分布式事务太繁琐?官方推荐 Atomikos,5 分钟帮你搞定

发布于: 18 小时前

互联网应用架构:专注编程教学,架构,JAVA,Python,微服务,机器学习等领域,欢迎关注,一起学习。





前言

最近有个项目,里面涉及到多个数据源的操作,按照以前的做法采用MQ来做最终一致性,但是又觉得繁琐些,项目的量能其实也不大很小,想来想去最终采用Atomikos来实现。



XA是啥

在做Atomikos之前,我们先来了解一下什么是XA。XA是由X/Open组织提出的分布式事务的一种协议(或者称之为分布式架构)。它主要定义了两部分的管理器,全局事务管理器及资源管理器。在XA的设计理念中,把不同资源纳入到一个事务管理器进行统一管理,例如数据库资源,消息中间件资源等,从而进行全部资源的事务提交或者取消,目前主流的数据库,消息中间件都支持XA协议。





JTA又是啥

上面讲完XA协议,我们来聊聊JTA,JTA叫做Java Transaction API,它是XA协议的JAVA实现。目前在JAVA里面,关于JTA的定义主要是两部分



1、事务管理器接口-----javax.transaction.TransactionManager



2、资源管理器接口-----javax.transaction.xa.XAResource



在一般应用采用JTA接口实现事务,需要一个外置的JTA容器来存储这些事务,像Tomcat。今天我们要讲的是Atomikos,它是一个独立实现了JTA的框架,能够在我们的应用服务器中运行JTA事务。



接下来我们直接进入到主题,在一个微服务应用中,针对多数据源的时候如何实现分布式事务。





基础包引入

<?xml version="1.0"?>
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.boots</groupId>
<artifactId>boots</artifactId>
<version>3.0.0.RELEASE</version>
</parent>
<artifactId>boots-atomikos</artifactId>
<name>boots-atomikos</name>
<description>分布式事务</description>
<dependencies>

<!-- jta-atomikos 分布式事务管理 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jta-atomikos</artifactId>
</dependency>

<!-- 公共组件:swagger服务+入参出参+统一异常拦截 -->
<dependency>
<groupId>com.boots</groupId>
<artifactId>module-boots-api</artifactId>
<version>${parent.version}</version>
</dependency>

<!--springboot与mybatis整合 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.4</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.2</version>
</dependency>

<!--阿里druid数据量连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.21</version>
</dependency>

<!--数据库连接驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

<!-- mybatisplus配置 -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.2</version>
</dependency>

<!-- 采用p6spy做SQL代理 -->
<dependency>
<groupId>p6spy</groupId>
<artifactId>p6spy</artifactId>
<version>3.9.0</version>
</dependency>

<!-- 用于敏感信息加密 -->
<dependency>
<groupId>com.github.ulisesbocchio</groupId>
<artifactId>jasypt-spring-boot-starter</artifactId>
<version>3.0.2</version>
</dependency>

<dependency>
<groupId> org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-launcher</artifactId>
<scope>test</scope>
</dependency>



</dependencies>
</project>




配置第一个数据源

/**
* All rights Reserved, Designed By 林溪
* Copyright: Copyright(C) 2016-2020
*/

package com.boots.atomikos.common.config;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.jta.atomikos.AtomikosDataSourceBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.boots.atomikos.common.constants.AtomikosConstant;
import com.boots.atomikos.common.data.FirstDbData;
import com.boots.atomikos.common.utils.JasyptUtils;
import com.mysql.cj.jdbc.MysqlXADataSource;

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;

/**
* 第一数据源配置
* @author:林溪
* @date:2020年11月19日
*/
@Configuration
@MapperScan(basePackages = AtomikosConstant.FIRST_DAO, sqlSessionFactoryRef = AtomikosConstant.FIRST_SESSIONFACTORY)
@Slf4j
public class FirstDataSourceConfig {

@Autowired
private FirstDbData firstDbData;

