Class: Vedeu::Logging::LocklessLogDevice

Inherits:
Logger::LogDevice
  • Object
show all
Defined in:
lib/vedeu/logging/lockless_log_device.rb

Overview

Ensures we can always write to the log file by creating a lock-less log device.

Instance Method Summary collapse

Constructor Details

#initialize(log = nil) ⇒ Vedeu::Logging::LocklessLogDevice

Returns a new instance of Vedeu::Logging::LocklessLogDevice.

Parameters:

  • log (void) (defaults to: nil) 


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# File 'lib/vedeu/logging/lockless_log_device.rb', line 14

def initialize(log = nil)
  @dev      = nil
  @filename = nil

  if log.respond_to?(:write) && log.respond_to?(:close)
    @dev = log

  else
    @dev      = open_logfile(log)
    @dev.sync = true
    @filename = log

  end
end

Instance Method Details

#close ⇒ void

This method returns an undefined value.



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# File 'lib/vedeu/logging/lockless_log_device.rb', line 39

def close
  @dev.close
rescue
  nil
end

#open_logfile(log) ⇒ void (private)

This method returns an undefined value.

Parameters:

  • log (String) 


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# File 'lib/vedeu/logging/lockless_log_device.rb', line 49

def open_logfile(log)
  if FileTest.exist?(log)
    open(log, (File::WRONLY | File::APPEND))

  else
    logdev = open(log, (File::WRONLY | File::APPEND | File::CREAT))
    logdev.sync = true
    logdev

  end
end

#write(message) ⇒ void

This method returns an undefined value.

Parameters:

  • message (String) 


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# File 'lib/vedeu/logging/lockless_log_device.rb', line 31

def write(message)
  @dev.write(message)

rescue StandardError => exception
  warn("log writing failed. #{exception}".freeze)
end