javascript timing mechanism to allow multiple machines to sync to the same time, within 50 milliseconds

PollStation.js.coffee

class PollStation
  start: => @runner = setInterval @oneSecond, 50
  stop: => clearInterval(@runner)
  runner: undefined
  doOn: (num, func, args) =>
    $(document).on 'poll:oneSecond', (e, second, epochSecond) ->
      if (epochSecond % num) == 0
        $(document.body).trigger("poll:#{num}Second")
        func()
  oneSecond: =>
    d = new Date();
    epochSecond = (d) ->
      return Math.floor(d.getTime() / 1000)
    if d.getMilliseconds() < 50
      $(document.body).trigger("poll:oneSecond", [d.getSeconds(), epochSecond(d) ])


###
// example
poll = new PollStation;

poll.start();

// every 7 seconds, from the epoch, the function will be called and a poll event will be triggered on document body
poll.doOn(7, poll.stop);

// do something every second by listening for the event on the document
$(document).on "poll:oneSecond", ->
  console.log 'hi' ;

// do something every second by listening for the event on the document
$(document).on "poll:7Second", ->
  console.log 'hi 7'

// for debugging in the console:
window.stopPoll = poll.stop;
###