RabbitMQ(mall学习)

延迟队列

业务场景说明

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）。

在pom.xml中添加相关依赖

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

修改SpringBoot配置文件

spring:rabbitmq:host: localhost # rabbitmq的连接地址port: 5672 # rabbitmq的连接端口号virtual-host: /mall # rabbitmq的虚拟hostusername: 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

添加消息队列的枚举配置类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.macro.mall.tiny.dto;import lombok.Getter;/*** 消息队列枚举配置* Created by macro on 2018/9/14.*/
@Getter
public enum QueueEnum {/*** 消息通知队列*/QUEUE_ORDER_CANCEL("mall.order.direct", "mall.order.cancel", "mall.order.cancel"),/*** 消息通知ttl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;}
}

添加RabbitMQ的配置

用于配置交换机、队列及队列与交换机的绑定关系。

package com.macro.mall.tiny.config;import com.macro.mall.tiny.dto.QueueEnum;
import org.springframework.amqp.core.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** 消息队列配置*/
@Configuration
public class RabbitMqConfig {/*** 订单消息实际消费队列所绑定的交换机* 此处可以选择交换机的类型 direct、fanout、topic*/@BeanDirectExchange orderDirect() {return (DirectExchange) ExchangeBuilder.directExchange(QueueEnum.QUEUE_ORDER_CANCEL.getExchange()).durable(true).build();}/*** 订单延迟队列队列所绑定的交换机*/@BeanDirectExchange orderTtlDirect() {return (DirectExchange) ExchangeBuilder.directExchange(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange()).durable(true).build();}/*** 订单实际消费队列*/@Beanpublic Queue orderQueue() {return new Queue(QueueEnum.QUEUE_ORDER_CANCEL.getName());}/*** 订单延迟队列（死信队列）*/@Beanpublic Queue orderTtlQueue() {return QueueBuilder.durable(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getName()).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*/@BeanBinding 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*/@BeanBinding orderTtlBinding(DirectExchange orderTtlDirect,Queue orderTtlQueue){return BindingBuilder.bind(orderTtlQueue).to(orderTtlDirect).with(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey());}}

交换机及队列说明

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。
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）。

添加延迟消息的发送者CancelOrderSender

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

package com.macro.mall.tiny.component;import com.macro.mall.tiny.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*/
@Component
public class CancelOrderSender {private static Logger LOGGER =LoggerFactory.getLogger(CancelOrderSender.class);@Autowiredprivate 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() {@Overridepublic 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);}
}

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.macro.mall.tiny.component;import com.macro.mall.tiny.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* Created by macro on 2018/9/14.*/
@Component
@RabbitListener(queues = "mall.order.cancel")
public class CancelOrderReceiver {private static Logger LOGGER =LoggerFactory.getLogger(CancelOrderReceiver.class);@Autowiredprivate OmsPortalOrderService portalOrderService;@RabbitHandlerpublic void handle(Long orderId){LOGGER.info("receive delay message orderId:{}",orderId);portalOrderService.cancelOrder(orderId);}
}

添加OmsPortalOrderService接口

package com.macro.mall.tiny.service;import com.macro.mall.tiny.common.api.CommonResult;
import com.macro.mall.tiny.dto.OrderParam;
import org.springframework.transaction.annotation.Transactional;/*** 前台订单管理Service* Created by macro on 2018/8/30.*/
public interface OmsPortalOrderService {/*** 根据提交信息生成订单*/@TransactionalCommonResult generateOrder(OrderParam orderParam);/*** 取消单个超时订单*/@Transactionalvoid cancelOrder(Long orderId);
}

添加OmsPortalOrderService的实现类OmsPortalOrderServiceImpl

package com.macro.mall.tiny.service.impl;import com.macro.mall.tiny.common.api.CommonResult;
import com.macro.mall.tiny.component.CancelOrderSender;
import com.macro.mall.tiny.dto.OrderParam;
import com.macro.mall.tiny.service.OmsPortalOrderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;/*** 前台订单管理Service* Created by macro on 2018/8/30.*/
@Service
public class OmsPortalOrderServiceImpl implements OmsPortalOrderService {private static Logger LOGGER = LoggerFactory.getLogger(OmsPortalOrderServiceImpl.class);@Autowiredprivate CancelOrderSender cancelOrderSender;@Overridepublic 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");}@Overridepublic 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);}private void sendDelayMessageCancelOrder(Long orderId) {//获取订单超时时间，假设为60分钟long delayTimes = 30 * 1000;//发送延迟消息cancelOrderSender.sendMessage(orderId, delayTimes);}}

