pending-queue

pending-queue

pending-queue ensures a certain asynchronous method only run once, and queues listeners which are registered to it.

Install

$ npm install pending-queue --save

Usage

const Queue = require('pending-queue')

let counter = 0
const queue = new Queue({
  load: (a, b) => {
    return new Promise((resolve) => {
      counter ++
      setTimeout(() => {
        resolve(a + b)
      }, 100)
    })
  }
})

function run () {
  queue.add(1, 2).then((value) => {
    console.log(value, counter)
  })
}

run()
run()
run()

// 3, 1
// 3, 1
// 3, 1

// So the load function ran only once.

new Queue({load, stringify})

• load function(...params) the method to get the value
• stringify function(params)=JSON.stringify stringify the parameters as the key to queue all asynchronous requests.

add(...params)

• params Arguments which will be passed into load

Returns Promise

License

MIT