promiseq

PromiseQ

Promise queue for node.js

This package will maintain a queue of promises and use promises to return completion of a task as well as completion of the queue.

Useful for migrations and work queues. This is inspired by promise-queue but built for Node.js and uses bluebird to provide the promises and async.queue to facilitate the queue operations.

Usage

var P = require('bluebird') //or whatever promise library you prefer such as `Q`
var PromiseQueue = require('promiseq')
var workerCount = 4 //defaults to number of cpus when left null

//setup the queue
var queue = new PromiseQueue(workerCount)

//make a job
var job = function(){
  return new P(function(resolve){
    process.nextTick(resolve)
  })
}

//add a single job
queue.push(job).then(function(){console.log('Job complete')})

//close the queue and listen for the drain
queue.close().then(function(){console.log('Queue closed and drained')})

Changelog

1.1.0

• Deprecated the processed stat in favor of complete
• Added failed stat that tracks error counts
• Added succeeded stat which is (complete - failed)

1.0.0

• Update dependencies
• Add canAccept() function to queue to see if slots are available
• Add allowance to allow overloading of canAccept() function
• Fix bug related to definition of total slots
• Update license and distributor details

0.1.0

• Initial release