/**
* first数据源配置
* @author OprCalf
* @return DataSource
*/
@Bean(AtomikosConstant.FIRST_DATASOURCE)
@Primary
public DataSource firstDataSource() {
final MysqlXADataSource mysqlXaDataSource = new MysqlXADataSource();
mysqlXaDataSource.setUrl(firstDbData.getFirstUrl());
mysqlXaDataSource.setPassword(JasyptUtils.decryptMsg(firstDbData.getJasyptPassword(), firstDbData.getFirstPassword()));
mysqlXaDataSource.setUser(firstDbData.getFirstUsername());
final AtomikosDataSourceBean xaDataSource = new AtomikosDataSourceBean();
xaDataSource.setXaDataSource(mysqlXaDataSource);
xaDataSource.setUniqueResourceName(AtomikosConstant.FIRST_DATASOURCE);
xaDataSource.setPoolSize(firstDbData.getMaxPoolPreparedStatementPerConnectionSize());
xaDataSource.setMinPoolSize(firstDbData.getMinIdle());
xaDataSource.setMaxPoolSize(firstDbData.getMaxActive());
xaDataSource.setMaxIdleTime(firstDbData.getMinIdle());
xaDataSource.setMaxLifetime(firstDbData.getMinEvictableIdleTimeMillis());
xaDataSource.setConcurrentConnectionValidation(true);
xaDataSource.setTestQuery("select 1 from dual");
log.info("初始化第一数据库成功");
return xaDataSource;
}

/**
* 创建第一个SqlSessionFactory
* @param firstDataSource
* @return
* @throws Exception
*/
@Primary
@Bean(AtomikosConstant.FIRST_SESSIONFACTORY)
@SneakyThrows(Exception.class)
public SqlSessionFactory firstSqlSessionFactory(@Qualifier(AtomikosConstant.FIRST_DATASOURCE) DataSource firstDataSource) {
final MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
bean.setDataSource(firstDataSource);
// 设置mapper位置
bean.setTypeAliasesPackage(AtomikosConstant.FIRST_MODELS);
// 设置mapper.xml文件的路径
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(AtomikosConstant.FIRST_MAPPER));
return bean.getObject();
}

}




配置第二个数据源

/**
* All rights Reserved, Designed By 林溪
* Copyright: Copyright(C) 2016-2020
*/

package com.boots.atomikos.common.config;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.jta.atomikos.AtomikosDataSourceBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.boots.atomikos.common.constants.AtomikosConstant;
import com.boots.atomikos.common.data.SecondDbData;
import com.boots.atomikos.common.utils.JasyptUtils;
import com.mysql.cj.jdbc.MysqlXADataSource;

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;

/**
* 第二数据源配置
* @author:林溪
* @date:2020年11月19日
*/
@Configuration
@MapperScan(basePackages = AtomikosConstant.SECOND_DAO, sqlSessionFactoryRef = AtomikosConstant.SECOND_SESSIONFACTORY)
@Slf4j
public class SecondDataSourceConfig {

@Autowired
private SecondDbData secondDbData;

/**
* second数据源配置
* @author OprCalf
* @return DataSource
*/
@Bean(AtomikosConstant.SECOND_DATASOURCE)
public DataSource secondDataSource() {
// 使用mysql的分布式驱动,支持MySql5.*、MySql8.* 以上版本
final MysqlXADataSource mysqlXaDataSource = new MysqlXADataSource();
mysqlXaDataSource.setUrl(secondDbData.getSecondUrl());
mysqlXaDataSource.setPassword(JasyptUtils.decryptMsg(secondDbData.getJasyptPassword(), secondDbData.getSecondPassword()));
mysqlXaDataSource.setUser(secondDbData.getSecondUsername());
final AtomikosDataSourceBean xaDataSource = new AtomikosDataSourceBean();
xaDataSource.setXaDataSource(mysqlXaDataSource);
xaDataSource.setUniqueResourceName(AtomikosConstant.SECOND_DATASOURCE);
xaDataSource.setPoolSize(secondDbData.getMaxPoolPreparedStatementPerConnectionSize());
xaDataSource.setMinPoolSize(secondDbData.getMinIdle());
xaDataSource.setMaxPoolSize(secondDbData.getMaxActive());
xaDataSource.setMaxIdleTime(secondDbData.getMinIdle());
xaDataSource.setMaxLifetime(secondDbData.getMinEvictableIdleTimeMillis());
xaDataSource.setConcurrentConnectionValidation(true);
xaDataSource.setTestQuery("select 1 from dual");
log.info("初始化第二数据库成功");
return xaDataSource;
}

