Module: Qs::Daemon::InstanceMethods

Defined in:
lib/qs/daemon.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#daemon_data ⇒ Object (readonly)

Returns the value of attribute daemon_data.



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# File 'lib/qs/daemon.rb', line 30

def daemon_data
  @daemon_data
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/qs/daemon.rb', line 30

def logger
  @logger
end

#queue_redis_keys ⇒ Object (readonly)

Returns the value of attribute queue_redis_keys.



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# File 'lib/qs/daemon.rb', line 31

def queue_redis_keys
  @queue_redis_keys
end

#signals_redis_key ⇒ Object (readonly)

Returns the value of attribute signals_redis_key.



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# File 'lib/qs/daemon.rb', line 31

def signals_redis_key
  @signals_redis_key
end

Instance Method Details

#halt(wait = false) ⇒ Object 



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# File 'lib/qs/daemon.rb', line 103

def halt(wait = false)
  return unless self.running?
  @state.set :halt
  wakeup_thread
  wait_for_shutdown if wait
end

#initialize ⇒ Object

set the size of the client to the num workers + 1, this ensures we have 1 connection for fetching work from redis and at least 1 connection for each worker to requeue its message when hard-shutdown



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# File 'lib/qs/daemon.rb', line 36

def initialize
  self.class.configuration.validate!
  Qs.init
  @daemon_data = DaemonData.new(self.class.configuration.to_hash)
  @logger      = @daemon_data.logger

  @client = QsClient.new(Qs.redis_config.merge({
    :timeout => 1,
    :size    => self.daemon_data.num_workers + 1
  }))
  @queue_redis_keys = self.daemon_data.queue_redis_keys

  @signals_redis_key = "signals:#{@daemon_data.name}-" \
                       "#{Socket.gethostname}-#{::Process.pid}"

  @worker_available = WorkerAvailable.new

  @worker_pool = DatWorkerPool.new(self.daemon_data.worker_class, {
    :num_workers   => self.daemon_data.num_workers,
    :logger        => self.daemon_data.dwp_logger,
    :worker_params => self.daemon_data.worker_params.merge({
      :qs_daemon_data      => self.daemon_data,
      :qs_client           => @client,
      :qs_worker_available => @worker_available,
      :qs_logger           => @logger
    })
  })

  @thread = nil
  @state = State.new(:stop)
rescue InvalidError => exception
  exception.set_backtrace(caller)
  raise exception
end

#name ⇒ Object 



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# File 'lib/qs/daemon.rb', line 71

def name
  @daemon_data.name
end

#pid_file ⇒ Object 



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# File 'lib/qs/daemon.rb', line 79

def pid_file
  @daemon_data.pid_file
end

#process_label ⇒ Object 



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# File 'lib/qs/daemon.rb', line 75

def process_label
  @daemon_data.process_label
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/qs/daemon.rb', line 83

def running?
  !!(@thread && @thread.alive?)
end

#start ⇒ Object

ping to check that it can communicate with redis before running, this is friendlier than starting and continously erroring because it can’t dequeue



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# File 'lib/qs/daemon.rb', line 90

def start
  @client.ping
  @state.set :run
  @thread ||= Thread.new{ work_loop }
end

#stop(wait = false) ⇒ Object 



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# File 'lib/qs/daemon.rb', line 96

def stop(wait = false)
  return unless self.running?
  @state.set :stop
  wakeup_thread
  wait_for_shutdown if wait
end