*/ private $cacheConfig; /** * @var ?CacheItemPoolInterface */ private $cache; /** * Gets the cached value if it is present in the cache when that is * available. * * @param mixed $k * * @return mixed */ private function getCachedValue($k) { if (is_null($this->cache)) { return null; } $key = $this->getFullCacheKey($k); if (is_null($key)) { return null; } $cacheItem = $this->cache->getItem($key); if ($cacheItem->isHit()) { return $cacheItem->get(); } } /** * Saves the value in the cache when that is available. * * @param mixed $k * @param mixed $v * @return mixed */ private function setCachedValue($k, $v) { if (is_null($this->cache)) { return null; } $key = $this->getFullCacheKey($k); if (is_null($key)) { return null; } $cacheItem = $this->cache->getItem($key); $cacheItem->set($v); $cacheItem->expiresAfter($this->cacheConfig['lifetime']); return $this->cache->save($cacheItem); } /** * @param null|string $key * @return null|string */ private function getFullCacheKey($key) { if (is_null($key)) { return null; } $key = $this->cacheConfig['prefix'] . $key; // ensure we do not have illegal characters $key = preg_replace('|[^a-zA-Z0-9_\.!]|', '', $key); // Hash keys if they exceed $maxKeyLength (defaults to 64) if ($this->maxKeyLength && strlen($key) > $this->maxKeyLength) { $key = substr(hash('sha256', $key), 0, $this->maxKeyLength); } return $key; } }