/**
* 创建第一个SqlSessionFactory
* @param secondDataSource
* @return
* @throws Exception
*/
@Bean(AtomikosConstant.SECOND_SESSIONFACTORY)
@SneakyThrows(Exception.class)
public SqlSessionFactory secondSqlSessionFactory(@Qualifier(AtomikosConstant.SECOND_DATASOURCE) DataSource secondDataSource) {
final MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
bean.setDataSource(secondDataSource);
// 设置mapper位置
bean.setTypeAliasesPackage(AtomikosConstant.SECOND_MODELS);
// 设置mapper.xml文件的路径
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(AtomikosConstant.SECOND_MAPPER));
return bean.getObject();
}

}




配置数据源管理器

/**
* All rights Reserved, Designed By 林溪
* Copyright: Copyright(C) 2016-2020
*/

package com.boots.atomikos.common.config;

import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.jta.JtaTransactionManager;

import com.atomikos.icatch.jta.UserTransactionImp;
import com.atomikos.icatch.jta.UserTransactionManager;

import lombok.SneakyThrows;

/**
* Atomikos事务管理器
* @author:林溪
* @date:2020年11月17日
*/
@Configuration
@EnableTransactionManagement
public class AtomikosConfig {

/**
* 初始化JTA事务管理器
* @author 林溪
* @return UserTransaction
*/
@Bean(name = "userTransaction")
@SneakyThrows(Exception.class)
public UserTransaction userTransaction() {
final UserTransactionImp userTransactionImp = new UserTransactionImp();
userTransactionImp.setTransactionTimeout(20000);
return userTransactionImp;
}

/**
* 初始化Atomikos事务管理器
* @author 林溪
* @return TransactionManager
*/
@Bean(name = "atomikosTransactionManager")
@SneakyThrows(Exception.class)
public TransactionManager atomikosTransactionManager() {
final UserTransactionManager userTransactionManager = new UserTransactionManager();
userTransactionManager.setForceShutdown(false);
return userTransactionManager;
}

/**
* 加载事务管理
* @author 林溪
* @param atomikosTransactionManager
* @param userTransaction
* @return PlatformTransactionManager
*/
@Bean(name = "transactionManager")
@SneakyThrows(Throwable.class)
public PlatformTransactionManager transactionManager(@Qualifier("atomikosTransactionManager") TransactionManager atomikosTransactionManager, @Qualifier("userTransaction") UserTransaction userTransaction) {
return new JtaTransactionManager(userTransaction(), atomikosTransactionManager());
}

}




配置常量

/**
* All rights Reserved, Designed By 林溪
* Copyright: Copyright(C) 2016-2020
*/

package com.boots.atomikos.common.constants;

/**
* 分布式事务常量
* @author:林溪
* @date:2020年11月16日
*/

public class AtomikosConstant {

/*****************第一数据库配置****************************/

// 数据源配置
public final static String FIRST_DATASOURCE = "firstDataSource";

// 会话工厂配置
public final static String FIRST_SESSIONFACTORY = "firstSessionFactory";

// 映射接口配置
public final static String FIRST_DAO= "com.boots.atomikos.business.afuser.dao";

// 数据对象路径
public final static String FIRST_MODELS = "com.boots.atomikos.business.afuser.model";

// 映射目录配置
public final static String FIRST_MAPPER = "classpath:mappers/AfUserMapper.xml";

/*****************第二数据库配置****************************/

// 数据源配置
public final static String SECOND_DATASOURCE = "secondDataSource";

