protected function _rpcPostProcess($status, $response)
    {
        if ($this->_affinity) {
            $command = $this->_affinity['command'];
            if ($command == self::BIND) {
                if ($status->code != \Grpc\STATUS_OK) {
                    return;
                }
                $affinity_key = $this->getAffinityKeyFromProto($response);
                $this->gcp_channel->bind($this->channel_ref, $affinity_key);
            } elseif ($command == self::UNBIND) {
                $this->gcp_channel->unbind($this->affinity_key);
            }
        }
        $this->channel_ref->activeStreamRefDecr();
    }