摘抄自简书:https://www.jianshu.com/p/9feddd4af8ee

RabbitMQ是目前主流的消息中间件，非常适用于高并发环境。各大互联网公司都在使用的MQ技术，晋级技术骨干、团队核心的必备技术！

谈到消息的可靠性投递，无法避免的，在实际的工作中会经常碰到，比如一些核心业务需要保障消息不丢失，接下来我们看一个可靠性投递的流程图，说明可靠性投递的概念：

• Step 1： 首先把消息信息(业务数据）存储到数据库中，紧接着，我们再把这个消息记录也存储到一张消息记录表里（或者另外一个同源数据库的消息记录表）
• Step 2：发送消息到MQ Broker节点（采用confirm方式发送，会有异步的返回结果）
• Step 3、4：生产者端接受MQ Broker节点返回的Confirm确认消息结果，然后进行更新消息记录表里的消息状态。比如默认Status = 0 当收到消息确认成功后，更新为1即可！
• Step 5：但是在消息确认这个过程中可能由于网络闪断、MQ Broker端异常等原因导致 回送消息失败或者异常。这个时候就需要发送方（生产者）对消息进行可靠性投递了，保障消息不丢失，100%的投递成功！（有一种极限情况是闪断，Broker返回的成功确认消息，但是生产端由于网络闪断没收到，这个时候重新投递可能会造成消息重复，需要消费端去做幂等处理）所以我们需要有一个定时任务，（比如每5分钟拉取一下处于中间状态的消息，当然这个消息可以设置一个超时时间，比如超过1分钟 Status = 0 ，也就说明了1分钟这个时间窗口内，我们的消息没有被确认，那么会被定时任务拉取出来）
• Step 6：接下来我们把中间状态的消息进行重新投递 retry send，继续发送消息到MQ ，当然也可能有多种原因导致发送失败
• Step 7：我们可以采用设置最大努力尝试次数，比如投递了3次，还是失败，那么我们可以将最终状态设置为Status = 2 ，最后 交由人工解决处理此类问题（或者把消息转储到失败表中）。
  接下来，我们使用SpringBoot2.x实现这一可靠性投递策略：

废话不多说，直接上代码：

数据库库表结构：订单表和消息记录表

-- 表 order 订单结构
CREATE TABLE IF NOT EXISTS `t_order` (
  `id` varchar(128) NOT NULL, -- 订单ID
  `name` varchar(128), -- 订单名称 其他业务熟悉忽略
  `message_id` varchar(128) NOT NULL, -- 消息唯一ID
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- 表 broker_message_log 消息记录结构
CREATE TABLE IF NOT EXISTS `broker_message_log` (
  `message_id` varchar(128) NOT NULL, -- 消息唯一ID
  `message` varchar(4000) DEFAULT NULL, -- 消息内容
  `try_count` int(4) DEFAULT ‘0‘, -- 重试次数
  `status` varchar(10) DEFAULT ‘‘, -- 消息投递状态  0 投递中 1 投递成功   2 投递失败
  `next_retry` timestamp NOT NULL DEFAULT ‘0000-00-00 00:00:00‘,  -- 下一次重试时间 或 超时时间
  `create_time` timestamp NOT NULL DEFAULT ‘0000-00-00 00:00:00‘, -- 创建时间
  `update_time` timestamp NOT NULL DEFAULT ‘0000-00-00 00:00:00‘, -- 更新时间
  PRIMARY KEY (`message_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

整合SpringBoot实现生产端代码如下：

修改 pom.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.bfxy</groupId>
    <artifactId>rabbitmq-springboot-producer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>rabbitmq-springboot-producer</name>
    <description>rabbitmq-springboot-producer</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency> 

