/**
* {@inheritdoc }
*/
public function set($key, $value, $ttl = null)
{
$tKey = $this->getKey($key);
$tValue = $this->pack($value);
if (!$ttl) {
$ttl = $this->ttl;
}
$item = array('_id' => $tKey, 'value' => $tValue, 'ttl' => $this->getTtl($ttl));
$this->collection->update(array('_id' => $tKey), $item, array('upsert' => true));
}
