no-reply (nth-fn n (:no-reply p))
:scatter-gather (partial scatter-gather-nth
n
(:scatter-gather p))})
a-par (fn [& ps]
{:created-by :a-par
:args ps
:parts (merge-parts ps)
:reply (partial sg-par-fn
(map :scatter-gather ps))
:no-reply (partial par-fn
(map (comp :no-reply
(partial a-comp {}))
ps))
:scatter-gather (partial a-par-scatter-gather
(map :scatter-gather ps))})
a-all (fn [& ps]
(assoc (a-comp (a-arr (partial repeat (count ps)))
(apply a-par ps))
:created-by :a-all
:args ps))
a-select (fn [& vp-pairs]
(let [pair-map (apply hash-map vp-pairs)]
{:created-by :a-select
:args pair-map
:parts (merge-parts (vals pair-map))
:reply (partial select-fn
(map-vals :reply pair-map))
:no-reply (partial no-reply-select-fn
(map-vals (comp :no-reply
(partial a-comp {}))
pair-map))
:scatter-gather (partial scatter-gather-select-fn
(map-vals :reply pair-map))}))
a-loop (fn
([body-proc initial-value]
(let [new-fn (partial loop-fn
(:reply body-proc)
initial-value)
sg-fn (partial sg-loop-fn
(:scatter-gather body-proc)
initial-value)]
{:created-by :a-loop
:args [body-proc initial-value]
:parts (:parts body-proc)
:reply new-fn
:no-reply new-fn
:scatter-gather sg-fn}))
([body-proc initial-value feedback-proc]
(let [new-fn (partial loop-fn
(:reply body-proc)
(:reply feedback-proc)
initial-value)]
{:created-by :a-loop
:args [body-proc initial-value feedback-proc]
:parts (:parts (merge-parts [body-proc
feedback-proc]))
:reply new-fn
:no-reply new-fn})))
])
(def a-arr (conduit :a-arr))
(def a-comp (conduit :a-comp))
(def a-nth (conduit :a-nth))
(def a-par (conduit :a-par))
(def a-all (conduit :a-all))
(def a-select (conduit :a-select))
(def a-loop (conduit :a-loop))
(def pass-through
(a-arr identity))
(defn a-selectp [pred & vp-pairs]
(a-comp
(a-all (a-arr pred)
pass-through)
(apply a-select vp-pairs)))
(defn a-if [a b & [c]]
(let [c (or c (constantly nil))]
(a-comp (a-all (a-arr (comp boolean a))
pass-through)
(a-select
true b
false c)
pass-through)))
(defn a-except [p catch-p]
(letfn [(a-except [f catch-f x]
(try
(let [[new-x new-f] (f x)]
[new-x (partial a-except new-f catch-f)])
(catch Exception e
(let [[new-x new-catch] (catch-f [e x])]
[new-x (partial a-except f new-catch)]))))
(a-except-sg [f catch-f x]
(try
(let [result-f (f x)]
(fn []
(try
(let [[new-x new-f] (result-f)]
[new-x (partial a-except-sg new-f catch-f)])
(catch Exception e
(let [[new-x new-catch] (catch-f [e x])]
[new-x (partial a-except-sg f new-catch)])))))
(catch Exception e
(fn []
(let [[new-x new-catch] (catch-f [e x])]
[new-x (partial a-except-sg f new-catch)])))))]
{:parts (:parts p)
:reply (partial a-except
(:reply p)
(:reply catch-p))
:no-reply (partial a-except
(:no-reply p)
(:no-reply catch-p))
:scatter-gather (partial a-except-sg
(:scatter-gather p)
(:reply catch-p))
:created-by :a-except
:args [p catch-p]}))
(defn a-finally [p final-p]
(letfn [(a-finally [f final-f x]
(try
(let [[new-x new-f] (f x)]
[new-x (partial a-finally new-f final-f)])
(finally
(final-f x))))
(a-finally-sg [f final-f x]
(try
(let [result-f (f x)]
(fn []
(try
(let [[new-x new-f] (result-f)]
[new-x (partial a-finally-sg new-f final-f)])
(finally
(final-f x)))))
(catch Exception e
(final-f x)
(throw e))))]
{:parts (:parts p)
:reply (partial a-finally
(:reply p)
(:reply final-p))
:no-reply (partial a-finally
(:no-reply p)
(:no-reply final-p))
:scatter-gather (partial a-finally-sg
(:scatter-gather p)
(:reply final-p))
:created-by :a-finally
:args [p final-p]}))
(defn conduit-do [p & [v]]
(a-arr (fn [x]
((:no-reply p) x)
[v])))
(defn conduit-map [p l]
(if-not (seq l)
(empty l)
(a-run (comp-fn (:reply (conduit-seq l))
(:no-reply p)))))
(defmacro def-arr [name args & body]
`(def ~name (a-arr (fn ~name ~args ~@body))))
(defn conduit-proc [proc-fn]
(let [new-fn (fn this-fn [x]
[(proc-fn x) this-fn])]
{:created-by :conduit-proc
:args proc-fn
:reply new-fn
:no-reply new-fn
:scatter-gather (fn [x]
(partial new-fn x))}))
(defmacro def-proc [name args & body]
`(def ~name (conduit-proc (fn ~name ~args ~@body))))
(defn disperse [p]
(let [reply-fn (fn disperse [xs]
(if (seq xs)
(let [new-x (a-run (comp-fn (conduit-seq-fn xs)
(:reply p)))]
[[new-x] disperse])
[[[]] disperse]))]
{:created-by :disperse
:args p
:parts (:parts p)
:reply reply-fn
:no-reply (fn disperse-final [xs]
[[(doall (conduit-map p xs))]
disperse-final])
:scatter-gather (fn [xs]
(partial reply-fn xs))}))
(defn test-conduit [p]
(binding [*testing-conduit* true]
(condp = (:created-by p)
nil p
:conduit-proc (conduit-proc (:args p))
:a-arr (a-arr (:args p))
:a-comp (apply a-comp (map test-conduit (:args p)))
:a-par (apply a-par (map test-conduit (:args p)))
:a-all (apply a-all (map test-conduit (:args p)))
:a-select (apply a-select (mapcat (fn [[k v]]
[k (test-conduit v)])
(:args p)))
:a-loop (let [[bp iv fb] (:args p)]
(if fb
(a-loop (test-conduit bp)
iv
(test-conduit fb))
(a-loop (test-conduit bp)
iv)))
:a-except (apply a-except (map test-conduit (:args p)))
:a-finally (apply a-finally (map test-conduit (:args p)))
:disperse (disperse (test-conduit (:args p))))))
(defn test-conduit-fn [p]
(comp first (:reply (test-conduit p))))
(defn debug-proc [label p]
(a-comp (a-arr (fn [x]
(println label "received:" x)
x))
p
(a-arr (fn [x]
(println label "produced:" x)
x))))