fragmented_store.rb

require "digest"
# Instead of storing cached fragments in pages/widgets/2345567/description it will instead make an MD5 of
# each fragment name and save them in directories spread evenly, with no more than 256 directories at once.
# This will prevent the filesystem from going totally medieval on you after widget 4568977 has been created and
# cached.
class FragmentedStore < ActiveSupport::Cache::FileStore
  def delete(name, options=nil)
    super(path_to_digest_tree(name), options)
  end
  
  def exist?(name)
    super(path_to_digest_tree(name))
  end
  
  def read(name, options = nil)
    super(path_to_digest_tree(name), options)
  end
  
  def write(name, value, options = nil)
    super(path_to_digest_tree(name), value, options)
  end
  
  private
    def path_to_digest_tree(name)
      Digest::MD5.hexdigest(Marshal.dump(name)).scan(/(.{2})/).join('/')
    end
end