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>        

        <!-- 添加JDBC jar -->
        <dependency>
          <groupId>org.mybatis.spring.boot</groupId>
          <artifactId>mybatis-spring-boot-starter</artifactId>
          <version>1.1.1</version>
        </dependency>
        <dependency>
          <groupId>tk.mybatis</groupId>
          <artifactId>mapper-spring-boot-starter</artifactId>
          <version>1.1.0</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.24</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- mybatis分页插件 -->
        <dependency>
            <groupId>com.github.miemiedev</groupId>
            <artifactId>mybatis-paginator</artifactId>
            <version>1.2.17</version>
            <exclusions>
                <exclusion>
                     <groupId>org.mybatis</groupId>
                    <artifactId>mybatis</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.26</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
                <dependency>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                    <version>1.2.17</version>
                </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.properties配置：

spring.rabbitmq.addresses=192.168.11.76:5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.virtual-host=/
spring.rabbitmq.connection-timeout=15000

spring.rabbitmq.publisher-confirms=true
spring.rabbitmq.publisher-returns=true
spring.rabbitmq.template.mandatory=true

server.servlet.context-path=/
server.port=8001

spring.http.encoding.charset=UTF-8
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
spring.jackson.time-zone=GMT+8
spring.jackson.default-property-inclusion=NON_NULL

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8&autoReconnect=true&zeroDateTimeBehavior=convertToNull&useUnicode=true
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root

mybatis.type-aliases-package=com.bfxy.springboot
mybatis.mapper-locations=classpath:com/bfxy/springboot/mapping/*.xml

logging.level.tk.mybatis=TRACE

数据源druid.properties配置

##下面为连接池的补充设置，应用到上面所有数据源中
#初始化大小，最小，最大
druid.initialSize=5
druid.minIdle=10
druid.maxActive=300
#配置获取连接等待超时的时间
druid.maxWait=60000
#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
druid.timeBetweenEvictionRunsMillis=60000
#配置一个连接在池中最小生存的时间，单位是毫秒
druid.minEvictableIdleTimeMillis=300000
druid.validationQuery=SELECT 1 FROM DUAL
druid.testWhileIdle=true
druid.testOnBorrow=false
druid.testOnReturn=false
#打开PSCache，并且指定每个连接上PSCache的大小
druid.poolPreparedStatements=true
druid.maxPoolPreparedStatementPerConnectionSize=20
#配置监控统计拦截的filters，去掉后监控界面sql无法统计，‘wall‘用于防火墙
druid.filters=stat,wall,log4j
#通过connectProperties属性来打开mergeSql功能；慢SQL记录
druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
#合并多个DruidDataSource的监控数据
druid.useGlobalDataSourceStat=true

Entity

Order

package com.bfxy.springboot.entity;

import java.io.Serializable;

public class Order implements Serializable {

    private static final long serialVersionUID = 9111357402963030257L;

    private String id;

    private String name;

    private String messageId;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id == null ? null : id.trim();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

    public String getMessageId() {
        return messageId;
    }

    public void setMessageId(String messageId) {
        this.messageId = messageId == null ? null : messageId.trim();
    }
}

BrokerMessageLog

package com.bfxy.springboot.entity;

import java.util.Date;

public class BrokerMessageLog {
    private String messageId;

    private String message;

    private Integer tryCount;

    private String status;

    private Date nextRetry;

    private Date createTime;

    private Date updateTime;

    public String getMessageId() {
        return messageId;
    }

    public void setMessageId(String messageId) {
        this.messageId = messageId == null ? null : messageId.trim();
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message == null ? null : message.trim();
    }

    public Integer getTryCount() {
        return tryCount;
    }

    public void setTryCount(Integer tryCount) {
        this.tryCount = tryCount;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status == null ? null : status.trim();
    }

    public Date getNextRetry() {
        return nextRetry;
    }

    public void setNextRetry(Date nextRetry) {
        this.nextRetry = nextRetry;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public Date getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }
}

实体类可以使用Lombok插件进行修改

数据库连接池代码

package com.bfxy.springboot.config.database;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import com.alibaba.druid.pool.DruidDataSource; 

