jobbr

= Jobbr

Jobbr is a Rails engine for supervising your delayed jobs and scheduled jobs (think Cron).

It provides a framework to abstract creation and execution of such jobs and a user interface to supervise jobs and read their logs.

{}[http://travis-ci.org/cblavier/jobbr]

== Screenshots

{}[http://cl.ly/image/3r320L101c3h] {}[http://cl.ly/image/21433N411G01]

== Dependencies

Jobbr has strong dependencies on following components:

• Mongoid: all jobs are stored in MongoDB for supervision. May be abstracted out later for ActiveRecord compatibility.
• Whenever: Jobbr uses {Whenever}[https://github.com/javan/whenever] gem to automatically updates Crontab during a Capistrano deployment.

== Setup

Start by adding Jobbr to your Gemfile:

gem 'jobbr'

=== User interface

Then mount Jobbr engine to your routes.rb file.

mount Jobbr::Engine => "/jobbr"

=== Scheduled Jobs

Use provided generators to create a first scheduled job

$> rails g jobbr:scheduled_job dummy

It will create a namespaced model as a well as a Whenever configuration file.

Provided you fill in description and scheduling attributes in the model, you will be able to see it in rake tasks:

$> rake -T | grep jobbr
rake jobbr:dummy_job  # A dummy Job

And to see it in your crontab preview:

$> whenever
30 5 * * * /bin/bash -l -c 'cd /Users/cblavier/code/my_app && RAILS_ENV=production bundle exec rake jobbr:dummy_job >> /Users/cblavier/code/my_app/log/cron.log 2>&1'

=== Heroku Scheduled Jobs

You can also use Heroku Scheduler to run jobs. Unfortunately Heroku does not provide Cron-scheduling, but let you run jobs every 10 minutes, every hour or every day.

Jobbr provides you with 3 tasks jobbr:heroku:minutely, jobbr:heroku:hourly and jobbr:heroku:daily, that will run any ScheduledJob with heroku_run directive.

Run following generator to create an heroku scheduled job

$> rails g jobbr:heroku_scheduled_job dummy_heroku

Then you will need to manually add jobs to the Heroku scheduler console

{}[http://cl.ly/image/2N1T1l1w2c28]

You also need to add an environment variable to let Jobbr know it's running on Heroku

heroku config:add HEROKU=true

=== Delayed Jobs

Use generators to get a new job model:

$> rails g jobbr:delayed_job dummy

You will get a new model with a perform method. Perform parameters are:

• params: is a hash of parameters for your job.

• run: is the object that will be persisted (and polled) for this job execution. Your delayed job can use it to provide progress information (to display a progress bar) and a final result.

  run.progress = 100 run.result = 'my job result'

You can now run your delayed job as following:

run_id = DelayedJobs::DummyJob.run_delayed(some_param: 37)

And then get job status like this:

Jobbr::Run.find(run_id).status # returns :waiting / :running / :failure / :success

Jobbr also provides a controller to run and poll delayed_jobs :

• Post on following url to run your job: delayed_job_creation_path(DelayedJobs::DummyJob, { some_param: 37 })

• And then poll this url (using the id returned in previous post) to get your job status: delayed_job_polling_path(run_id)

This project rocks and uses MIT-LICENSE.