Current section

Files

Jump to
phoenix assets js phoenix timer.js
Raw

assets/js/phoenix/timer.js

/**
*
* Creates a timer that accepts a `timerCalc` function to perform
* calculated timeout retries, such as exponential backoff.
*
* @example
* let reconnectTimer = new Timer(() => this.connect(), function(tries){
* return [1000, 5000, 10000][tries - 1] || 10000
* })
* reconnectTimer.scheduleTimeout() // fires after 1000
* reconnectTimer.scheduleTimeout() // fires after 5000
* reconnectTimer.reset()
* reconnectTimer.scheduleTimeout() // fires after 1000
*
* @param {Function} callback
* @param {Function} timerCalc
*/
export default class Timer {
constructor(callback, timerCalc){
this.callback = callback
this.timerCalc = timerCalc
this.timer = null
this.tries = 0
}
reset(){
this.tries = 0
clearTimeout(this.timer)
}
/**
* Cancels any previous scheduleTimeout and schedules callback
*/
scheduleTimeout(){
clearTimeout(this.timer)
this.timer = setTimeout(() => {
this.tries = this.tries + 1
this.callback()
}, this.timerCalc(this.tries + 1))
}
}