t.rb

#
# config/initializers/ruote.rb

RuoteKit.configure do |c|

  c.run_worker = true unless $RAKE_TASK

  #c.set_storage(...

  c.register do

    participant 'daily' do |workitem|
      Toto::Operations.trigger_inbox_reminders
    end

    catchall Ruote::StorageParticipant
  end
end

if $RAKE_TASK != true && Rails.env != 'test'

  path = Rails.root.join(*%w[ tmp pids ruote_cron_process.wfid ]).to_s

  wfid = File.read(path).strip rescue nil

  RuoteKit.engine.cancel_process(wfid) if wfid

  wfid = RuoteKit.engine.launch(Ruote.define(:name => 'cron_process') do
    cron '0 6 * * *' do
      daily
    end
  end)

  File.open(path, 'wb') { |f| f.puts(wfid) }
end


#
# lib/toto/operations.rb

module Toto

  # Fires reminders for the workitems of the inbox participant.
  #
  def self.trigger_inbox_reminders

    workitems = RuoteKit.storage_participant.by_field('remind')

    users = workitems.inject({}) do |h, workitem|

      if (Time.now - workitem.last_reminder) > workitem.remind_frequency

        (h[workitem.user] || []) << workitem
      end

      h
    end

    users.each do |u, workitems|
      ::NotificationMailer.reminder(workitems)
    end
  end
end