@Configuration
@EnableTransactionManagement
public class DruidDataSourceConfig {

    private static Logger logger = LoggerFactory.getLogger(DruidDataSourceConfig.class);

    @Autowired
    private DruidDataSourceSettings druidSettings;

    public static String DRIVER_CLASSNAME ;

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertyConfigure(){
        return new PropertySourcesPlaceholderConfigurer();
    }    

    @Bean
    public DataSource dataSource() throws SQLException {
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(druidSettings.getDriverClassName());
        DRIVER_CLASSNAME = druidSettings.getDriverClassName();
        ds.setUrl(druidSettings.getUrl());
        ds.setUsername(druidSettings.getUsername());
        ds.setPassword(druidSettings.getPassword());
        ds.setInitialSize(druidSettings.getInitialSize());
        ds.setMinIdle(druidSettings.getMinIdle());
        ds.setMaxActive(druidSettings.getMaxActive());
        ds.setTimeBetweenEvictionRunsMillis(druidSettings.getTimeBetweenEvictionRunsMillis());
        ds.setMinEvictableIdleTimeMillis(druidSettings.getMinEvictableIdleTimeMillis());
        ds.setValidationQuery(druidSettings.getValidationQuery());
        ds.setTestWhileIdle(druidSettings.isTestWhileIdle());
        ds.setTestOnBorrow(druidSettings.isTestOnBorrow());
        ds.setTestOnReturn(druidSettings.isTestOnReturn());
        ds.setPoolPreparedStatements(druidSettings.isPoolPreparedStatements());
        ds.setMaxPoolPreparedStatementPerConnectionSize(druidSettings.getMaxPoolPreparedStatementPerConnectionSize());
        ds.setFilters(druidSettings.getFilters());
        ds.setConnectionProperties(druidSettings.getConnectionProperties());
        logger.info(" druid datasource config : {} ", ds);
        return ds;
    }

    @Bean
    public PlatformTransactionManager transactionManager() throws Exception {
        DataSourceTransactionManager txManager = new DataSourceTransactionManager();
        txManager.setDataSource(dataSource());
        return txManager;
    }

}

继续

package com.bfxy.springboot.config.database;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix="spring.datasource")
@PropertySource("classpath:druid.properties")
public class DruidDataSourceSettings {

    private String driverClassName;
    private String url;
    private String username;
    private String password;

    @Value("${druid.initialSize}")
    private int initialSize;

    @Value("${druid.minIdle}")
    private int minIdle;

    @Value("${druid.maxActive}")
    private int maxActive;

    @Value("${druid.timeBetweenEvictionRunsMillis}")
    private long timeBetweenEvictionRunsMillis;

    @Value("${druid.minEvictableIdleTimeMillis}")
    private long minEvictableIdleTimeMillis;

    @Value("${druid.validationQuery}")
    private String validationQuery;

    @Value("${druid.testWhileIdle}")
    private boolean testWhileIdle;

    @Value("${druid.testOnBorrow}")
    private boolean testOnBorrow;

    @Value("${druid.testOnReturn}")
    private boolean testOnReturn;

    @Value("${druid.poolPreparedStatements}")
    private boolean poolPreparedStatements;

    @Value("${druid.maxPoolPreparedStatementPerConnectionSize}")
    private int maxPoolPreparedStatementPerConnectionSize;

    @Value("${druid.filters}")
    private String filters;

    @Value("${druid.connectionProperties}")
    private String connectionProperties;

