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|
(.require
[library
[lux (.except and or)
[abstract
[functor (.only Functor)]
[apply (.only Apply)]
["[0]" monad (.only Monad do)]]
[control
["[0]" pipe]
["[0]" function]
["[0]" io (.only IO io)]
["[0]" maybe (.use "[1]#[0]" functor)]]
[data
["[0]" product]]
[meta
[macro
["^" pattern]]
[type (.only sharing)
[primitive (.except)]
["[0]" variance (.only Mutable)]]]]]
[//
["[0]" thread]
["[0]" atom (.only Atom atom)]])
(def Value
(template (_ a)
[(Maybe a)]))
(def Handler
(template (_ a)
[(-> a (IO Any))]))
(primitive (Async'' a)
(Atom [(Value a) (List (Handler a))])
(type .public (Async' r w)
(Async'' (Mutable r w)))
(type .public (Async a)
(Async'' (Mutable a a)))
(type .public (Resolver w)
(-> w (IO Bit)))
... Sets an async's value if it has not been done yet.
(def (resolver async)
(All (_ r w) (-> (Async' r w) (Resolver w)))
(function (resolve value)
(let [async (representation async)]
(do [! io.monad]
[(^.let old [_value _observers]) (atom.read! async)]
(when _value
{.#Some _}
(in false)
{.#None}
(do !
[succeeded? (atom.compare_and_swap! old [{.#Some (variance.write value)} (list)] async)]
(if succeeded?
(do !
[_ (monad.each ! (function.on (variance.write value))
_observers)]
(in true))
(resolve value))))))))
(def .public (resolved value)
(All (_ a) (-> a (Async a)))
(abstraction (atom [{.#Some (variance.write value)} (list)])))
(def .public (async _)
(All (_ r w) (-> Any [(Async' r w) (Resolver w)]))
(let [async (abstraction (atom [{.#None} (list)]))]
[async (..resolver async)]))
(def .public value
(All (_ r w) (-> (Async' r w) (IO (Value r))))
(|>> representation
atom.read!
(at io.functor each (|>> product.left
(maybe#each (|>> variance.read))))))
(def .public (upon! f async)
(All (_ r w) (-> (Handler r) (Async' r w) (IO Any)))
(do [! io.monad]
[.let [async (representation async)]
(^.let old [_value _observers]) (atom.read! async)]
(when _value
{.#Some value}
(f (variance.read value))
{.#None}
(do !
[swapped? (atom.compare_and_swap! old [_value {.#Item (|>> variance.read f) _observers}] async)]
(if swapped?
(in [])
(upon! f (abstraction async)))))))
)
(def .public resolved?
(All (_ r w) (-> (Async' r w) (IO Bit)))
(|>> ..value
(at io.functor each
(|>> (pipe.when
{.#None}
false
{.#Some _}
true)))))
(def .public functor
(Functor Async)
(implementation
(def (each f fa)
(let [[fb resolve] (sharing [a b]
(is (-> a b)
f)
(is [(Async b) (Resolver b)]
(..async [])))]
(exec
(io.run! (..upon! (|>> f resolve) fa))
fb)))))
(def .public apply
(Apply Async)
(implementation
(def functor ..functor)
(def (on fa ff)
(let [[fb resolve] (sharing [a b]
(is (Async (-> a b))
ff)
(is [(Async b) (Resolver b)]
(..async [])))]
(exec
(io.run! (..upon! (function (_ f)
(..upon! (|>> f resolve) fa))
ff))
fb)))))
(def .public monad
(Monad Async)
(implementation
(def functor ..functor)
(def in ..resolved)
(def (conjoint mma)
(let [[ma resolve] (sharing [a]
(is (Async (Async a))
mma)
(is [(Async a) (Resolver a)]
(..async [])))]
(exec
(io.run! (..upon! (..upon! resolve) mma))
ma)))))
(def .public (and left right)
(All (_ lr lw rr rw) (-> (Async' lr lw) (Async' rr rw) (Async [lr rr])))
(let [[read! write!] (sharing [lr lw rr rw]
(is [(Async' lr lw) (Async' rr rw)]
[left right])
(is [(Async [lr rr]) (Resolver [lr rr])]
(..async [])))
_ (io.run! (..upon! (function (_ left)
(..upon! (function (_ right)
(write! [left right]))
right))
left))]
read!))
(def .public (or left right)
(All (_ lr lw rr rw) (-> (Async' lr lw) (Async' rr rw) (Async (Or lr rr))))
(let [[left|right resolve] (sharing [lr lw rr rw]
(is [(Async' lr lw) (Async' rr rw)]
[left right])
(is [(Async (Or lr rr)) (Resolver (Or lr rr))]
(..async [])))]
(with_expansions
[<sides> (with_template [<async> <tag>]
[(io.run! (upon! (|>> {<tag>} resolve) <async>))]
[left .#Left]
[right .#Right]
)]
(exec
<sides>
left|right))))
(def .public (either left right)
(All (_ a lw rw) (-> (Async' a lw) (Async' a rw) (Async a)))
(let [[left||right resolve] (sharing [a lw rw]
(is [(Async' a lw) (Async' a rw)]
[left right])
(is [(Async a) (Resolver a)]
(..async [])))]
(`` (exec
(,, (with_template [<async>]
[(io.run! (upon! resolve <async>))]
[left]
[right]))
left||right))))
(def .public (schedule! milli_seconds computation)
(All (_ a) (-> Nat (IO a) (Async a)))
(let [[!out resolve] (sharing [a]
(is (IO a)
computation)
(is [(Async a) (Resolver a)]
(..async [])))]
(exec
(|> (do io.monad
[value computation]
(resolve value))
(thread.schedule! milli_seconds)
io.run!)
!out)))
(def .public future
(All (_ a) (-> (IO a) (Async a)))
(..schedule! 0))
(def .public (after milli_seconds value)
(All (_ a) (-> Nat a (Async a)))
(..schedule! milli_seconds (io value)))
(def .public (delay milli_seconds)
(-> Nat (Async Any))
(..after milli_seconds []))
(def .public (within milli_seconds async)
(All (_ r w) (-> Nat (Async' r w) (Async (Maybe r))))
(..or (..delay milli_seconds)
async))
|
