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|
(.module:
[library
[lux #*
["@" target]
["." ffi]
[abstract
["." monad (#+ do)]]
[control
["." try]
["." exception (#+ exception:)]
["." io (#+ IO io)]]
[data
["." text]
[collection
["." list]]]
[math
[number
["n" nat]
["f" frac]]]
[time
["." instant]]]]
[//
["." atom (#+ Atom)]])
(with_expansions [<jvm> (as_is (ffi.import: java/lang/Object)
(ffi.import: java/lang/Runtime
["#::."
(#static getRuntime [] java/lang/Runtime)
(availableProcessors [] int)])
(ffi.import: java/lang/Runnable)
(ffi.import: java/util/concurrent/TimeUnit
["#::."
(#enum MILLISECONDS)])
(ffi.import: java/util/concurrent/Executor
["#::."
(execute [java/lang/Runnable] #io void)])
(ffi.import: (java/util/concurrent/ScheduledFuture a))
(ffi.import: java/util/concurrent/ScheduledThreadPoolExecutor
["#::."
(new [int])
(schedule [java/lang/Runnable long java/util/concurrent/TimeUnit] #io (java/util/concurrent/ScheduledFuture java/lang/Object))]))]
(for {@.old (as_is <jvm>)
@.jvm (as_is <jvm>)
@.js
(as_is (ffi.import: (setTimeout [ffi.Function ffi.Number] #io Any)))
@.python
(ffi.import: threading/Timer
["#::."
(new [ffi.Float ffi.Function])
(start [] #io #? Any)])}
## Default
(type: Thread
{#creation Nat
#delay Nat
#action (IO Any)})
))
(def: .public parallelism
{#.doc (doc "How many processes can run in parallel.")}
Nat
(with_expansions [<jvm> (|> (java/lang/Runtime::getRuntime)
(java/lang/Runtime::availableProcessors)
.nat)]
(for {@.old <jvm>
@.jvm <jvm>}
## Default
1)))
(with_expansions [<jvm> (as_is (def: runner
java/util/concurrent/ScheduledThreadPoolExecutor
(java/util/concurrent/ScheduledThreadPoolExecutor::new (.int ..parallelism))))]
(for {@.old <jvm>
@.jvm <jvm>
@.js (as_is)
@.python (as_is)}
## Default
(def: runner
(Atom (List Thread))
(atom.atom (list)))))
(def: (execute! action)
(-> (IO Any) Any)
(case (try (io.run action))
(#try.Failure error)
(exec
("lux io log" ($_ "lux text concat"
"ERROR DURING THREAD EXECUTION:" text.new_line
error))
[])
(#try.Success _)
[]))
(def: .public (schedule milli_seconds action)
{#.doc (doc "Executes an I/O procedure after some milli-seconds.")}
(-> Nat (IO Any) (IO Any))
(with_expansions [<jvm> (as_is (let [runnable (ffi.object [] [java/lang/Runnable]
[]
(java/lang/Runnable [] (run self) void
(..execute! action)))]
(case milli_seconds
0 (java/util/concurrent/Executor::execute runnable runner)
_ (java/util/concurrent/ScheduledThreadPoolExecutor::schedule runnable (.int milli_seconds) java/util/concurrent/TimeUnit::MILLISECONDS
runner))))]
(for {@.old <jvm>
@.jvm <jvm>
@.js
(..setTimeout [(ffi.closure [] (..execute! action))
(n.frac milli_seconds)])
@.python
(do io.monad
[_ (|> (ffi.lambda [] (..execute! action))
[(|> milli_seconds n.frac (f./ +1,000.0))]
threading/Timer::new
(threading/Timer::start []))]
(in []))}
## Default
(do {! io.monad}
[now (\ ! map (|>> instant.millis .nat) instant.now)
_ (atom.update (|>> (#.Item {#creation now
#delay milli_seconds
#action action}))
..runner)]
(in [])))))
(for {@.old (as_is)
@.jvm (as_is)
@.js (as_is)
@.python (as_is)}
## Default
(as_is (exception: .public cannot_continue_running_threads)
## https://en.wikipedia.org/wiki/Event_loop
(def: .public run!
{#.doc (doc "Starts the event-loop.")}
(IO Any)
(loop [_ []]
(do {! io.monad}
[threads (atom.read ..runner)]
(case threads
## And... we're done!
#.End
(in [])
_
(do !
[now (\ ! map (|>> instant.millis .nat) instant.now)
.let [[ready pending] (list.partition (function (_ thread)
(|> (get@ #creation thread)
(n.+ (get@ #delay thread))
(n.<= now)))
threads)]
swapped? (atom.compare_and_swap threads pending ..runner)]
(if swapped?
(do !
[_ (monad.map ! (|>> (get@ #action) ..execute! io.io) ready)]
(recur []))
(error! (exception.error ..cannot_continue_running_threads []))))
))))
))
|