    @Bean
    public static PropertySourcesPlaceholderConfigurer properdtyConfigure(){
        return new PropertySourcesPlaceholderConfigurer();
    }

    public String getDriverClassName() {
        return driverClassName;
    }
    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }
    public String getUrl() {
        return url;
    }
    public void setUrl(String url) {
        this.url = url;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getInitialSize() {
        return initialSize;
    }
    public void setInitialSize(int initialSize) {
        this.initialSize = initialSize;
    }
    public int getMinIdle() {
        return minIdle;
    }
    public void setMinIdle(int minIdle) {
        this.minIdle = minIdle;
    }
    public int getMaxActive() {
        return maxActive;
    }
    public void setMaxActive(int maxActive) {
        this.maxActive = maxActive;
    }
    public long getTimeBetweenEvictionRunsMillis() {
        return timeBetweenEvictionRunsMillis;
    }
    public void setTimeBetweenEvictionRunsMillis(long timeBetweenEvictionRunsMillis) {
        this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
    }
    public long getMinEvictableIdleTimeMillis() {
        return minEvictableIdleTimeMillis;
    }
    public void setMinEvictableIdleTimeMillis(long minEvictableIdleTimeMillis) {
        this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
    }
    public String getValidationQuery() {
        return validationQuery;
    }
    public void setValidationQuery(String validationQuery) {
        this.validationQuery = validationQuery;
    }
    public boolean isTestWhileIdle() {
        return testWhileIdle;
    }
    public void setTestWhileIdle(boolean testWhileIdle) {
        this.testWhileIdle = testWhileIdle;
    }
    public boolean isTestOnBorrow() {
        return testOnBorrow;
    }
    public void setTestOnBorrow(boolean testOnBorrow) {
        this.testOnBorrow = testOnBorrow;
    }
    public boolean isTestOnReturn() {
        return testOnReturn;
    }
    public void setTestOnReturn(boolean testOnReturn) {
        this.testOnReturn = testOnReturn;
    }
    public boolean isPoolPreparedStatements() {
        return poolPreparedStatements;
    }
    public void setPoolPreparedStatements(boolean poolPreparedStatements) {
        this.poolPreparedStatements = poolPreparedStatements;
    }
    public int getMaxPoolPreparedStatementPerConnectionSize() {
        return maxPoolPreparedStatementPerConnectionSize;
    }
    public void setMaxPoolPreparedStatementPerConnectionSize(
            int maxPoolPreparedStatementPerConnectionSize) {
        this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
    }
    public String getFilters() {
        return filters;
    }
    public void setFilters(String filters) {
        this.filters = filters;
    }
    public String getConnectionProperties() {
        return connectionProperties;
    }
    public void setConnectionProperties(String connectionProperties) {
        this.connectionProperties = connectionProperties;
    }

}

定时任务配置代码：

package com.bfxy.springboot.config.task;

import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;

@Configuration
@EnableScheduling
public class TaskSchedulerConfig implements SchedulingConfigurer {

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        taskRegistrar.setScheduler(taskScheduler());
    }

    @Bean(destroyMethod="shutdown")
    public Executor taskScheduler(){
        return Executors.newScheduledThreadPool(100);
    }

}

常量类

package com.bfxy.springboot.constant;

public final class Constants {

    public static final String ORDER_SENDING = "0"; //发送中

    public static final String ORDER_SEND_SUCCESS = "1"; //成功

    public static final String ORDER_SEND_FAILURE = "2"; //失败

    public static final int ORDER_TIMEOUT = 1; /*分钟超时单位：min*/
}

消息记录表核心业务：

package com.bfxy.springboot.mapper;

import java.util.Date;

import org.apache.ibatis.annotations.Param;

import com.bfxy.springboot.entity.BrokerMessageLog;
import com.sun.tools.javac.util.List;

public interface BrokerMessageLogMapper {
    /**
     * 查询消息状态为0(发送中) 且已经超时的消息集合
     * @return
     */
    List<BrokerMessageLog> query4StatusAndTimeoutMessage();

    /**
     * 重新发送统计count发送次数 +1
     * @param messageId
     * @param updateTime
     */
    void update4ReSend(@Param("messageId")String messageId, @Param("updateTime")Date updateTime);
    /**
     * 更新最终消息发送结果 成功 or 失败
     * @param messageId
     * @param status
     * @param updateTime
     */
    void changeBrokerMessageLogStatus(@Param("messageId")String messageId, @Param("status")String status, @Param("updateTime")Date updateTime);

