java乐观锁原理与实现案例分析

/**
 * 自动派单
 * 只查出一条  返回list只是为了和查询接口统一
 * 视频审核订单不派送
 * @param paramMap
 * @return
 */
public List<AutomaticAssignDto> automaticAssign(Map<String, Object> paramMap){
    //派送规则
    String changeSortSet = RedisCacheUtil.getValue(CACHE_TYPE.APP, "changeSortSet");
    if (StringUtils.isBlank(changeSortSet)) {
        changeSortSet = customerManager.getDictionaryByCode("changeSortSet");
        if (StringUtils.isNotBlank(changeSortSet)) {
            RedisCacheUtil.addValue(CACHE_TYPE.APP, "changeSortSet", changeSortSet,30,TimeUnit.DAYS);
        } else {
            changeSortSet = ConstantsUtil.AssignRule.FIFO; // 默认先进先审
        }
    }
    AutomaticAssignDto automaticAssignDto = new AutomaticAssignDto();
    automaticAssignDto.setChangeSortSet(changeSortSet);
    automaticAssignDto.setUserTeam(CommonUtils.getValue(paramMap, "userTeam"));
    List<AutomaticAssignDto> waitCheckList = automaticAssignMybatisDao.automaticAssignOrder(automaticAssignDto);
    if(waitCheckList != null && waitCheckList.size()>0){
        automaticAssignDto = waitCheckList.get(0);
        automaticAssignDto.setSendStatus(ConstantsUtil.SendStatus.SEND);
        automaticAssignDto.setBindTime(new Date());
        automaticAssignDto.setUserId(Long.parseLong(paramMap.get("userId").toString()) );
        int sum = automaticAssignMybatisDao.bindAutomaticAssignInfo(automaticAssignDto);
        if(sum == 1){
            return waitCheckList;
        }else{
            //已被更新 则再次获取
            return automaticAssign(paramMap);
        }
    }else{
        return null;
    }
}

<update id="bindAutomaticAssignInfo" parameterType="com.star.manager.dto.apply.AutomaticAssignDto">
  UPDATE t_automatic_assign 
  SET 
        SEND_STATUS = #{sendStatus} ,
        BIND_TIME = SYSDATE() ,
        LOCKED_FINISHTIME = SYSDATE(),
        USER_ID = #{userId} ,
        VERSION = VERSION + 1, 
        UPDATE_DATE = SYSDATE()
  WHERE    SLT_ACCOUNT_ID = #{sltAccountId} 
            AND VERSION = #{version}
</update>