class Fluent::Plugin::SecondaryFileOutput

def write(chunk)
  path_without_suffix = extract_placeholders(@path_without_suffix, chunk)
  path = generate_path(path_without_suffix)
  FileUtils.mkdir_p File.dirname(path), mode: @dir_perm
  case @compress
  when :text
    File.open(path, "ab", @file_perm) {|f|
      f.flock(File::LOCK_EX)
      chunk.write_to(f)
    }
  when :gzip
    File.open(path, "ab", @file_perm) {|f|
      f.flock(File::LOCK_EX)
      gz = Zlib::GzipWriter.new(f)
      chunk.write_to(gz)
      gz.close
    }
  end
  path
end