}

对应的SQL代码：

 <select id="query4StatusAndTimeoutMessage" resultMap="BaseResultMap">
          <![CDATA[
          select message_id, message, try_count, status, next_retry, create_time, update_time
              from broker_message_log bml
              where status = ‘0‘
              and next_retry <= sysdate()
          ]]>
    </select>

  <update id="update4ReSend" >
    update broker_message_log bml
    set bml.try_count = bml.try_count + 1,
      bml.update_time = #{updateTime, jdbcType=TIMESTAMP}
    where bml.message_id = #{messageId,jdbcType=VARCHAR}
  </update>

  <update id="changeBrokerMessageLogStatus" >
    update broker_message_log bml
    set bml.status = #{status,jdbcType=VARCHAR},
          bml.update_time = #{updateTime, jdbcType=TIMESTAMP}
    where bml.message_id = #{messageId,jdbcType=VARCHAR}
  </update>

核心发送代码：orderService

package com.bfxy.springboot.service;

import java.util.Date;

import org.apache.commons.lang3.time.DateUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.bfxy.springboot.constant.Constants;
import com.bfxy.springboot.entity.BrokerMessageLog;
import com.bfxy.springboot.entity.Order;
import com.bfxy.springboot.mapper.BrokerMessageLogMapper;
import com.bfxy.springboot.mapper.OrderMapper;
import com.bfxy.springboot.producer.RabbitOrderSender;
import com.bfxy.springboot.utils.FastJsonConvertUtil;

@Service
public class OrderService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private BrokerMessageLogMapper brokerMessageLogMapper;

    @Autowired
    private RabbitOrderSender rabbitOrderSender;

    public void createOrder(Order order) throws Exception {
        // 使用当前时间当做订单创建时间（为了模拟一下简化）
        Date orderTime = new Date();
        // 插入业务数据
        orderMapper.insert(order);
        // 插入消息记录表数据
        BrokerMessageLog brokerMessageLog = new BrokerMessageLog();
        // 消息唯一ID
        brokerMessageLog.setMessageId(order.getMessageId());
        // 保存消息整体 转为JSON 格式存储入库
        brokerMessageLog.setMessage(FastJsonConvertUtil.convertObjectToJSON(order));
         // 设置消息状态为0 表示发送中
        brokerMessageLog.setStatus("0");
         // 设置消息未确认超时时间窗口为 一分钟
        brokerMessageLog.setNextRetry(DateUtils.addMinutes(orderTime, Constants.ORDER_TIMEOUT));
        brokerMessageLog.setCreateTime(new Date());
        brokerMessageLog.setUpdateTime(new Date());
        brokerMessageLogMapper.insert(brokerMessageLog);
        // 发送消息
        rabbitOrderSender.sendOrder(order);
    }

}
MQ消息发送核心代码：

package com.bfxy.springboot.producer;

import java.util.Date;

import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.core.RabbitTemplate.ConfirmCallback;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.bfxy.springboot.constant.Constants;
import com.bfxy.springboot.entity.Order;
import com.bfxy.springboot.mapper.BrokerMessageLogMapper;
import com.bfxy.springboot.mapper.OrderMapper;

@Component
public class RabbitOrderSender {

    //自动注入RabbitTemplate模板类
    @Autowired
    private RabbitTemplate rabbitTemplate;  

    @Autowired
    private BrokerMessageLogMapper brokerMessageLogMapper;

    //回调函数: confirm确认
    final ConfirmCallback confirmCallback = new RabbitTemplate.ConfirmCallback() {
        @Override
        public void confirm(CorrelationData correlationData, boolean ack, String cause) {
            System.err.println("correlationData: " + correlationData);
            String messageId = correlationData.getId();
            if(ack){
                //如果confirm返回成功 则进行更新
                brokerMessageLogMapper.changeBrokerMessageLogStatus(messageId, Constants.ORDER_SEND_SUCCESS, new Date());
            } else {
                //失败则进行具体的后续操作:重试 或者补偿等手段
                System.err.println("异常处理...");
            }
        }
    };

