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queue.js | пре 4 година |
Fast, in memory work queue. fastq
is API compatible with
async.queue
Benchmarks (1 million tasks):
Obtained on node 12.16.1, on a dedicated server.
If you need zero-overhead series function call, check out fastseries. For zero-overhead parallel function call, check out fastparallel.
npm i fastq --save
'use strict'
var queue = require('fastq')(worker, 1)
queue.push(42, function (err, result) {
if (err) { throw err }
console.log('the result is', result)
})
function worker (arg, cb) {
cb(null, 42 * 2)
}
'use strict'
var that = { hello: 'world' }
var queue = require('fastq')(that, worker, 1)
queue.push(42, function (err, result) {
if (err) { throw err }
console.log(this)
console.log('the result is', result)
})
function worker (arg, cb) {
console.log(this)
cb(null, 42 * 2)
}
fastqueue()
queue#push()
queue#unshift()
queue#pause()
queue#resume()
queue#idle()
queue#length()
queue#getQueue()
queue#kill()
queue#killAndDrain()
queue#concurrency
queue#drain
queue#empty
queue#saturated
Creates a new queue.
Arguments:
that
, optional context of the worker
function.worker
, worker function, it would be called with that
as this
,
if that is specified.concurrency
, number of concurrent tasks that could be executed in
parallel.Add a task at the end of the queue. done(err, result)
will be called
when the task was processed.
Add a task at the beginning of the queue. done(err, result)
will be called
when the task was processed.
Pause the processing of tasks. Currently worked tasks are not stopped.
Resume the processing of tasks.
Returns false
if there are tasks being processed or waiting to be processed.
true
otherwise.
Returns the number of tasks waiting to be processed (in the queue).
Returns all the tasks be processed (in the queue). Returns empty array when there are no tasks
Removes all tasks waiting to be processed, and reset drain
to an empty
function.
Same than kill
but the drain
function will be called before reset to empty.
Property that returns the number of concurrent tasks that could be executed in parallel. It can be altered at runtime.
Function that will be called when the last item from the queue has been processed by a worker. It can be altered at runtime.
Function that will be called when the last item from the queue has been assigned to a worker. It can be altered at runtime.
Function that will be called when the queue hits the concurrency limit. It can be altered at runtime.
ISC