/**
* Returns a cached value based on it's key
*
* This returns a cached value in the form of an object. This object will allow
* you to run an update on the value with the clause that it shouldn't be
* changed if it has changed since it was retrieved. This can be used to
* prevent race conditions.
*
* @param String $key The value to retrieve
* @return \r8\Cache\Result
*/
public function getForUpdate($key)
{
if (!$this->cache instanceof \r8\iface\Cache\Updatable) {
throw new \r8\Exception\Data($this->cache, 'Inner Cache', 'Must be an instance of \\r8\\iface\\Cache\\Updatable');
}
$result = $this->cache->getForUpdate($this->modifyKey($key));
return new \r8\Cache\Result($this, $key, $result->getHash(), $result->getValue());
}
