protected boolean mustBeStarted() {
        final boolean wasStarted = traceWasStarted();
        if (!wasStarted) {
          final String errorMessage = "Code bug: .lookupStarted() must be called before. " + this;
          if (THROW_ON_INCORRECT_USAGE) {
            throw new AssertionError(errorMessage);
          }
          else {
            THROTTLED_LOG.warn(errorMessage);
          }
        }

        return wasStarted;
      }
protected boolean mustBeStarted()