MQTTvue/mqtt-vue-dashboard/server/node_modules/retimer

retimer  

reschedulable setTimeout for your node needs. This library is built for building a keep alive functionality across a large numbers of clients/sockets.

Rescheduling a 10000 functions 20 times with an interval of 50ms (see bench.js), with 100 repetitions:

• benchSetTimeout*100: 40.295s
• benchRetimer*100: 36.122s

Install

npm install retimer --save

Example

var retimer = require('retimer')
var timer = retimer(function () {
  throw new Error('this should never get called!')
}, 20)

setTimeout(function () {
  timer.reschedule(50)
  setTimeout(function () {
    timer.clear()
  }, 10)
}, 10)

API

retimer(callback, timeout, [...args])

Exactly like your beloved setTimeout. Returns a Retimer object

timer.reschedule(timeout)

Reschedule the timer. Retimer will not gove any performance benefit if the specified timeout comes before the original timeout.

timer.clear()

Clear the timer, like your beloved clearTimeout.

How it works

Timers are stored in a Linked List in node.js, if you create a lot of timers this Linked List becomes massive which makes removing a timer an expensive operation. Retimer let the old timer run at its time, and schedule a new one accordingly, when the new one is after the original timeout. There is no performance gain when the new timeout is before the original one as retimer will just remove the previous timer.

License

MIT