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