// 会话工厂配置
public final static String SECOND_SESSIONFACTORY = "secondSessionFactory";

// 映射接口配置
public final static String SECOND_DAO= "com.boots.atomikos.business.afcustomer.dao";

// 数据对象路径
public final static String SECOND_MODELS = "com.boots.atomikos.business.afcustomer.model";

// 映射目录配置
public final static String SECOND_MAPPER = "classpath:mappers/AfCustomerMapper.xml";

}




配置信息

######配置基本信息######
##配置应用名称
spring.application.name: boots-atomikos
##配置时间格式,为了避免精度丢失,全部换成字符串
spring.jackson.timeZone: GMT+8
spring.jackson.dateFormat: yyyy-MM-dd HH:mm:ss
spring.jackson.generator.writeNumbersAsStrings: true
#####配置数据源#######
first.datasource.url: jdbc:mysql://127.0.0.1:3306/atomikos_first?autoReconnect=true&useSSL=false&characterEncoding=utf-8&serverTimezone=Asia/Shanghai&allowMultiQueries=true
first.datasource.username: root
first.datasource.password: yiOtQ2YkCWwOvRNmLI4eaPG/fx/q3AIB20JFFz87T96+udBorAm0tNxI2YKfFdeA
#####配置数据源#######
second.datasource.url: jdbc:mysql://127.0.0.1:3306/atomikos_second?autoReconnect=true&useSSL=false&characterEncoding=utf-8&serverTimezone=Asia/Shanghai&allowMultiQueries=true
second.datasource.username: root
second.datasource.password: yiOtQ2YkCWwOvRNmLI4eaPG/fx/q3AIB20JFFz87T96+udBorAm0tNxI2YKfFdeA



运行测试

我们定义了一个接口并实现该接口,定义了一个test方法,根据不同情况手动抛出异常,在运行后可以直接看到数据并没有被插入到数据中



/**
* All rights Reserved, Designed By 林溪开源
* Copyright: Copyright(C) 2016-2020
* Company 林溪开源 Ltd.
*/

package com.boots.atomikos.business.afcustomer.service.impl;

import javax.transaction.Transactional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.boots.atomikos.business.afcustomer.dao.IAfCustomerDao;
import com.boots.atomikos.business.afcustomer.model.AfCustomer;
import com.boots.atomikos.business.afcustomer.service.IAfCustomerService;
import com.boots.atomikos.business.afuser.dao.IAfUserDao;
import com.boots.atomikos.business.afuser.model.AfUser;
import com.module.boots.exception.CommonRuntimeException;

/**
* 客户表逻辑服务实现层
* @author:林溪
* @date: 2020年11月17日
*/
@Service
public class AfCustomerServiceImpl extends ServiceImpl<IAfCustomerDao, AfCustomer> implements IAfCustomerService {

@Autowired
private IAfCustomerDao afCustomerDao;

@Autowired
private IAfUserDao afUserDao;

@Override
@Transactional(rollbackOn = CommonRuntimeException.class)
public void test() {
final AfCustomer afCustomer = AfCustomer.builder().customerName("客户1").build();
final AfUser afUser = AfUser.builder().userName("用户1").build();
final int i = afCustomerDao.insert(afCustomer);
if (i > 0) {
throw new CommonRuntimeException("新增失败");
}
afUserDao.insert(afUser);
}

}




总结

实验结果测试没问题,这里就不贴出来,有兴趣的同学可以通过以下获取源码



h ttps://gitee.com/lemeno/boots



--END--



作者:@互联网应用架构



原创作品,抄袭必究



如需要源码,转发,关注后私信我



部分图片或代码来源网络,如侵权请联系删除,谢谢!



发布于: 18 小时前 阅读数: 20
用户头像

喜欢奋战在一线的架构师 2020.09.21 加入

专注架构,微服务,机器学习,JAVA,Python等领域教程,欢迎关注

评论

发布
暂无评论
分布式事务太繁琐?官方推荐Atomikos,5分钟帮你搞定