求教！开发 phpwind 插件，事务只能用 lockProcess 吗？

/**
     * 兑换奖品
     */
    public function doAwardAction() {
        $info = array();
        $info['uid'] = $this->loginUser->uid;
        $info['username'] = $this->loginUser->username;
        $info['prize_id'] = $this->getInput('prize_id', 'post');
        !$info['prize_id'] && $this->showError('奖品不存在!');
        $info['num'] = $this->getInput('num', 'post');
        $info['name'] = $this->getInput('name', 'post');
        $info['address'] = $this->getInput('address', 'post');
        if(!$info['address']){
            $this->showError('详细地址不能为空');
        }
        $info['zip'] = $this->getInput('zip', 'post');
        $info['tel'] = $this->getInput('tel', 'post');
        if (!is_numeric($info['num']) || $info['num'] <= 0) {
            $this->showError('请输入正确的兑换数量!');
        }
        //读取应用配置
        $config = Wekit::C('weibojifen');
        //获取流通货币的名字，单位，以及该用户的值
        Wind::import('SRV:credit.bo.PwCreditBo');
        $creditBo = PwCreditBo::getInstance();
        $credit_num = $config['prizeCredit'];
        $credit_name = $creditBo->cType[$credit_num];
        $credit_unit = $creditBo->cUnit[$credit_num];
        $credit_value = $this->loginUser->info['credit'.$credit_num];
        //得到奖品信息
        $prize_info = $this->_getPrizeDs()->getPrizeInfo($info['prize_id']);
        $needpay = $prize_info['price'] * $info['num'];
        $needpay = intval($needpay);
        if (empty($prize_info)){
            $this->showError('非法 id');
        }
        if ($prize_info['num'] < 1){
            $this->showError('该奖品暂时缺货!');
        }
        if ($prize_info['num'] < $info['num']) {
            $this->showError("该奖品只剩下存货".$prize_info['num']."件!");
        }
        if ($credit_value < $needpay) {
            $this->showError('您没有足够的积分参与该奖品的兑换!');
        }
        //生成订单
        $info['price'] = $prize_info['price'];
        $info['state'] = 0;
        $info['create_time'] = Pw::getTime();
        $info['logistics'] = '';
        $info['logistics_id'] = '';
        $info['send_time'] = 0;

        $_flag = 'add_order';
        $_time = 300;
        $servce = Wekit::load('process.srv.PwProcessService');
        if ($servce->lockProcess($_flag, $_time)){
            //积分操作
            $creditBo->set($this->loginUser->uid, $config['prizeCredit'], -$needpay);
            $creditBo->addLog('积分兑换', array($credit_num => -$needpay), new PwUserBo($this->loginUser->uid));
            $creditBo->writeLog();
            //增加订单
            $this->_getOrderDs()->addOrderInfo($info);
            //减少奖品数目
            $this->_getPrizeDs()->updatePrizeNum($info['prize_id'], array('num'=>num-$info['num'],'sellnum'=>sellnum+$info['num']));
            $servce->unlockProcess($_flag);
            $this->showMessage("积分兑换奖品成功！");
        }else{
            $this->showError('未解锁状态');
        }
    }