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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