@sapphire/async-queue

What is @sapphire/async-queue?

@sapphire/async-queue is a utility for managing asynchronous tasks in a sequential manner. It ensures that tasks are executed one after another, preventing race conditions and ensuring order.

What are @sapphire/async-queue's main functionalities?

Basic Queue Usage

This code demonstrates the basic usage of @sapphire/async-queue. It creates a queue and ensures that task1 and task2 are executed sequentially.

const { AsyncQueue } = require('@sapphire/async-queue');

const queue = new AsyncQueue();

async function task1() {
  await queue.wait();
  console.log('Task 1 started');
  setTimeout(() => {
    console.log('Task 1 completed');
    queue.shift();
  }, 1000);
}

async function task2() {
  await queue.wait();
  console.log('Task 2 started');
  setTimeout(() => {
    console.log('Task 2 completed');
    queue.shift();
  }, 500);
}

task1();
task2();

Handling Errors in Queue

This code demonstrates how to handle errors within the queue. Even if a task throws an error, the queue continues to process the next task.

const { AsyncQueue } = require('@sapphire/async-queue');

const queue = new AsyncQueue();

async function taskWithError() {
  await queue.wait();
  console.log('Task with error started');
  setTimeout(() => {
    console.log('Task with error encountered an error');
    queue.shift();
    throw new Error('Task error');
  }, 1000);
}

async function taskAfterError() {
  await queue.wait();
  console.log('Task after error started');
  setTimeout(() => {
    console.log('Task after error completed');
    queue.shift();
  }, 500);
}

taskWithError().catch(console.error);
taskAfterError();

Other packages similar to @sapphire/async-queue

async

The 'async' package provides a wide range of utilities for working with asynchronous JavaScript. It includes functions for parallel and sequential execution, among others. Compared to @sapphire/async-queue, 'async' offers more comprehensive functionality but can be more complex to use for simple sequential task management.

p-queue

The 'p-queue' package is a promise queue with concurrency control. It allows you to manage the execution of promises with a specified concurrency level. While 'p-queue' offers more advanced features like concurrency control, @sapphire/async-queue focuses on simple sequential execution.

queue

The 'queue' package is a simple and efficient queue implementation for Node.js. It supports basic queue operations and is easy to use. Compared to @sapphire/async-queue, it lacks built-in support for asynchronous task management but can be extended for such use cases.

README

@sapphire/async-queue

Sequential asynchronous lock-based queue for promises.

Description

Ever needed a queue for a set of promises? This is the package for you.

Features

• Written in TypeScript
• Bundled with esbuild so it can be used in NodeJS and browsers
• Offers CommonJS, ESM and UMD bundles
• Fully tested

Installation

You can use the following command to install this package, or replace npm install with your package manager of choice.

npm install @sapphire/async-queue

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Contributors

Please make sure to read the Contributing Guide before making a pull request.

Thank you to all the people who already contributed to Sapphire!