Lecture 379:- Setting up Kue and Using it

Kue is a priority job queue library for Node.js that allows you to handle job processing in the background. It provides features like delaying, repeating, and prioritizing tasks. In this section, we will learn how to install and set up Kue for delayed job processing in our Node.js application.

To install Kue, we can use the npm package manager. Open the terminal and type the following command:

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npm install kue

After installing Kue, we need to require it in our code and create a Kue job queue object.

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const kue = require('kue'); // create a Kue job queue object const queue = kue.createQueue();

Next, we need to define a job to be processed by Kue. The job consists of a name, data, and a processing function. We define the job and the processing function as follows:

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// define a job with a name and data const job = queue.create('email', {  subject: 'Welcome to our application',  to: '[email protected]',  template: 'welcome-email' }); // define a processing function for the job job.on('complete', function () {  console.log('Job', job.id, 'with name', job.type, 'is done'); }); // add the job to the queue job.save();

In the above example, we define a job with a name email and data object that contains the email subject, recipient email address, and email template name. We also define a processing function that logs a message when the job is completed.

To add the job to the queue, we call the save() method on the job object. Once added to the queue, Kue will process the job in the background.

We can start the Kue worker process to process jobs in the background by running the following command in the terminal:

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node node_modules/kue/bin/kue-worker.js

This will start the worker process, and it will start processing jobs in the queue.

In summary, Kue is a powerful job queue library for Node.js that provides a simple API for handling background job processing. We can use it to process delayed jobs, schedule jobs to run in the future, prioritize jobs, and much more.