class Lumberjack::Device

def cleanup_files!
  if keep
    files = Dir.glob("#{path}.*").collect { |f| [f, File.ctime(f)] }.sort { |a, b| b.last <=> a.last }.collect { |a| a.first }
    if files.size > keep
      files[keep, files.length].each do |f|
        File.delete(f)
      end
    end
  end
end

def close
  flush
end

def datetime_format
end

def datetime_format=(format)
end

def do_once(file)
  begin
    file.flock(File::LOCK_EX)
  rescue SystemCallError
    # Most likely can't lock file because the stream is closed
    return
  end
  begin
    verify = begin
      file.lstat
    rescue
      nil
    end
    # Execute only if the file we locked is still the same one that needed to be rolled
    yield if verify && verify.ino == @file_inode && verify.size > 0
  ensure
    begin
      file.flock(File::LOCK_UN)
    rescue
      nil
    end
  end
end

def flush
end

def reopen(logdev = nil)
  flush
end

def write(entry)
  raise NotImplementedError
end