nobloxmmc.js/lib/internal/queue.js

A Node.js wrapper for ROBLOX. (original from sentanos)

// Includes
var promise = require('./promise.js')
var options = require('../options.js')

// Define
module.exports = function (type, index, func, handler) {
  var group = options.queue[type]
  if (!group[index]) {
    group[index] = {
      jobs: []
    }
  }
  var home = group[index]
  function run (time) {
    return function (resolve, reject) {
      setTimeout(function () {
        func().then(resolve).catch(reject)
      }, time)
    }
  }
  function deactivate (err) {
    jobs.shift()
    if (!handler(err)) {
      home.last = Date.now()
    }
  }
  function next () {
    jobs.shift()
    home.last = Date.now()
  }
  if (group.delay > 0) {
    var jobs = home.jobs
    var delay = group.delay
    var last = home.last
    if (jobs.length === 0) {
      var item
      var diff = Date.now() - last
      if (!last || diff > delay) {
        item = func()
      } else {
        item = promise(run(delay - diff))
      }
      jobs.push(item)
      item.then(next).catch(deactivate)
      return item
    } else {
      var job = jobs[jobs.length - 1].then(function () {
        var item = promise(run(delay))
        item.then(next).catch(deactivate)
        return item
      }).catch(function (err) {
        var item = handler && handler(err) ? func() : promise(run(delay))
        item.then(next).catch(deactivate)
        return item
      })
      jobs.push(job)
      return job
    }
  } else {
    return func()
  }
}