You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: quoted_cache.rb
    path of file: ./repos/activerecord-jdbc-adapter/lib/arjdbc/util
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module ArJdbc
  module Util
    # Caches table and column name (quoted) outcomes.
    # Uses {ThreadSafe::Cache} as a concurrent lock free (on JRuby) 
    
      def self.included(base)
        # the thread_safe gem is an ActiveSupport dependency (since 4.0) :
        begin; require 'thread_safe'; rescue LoadError; end unless DISABLED
        if ! DISABLED && defined? ThreadSafe::Cache
          base.const_set :QUOTED_TABLE_NAMES, ThreadSafe::Cache.new
          base.const_set :QUOTED_COLUMN_NAMES, ThreadSafe::Cache.new
        else
          base.const_set :QUOTED_TABLE_NAMES, nil
          base.const_set :QUOTED_COLUMN_NAMES, nil
        end