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DLList = require "./DLList"

class Sync

constructor: (@name, @Promise) ->

@_running = 0

@_queue = new DLList()

isEmpty: -> @_queue.length == 0

_tryToRun: ->

if (@_running < 1) and @_queue.length > 0

@_running++

{ task, args, resolve, reject } = @_queue.shift()

cb = try

returned = await task args...

() -> resolve returned

catch error

() -> reject error

@_running--

@_tryToRun()

cb()

schedule: (task, args...) =>

resolve = reject = null

promise = new @Promise (_resolve, _reject) ->

resolve = _resolve

reject = _reject

@_queue.push { task, args, resolve, reject }

@_tryToRun()

promise

module.exports = Sync