From: Brian Candler <B.Candler@...>
Date: 2005-06-25T18:28:43+09:00
Subject: Re: FastCGI: handling the caching of ruby scripts.

On Fri, Jun 24, 2005 at 10:25:06PM +0900, Jonas Hartmann wrote:
> I cannot make the last example on this Page:
> http://rubygarden.org/ruby/ruby?FCGIRubyWhyArentMyChangesDisplayed 
> working yet...

Which one - the "FastCgiConfig -autoUpdate" or the Thread.new ?

Both will only work if the main application file itself has updated, not any
libraries which it 'requires'

You could write something which checks all the files in $". However, those
paths are not absolute, and each one would have to be searched against $: to
find them.

Hmm, I don't see a Ruby function to search for a file in a path (strange,
maybe I'm missing something), so this gets a bit more long-winded than I
expected:

---- 8< -----------------------------------------------------------------
#!/usr/bin/env ruby

require 'fcgi'
# ... more requires

def path_search(file, pathlist)
  return file if file[0..0] == File::SEPARATOR and File.exist?(file)
  pathlist.each do |p|
    fn = p+File::SEPARATOR+file 
    return fn if File.exist?(fn)
  end
  nil
end

Thread.new([File.expand_path(__FILE__)]) do |fname|
  old_stats = {}
  while true
    (fname+$").each do |f|
      stat = File.stat(path_search(f,$:)) rescue nil
      if stat and old_stats[f]
        exit if stat.mtime != old_stats[f].mtime or
                stat.ino != old_stats[f].ino
      end
      old_stats[f] = stat
    end
    sleep 10
  end
end

#... rest if program
---- 8< -----------------------------------------------------------------

To debug this, set "Thread.abort_on_exception=true" at the top.

I think this should work even if the number of files 'required' by the
program increases over time.

Regards,

Brian.