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(.using
[library
[lux (.except)
[abstract
[monad (.only do)]]
[control
["[0]" pipe]
["[0]" try (.only Try)]
["[0]" exception (.only exception:)]
["[0]" io (.only IO io)]]
[data
["[0]" bit]
["[0]" product]]
[macro
["[0]" local]]
[type (.only sharing)
[primitive (.only primitive representation abstraction)]]]]
[//
["[0]" atom (.only Atom atom)]
["[0]" async (.only Async Resolver)]
["[0]" frp (.only Channel Channel')]])
(exception: .public poisoned)
(exception: .public dead)
(local.let [<Mail> (template (_ Actor s)
[(-> s (Actor s) (Async (Try s)))])
<Obituary> (template (_ Actor s)
[[Text s (List (<Mail> Actor s))]])
<Mailbox> (template (_ Actor s)
[(Rec Mailbox
[(Async [(<Mail> Actor s) Mailbox])
(Resolver [(<Mail> Actor s) Mailbox])])])]
(these (def: (pending [read write])
(All (_ a)
(-> (Rec Mailbox
[(Async [a Mailbox])
(Resolver [a Mailbox])])
(IO (List a))))
(do [! io.monad]
[current (async.value read)]
(case current
{.#Some [head tail]}
(at ! each (|>> {.#Item head})
(pending tail))
{.#None}
(in {.#End}))))
(primitive .public (Actor s)
(Record
[#obituary [(Async (<Obituary> Actor s))
(Resolver (<Obituary> Actor s))]
#mailbox (Atom (<Mailbox> Actor s))])
(type: .public (Mail s)
(<Mail> Actor s))
(type: .public (Obituary s)
(<Obituary> Actor s))
(type: .public (Behavior s)
(-> (Mail s) s (Actor s) (Async (Try s))))
(def: .public (spawn! behavior init)
(All (_ s) (-> (Behavior s) s (IO (Actor s))))
(io (let [self (sharing [s]
(is (Behavior s)
behavior)
(is (Actor s)
(abstraction [#obituary (async.async [])
#mailbox (atom (async.async []))])))
process (loop (again [state init
[|mailbox| _] (io.run! (atom.read! (the #mailbox (representation self))))])
(do [! async.monad]
[[head tail] |mailbox|
?state' (behavior head state self)]
(case ?state'
{try.#Failure error}
(let [[_ resolve] (the #obituary (representation self))]
(exec (io.run!
(do io.monad
[pending (..pending tail)]
(resolve [error state {.#Item head pending}])))
(in [])))
{try.#Success state'}
(again state' tail))))]
self)))
(def: .public (alive? actor)
(All (_ s) (-> (Actor s) (IO Bit)))
(let [[obituary _] (the #obituary (representation actor))]
(|> obituary
async.value
(at io.functor each
(|>> (pipe.case
{.#None}
bit.yes
_
bit.no))))))
(def: .public (obituary' actor)
(All (_ s) (-> (Actor s) (IO (Maybe (Obituary s)))))
(let [[obituary _] (the #obituary (representation actor))]
(async.value obituary)))
(def: .public obituary
(All (_ s) (-> (Actor s) (Async (Obituary s))))
(|>> representation
(the #obituary)
product.left))
(def: .public (mail! mail actor)
(All (_ s) (-> (Mail s) (Actor s) (IO (Try Any))))
(do [! io.monad]
[alive? (..alive? actor)]
(if alive?
(let [entry [mail (async.async [])]]
(do !
[|mailbox|&resolve (atom.read! (the #mailbox (representation actor)))]
(loop (again [[|mailbox| resolve] |mailbox|&resolve])
(do !
[|mailbox| (async.value |mailbox|)]
(case |mailbox|
{.#None}
(do !
[resolved? (resolve entry)]
(if resolved?
(do !
[_ (atom.write! (product.right entry) (the #mailbox (representation actor)))]
(in {try.#Success []}))
(again |mailbox|&resolve)))
{.#Some [_ |mailbox|']}
(again |mailbox|'))))))
(in (exception.except ..dead [])))))
(type: .public (Message s o)
(-> s (Actor s) (Async (Try [s o]))))
(def: (mail message)
(All (_ s o) (-> (Message s o) [(Async (Try o)) (Mail s)]))
(let [[async resolve] (sharing [s o]
(is (Message s o)
message)
(is [(Async (Try o))
(Resolver (Try o))]
(async.async [])))]
[async
(function (_ state self)
(do [! async.monad]
[outcome (message state self)]
(case outcome
{try.#Success [state' return]}
(exec
(io.run! (resolve {try.#Success return}))
(async.resolved {try.#Success state'}))
{try.#Failure error}
(exec
(io.run! (resolve {try.#Failure error}))
(async.resolved {try.#Failure error})))))]))
(def: .public (tell! message actor)
(All (_ s o) (-> (Message s o) (Actor s) (Async (Try o))))
(let [[async mail] (..mail message)]
(do async.monad
[outcome (async.future (..mail! mail actor))]
(case outcome
{try.#Success}
async
{try.#Failure error}
(in {try.#Failure error})))))
)))
(def: .public default
Behavior
(function (_ mail state self)
(mail state self)))
(def: .public (poison! actor)
(All (_ s) (-> (Actor s) (IO (Try Any))))
(..mail! (function (_ state self)
(async.resolved (exception.except ..poisoned [])))
actor))
(type: .public Stop
(IO Any))
(def: continue! true)
(def: stop! false)
(def: .public (observe! action channel actor)
(All (_ r w s) (-> (-> r Stop (Mail s)) (Channel' r w) (Actor s) (IO Any)))
(let [signal (is (Atom Bit)
(atom.atom ..continue!))
stop (is Stop
(atom.write! ..stop! signal))]
(frp.subscribe! (function (_ event)
(do [! io.monad]
[continue? (atom.read! signal)]
(if continue?
(|> actor
(..mail! (action event stop))
(at ! each try.maybe))
(in {.#None}))))
channel)))
|
