97 lines
1.8 KiB
JavaScript
97 lines
1.8 KiB
JavaScript
'use strict'
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let fastNow = Date.now()
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let fastNowTimeout
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const fastTimers = []
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function onTimeout () {
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fastNow = Date.now()
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let len = fastTimers.length
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let idx = 0
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while (idx < len) {
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const timer = fastTimers[idx]
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if (timer.state === 0) {
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timer.state = fastNow + timer.delay
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} else if (timer.state > 0 && fastNow >= timer.state) {
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timer.state = -1
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timer.callback(timer.opaque)
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}
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if (timer.state === -1) {
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timer.state = -2
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if (idx !== len - 1) {
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fastTimers[idx] = fastTimers.pop()
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} else {
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fastTimers.pop()
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}
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len -= 1
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} else {
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idx += 1
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}
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}
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if (fastTimers.length > 0) {
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refreshTimeout()
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}
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}
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function refreshTimeout () {
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if (fastNowTimeout && fastNowTimeout.refresh) {
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fastNowTimeout.refresh()
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} else {
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clearTimeout(fastNowTimeout)
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fastNowTimeout = setTimeout(onTimeout, 1e3)
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if (fastNowTimeout.unref) {
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fastNowTimeout.unref()
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}
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}
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}
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class Timeout {
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constructor (callback, delay, opaque) {
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this.callback = callback
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this.delay = delay
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this.opaque = opaque
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// -2 not in timer list
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// -1 in timer list but inactive
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// 0 in timer list waiting for time
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// > 0 in timer list waiting for time to expire
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this.state = -2
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this.refresh()
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}
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refresh () {
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if (this.state === -2) {
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fastTimers.push(this)
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if (!fastNowTimeout || fastTimers.length === 1) {
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refreshTimeout()
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}
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}
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this.state = 0
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}
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clear () {
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this.state = -1
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}
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}
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module.exports = {
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setTimeout (callback, delay, opaque) {
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return delay < 1e3
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? setTimeout(callback, delay, opaque)
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: new Timeout(callback, delay, opaque)
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},
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clearTimeout (timeout) {
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if (timeout instanceof Timeout) {
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timeout.clear()
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} else {
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clearTimeout(timeout)
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}
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}
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}
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