/**
* Load the persistent file cache.
*/
protected function loadCache()
{
if (!isset(self::$cache)) {
$cacheDir = $this->getCacheDir();
$filename = "{$cacheDir}/cache.yml";
if (file_exists($filename) && ($raw = file_get_contents($filename))) {
$yaml = new Yaml();
self::$cache = $yaml->parse($raw);
self::$cacheAsLoaded = self::$cache;
}
}
}
