function ThemeRegistry::updateCache

Overrides CacheCollector::updateCache

File

core/lib/Drupal/Core/Utility/ThemeRegistry.php, line 136

Class

ThemeRegistry

Builds the run-time theme registry.

Namespace

Code

protected function updateCache($lock = TRUE) {
    if (!$this->persistable) {
        return;
    }
    // @todo Is the custom implementation necessary?
    $data = [];
    foreach ($this->keysToPersist as $offset => $persist) {
        if ($persist) {
            $data[$offset] = $this->storage[$offset];
        }
    }
    if (empty($data)) {
        return;
    }
    $lock_name = $this->cid . ':' . __CLASS__;
    if (!$lock || $this->lock
        ->acquire($lock_name)) {
        if ($cached = $this->cache
            ->get($this->cid)) {
            // Use array merge instead of union so that filled in values in $data
            // overwrite empty values in the current cache.
            $data = array_merge($cached->data, $data);
        }
        else {
            $registry = $this->initializeRegistry();
            $data = array_merge($registry, $data);
        }
        $this->cache
            ->set($this->cid, $data, Cache::PERMANENT, $this->tags);
        if ($lock) {
            $this->lock
                ->release($lock_name);
        }
    }
}