mirror of
https://github.com/overleaf/overleaf.git
synced 2024-09-16 02:52:31 -04:00
60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
// TODO: This file was created by bulk-decaffeinate.
|
|
// Sanity-check the conversion and remove this comment.
|
|
/*
|
|
* decaffeinate suggestions:
|
|
* DS101: Remove unnecessary use of Array.from
|
|
* DS102: Remove unnecessary code created because of implicit returns
|
|
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
|
|
*/
|
|
// A synchronous processing queue. The queue calls process on the arguments,
|
|
// ensuring that process() is only executing once at a time.
|
|
//
|
|
// process(data, callback) _MUST_ eventually call its callback.
|
|
//
|
|
// Example:
|
|
//
|
|
// queue = require 'syncqueue'
|
|
//
|
|
// fn = queue (data, callback) ->
|
|
// asyncthing data, ->
|
|
// callback(321)
|
|
//
|
|
// fn(1)
|
|
// fn(2)
|
|
// fn(3, (result) -> console.log(result))
|
|
//
|
|
// ^--- async thing will only be running once at any time.
|
|
|
|
module.exports = function (process) {
|
|
if (typeof process !== 'function') {
|
|
throw new Error('process is not a function')
|
|
}
|
|
const queue = []
|
|
|
|
const enqueue = function (data, callback) {
|
|
queue.push([data, callback])
|
|
return flush()
|
|
}
|
|
|
|
enqueue.busy = false
|
|
|
|
var flush = function () {
|
|
if (enqueue.busy || queue.length === 0) {
|
|
return
|
|
}
|
|
|
|
enqueue.busy = true
|
|
const [data, callback] = Array.from(queue.shift())
|
|
return process(data, function (...result) {
|
|
// TODO: Make this not use varargs - varargs are really slow.
|
|
enqueue.busy = false
|
|
// This is called after busy = false so a user can check if enqueue.busy is set in the callback.
|
|
if (callback) {
|
|
callback.apply(null, result)
|
|
}
|
|
return flush()
|
|
})
|
|
}
|
|
|
|
return enqueue
|
|
}
|