    //发送消息方法调用: 构建自定义对象消息
    public void sendOrder(Order order) throws Exception {
        rabbitTemplate.setConfirmCallback(confirmCallback);
        //消息唯一ID
        CorrelationData correlationData = new CorrelationData(order.getMessage_id());
        rabbitTemplate.convertAndSend("order-exchange", "order.ABC", order, correlationData);
    }

}

消息重试、最大努力尝试策略（定时任务）：

package com.bfxy.springboot.task;

import java.util.Date;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import com.bfxy.springboot.constant.Constants;
import com.bfxy.springboot.entity.BrokerMessageLog;
import com.bfxy.springboot.entity.Order;
import com.bfxy.springboot.mapper.BrokerMessageLogMapper;
import com.bfxy.springboot.producer.RabbitOrderSender;
import com.bfxy.springboot.utils.FastJsonConvertUtil;

@Component
public class RetryMessageTasker {

    @Autowired
    private RabbitOrderSender rabbitOrderSender;

    @Autowired
    private BrokerMessageLogMapper brokerMessageLogMapper;

    @Scheduled(initialDelay = 5000, fixedDelay = 10000)
    public void reSend(){
        //pull status = 0 and timeout message
        List<BrokerMessageLog> list = brokerMessageLogMapper.query4StatusAndTimeoutMessage();
        list.forEach(messageLog -> {
            if(messageLog.getTryCount() >= 3){
                //update fail message
                brokerMessageLogMapper.changeBrokerMessageLogStatus(messageLog.getMessageId(), Constants.ORDER_SEND_FAILURE, new Date());
            } else {
                // resend
                brokerMessageLogMapper.update4ReSend(messageLog.getMessageId(),  new Date());
                Order reSendOrder = FastJsonConvertUtil.convertJSONToObject(messageLog.getMessage(), Order.class);
                try {
                    rabbitOrderSender.sendOrder(reSendOrder);
                } catch (Exception e) {
                    e.printStackTrace();
                    System.err.println("-----------异常处理-----------");
                }
            }
        });
    }
}

测试订单发送

代码如下

 @Autowired
    private RabbitOrderSender rabbitOrderSender;

    @Test
    public void testSender2() throws Exception {
         Order order = new Order();
         order.setId("2018080400000001");
         order.setName("测试订单");
         order.setMessage_id(System.currentTimeMillis() + "$" + UUID.randomUUID().toString());
         rabbitOrderSender.sendOrder(order);
    }

监控台查看消息

发送成功！ 现在测试 发送订单并且入库（业务库和消息记录库）

 @Autowired
    private OrderService orderService;

    @Test
    public void testCreateOrder() throws Exception {
         Order order = new Order();
         order.setId("2018080400000002");
         order.setName("测试创建订单");
         order.setMessageId(System.currentTimeMillis() + "$" + UUID.randomUUID().toString());
        orderService.createOrder(order);
    }

• 发送成功 并且入库OK:业务表 和 消息记录表均有数据 且status状态=1 为成功！
• 业务表：

  

• 消息记录表

  

• 测试失败情况：修改路由KEY为 无法路由即可！

  

• 这样消息就算失败的情况了。然后ACK的时候就会走异常处理，消息记录表如下：

  

• 最后我们测试重试策略：直接启动生产者应用，开启定时任务，重试几次后，库表信息变化如下:

  

• 最终重试3次 失败结果更新 status = 2

1人点赞

JaveEE

作者：__method__
链接：https://www.jianshu.com/p/9feddd4af8ee
来源：简书
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原文地址：https://www.cnblogs.com/shujiying/p/12697577.html