Queue Utils

A simple tiny queue library in 354 bytes.

Exposes smartQueue function.

This library will work with analytics or as a standalone import in your code.

How to install

Install @analytics/queue-utils from npm.

npm install @analytics/queue-utils

API

Below is the api for @analytics/queue-utils. You can import only what you need & the rest will be tree-shaken out of your bundle.

smartQueue

Create a queue that batches items & processes them on an interval. Call smartQueue(handler, options) with a handler that receives the batch of items to process plus the remaining queue. It returns a queue instance with push, flush, resume, pause, & size methods.

Options:

• initial - Array of items to seed the queue with. Default [].
• max - Max number of items to process per batch. Default Infinity.
• interval - How often, in milliseconds, to process a batch. Default 10000.
• throttle - When true, overflow past max is not processed immediately, only on the next interval.
• onEmpty - Callback fired with the queue when it has been fully drained.
• onPause - Callback fired with the queue when pause is called.

import smartQueue from '@analytics/queue-utils'

// Queue options
const options = {
  max: 10, // process up to 10 items per batch
  interval: 3000, // 3s
  throttle: true, // Ensure only max is processed at interval
  onPause: (queue) => {
    console.log('queue paused', queue)
  },
  onEmpty: (queue) => {
    console.log('queue empty', queue)
  }
}

const queue = smartQueue((items, restOfQueue) => {
  console.log('items to process', items)
  console.log('rest of queue', restOfQueue)
}, options)

;[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20].forEach((item) => {
  // Push items to queue
  queue.push(item)
})

// Get queue size
console.log(queue.size())

// Flush & process queued items now
queue.flush()

// Pause queue
queue.pause()

// Resume queue
queue.resume()

Prior art

Fork of saturated