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电商项目mall学习(7)Springboot+RabbitMQ

2020-06-26  本文已影响0人  xywh

参考链接

http://www.macrozheng.com/#/architect/mall_arch_09

使用框架

1.RabbitMQ

RabbitMQ是一个被广泛使用的开源消息队列。它是轻量级且易于部署的,它能支持多种消息协议。RabbitMQ可以部署在分布式和联合配置中,以满足高规模、高可用性的需求。
使用docker安装RabbitMQ
https://www.jianshu.com/p/7b39d33e674c

业务场景

用于解决用户下单以后,订单超时如何取消订单的问题

  • 用户进行下单操作(会有锁定商品库存、使用优惠券、积分一系列的操作);
  • 生成订单,获取订单的id;
  • 获取到设置的订单超时时间(假设设置的为60分钟不支付取消订单);
  • 按订单超时时间发送一个延迟消息给RabbitMQ,让它在订单超时后触发取消订单的操作;
  • 如果用户没有支付,进行取消订单操作(释放锁定商品库存、返还优惠券、返回积分一系列操作)。

Springboot中引入Rabbitmq实现延迟消息

1.项目中引入rabbitmq依赖,修改pom.xml

<!--消息队列相关依赖-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

2.修改springboot配置,application.yml增加rabbitmq相关配置,添加在spring节点下

  rabbitmq:
    host: 192.168.1.150# rabbitmq的连接地址
    port: 5672 # rabbitmq的连接端口号
    virtual-host: /mall # rabbitmq的虚拟host
    username: mall # rabbitmq的用户名
    password: mall # rabbitmq的密码
    publisher-confirms: true #如果对异步消息需要回调必须设置为true

3.添加消息队列的配置类,定义为枚举类型QueueEnum

用于延迟消息队列及处理取消订单消息队列的常量定义,包括交换机名称、队列名称、路由键名称

package com.mall.mallmybatis.dto;

/**
 * 消息队列枚举配置
 * @author wangxing
 * @version 2020/6/25 13:17 Administrator
 */
public enum QueueEnum {
    /**
     * 消息通知队列
     * mall.order.direct(取消订单消息队列所绑定的交换机):
     * 绑定的队列为mall.order.cancel,一旦有消息以mall.order.cancel为路由键发过来,会发送到此队列。
     */
    QUEUE_ORDER_CANCEL("mall.order.direct", "mall.order.cancel", "mall.order.cancel"),
    /**
     * 消息通知ttl队列
     * mall.order.direct.ttl(订单延迟消息队列所绑定的交换机):
     * 绑定的队列为mall.order.cancel.ttl,一旦有消息以mall.order.cancel.ttl为路由键发送过来,会转发到此队列,
     * 并在此队列保存一定时间,等到超时后会自动将消息发送到mall.order.cancel(取消订单消息消费队列)。
     */
    QUEUE_TTL_ORDER_CANCEL("mall.order.direct.ttl", "mall.order.cancel.ttl", "mall.order.cancel.ttl");
    /**
     * 交换名称
     */
    private String exchange;
    /**
     * 队列名称
     */
    private String name;
    /**
     * 路由键
     */
    private String routeKey;

    QueueEnum(String exchange, String name, String routeKey) {
        this.exchange = exchange;
        this.name = name;
        this.routeKey = routeKey;
    }

    public String getExchange() {
        return exchange;
    }

    public String getName() {
        return name;
    }

    public String getRouteKey() {
        return routeKey;
    }
}

4.添加Rabbitmq配置类RabbitMqConfig

package com.mall.mallmybatis.config;

