class VCR::Cassette

def http_interactions
  # Without this mutex, under threaded access, an HTTPInteractionList will overwrite
  # the first.
  @mutex.synchronize do
    @http_interactions ||= HTTPInteractionList.new \
      should_stub_requests? ? previously_recorded_interactions : [],
      match_requests_on,
      @allow_playback_repeats,
      @parent_list,
      log_prefix
  end
end