需求描述

在挂号界面选择完需要挂号的医生和排版后，添加就诊人，确认挂号

附上业务流程图

技术分析

我们今天主要来看看这块 mq 的运用，也是一个思考，我还是挑着重要的来讲，这里讲讲我们这里怎么使用 mq 的

这里会用到两个队列

• order: 记录库存（剩余可挂号数）扣除信息，由order管理模块调用，hosp模块监听，库存（剩余可挂号数）扣除成功后，发送一条短信发送消息给msm队列
• msm：用来记录需要发送短信的信息，msm模块监听

mq 相关依赖和工具类搭建

项目模块划分如图

我们创建 rabbit_utils 模块单独存储 mq 相关操作的封装

依赖

 org.springframework.bootspring-boot-starter-actuatororg.springframework.cloudspring-cloud-starter-bus-amqpcom.alibabafastjsoncom.examplemodel0.0.1-SNAPSHOTcompile

@Configuration
public class MQConfig {@Beanpublic MessageConverter messageConverter() {return new Jackson2JsonMessageConverter();}   
}public class MqConst {/*** 预约下单*/public static final String EXCHANGE_DIRECT_ORDER = "exchange.direct.order";public static final String ROUTING_ORDER = "order";//队列public static final String QUEUE_ORDER = "queue.order";/*** 短信*/public static final String EXCHANGE_DIRECT_MSM = "exchange.direct.msm";public static final String ROUTING_MSM_ITEM = "msm.item";//队列public static final String QUEUE_MSM_ITEM = "queue.msm.item";
}@Service
@Slf4j
public class RabbitService {@Autowiredprivate RabbitTemplate rabbitTemplate;/*** 发送消息** @param exchange   交换机* @param routingKey 路由键* @param message    消息*/public boolean sendMessage(String exchange, String routingKey, Object message) {log.info("发送消息: " + exchange + routingKey + message);rabbitTemplate.convertAndSend(exchange, routingKey, message);return true;}
}

