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Spring中使用atomikos+druid实现经典分布式事务

经典分布式事务，是相对互联网中的柔性分布式事务而言，其特性为ACID原则，包括原子性（Atomictiy）、一致性（Consistency）、隔离性（Isolation）、持久性（Durabilit）：

原子性：事务是一个包含一系列操作的原子操作。事务的原子性确保这些操作全部完成或者全部失败。
一致性：一旦事务的所有操作结束，事务就被提交。然后你的数据和资源将处于遵循业务规则的一直状态。
隔离性：因为同时在相同数据集上可能有许多事务处理，每个事务应该与其他事务隔离，避免数据破坏。
持久性：一旦事务完成，他的结果应该能够承受任何系统错误（想象一下在事务提交过程中机器的电源被切断的情况）。通常，事务的结果被写入持续性存储。

XA是啥？

XA是由X/Open组织提出的分布式事务的架构（或者叫协议）。XA架构主要定义了（全局）事务管理器（Transaction Manager）和（局部）资源管理器（Resource Manager）之间的接口。XA接口是双向的系统接口，在事务管理器（Transaction Manager）以及一个或多个资源管理器（Resource Manager）之间形成通信桥梁。也就是说，在基于XA的一个事务中，我们可以针对多个资源进行事务管理，例如一个系统访问多个数据库，或即访问数据库、又访问像消息中间件这样的资源。这样我们就能够实现在多个数据库和消息中间件直接实现全部提交、或全部取消的事务。XA规范不是java的规范，而是一种通用的规范，

目前各种数据库、以及很多消息中间件都支持XA规范。

JTA是满足XA规范的、用于Java开发的规范。所以，当我们说，使用JTA实现分布式事务的时候，其实就是说，使用JTA规范，实现系统内多个数据库、消息中间件等资源的事务。

JTA(Java Transaction API)，是J2EE的编程接口规范，它是XA协议的JAVA实现。它主要定义了：

一个事务管理器的接口javax.transaction.TransactionManager，定义了有关事务的开始、提交、撤回等>操作。
一个满足XA规范的资源定义接口javax.transaction.xa.XAResource，一种资源如果要支持JTA事务，就需要让它的资源实现该XAResource接口，并实现该接口定义的两阶段提交相关的接口。如果我们有一个应用，它使用JTA接口实现事务，应用在运行的时候，就需要一个实现JTA的容器，一般情况下，这是一个J2EE容器，像JBoss，Websphere等应用服务器。但是，也有一些独立的框架实现了JTA，例如 Atomikos, bitronix 都提供了jar包方式的JTA实现框架。这样我们就能够在Tomcat或者Jetty之类的服务器上运行使用JTA实现事务的应用系统。在上面的本地事务和外部事务的区别中说到，JTA事务是外部事务，可以用来实现对多个资源的事务性。它正是通过每个资源实现的XAResource来进行两阶段提交的控制。感兴趣的同学可以看看这个接口的方法，除了commit, rollback等方法以外，还有end(), forget(), isSameRM(), prepare()等等。光从这些接口就能够想象JTA在实现两阶段事务的复杂性。

本篇以Spring MVC+Maven+Atomikos+Druid+MyBatis演示分布式事务的实现。

Mave 的pom.xml

<properties>
	<jdk.version>1.8</jdk.version>
	<!-- 注mysql的版本和druid的版本一定要搭配，否则会有问题，目前这两个版本是搭配好的 -->
	<mysql.version>8.0.11</mysql.version>
	<druid.version>1.1.17</druid.version>
	<spring.version>5.1.8.RELEASE</spring.version>
	<cglib.version>3.2.12</cglib.version>
	<atomikos.version>5.0.0</atomikos.version>
	<aspectjweaver.version>1.9.4</aspectjweaver.version>
	<aspectjrt.version>1.5.4</aspectjrt.version>
	<jta.version>1.1</jta.version>
	<mybatise.version>3.2.0</mybatise.version>
	<mybatis.spring>1.2.0</mybatis.spring>
	<log4j.version>1.2.17</log4j.version>
	<junit.version>4.12</junit.version>
	<cglib.version>3.2.4</cglib.version>
</properties>
<dependencies>
	<dependency>
		<groupId>org.mybatis</groupId>
		<artifactId>mybatis</artifactId>
		<version>${mybatise.version}</version>
	</dependency>
	<dependency>
		<groupId>org.mybatis</groupId>
		<artifactId>mybatis-spring</artifactId>
		<version>${mybatis.spring}</version>
	</dependency>
	<dependency>
		<groupId>com.atomikos</groupId>
		<artifactId>atomikos-util</artifactId>
		<version>${atomikos.version}</version>
	</dependency>
	<dependency>
		<groupId>com.atomikos</groupId>
		<artifactId>transactions</artifactId>
		<version>${atomikos.version}</version>
	</dependency>
	<dependency>
		<groupId>com.atomikos</groupId>
		<artifactId>transactions-jta</artifactId>
		<version>${atomikos.version}</version>
	</dependency>
	<dependency>
		<groupId>com.atomikos</groupId>
		<artifactId>transactions-jdbc</artifactId>
		<version>${atomikos.version}</version>
	</dependency>
	<dependency>
		<groupId>com.atomikos</groupId>
		<artifactId>transactions-api</artifactId>
		<version>${atomikos.version}</version>
	</dependency>
	<dependency>
		<groupId>javax.transaction</groupId>
		<artifactId>jta</artifactId>
		<version>${jta.version}</version>
	</dependency>
	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib-nodep</artifactId>
		<version>${cglib.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-test</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-web</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-tx</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-beans</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-jdbc</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-webmvc</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-orm</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context-support</artifactId>
		<version>${spring.version}</version>
	</dependency>
	<!-- Spring Aop依赖jar -->
	<dependency>
		<groupId>org.aspectj</groupId>
		<artifactId>aspectjweaver</artifactId>
		<version>${aspectjweaver.version}</version>
	</dependency>

