delayed-job

delayed-job is a horizontally scalable Node.js implementation of Ruby's delayed_job. Using semaphore locks it aims to provide an atomic interface to a federation of workers operating on the same job queue. Initial work has focussed on a Redis backed database, however more backend implementations are possible.

Installation

npm install @kev_nz/delayed-job

Usage

const Scheduler = require('@kev_nz/delayed-job')

const schedule = Scheduler.createSchedule({
  url: '',
  backend: {
    name: 'redis', // memory is also available
    jobHoldingBay: 'myUniqueListKey'
  }
})

schedule.on('job', job => {
  console.log('Received job',job);
})

const myJob = {
  title: 'Great Gig In The Sky'
}

schedule.delay(myJob, 2000)

API

schedular.delay(job, timeout)

Schedule a job for execution

Assumptions

• errors thrown will result in re-establishing the scheduler [expand]
• Single atomic source of truth
• Db interactions are also atomic
• Jobs emitted have no immediate relationship to one another

Prior Art

Originally based on https://github.com/thatguydan/delayed-job But that project hasn't been update in six years