ViewExecutable::execute

public ViewExecutable::execute($display_id = NULL)

public function execute($display_id = NULL) {
  if (empty($this->built)) {
    if (!$this->build($display_id)) {
      return FALSE;
    }
  }

  if (!empty($this->executed)) {
    return TRUE;
  }

  // Don't allow to use deactivated displays, but display them on the live preview.
  if (!$this->display_handler->isEnabled() && empty($this->live_preview)) {
    $this->build_info['fail'] = TRUE;
    return FALSE;
  }

  // Let modules modify the view just prior to executing it.
  $module_handler = \Drupal::moduleHandler();
  $module_handler->invokeAll('views_pre_execute', array($this));

  // Check for already-cached results.
  /** @var \Drupal\views\Plugin\views\cache\CachePluginBase $cache */
  if (!empty($this->live_preview)) {
    $cache = Views::pluginManager('cache')->createInstance('none');
  }
  else {
    $cache = $this->display_handler->getPlugin('cache');
  }

  if ($cache->cacheGet('results')) {
    if ($this->pager->usePager()) {
      $this->pager->total_items = $this->total_rows;
      $this->pager->updatePageInfo();
    }
  }
  else {
    $this->query->execute($this);
    // Enforce the array key rule as documented in
    // views_plugin_query::execute().
    $this->result = array_values($this->result);
    $this->_postExecute();
    $cache->cacheSet('results');
  }

  // Let modules modify the view just after executing it.
  $module_handler->invokeAll('views_post_execute', array($this));

  return $this->executed = TRUE;
}