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: cache.rb
    path of file: ./repos/gitlabhq/lib/gitlab/container_repository/tags
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module ContainerRepository
    module Tags
      class Cache
        def initialize(container_repository)
          @container_repository = container_repository
          @cached_tag_names = Set.new
        end

        def populate(tags)
          return if tags.empty?

          # This will load all tags in one Redis roundtrip
          # the maximum number of tags is configurable and is set to 200 by default.
          # https://gitlab.com/gitlab-org/gitlab/blob/master/doc/user/packages/container_registry/index.md#set-cleanup-limits-to-conserve-resources
          keys = tags.map(&method(:cache_key))
          cached_tags_count = 0

          with_re
    
        def populate(tags)
          return if tags.empty?

          # This will load all tags in one Redis roundtrip
          # the maximum number of tags is configurable and is set to 200 by default.
          # https://gitlab.com/gitlab-org/gitlab/blob/master/doc/user/packages/container_registry/index.md#set-cleanup-limits-to-conserve-resources
          keys = tags.map(&method(:cache_key))
          cached_tags_count = 0

          with_redis do |redis|
            tags.zip(redis.mget(keys)).each do |tag, created_at|
              next unless created_at

              tag.created_at = DateTime.rfc3339(created_at)
              @cached_tag_names << tag.name
              cached_tags_count += 1
            end
          end

          cached_tags_count
        end