Limit how many asynchronous operations can be in-flight simultaneously.
npm install zz-poolA promise pool implementation to limit concurrency.
This can be useful for example if you want to limit the number of HTTP requests that can be in-flight simultaneously:
``js
const Pool = require('zz-pool');
const fetch = require('node-fetch');
const pool = new Pool(10); // create a pool of size 10
async function fetchUrl(url) {
const response = await pool.enqueue(() => fetch(url));
return response;
}
`
You can enqueue many requests on the pool, but the 11th won't start until the first finishes. Only 10 are allowed to run simultaneously.
Create a pool that only allows size simultaneous asynchronous operations.
Enqueue an operation. The promiseFunc argument should be a function that returns a promise. enqueue returns a promise that resolves or rejects with the result of the promise returned by your promiseFunc`.