* so.
   */
  @GuardedBy("this")
  private void update(int len) throws IOException {
    if (memory != null && (memory.getCount() + len > fileThreshold)) {
      File temp = TempFileCreator.INSTANCE.createTempFile("FileBackedOutputStream");
      if (resetOnFinalize) {
        // Finalizers are not guaranteed to be called on system shutdown;
        // this is insurance.
        temp.deleteOnExit();
      }
      try {