private function getConnectionInternal(CommandInterface $command)
    {
        if (!$this->current) {
            if ($this->strategy->isReadOperation($command) && $slave = $this->pickSlave()) {
                $this->current = $slave;
            } else {
                $this->current = $this->getMaster();
            }

            return $this->current;
        }

        if ($this->current === $this->master) {
            return $this->current;
        }

        if (!$this->strategy->isReadOperation($command)) {
            $this->current = $this->getMaster();
        }

        return $this->current;
    }