/**
* Locks a cache entry.
*
* @param string $key - Key of the cache entry to lock
*/
public function lock($key)
{
// For some weird reason, storing a simple timestamp does not work, so use prefix.
$lock_expiration = max(array(ini_get('max_execution_time'), 30));
return $this->memcached->add($this->prefix . self::LOCK_PREFIX . $key, self::LOCK_PREFIX . $this->timeNow, $lock_expiration);
}
