code: public void start(String tapeName, Optional<TapeMode> mode, Optional<MatchRule> matchRule) {
          if (tape != null) {
              throw new IllegalStateException("start called when Recorder is already started");
          }
  
          tape = getTapeLoader().loadTape(tapeName);
          tape.setMode(mode.or(configuration.getDefaultMode()));
          tape.setMatchRule(matchRule.or(configuration.getDefaultMatchRule()));
  
          for (RecorderListener listener : listeners) {
              listener.onRecorderStart(tape);
          }
      }
docs: Starts the Recorder, inserting a tape with the specified parameters.
  
  @param tapeName the name of the tape.
  @param mode the tape mode. If not supplied the default mode from the configuration is used.
  @param matchRule the rules used to match recordings on the tape. If not supplied a default is used.
  
  @throws IllegalStateException if the Recorder is already started.