mirror of https://github.com/jkjoy/sunpeiwen.git
37 lines
842 B
JavaScript
37 lines
842 B
JavaScript
|
'use strict'
|
||
|
|
module.exports = inflight
|
||
|
|
|
||
|
|
let Bluebird
|
||
|
|
try {
|
||
|
|
Bluebird = require('bluebird')
|
||
|
|
} catch (_) {
|
||
|
|
Bluebird = Promise
|
||
|
|
}
|
||
|
|
|
||
|
|
const active = {}
|
||
|
|
inflight.active = active
|
||
|
|
function inflight (unique, doFly) {
|
||
|
|
return Bluebird.all([unique, doFly]).then(function (args) {
|
||
|
|
const unique = args[0]
|
||
|
|
const doFly = args[1]
|
||
|
|
if (Array.isArray(unique)) {
|
||
|
|
return Bluebird.all(unique).then(function (uniqueArr) {
|
||
|
|
return _inflight(uniqueArr.join(''), doFly)
|
||
|
|
})
|
||
|
|
} else {
|
||
|
|
return _inflight(unique, doFly)
|
||
|
|
}
|
||
|
|
})
|
||
|
|
|
||
|
|
function _inflight (unique, doFly) {
|
||
|
|
if (!active[unique]) {
|
||
|
|
active[unique] = (new Bluebird(function (resolve) {
|
||
|
|
return resolve(doFly())
|
||
|
|
}))
|
||
|
|
active[unique].then(cleanup, cleanup)
|
||
|
|
function cleanup() { delete active[unique] }
|
||
|
|
}
|
||
|
|
return active[unique]
|
||
|
|
}
|
||
|
|
}
|