import com.mall.mallmybatis.dto.QueueEnum;
import org.springframework.amqp.core.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author wangxing
 * @version 2020/6/25 13:19 Administrator
 */
@Configuration
public class RabbitMqConfig {
    /**
     * 订单消息实际消费队列所绑定的交换机
     */
    @Bean
    DirectExchange orderDirect() {
        return (DirectExchange) ExchangeBuilder
                //设立直接交换机名称
                .directExchange(QueueEnum.QUEUE_ORDER_CANCEL.getExchange())
                //设立持久标记
                .durable(true)
                .build();
    }
    /**
     * 订单延迟队列队列所绑定的交换机
     */
    @Bean
    DirectExchange orderTtlDirect() {
        return (DirectExchange) ExchangeBuilder
                //设立直接交换机名称
                .directExchange(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange())
                //设立持久标记
                .durable(true)
                .build();
    }
    /**
     * 订单实际消费队列
     */
    @Bean
    public Queue orderQueue() {
        return new Queue(QueueEnum.QUEUE_ORDER_CANCEL.getName());
    }
    /**
     * 订单延迟队列(死信队列)
     */
    @Bean
    public Queue orderTtlQueue() {
        return QueueBuilder
                //创建持久队列构造器
                .durable(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getName())
                //设置持久队列参数,设置死信交换机
                /*
                在队列上指定一个Exchange,则在该队列上发生如下情况,
                1.消息被拒绝(basic.reject or basic.nack),且requeue=false
                2.消息过期而被删除(TTL)
                3.消息数量超过队列最大限制而被删除
                4.消息总大小超过队列最大限制而被删除
                就会把该消息转发到指定的这个exchange;
                同时也可以指定一个可选的x-dead-letter-routing-key,表示默认的routing-key,如果没有指定,
                则使用消息的routeing-key(也跟指定的exchange有关,如果是Fanout类型的exchange,则会转发到所有绑定到该exchange的所有队列
                */
                .withArgument("x-dead-letter-exchange", QueueEnum.QUEUE_ORDER_CANCEL.getExchange())//到期后转发的交换机
                .withArgument("x-dead-letter-routing-key", QueueEnum.QUEUE_ORDER_CANCEL.getRouteKey())//到期后转发的路由键
                .build();
    }
    /**
     * 将订单队列绑定到交换机
     */
    @Bean
    Binding orderBinding(DirectExchange orderDirect,Queue orderQueue){
        return BindingBuilder
                .bind(orderQueue)
                .to(orderDirect)
                .with(QueueEnum.QUEUE_ORDER_CANCEL.getRouteKey());
    }
    /**
     * 将订单延迟队列绑定到交换机
     */
    @Bean
    Binding orderTtlBinding(DirectExchange orderTtlDirect,Queue orderTtlQueue){
        return BindingBuilder
                .bind(orderTtlQueue)
                .to(orderTtlDirect)
                .with(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey());
    }

}

5.添加延迟消息发送者CancelOrderSender

用于向订单延迟消息队列(mall.order.cancel.ttl)里发送消息。

package com.mall.mallmybatis.componet;

import com.mall.mallmybatis.dto.QueueEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 取消订单消息的发出者
 * @author wangxing
 * @version 2020/6/25 14:59 Administrator
 */
@Component
public class CancelOrderSender {
    private static Logger LOGGER = LoggerFactory.getLogger(CancelOrderSender.class);
    @Autowired
    private AmqpTemplate amqpTemplate;
    public void sendMessage(Long orderId,final long delayTimes){
        //给延迟队列发送消息
        amqpTemplate.convertAndSend(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange(),
                QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey(), orderId, new MessagePostProcessor() {
            @Override
            public Message postProcessMessage(Message message) throws AmqpException {
                //给消息设置延迟毫秒值
                message.getMessageProperties().setExpiration(String.valueOf(delayTimes));
                return message;
            }
        });
        LOGGER.info("send delay message orderId:{}",orderId);
    }
}

6.添加OmsPortalOrderService接口定义订单部分方法[提交订单/取消订单]

package com.mall.mallmybatis.service;

import com.mall.mallmybatis.common.api.CommonResult;
import com.mall.mallmybatis.dto.OrderParam;
import org.springframework.transaction.annotation.Transactional;