在 order, hosp, msm 这三个需要使用 mq 服务的模块中引入依赖

com.examplerabbit_utils0.0.1-SNAPSHOT

配置文件

 spring: rabbitmq:host: localhostport: 5672username: guestpassword: guest

具体方法

order 保存订单

@Overridepublic Long saveOrder(String scheduleId, Long patientId) {// 获取就诊人信息Patient patient = patientFeignClient.getPatient(patientId);// 获取排班信息ScheduleOrderVo scheduleOrderVo = hospFeignClient.getScheduleOrderVo(scheduleId);//判断当前时间是否还可以预约if (new DateTime(scheduleOrderVo.getStartTime()).isAfterNow()|| new DateTime(scheduleOrderVo.getEndTime()).isBeforeNow()) {throw new HospitalException(ResultCodeEnum.TIME_NO);}//获取签名信息SignInfoVo signInfoVo = hospFeignClient.getSignInfoVo(scheduleOrderVo.getHoscode());//把数据添加到订单表OrderInfo orderInfo = new OrderInfo();//scheduleOrderVo数据复制到orderInfoBeanUtils.copyProperties(scheduleOrderVo, orderInfo);//设置其他数据String outTradeNo = System.currentTimeMillis() + "" + new Random().nextInt(100);orderInfo.setOutTradeNo(outTradeNo);orderInfo.setScheduleId(scheduleId);orderInfo.setUserId(patient.getUserId());orderInfo.setPatientId(patientId);orderInfo.setPatientName(patient.getName());orderInfo.setPatientPhone(patient.getPhone());orderInfo.setOrderStatus(OrderStatusEnum.UNPAID.getStatus());baseMapper.insert(orderInfo);// 调用医院接口，实现预约挂号操作//设置调用医院接口所需参数，参数放到map集合中Map paramMap = new HashMap<>();paramMap.put("hoscode", orderInfo.getHoscode());paramMap.put("depcode", orderInfo.getDepcode());paramMap.put("hosScheduleId", orderInfo.getScheduleId());paramMap.put("reserveDate", new DateTime(orderInfo.getReserveDate()).toString("yyyy-MM-dd"));paramMap.put("reserveTime", orderInfo.getReserveTime().toString());paramMap.put("amount", orderInfo.getAmount().toString());paramMap.put("name", patient.getName());paramMap.put("certificatesType", patient.getCertificatesType());paramMap.put("certificatesNo", patient.getCertificatesNo());paramMap.put("sex", patient.getSex().toString());paramMap.put("birthdate", patient.getBirthdate().toString());paramMap.put("phone", patient.getPhone());paramMap.put("isMarry", patient.getIsMarry().toString());paramMap.put("provinceCode", patient.getProvinceCode());paramMap.put("cityCode", patient.getCityCode());paramMap.put("districtCode", patient.getDistrictCode());paramMap.put("address", patient.getAddress());paramMap.put("contactsName", patient.getContactsName()); //联系人paramMap.put("contactsCertificatesType", patient.getContactsCertificatesType());paramMap.put("contactsCertificatesNo", patient.getContactsCertificatesNo());paramMap.put("contactsPhone", patient.getContactsPhone());paramMap.put("timestamp", String.valueOf(HttpRequestHelper.getTimestamp()));String sign = HttpRequestHelper.getSign(paramMap, signInfoVo.getSignKey());paramMap.put("sign", sign);// 请求医院系统接口JSONObject result = HttpRequestHelper.sendRequest(paramMap, signInfoVo.getApiUrl() + "/order/submitOrder");if (result.getInteger("code") == 200) {JSONObject jsonObject = result.getJSONObject("data");//预约记录唯一标识（医院预约记录主键）String hosRecordId = jsonObject.getString("hosRecordId");//预约序号Integer number = jsonObject.getInteger("number");//取号时间String fetchTime = jsonObject.getString("fetchTime");//取号地址String fetchAddress = jsonObject.getString("fetchAddress");//更新订单orderInfo.setHosRecordId(hosRecordId);orderInfo.setNumber(number);orderInfo.setFetchTime(fetchTime);orderInfo.setFetchAddress(fetchAddress);baseMapper.updateById(orderInfo);//排班可预约数Integer reservedNumber = jsonObject.getInteger("reservedNumber");//排班剩余预约数Integer availableNumber = jsonObject.getInteger("availableNumber");// TODO  发送 mq 消息//发送mq，号源更新OrderMqVo orderMqVo = new OrderMqVo();orderMqVo.setScheduleId(scheduleId);orderMqVo.setReservedNumber(reservedNumber);orderMqVo.setAvailableNumber(availableNumber);//短信提示MsmVo msmVo = new MsmVo();msmVo.setPhone(orderInfo.getPatientPhone());String reserveDate =new DateTime(orderInfo.getReserveDate()).toString("yyyy-MM-dd")+ (orderInfo.getReserveTime() == 0 ? "上午" : "下午");Map param = new HashMap() {{put("title", orderInfo.getHosname() + "|" + orderInfo.getDepname() + "|" + orderInfo.getTitle());put("amount", orderInfo.getAmount());put("reserveDate", reserveDate);put("name", orderInfo.getPatientName());put("quitTime", new DateTime(orderInfo.getQuitTime()).toString("yyyy-MM-dd HH:mm"));}};msmVo.setParam(param);orderMqVo.setMsmVo(msmVo);// TODO 消息没发过去rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_ORDER, MqConst.ROUTING_ORDER, orderMqVo);} else {throw new HospitalException(result.getString("message"), ResultCodeEnum.FAIL.getCode());}return orderInfo.getId();}

hosp 中监听方法的实现

@Component
public class HospitalReceiver {@Autowiredprivate ScheduleService scheduleService;@Autowiredprivate RabbitService rabbitService;@RabbitListener(bindings = @QueueBinding(value = @Queue(value = MqConst.QUEUE_ORDER, durable = "true"),exchange = @Exchange(value = MqConst.EXCHANGE_DIRECT_ORDER),key = {MqConst.ROUTING_ORDER}))@RabbitHandlerpublic void receiver(OrderMqVo orderMqVo) throws IOException {//下单成功更新预约数Schedule schedule = scheduleService.getScheduleId(orderMqVo.getScheduleId());schedule.setReservedNumber(orderMqVo.getReservedNumber());schedule.setAvailableNumber(orderMqVo.getAvailableNumber());scheduleService.update(schedule);//发送短信MsmVo msmVo = orderMqVo.getMsmVo();if (null != msmVo) {rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_MSM, MqConst.ROUTING_MSM_ITEM, msmVo);}}
}

Msm 中监听

@Component
@Slf4j
public class MsmReceiver {@Autowiredprivate MsmService msmService;@RabbitListener(bindings = @QueueBinding(value = @Queue(value = MqConst.QUEUE_MSM_ITEM, durable = "true"),exchange = @Exchange(value = MqConst.EXCHANGE_DIRECT_MSM),key = {MqConst.ROUTING_MSM_ITEM}))public void send(MsmVo msmVo) {log.info("接收到消息: " + msmVo);msmService.send(msmVo);}
}

反思

做这块的功能的时候其实出现了不少问题，发现自己对于 mq 的掌握其实是不够的，虽然之前做过一个尚硅谷讲rabbitmq的笔记，但还是停留在了表面，很多问题还是需要实操，在业务场景中使用效果才是更好的，后面的学习也要注意这一点

这里其实有很多可以优化的点

• 消息可靠性投递

• 消费的幂等性

• rabbitmq集群部署

• 消息的异常处理

• 消息的堆积问题

• 替换成rocketmq来实现这块功能该怎么做

• …

需要提高的地方还不少，继续努力！