42 lines
851 B
JavaScript
42 lines
851 B
JavaScript
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// retoor <retoor@molodetz.nl>
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export class Poller {
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constructor(fn, intervalMs, { immediate = false, pauseHidden = true } = {}) {
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this.fn = fn;
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this.intervalMs = intervalMs;
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this.immediate = immediate;
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this.pauseHidden = pauseHidden;
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this.timer = null;
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this.busy = false;
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}
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start() {
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if (this.timer) {
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return this;
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}
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if (this.immediate) {
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this.tick();
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}
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this.timer = setInterval(() => this.tick(), this.intervalMs);
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return this;
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}
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stop() {
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clearInterval(this.timer);
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this.timer = null;
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}
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async tick() {
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if (this.busy || (this.pauseHidden && document.hidden)) {
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return;
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}
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this.busy = true;
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try {
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await this.fn();
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} catch (error) {
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console.debug("poller tick failed", error);
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} finally {
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this.busy = false;
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}
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}
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}
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