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Joel Male 9380ee26ff add ability to call self-signed or invalid certificate clients

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fastq

Fast, in memory work queue.

Benchmarks (1 million tasks):

setImmediate: 812ms
fastq: 854ms
async.queue: 1298ms
neoAsync.queue: 1249ms

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.

Installation
Usage
API
Licence & copyright

Install

npm i fastq --save

Usage

'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)
}

var queue = require('fastq').promise(worker, 1)

async function worker (arg) {
  return 42 * 2
}

async function run () {
  const result = await queue.push(42)
  console.log('the result is', result)
})
}

run()

Setting this

'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)
}

API

fastqueue()
queue#push()
queue#unshift()
queue#pause()
queue#resume()
queue#idle()
queue#length()
queue#getQueue()
queue#kill()
queue#killAndDrain()
queue#error()
queue#concurrency
queue#drain
queue#empty
queue#saturated
fastqueue.promise()

fastqueue([that], worker, concurrency)

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.

queue.push(task, done)

Add a task at the end of the queue. done(err, result) will be called when the task was processed.

queue.unshift(task, done)

Add a task at the beginning of the queue. done(err, result) will be called when the task was processed.

queue.pause()

Pause the processing of tasks. Currently worked tasks are not stopped.

queue.resume()

Resume the processing of tasks.

queue.idle()

Returns false if there are tasks being processed or waiting to be processed. true otherwise.

queue.length()

Returns the number of tasks waiting to be processed (in the queue).

queue.getQueue()

Returns all the tasks be processed (in the queue). Returns empty array when there are no tasks

queue.kill()

Removes all tasks waiting to be processed, and reset drain to an empty function.

queue.killAndDrain()

Same than kill but the drain function will be called before reset to empty.

queue.error(handler)

Set a global error handler. handler(err, task) will be called when any of the tasks return an error.

queue.concurrency

Property that returns the number of concurrent tasks that could be executed in parallel. It can be altered at runtime.

queue.drain

Function that will be called when the last item from the queue has been processed by a worker. It can be altered at runtime.

queue.empty

Function that will be called when the last item from the queue has been assigned to a worker. It can be altered at runtime.

queue.saturated

Function that will be called when the queue hits the concurrency limit. It can be altered at runtime.

fastqueue.promise([that], worker(arg), concurrency)

Creates a new queue with Promise apis. It also offers all the methods and properties of the object returned by fastqueue with the modified push and unshift methods.

Node v10+ is required to use the promisified version.