Class: Scheddy::Scheduler

Inherits:
Object
  • Object
show all
Defined in:
lib/scheddy/scheduler.rb

Instance Method Summary collapse

Instance Method Details

#hostname ⇒ Object 



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# File 'lib/scheddy/scheduler.rb', line 68

def hostname
  @hostname ||= Socket.gethostname.force_encoding(Encoding::UTF_8)
end

#logger ⇒ Object 



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# File 'lib/scheddy/scheduler.rb', line 80

def logger
  @logger ||= Scheddy.logger.tagged "scheddy-#{scheduler_id}"
end

#pid ⇒ Object 



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# File 'lib/scheddy/scheduler.rb', line 72

def pid
  @pid ||= Process.pid
end

#run ⇒ Object 



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# File 'lib/scheddy/scheduler.rb', line 12

def run
  puts "[scheddy] Hello. This is Scheddy v#{VERSION}."
  puts "[scheddy] hostname=#{hostname}, pid=#{pid}, id=#{scheduler_id}"
  trap_signals!
  puts "[scheddy] Starting scheduler with #{tasks.size} #{'task'.pluralize tasks.size}"
  unless register_process
    puts '[scheddy] No scheddy_task_schedulers table found; disabling cluster support'
  end

  until stop?
    with_leader do |new_leader|
      reset_tasks if new_leader
      cleanup_task_history
      cleanup_task_scheduler

      next_cycle = run_once
      if tasks.any? && scheduler_record
        next_cycle = [next_cycle, LEASE_RENEWAL_INTERVAL.from_now].compact.min
      end
      wait_until next_cycle unless stop?
    end
  end

  stepdown_as_leader

  running = tasks.select(&:running?).count
  if running > 0
    puts "[scheddy] Waiting for #{running} tasks to complete"
    wait_for(45.seconds, skip_stop: true) do
      tasks.none?(&:running?)
    end
    tasks.select(&:running?).each do |task|
      $stderr.puts "[scheddy] Killing task #{task.name}"
      task.kill
    end
  end

ensure
  unregister_process
  puts '[scheddy] Goodbye'
end

#run_once ⇒ Object

return : Time of next cycle



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# File 'lib/scheddy/scheduler.rb', line 55

def run_once
  if tasks.empty?
    logger.warn 'No tasks found; doing nothing'
    return 1.hour.from_now
  end
  tasks.filter_map do |task|
    task.perform(self) unless stop?
  end.min
end

#scheduler_id ⇒ Object 



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# File 'lib/scheddy/scheduler.rb', line 76

def scheduler_id
  @scheduler_id ||= SecureRandom.alphanumeric 12
end

#stepdown? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scheddy/scheduler.rb', line 65

def stepdown? ; @stepdown ; end

#stop? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scheddy/scheduler.rb', line 66

def stop? ; @stop ; end