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49 lines
1.1 KiB
49 lines
1.1 KiB
/**
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* RandomizedTimer takes a function to execute, and calls it on a randomized interval
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* between the minimum and maximum delay. The interval delay is randomized between
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* each scheduled call.
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*/
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export class RandomizedTimer {
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private _timeout?: NodeJS.Timeout | null;
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constructor(
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private _callback: () => void,
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private _minDelayMs: number,
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private _maxDelayMs: number,
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) {}
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/**
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* Sets the timeout and schedules the callback to be called.
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*/
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public enable(): void {
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this._setTimeout();
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}
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/**
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* Clears the timeout and prevents the callback from being called.
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*/
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public disable(): void {
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this._clearTimeout();
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}
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private _clearTimeout() {
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if (!this._timeout) { return; }
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clearTimeout(this._timeout);
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this._timeout = null;
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}
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private _setTimeout() {
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this._clearTimeout();
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const [min, max] = [this._minDelayMs, this._maxDelayMs];
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const delay = Math.floor(Math.random() * (max - min + 1)) + min;
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this._timeout = setTimeout(() => this._onTimeoutTriggered(), delay);
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}
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private _onTimeoutTriggered() {
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this._clearTimeout();
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this._callback();
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this._setTimeout();
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}
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}
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