37 lines
1.0 KiB
TypeScript
37 lines
1.0 KiB
TypeScript
/**
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* Creates a timer that accepts a `timerCalc` function to perform 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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export default class Timer {
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timer: number | undefined = undefined
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tries: number = 0
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constructor(public callback: Function, public timerCalc: Function) {
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this.callback = callback
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this.timerCalc = timerCalc
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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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// Cancels any previous scheduleTimeout and schedules callback
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scheduleTimeout() {
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clearTimeout(this.timer)
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this.timer = <any>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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