prefetch

# File lib/rubygems/resolver/api_set.rb, line 61
  def prefetch reqs
    return unless @remote
    names = reqs.map { |r| r.dependency.name }
    needed = names - @data.keys

    return if needed.empty?

    uri = @dep_uri + "?gems=#{needed.sort.join ','}"
    str = Gem::RemoteFetcher.fetcher.fetch_path uri

    loaded = []

    Marshal.load(str).each do |ver|
      name = ver[:name]

      @data[name] << ver
      loaded << name
    end

    (needed - loaded).each do |missing|
      @data[missing] = []
    end
  end