class Bundler::Fetcher::CompactIndex

def compact_index_client
  @compact_index_client ||= begin
    compact_fetcher = lambda do |path, headers|
      downloader.fetch(fetch_uri + path, headers)
    end
    SharedHelpers.filesystem_access(cache_path) do
      CompactIndexClient.new(cache_path, compact_fetcher)
    end.tap do |client|
      client.in_parallel = lambda do |inputs, &blk|
        func = lambda {|object, _index| blk.call(object) }
        worker_name = "Compact Index (#{display_uri.host})"
        worker = Bundler::Worker.new(25, worker_name, func)
        inputs.each {|input| worker.enq(input) }
        inputs.map { worker.deq }
      end
    end
  end
end