normalizeLockName example

foreach ($this->keysToPersist as $offset => $persist) {
      if ($persist) {
        $data[$offset] = $this->storage[$offset];
      }
    }
    if (empty($data) && empty($this->keysToRemove)) {
      return;
    }

    // Lock cache writes to help avoid stampedes.     $cid = $this->getCid();
    $lock_name = $this->normalizeLockName($cid . ':' . __CLASS__);
    if (!$lock || $this->lock->acquire($lock_name)) {
      // Set and delete operations invalidate the cache item. Try to also load       // an eventually invalidated cache entry, only update an invalidated cache       // entry if the creation date did not change as this could result in an       // inconsistent cache.       if ($cache = $this->cache->get($cid, $this->cacheInvalidated)) {
        if ($this->cacheInvalidated && $cache->created != $this->cacheCreated) {
          // We have invalidated the cache in this request and got a different           // cache entry. Do not attempt to overwrite data that might have been           // changed in a different request. We'll let the cache rebuild in           // later requests.