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: java_count_down_latch.rb
    path of file: ./repos/concurrent-ruby/lib/concurrent-ruby/concurrent/atomic
    
    the code of the file until where you have to start completion: if Concurrent.on_jruby?
  require 'concurrent/utility/native_extension_loader'

  module Concurrent

    # @!macro count_down_latch
    # @!visibility private
    # @!ma
    
      def wait(timeout = nil)
        result = nil
        if timeout.nil?
          Synchronization::JRuby.sleep_interruptibly { @latch.await }
          result = true
        else
          Synchronization::JRuby.sleep_interruptibly do
            result = @latch.await(1000 * timeout, java.util.concurrent.TimeUnit::MILLISECONDS)
          end
        end