Logger for UW Ruby Class

Logger.rb

require 'thread'
require 'resolv'

class Logger

  def initialize( infile = 'old-log.txt' , outfile = 'new-log.txt', max_threads = 3 )
    @cache        = {}
    @queue        = Queue.new
    @list         = []
    @threads      = []
    @new          = File.open( infile )
    @mutex        = Mutex.new
    @max_threads  = max_threads
    #@old         = File.open( outfile, 'w' )
  end
  
  def run
    create_queue_and_list
    load_threads_queue
    write_new_log  
  end
  
  def load_threads_queue
    until @queue.empty?
      @max_threads.times do
        unless @queue.empty?
          @threads << Thread.new do
            index           = @queue.pop
            @list[index][0] = cache(@list[index][0])
          end
        else
          break
        end
      end
      @threads.each{ |t| t.join }
      puts ">> #{@queue.size} left"
    end
  end
  
  def write_new_log
    @list.each do |line|
      puts line.join
      # Write to @old instead
    end    
  end
  
  def create_queue_and_list
    @new.each_line do |line|
      sp = line.gsub(/(^\d\S+)(.+)/) do
        @list   << [$1, $2]
        @queue  << @new.lineno - 1
      end
    end
    puts "> QUEUE has #{@queue.size} items"
  end

  def cache( ip )
    @mutex.synchronize{
      return "#{@cache[ip]} CACHED!" if @cache[ip]
      begin
        @cache[ip] = Resolv.getname( ip )
      rescue Resolv::ResolvError
        @cache[ip] = ip
      end
      return  @cache[ip]
    }
  end
end

Logger.new.run

old-log.txt

208.77.188.166 - #1 - [29/Apr/2009:16:07:38 -0700] "GET / HTTP/1.1" 200 1342
75.119.201.189 - #2 - [29/Apr/2009:16:07:44 -0700] "GET /favicon.ico HTTP/1.1" 200 1406
75.119.201.189 - #3 - [29/Apr/2009:16:09:53 -0700] "GET / HTTP/1.1" 200 1340
208.77.188.166 - #4 - [29/Apr/2009:16:11:51 -0700] "GET / HTTP/1.1" 304 -
75.119.201.189 - #5 - [29/Apr/2009:16:13:15 -0700] "GET / HTTP/1.1" 304 -
208.77.188.166 - #6 - [29/Apr/2009:16:13:15 -0700] "GET / HTTP/1.1" 304 -
75.119.201.189 - #7 - [29/Apr/2009:16:13:17 -0700] "GET / HTTP/1.1" 304 -
74.125.67.100 - #8 - [29/Apr/2009:16:13:55 -0700] "GET /stylesheets/home.css?1240264242 HTTP/1.1" 200 7829