Class: Daemons::Monitor

Inherits:
Object
  • Object
show all
Defined in:
lib/daemons/monitor.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(an_app, options = {}) ⇒ Monitor

Returns a new instance of Monitor.



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# File 'lib/daemons/monitor.rb', line 28

def initialize(an_app, options = {})
  @app = an_app
  @app_name = an_app.group.app_name + '_monitor'
  @monitor_interval = options[:monitor_interval] || 30

  if an_app.pidfile_dir
    @pid = PidFile.new(an_app.pidfile_dir, @app_name, false)
  else
    @pid = PidMem.new
  end
end

Class Method Details

.find(dir, app_name) ⇒ Object 



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# File 'lib/daemons/monitor.rb', line 7

def self.find(dir, app_name)
  pid = PidFile.find_files(dir, app_name, false)[0]

  if pid
    pid = PidFile.existing(pid)

    unless PidFile.running?(pid.pid)
      begin; pid.cleanup; rescue ::Exception; end
      return
    end

    monitor = allocate

    monitor.instance_variable_set(:@pid, pid)

    return monitor
  end

  nil
end

Instance Method Details

#start(application_group) ⇒ Object 



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# File 'lib/daemons/monitor.rb', line 89

def start(application_group)
  return if application_group.applications.empty?

  if @pid.kind_of?(PidFile)
    start_with_pidfile(application_group)
  else
    start_without_pidfile(application_group)
  end
end

#stop ⇒ Object 



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# File 'lib/daemons/monitor.rb', line 99

def stop
  begin
    pid = @pid.pid
    Process.kill(Application::SIGNAL, pid)
    Timeout.timeout(5, TimeoutError) do
        while Pid.running?(pid)
          sleep(0.1)
        end
      end
  rescue ::Exception => e
    $stderr.puts "exception while trying to stop monitor process #{pid}: #{e}"
    $stderr.puts "deleting pid-file."
  end

  # We try to remove the pid-files by ourselves, in case the monitor
  # didn't clean it up.
  begin; @pid.zap; rescue ::Exception; end
end