添加OmsPortalOrderController定义接口

package com.macro.mall.tiny.controller;import com.macro.mall.tiny.dto.OrderParam;
import com.macro.mall.tiny.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;/*** 订单管理Controller*/
@Controller
@Api(tags = "OmsPortalOrderController", description = "订单管理")
@RequestMapping("/order")
public class OmsPortalOrderController {@Autowiredprivate OmsPortalOrderService portalOrderService;@ApiOperation("根据购物车信息生成订单")@RequestMapping(value = "/generateOrder", method = RequestMethod.POST)@ResponseBodypublic Object generateOrder(@RequestBody OrderParam orderParam) {return portalOrderService.generateOrder(orderParam);}
}

Rabbitmq 插件实现延迟队列

RabbitMQ 只会检查第一个消息是否过期，如果过期则丢到死信队列，如果第一个消息的延时时长很长，而第二个消息的延时时长很短，第二个消息并不会优先得到执行。

在官网上下载 https://www.rabbitmq.com/community-plugins.html，下载
rabbitmq_delayed_message_exchange 插件，然后解压放置到 RabbitMQ 的插件目录。
进入 RabbitMQ 的安装目录下的 plgins 目录，执行下面命令让该插件生效，然后重启 RabbitMQ
/usr/lib/rabbitmq/lib/rabbitmq_server-3.8.8/plugins
rabbitmq-plugins enable rabbitmq_delayed_message_exchange

添加RabbitMQ的配置

用于配置交换机、队列及队列与交换机的绑定关系。

@Configuration
public class DelayedQueueConfig {public static final String DELAYED_QUEUE_NAME = "delayed.queue";public static final String DELAYED_EXCHANGE_NAME = "delayed.exchange";public static final String DELAYED_ROUTING_KEY = "delayed.routingkey";@Beanpublic Queue delayedQueue() {return new Queue(DELAYED_QUEUE_NAME);}//自定义交换机 我们在这里定义的是一个延迟交换机@Beanpublic CustomExchange delayedExchange() {Map<String, Object> args = new HashMap<>();//自定义交换机的类型args.put("x-delayed-type", "direct");return new CustomExchange(DELAYED_EXCHANGE_NAME, "x-delayed-message", true, false,args);}@Beanpublic Binding bindingDelayedQueue(@Qualifier("delayedQueue") Queue queue,@Qualifier("delayedExchange") CustomExchangedelayedExchange) {return BindingBuilder.bind(queue).to(delayedExchange).with(DELAYED_ROUTING_KEY).noargs();}
}

消息生产者代码

public static final String DELAYED_EXCHANGE_NAME = "delayed.exchange";
public static final String DELAYED_ROUTING_KEY = "delayed.routingkey";
@GetMapping("sendDelayMsg/{message}/{delayTime}")
public void sendMsg(@PathVariable String message,@PathVariable Integer delayTime) {rabbitTemplate.convertAndSend(DELAYED_EXCHANGE_NAME, DELAYED_ROUTING_KEY, message,correlationData ->{correlationData.getMessageProperties().setDelay(delayTime);return correlationData;});log.info(" 当 前 时 间 ： {}, 发送一条延迟 {} 毫秒的信息给队列 delayed.queue:{}", newDate(),delayTime, message);}

消息消费者代码

public static final String DELAYED_QUEUE_NAME = "delayed.queue";
@RabbitListener(queues = DELAYED_QUEUE_NAME)
public void receiveDelayedQueue(Message message){String msg = new String(message.getBody());log.info("当前时间：{},收到延时队列的消息：{}", new Date().toString(), msg);}

发起请求：

http://localhost:8080/ttl/sendDelayMsg/come on baby1/20000
http://localhost:8080/ttl/sendDelayMsg/come on baby2/2000

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RabbitMQ(mall学习)

延迟队列

Rabbitmq 插件实现延迟队列

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