Example schedule.rb to use flock as a background job mutex

schedule.rb

# frozen_string_literal: true

require 'digest'

# The command pattern to use. Note that placeholders like :path
# :task and :output will be replaced by whenever.
RAKE_COMMAND = 'cd :path && bundle exec rails :task --silent :output'

# Helper method for uniq file locks
def wrap_with_lock(prefix, command)
  lockfile_name = Digest::SHA256.hexdigest(prefix + command)
  "/usr/bin/flock -n :path/tmp/#{lockfile_name}.lock -c \"#{ command }\""
end

# Custom job type
job_type :processing_rake, wrap_with_lock('processing', RAKE_COMMAND)

every 5.minute do
  processing_rake 'data:process'
end