	<dependency>
		<groupId>aspectj</groupId>
		<artifactId>aspectjrt</artifactId>
		<version>${aspectjrt.version}</version>
	</dependency>
	<!-- CGLIB -->
	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib</artifactId>
		<version>${cglib.version}</version>
	</dependency>
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>${mysql.version}</version>
	</dependency>
	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid</artifactId>
		<version>${druid.version}</version>
	</dependency>
	<dependency>
		<groupId>junit</groupId>
		<artifactId>junit</artifactId>
		<version>${junit.version}</version>
		<scopte>test</scope>
	</dependency>
</dependencies>

spring-application-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.1.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd">
    
     <!-- 1. 数据源配置 -->
    <context:property-placeholder location="classpath*:*.properties" file-encoding="utf8" />
	<bean id="utf8" class="java.lang.String">
		<constructor-arg value="utf-8"></constructor-arg>
	</bean>
    <!-- 开启异步任务（同时开启定时器注解扫描） -->
    <task:annotation-driven />
    <!-- 使用@AspectJ风格的切面声明 -->
    <!-- <aop:aspectj-autoproxy/> -->
    <!-- 使用Annotation自动注册Bean -->
    <!-- 在主容器中不扫描@Controller注解，在SpringMvc中只扫描@Controller注解 -->
    <context:component-scan base-package="net.xiake6"><!-- base-package 如果多个，用“,”分隔 --> 
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>  
    <!-- 引入Mybatis配置 -->
    <!-- <import resource="spring-mybatis-atomikos-druid.xml"/> -->
    <import resource="spring-mybatis-atomikos-druid.xml"/>
</beans>

spring-mybatis-atomikos-druid.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
    http://www.springframework.org/schema/jee 
    http://www.springframework.org/schema/jee/spring-jee-3.0.xsd 
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd"
    default-lazy-init="true">   

	<context:annotation-config />
	<!-- 使用Druid使为XA数据源 -->
    <bean id="abstractXADataSource" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close" abstract="true">
        <property name="xaDataSourceClassName" value="com.alibaba.druid.pool.xa.DruidXADataSource"/>
        <property name="xaProperties">
            <props>
            	<prop key="driverClassName">${jdbc.driverClassName}</prop>
            	<!-- 配置初始化大小、最小、最大 -->
				<prop key="initialSize">10</prop>
				<prop key="minIdle">3</prop>
				<prop key="maxActive">100</prop>
				<!-- 配置获取连接等待超时的时间 -->
				<prop key="maxWait">60000</prop>
				<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
				<prop key="timeBetweenEvictionRunsMillis">60000</prop>
				<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
				<prop key="minEvictableIdleTimeMillis">300000</prop>
				<prop key="validationQuery">SELECT 'x'</prop>
				<prop key="testWhileIdle">true</prop>
				<prop key="testOnBorrow">false</prop>
				<prop key="testOnReturn">false</prop>
				<!-- 配置监控统计拦截的filters -->
				<prop key="filters">stat</prop>
            </props>
        </property>
    </bean>
    <!-- 配置数据源一 -->
    <bean id="dataSourceOne" parent="abstractXADataSource">
        <property name="uniqueResourceName">
            <value>dataSourceOne</value>
        </property>
        <property name="xaProperties">
            <props>
                <prop key="url">${jdbc.url}</prop>
                <prop key="username">${jdbc.username}</prop>
                <prop key="password">${jdbc.password}</prop>
            </props>
        </property>
    </bean>
    <!--配置数据源二-->
    <bean id="dataSourceTwo" parent="abstractXADataSource">
        <property name="uniqueResourceName">
            <value>dataSourceTwo</value>
        </property>
        <property name="xaProperties">
            <props>
                <prop key="url">${jdbc.two.url}</prop>
                <prop key="username">${jdbc.two.username}</prop>
                <prop key="password">${jdbc.two.password}</prop>
            </props>
        </property>
    </bean>
    
    <!--mybatis的相关配置-->
    <bean id="sqlSessionFactoryOne" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSourceOne"/>
        <property name="mapperLocations" value="classpath*:mapping/ds1/*.xml"/>
    </bean>
    