/**
 * @author wangxing
 * @version 2020/6/25 18:19 Administrator
 */
public interface OmsPortalOrderService {
    /**
     * 根据提交信息生成订单
     */
    @Transactional
    CommonResult generateOrder(OrderParam orderParam);
    /**
     * 取消单个超时订单
     */
    @Transactional
    void cancelOrder(Long orderId);

}

7.添加取消订单消息的接收者CancelOrderReceiver

用于从取消订单的消息队列(mall.order.cancel)里接收消息。

package com.mall.mallmybatis.componet;

import com.mall.mallmybatis.service.OmsPortalOrderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 取消订单消息的处理者
 * @author wangxing
 * @version 2020/6/25 18:18 Administrator
 */
@Component
@RabbitListener(queues = "mall.order.cancel")//监听消息队列mall.order.cancel获取对应消息
public class CancelOrderReceiver {
    private static Logger LOGGER = LoggerFactory.getLogger(CancelOrderReceiver.class);

    @Autowired
    private OmsPortalOrderService portalOrderService;
    @RabbitHandler
    public void handle(Long orderId){
        LOGGER.info("receive delay message orderId:{}",orderId);
        portalOrderService.cancelOrder(orderId);
    }
}

8.添加OmsPortalOrderServiceImpl类,实现OmsPortalOrderService接口

package com.mall.mallmybatis.service.impl;

import com.mall.mallmybatis.common.api.CommonResult;
import com.mall.mallmybatis.componet.CancelOrderSender;
import com.mall.mallmybatis.dto.OrderParam;
import com.mall.mallmybatis.service.OmsPortalOrderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author wangxing
 * @version 2020/6/25 18:25 Administrator
 */
@Service
public class OmsPortalOrderServiceImpl implements OmsPortalOrderService {
    private static Logger LOGGER = LoggerFactory.getLogger(OmsPortalOrderServiceImpl.class);
    @Autowired
    private CancelOrderSender cancelOrderSender;
    /**
     * 根据提交信息生成订单
     *
     * @param orderParam
     */
    @Override
    public CommonResult generateOrder(OrderParam orderParam) {
        //todo 执行一系类下单操作,具体参考mall项目
        LOGGER.info("process generateOrder");
        //下单完成后开启一个延迟消息,用于当用户没有付款时取消订单(orderId应该在下单后生成)
        sendDelayMessageCancelOrder(11L);
        return CommonResult.success(null, "下单成功");
    }

    /**
     * 取消单个超时订单
     *
     * @param orderId
     */
    @Override
    public void cancelOrder(Long orderId) {
        //todo 执行一系类取消订单操作,具体参考mall项目
        LOGGER.info("process cancelOrder orderId:{}",orderId);
    }

    /**
     * 订单超时时间,假设为10分钟
     * 10 * 60 * 1000
     */
    private Long DELAY_TIME = 600000L;
    private void sendDelayMessageCancelOrder(Long orderId) {
        //发送延迟消息
        cancelOrderSender.sendMessage(orderId, DELAY_TIME);
    }
}

9.添加OmsPortalOrderController定义外界访问接口

package com.mall.mallmybatis.controller;

import com.mall.mallmybatis.dto.OrderParam;
import com.mall.mallmybatis.service.OmsPortalOrderService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author wangxing
 * @version 2020/6/25 18:26 Administrator
 */
@Controller
@Api(tags = "OmsPortalOrderController", description = "订单管理")
@RequestMapping("/order")
public class OmsPortalOrderController {
    @Autowired
    private OmsPortalOrderService portalOrderService;

    @ApiOperation("根据购物车信息生成订单")
    @RequestMapping(value = "/generateOrder", method = RequestMethod.POST)
    @ResponseBody
    public Object generateOrder(@RequestBody OrderParam orderParam) {
        return portalOrderService.generateOrder(orderParam);
    }
}

进入SwaggerUI进行测试接口

启动项目
访问http://192.168.1.2:8080/swagger-ui.html

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