Initialize the Delayed Jobs gem by starting the workers on application start

Question

I am using Ruby on Rails 3.0.9 and I am trying to setup the delay_job gem. All works if, after rebooting the Apache2 server, I run in the Terminal\\Console following command

Answer 1

I had a problem where the initializing delayed_job process was running though its initializers before creating the pid file (i.e. delayed_job.pid in case of a single worker and delayed_job.0.pid delayed_job.1.pid etc. in case of many workers)

So I resorted to creating my own lock file as such:

Delayed::Worker.destroy_failed_jobs = false
Delayed::Worker.sleep_delay = 2
Delayed::Worker.max_attempts = 5
Delayed::Worker.max_run_time = 4.hour
Delayed::Worker.delay_jobs = !Rails.env.test?

workers = 2


if Rails.env.production? || Rails.env.development?
  # Check if the delayed job process is already running
  # Since the process loads the rails env, this file will be called over and over
  # Unless this condition is set.
  pids = Dir.glob(Rails.root.join('tmp','pids','*'))

  system "echo \"delayed_jobs INIT check\""
  if pids.select{|pid| pid.start_with?(Rails.root.join('tmp','pids','delayed_job.init').to_s)}.empty?

    f = File.open(Rails.root.join('tmp','pids','delayed_job.init'), "w+") 
    f.write(".")
    f.close
    system "echo \"Restatring delayed_jobs...\""
    system "RAILS_ENV=#{Rails.env} #{Rails.root.join('bin','delayed_job')} stop"
    system "RAILS_ENV=#{Rails.env} #{Rails.root.join('bin','delayed_job')} -n #{workers} start"
    system "echo \"delayed_jobs Workers Initiated\""
    File.delete(Rails.root.join('tmp','pids','delayed_job.init')) if File.exist?(Rails.root.join('tmp','pids','delayed_job.init'))

  else
    system "echo \"delayed_jobs is running\""
  end
end

file: config\initializers\delayed_job.rb

Note: will not work for windows!