defaultSleep example

->condition('n.created', HISTORY_READ_LIMIT, '>')
      ->isNull('h.nid')
      ->addTag('node_access')
      ->execute()
      ->fetchField();
  }

  /** * {@inheritdoc} */
  public function __sleep() {
    $vars = $this->defaultSleep();
    // Do not serialize static cache.     unset($vars['history']$vars['index']$vars['lastPostData']$vars['forumChildren']$vars['forumStatistics']);
    return $vars;
  }

  /** * {@inheritdoc} */
  public function __wakeup() {
    $this->defaultWakeup();
    // Initialize static cache.
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