rufus_scheduler_check.rb

#
# Question:
# How to check if rufus-scheduler is already running for my Rails Application?
#


def rufus_running?(s)
  return false unless s.up?
  return false unless s.thread.alive?
  true
end

def is_rufus_scheduler_already_running_in_my_rails_application?

  return false unless defined?(Rufus::Scheduler)

  ObjectSpace.each_object do |o|
    next unless o.is_a?(Rufus::Scheduler)
    return true if rufus_running?(o)
  end

  false
end
alias rufus? is_rufus_scheduler_already_running_in_my_rails_application?

fail "rufus should not be running..." if rufus? == true

require 'rufus-scheduler'

fail "rufus should not be running..." if rufus? == true

s = Rufus::Scheduler.new

fail "rufus should be running..." if rufus? == false

s.thread.exit
sleep 0.4

fail "rufus should not be running..." if rufus? == true