Module: Fume::Daemon::InstanceMethods

Defined in:
lib/fume/daemon.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#pid_file_path ⇒ Object

Returns the value of attribute pid_file_path.



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# File 'lib/fume/daemon.rb', line 19

def pid_file_path
  @pid_file_path
end

Instance Method Details

#already_running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fume/daemon.rb', line 51

def already_running?
  if self.pid_file_path && File.exists?(self.pid_file_path)
    pid = File.read(self.pid_file_path)
    return Process.kill(0, pid.to_i) == 1 if pid # test running
  end
  return false
rescue Errno::ESRCH #  NOT running or zombied
  return false
end

#daemon_name ⇒ Object 



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# File 'lib/fume/daemon.rb', line 25

def daemon_name
  self.class.name
end

#initialize ⇒ Object 



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# File 'lib/fume/daemon.rb', line 21

def initialize
  self.pid_file_path = Rails.root.join("tmp", "pids", "#{daemon_name}.pid")
end

#register_trap ⇒ Object 



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# File 'lib/fume/daemon.rb', line 29

def register_trap
  %w{TERM INT HUP}.each do |signal_name| 
    Signal.trap(signal_name) do
      self.stop
    end
  end
end

#remove_pid_file ⇒ Object 



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# File 'lib/fume/daemon.rb', line 47

def remove_pid_file
  FileUtils.rm(pid_file_path, :force => true) if self.pid_file_path && File.exists?(self.pid_file_path)
end

#start ⇒ Object 



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# File 'lib/fume/daemon.rb', line 61

def start
  return if already_running?
  begin
    register_trap
    write_pid_file(Process.pid)
    logger.info { "Daemon: #{daemon_name} starting ... PID: #{Process.pid}" }
  
    @run = true

    while @run
      self.execute
    end
    logger.info { "Daemon: #{daemon_name} stoped ..." }
  rescue Exception => e
    logger.error(e)
  ensure
    remove_pid_file
  end
end

#stop ⇒ Object 



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# File 'lib/fume/daemon.rb', line 81

def stop
  @run = false
end

#write_pid_file(pid) ⇒ Object 



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# File 'lib/fume/daemon.rb', line 41

def write_pid_file(pid)
  if self.pid_file_path
    File.open(self.pid_file_path, "w") { |f| f << pid }
  end
end