/**
* Adds the commands needed for the increment function
*
* @param MultiExecContext $multi A MultiExecContext instance
* @param string $subject A unique identifier, for example a session id or an IP
* @param int $bucket Bucket
*/
private function addMultiExecIncrement(MultiExecContext $multi, $subject, $bucket)
{
// Increment the current bucket
$multi->hincrby($subject, $bucket, 1);
// Clear the buckets ahead
$multi->hdel($subject, ($bucket + 1) % $this->bucketCount)->hdel($subject, ($bucket + 2) % $this->bucketCount);
// Renew the key TTL
$multi->expire($subject, $this->subjectExpiry);
}