    <bean id="sqlSessionFactoryTwo" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSourceTwo"/>
        <property name="mapperLocations" value="classpath*:mapping/ds2/*.xml"/>
    </bean>
    
    <!--配置mybatis映射文件自动扫描-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="net.xiake6.dao.ds1"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryOne"/>
    </bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="net.xiake6.dao.ds2"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryTwo"/>
    </bean>

    <!--配置分布式事务-->
    <bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" init-method="init" destroy-method="close">
        <property name="forceShutdown" value="false"/>
    </bean>
    <bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp">
        <property name="transactionTimeout" value="3000"/>
    </bean>
    <!--JTA事务管理器-->
    <bean id="jtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManager">
            <ref bean="atomikosTransactionManager"/>
        </property>
        <property name="userTransaction">
            <ref bean="atomikosUserTransaction"/>
        </property>
        <property name="allowCustomIsolationLevels" value="true"/>
    </bean>
   
    
    <aop:config proxy-target-class="true">  
        <aop:advisor pointcut="execution(* *net.xiake6.service..*(..))" advice-ref="txAdvice" />  
    </aop:config>  
    <tx:advice id="txAdvice" transaction-manager="jtaTransactionManager">  
        <tx:attributes>  
            <tx:method name="insert*"  propagation="REQUIRED" read-only="false" rollback-for="*Exception"/>
            <tx:method name="add*" propagation="REQUIRED" read-only="false" rollback-for="*Exception" />  
            <tx:method name="save*"  propagation="REQUIRED"  read-only="false" rollback-for="*Exception" />    
            <tx:method name="delete*"  propagation="REQUIRED"  read-only="false" rollback-for="*Exception" />  
            <tx:method name="del*"  propagation="REQUIRED"  read-only="false" rollback-for="*Exception" />  
            <tx:method name="update*"  propagation="REQUIRED"  read-only="false" rollback-for="*Exception" />
            <tx:method name="select*"  propagation="REQUIRED"  read-only="true" />
            <tx:method name="query"  propagation="REQUIRED"  read-only="true" />
        </tx:attributes>  
    </tx:advice>
    
    <!-- 配置事务管理 -->
    <tx:annotation-driven transaction-manager="jtaTransactionManager" />
</beans>

jdbc.properties

#mysql 6.*以上
jdbc.driverClassName = com.mysql.cj.jdbc.Driver
jdbc.url = jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8&pinGlobalTxToPhysicalConnection=true&useSSL=false
jdbc.username =root
jdbc.password =root

jdbc.two.url = jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8&pinGlobalTxToPhysicalConnection=true&useSSL=false
jdbc.two.username =root
jdbc.two.password =root

jta.properties

com.atomikos.icatch.service=com.atomikos.icatch.standalone.UserTransactionServiceFactory
com.atomikos.icatch.console_file_name=tm.release.out
com.atomikos.icatch.log_base_name=tm.releaselog
com.atomikos.icatch.tm_unique_name=com.atomikos.spring.jdbc.tm.release
com.atomikos.icatch.console_log_level=INFO

TestInsert.java

@ContextConfiguration(value = {"classpath:spring-application-context.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class TestInsert {
	private Logger logger = LoggerFactory.getLogger(TestInsert.class);
	@Autowired
	private BatchInsertService batchInsertService;

	@Test
	public void insert(){
		
		long startTime = System.currentTimeMillis();
		User user = new User();
		user.setName("User_"+(int)(Math.random()*100));
		user.setAge((int)(Math.random()*100));
		
		CustInfo info = new CustInfo();
		info.setPhone("123456789"+(int)(Math.random()*100));
		batchInsertService.insert(user,info);
		
		long endTime = System.currentTimeMillis();
		logger.info("共耗时：{}毫秒",endTime -startTime);
	}
}

BatchInsertService.java

@Service
public class BatchInsertService {
	private Logger logger = LoggerFactory.getLogger(BatchInsertService.class);
	@Autowired
	private UserService userService;
	@Autowired
	private CustInfoService custInfoService;
	@Transactional(rollbackFor= {Exception.class,RuntimeException.class})
	public void insert(User user,CustInfo custInfo) {
		int insertUser =  userService.insert(user);
		logger.info("insertUser={}",insertUser);
		int insertCustInfo = custInfoService.insert(custInfo);
		logger.info("insertCustInfo={}",insertCustInfo);
	}
}

UserService.java

@Service
public class UserService {
	@Autowired
	private UserMapper userMapper;
	
	public int insert(User record) {
		int result = userMapper.insert(record);
		return result;
	}
	
}

CustInfoService.java

@Service
public class CustInfoService {
	@Autowired
	private CustInfoMapper custInfoMapper;

	public int insert(CustInfo record) {
		int result = custInfoMapper.insert(record);
		long now = System.currentTimeMillis();
		// 模拟一个异常
		if (now % 2 == 0) {
			throw new RuntimeException("CustInfoMapper throws test insert exception");
		}
		return result;
	}
}

Mapper和Bean等就不列出来了，完成的示例工程在github： https://github.com/fenglibin/DruidWithAtomikos

原文 https://blog.csdn.net/fenglibing/article/details/92799414

正文到此结束