Last change
on this file since 84d0fbb was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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100644
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File size:
1.3 KB
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[6a3a178] | 1 | var wrappy = require('wrappy')
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| 2 | var reqs = Object.create(null)
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| 3 | var once = require('once')
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| 4 |
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| 5 | module.exports = wrappy(inflight)
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| 6 |
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| 7 | function inflight (key, cb) {
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| 8 | if (reqs[key]) {
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| 9 | reqs[key].push(cb)
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| 10 | return null
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| 11 | } else {
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| 12 | reqs[key] = [cb]
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| 13 | return makeres(key)
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| 14 | }
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| 15 | }
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| 16 |
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| 17 | function makeres (key) {
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| 18 | return once(function RES () {
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| 19 | var cbs = reqs[key]
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| 20 | var len = cbs.length
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| 21 | var args = slice(arguments)
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| 22 |
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| 23 | // XXX It's somewhat ambiguous whether a new callback added in this
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| 24 | // pass should be queued for later execution if something in the
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| 25 | // list of callbacks throws, or if it should just be discarded.
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| 26 | // However, it's such an edge case that it hardly matters, and either
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| 27 | // choice is likely as surprising as the other.
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| 28 | // As it happens, we do go ahead and schedule it for later execution.
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| 29 | try {
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| 30 | for (var i = 0; i < len; i++) {
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| 31 | cbs[i].apply(null, args)
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| 32 | }
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| 33 | } finally {
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| 34 | if (cbs.length > len) {
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| 35 | // added more in the interim.
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| 36 | // de-zalgo, just in case, but don't call again.
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| 37 | cbs.splice(0, len)
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| 38 | process.nextTick(function () {
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| 39 | RES.apply(null, args)
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| 40 | })
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| 41 | } else {
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| 42 | delete reqs[key]
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| 43 | }
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| 44 | }
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| 45 | })
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| 46 | }
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| 47 |
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| 48 | function slice (args) {
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| 49 | var length = args.length
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| 50 | var array = []
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| 51 |
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| 52 | for (var i = 0; i < length; i++) array[i] = args[i]
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| 53 | return array
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| 54 | }
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