/**
* {@inheritdoc}
*/
public function getCacheTags()
{
// The theme-specific cache tag is set automatically for each block, but the
// output of this block also depends on the global theme settings.
$tags = array('theme_global_setting' => TRUE);
return NestedArray::mergeDeep(parent::getCacheTags(), $tags);
}
/**
* {@inheritdoc}
*/
public function getCacheTags()
{
// Even when the menu block renders to the empty string for a user, we want
// the cache tag for this menu to be set: whenever the menu is changed, this
// menu block must also be re-rendered for that user, because maybe a menu
// link that is accessible for that user has been added.
$tags = array('menu' => array($this->getDerivativeId()));
return NestedArray::mergeDeep(parent::getCacheTags(), $tags);
}
/**
* {@inheritdoc}
*/
public function getCacheTags()
{
$cache_tags = parent::getCacheTags();
$feed = $this->feedStorage->load($this->configuration['feed']);
$cache_tags = NestedArray::mergeDeep($cache_tags, $feed->getCacheTag());
return $cache_tags;
}
