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');  }  }