delayed-job

delayed-job

delayed-job is a horizontally scalable 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 delayed-job

Usage

var Scheduler = require('delayed-job');

var scheduler = Scheduler.createSchedule({
  backend: {
    name: 'redis',
    jobHoldingBay: 'myUniqueListKey'
  }
});

scheduler.on('job',function(job) {
  console.log('Received job',job);
});

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

scheduler.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