getMaxThread example

      // @see \Drupal\comment\CommentViewBuilder::buildComponents()       $thread = $this->getThread();
      if (empty($thread)) {
        if ($this->threadLock) {
          // Thread lock was not released after being set previously.           // This suggests there's a bug in code using this class.           throw new \LogicException('preSave() is called again without calling postSave() or releaseThreadLock()');
        }
        if (!$this->hasParentComment()) {
          // This is a comment with no parent comment (depth 0): we start           // by retrieving the maximum thread level.           $max = $storage->getMaxThread($this);
          // Strip the "/" from the end of the thread.           $max = rtrim((string) $max, '/');
          // We need to get the value at the correct depth.           $parts = explode('.', $max);
          $n = Number::alphadecimalToInt($parts[0]);
          $prefix = '';
        }
        else {
          // This is a comment with a parent comment, so increase the part of           // the thread value at the proper depth.