scheduler.rb

class Scheduler
  def initialize
  end

  def start
    @scheduler = Rufus::Scheduler.start_new

    ['TERM', 'INT'].each do |signal|
      Signal.trap(signal) { stop }
    end

    Signal.trap('HUP') { reload_schedules }

    load_schedules

    @scheduler.join
  end

  def stop
    @scheduler.stop if @scheduler
    puts "Exiting scheduler" if Rails.env == 'development'
    Kernel.exit
  end

  def load_schedules
    return false unless @scheduler

    puts "Loading schedules" if Rails.env == 'development'

    BackupSettings.schedule_backups(@scheduler)

    puts "Finished loading schedules" if Rails.env == 'development'

    true
  end

  def unload_schedules
    return false unless @scheduler

    @scheduler.all_jobs.each {|job| @scheduler.unschedule(job) }
  end

  def reload_schedules
    unload_schedules
    load_schedules
  end

  class << self

    #
    # sends SIGHUP to a running instance of the scheduler
    #
    # expects the pid file in log/scheduler.rb.pid
    # 
    def reload_schedules_in_running_instances
      pid_file = File.join(Rails.root, 'log', 'schedule.rb.pid')

      return unless File.exists?(pid_file) && File.readable?(pid_file)

      pid = File.open(pid_file)

      begin
        pid = File.open(pid_file) {|f|
          f.gets.to_i
        }
      rescue ::Exception
        return
      end

      Process.kill('HUP', pid)
    end
  end
end