分布式事务JTA之实践:Spring+ATOMIKOS

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Spring 企业应用 OpenSource JTA 分布式事务

blog迁移至 :http://www.micmiu.com

在2011.7.1号这个特殊的日子，发一blog，名为:分布式事务JTA之实践:Spring+ATOMIKOS 来庆祝党的90岁生日和iteye博客产品成功改版上线。

本文的目录结构如下：

一、概述
二、应用场景
三、实验模拟需求
四、实例测试环境
五、源代码下载及配置介绍
六、测试验证

一、概述：

本文主要讲述如何基于Atomikos 和 spring 在项目中实现分布式事务管理

二、应用场景：

如果项目中的数据源来自多个数据库，同时又需要在多数据源中保证事务，此时就需要用到分布式事务处理了。

三、实验模拟需求：

比如有两个对象：用户信息、用户存款，用户信息存在数据库A、存款信息存在数据库B，若客户甲向乙转账，需要在数据库B中对甲、乙的存款信息修改，同时在数据库A中把甲、乙的备注信息最新为最近一次的操作时间。

四 、实例测试环境：

spring、hibernate3.2
mysql5.1.51（需要版本5.0+）
AtomikosTransactionsEssentials-3.7.0 （详细可参加它的官网：http://www.atomikos.com ）

说明：

1. 测试的数据库需要支持分布式事务，同时JDBC要支持XA 连接驱动。本次测试用的mysql5.1是支持事务的，JDBC驱动版本：mysql-connector-java-5.1.7-bin.jar，包含对 XA连接的支持：com.mysql.jdbc.jdbc2.optional.MysqlXAConnection。

2. 附件提供AtomikosTransactionsEssentials 3.7.0 lib包下载：AtomikosTransactionsEssentials-3.7.0-lib.zip

官方下载地址：http://www.atomikos.com/Main/TransactionsEssentialsDownloadForm ，需要先注册才能下载。同时这里也提供目前3.7.0的下载链接：http://www.atomikos.com/downloads/transactions-essentials/com/atomikos/AtomikosTransactionsEssentials/3.7.0/AtomikosTransactionsEssentials-3.7.0-bin.zip

五、代码及配置介绍：

源代码下载：分布式事务实例演示源代码

1.代码的目录结构图如下：

转账测试的的代码片段：

 /**
     * 转账测试
     * @param srcId
     * @param destId
     * @param money
     * @return boolean
     */
    public boolean doTestTransfer(String srcId, String destId, float money) {

        BankAccount srcAccount = bankAccountDao.getByUserName(srcId);
        BankAccount destAccount = bankAccountDao.getByUserName(destId);
        if (srcAccount.getDeposit() < money) {
            System.out.println("warn :" + srcAccount.getUserName()
                    + " has not enough money to transfer");
            return false;
        }
        srcAccount.setDeposit(srcAccount.getDeposit() - money);
        destAccount.setDeposit(destAccount.getDeposit() + money);
        // 把更新存款信息置于异常发生之前
        bankAccountDao.update(srcAccount);
        bankAccountDao.update(destAccount);

        Date curTime = new Date();
        UserInfo srcUser = userInfoDao.getById(srcId);
        UserInfo destUser = userInfoDao.getById(destId);

        destUser.setRemark1(curTime + "");
        destUser.setRemark2(curTime + "");
        // 把更新基本信息置于异常发生之前
        userInfoDao.update(destUser);
        srcUser.setRemark1(curTime + "");
        if (srcAccount.getDeposit() < 18000) {
            throw new RuntimeException("michael test exception for JTA  ");
        }
        srcUser.setRemark2(curTime + "");
        
        userInfoDao.update(srcUser);
        System.out.println("success done:" + srcAccount.getUserName()
                + " transfer ￥" + money + " to " + destAccount.getUserName());

        return true;
    }

2. 配置文件详细介绍：

jta.jdbc.properties

#see http://sjsky.iteye.com
# eg. for mysql
jdbc.SDS.class=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
jdbc.SDS.properties=URL=jdbc:mysql://192.168.8.253:3306/demota;user=root;password=111111

jdbc.SDS2.class=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
jdbc.SDS2.properties=URL=jdbc:mysql://192.168.8.150:3306/demota;user=root;password=111111

jta.properties

#see http://sjsky.iteye.com
com.atomikos.icatch.service=com.atomikos.icatch.standalone.UserTransactionServiceFactory
com.atomikos.icatch.console_file_name = tm.out
com.atomikos.icatch.log_base_name = tmlog
com.atomikos.icatch.tm_unique_name = com.atomikos.spring.jdbc.tm
com.atomikos.icatch.console_log_level = INFO

jta1.hibernate.cfg.xml

<!DOCTYPE hibernate-configuration
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>
		<property name="dialect">
			org.hibernate.dialect.MySQL5Dialect
		</property>
		<property name="hbm2ddl.auto">update</property>
		<mapping class="michael.jta.atomikos.domain.UserInfo" />
	</session-factory>

</hibernate-configuration>

jta2.hibernate.cfg.xml

<!DOCTYPE hibernate-configuration
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

	<session-factory>
		<property name="show_sql">true</property>
		<property name="dialect">
			org.hibernate.dialect.MySQL5Dialect
		</property>
		<property name="hbm2ddl.auto">update</property>
		<mapping class="michael.jta.atomikos.domain.BankAccount" />
	</session-factory>

</hibernate-configuration>

jta.spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
	<!-- Configurer that replaces ${...} placeholders with values from properties files -->
	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:jta.jdbc.properties</value>
			</list>
		</property>
	</bean>

	<!-- 数据源配置 http://sjsky.iteye.com-->
	<bean id="SDS" class="com.atomikos.jdbc.SimpleDataSourceBean"
		init-method="init" destroy-method="close">
		<property name="uniqueResourceName">
			<value>SDS</value>
		</property>
		<property name="xaDataSourceClassName">
			<value>${jdbc.SDS.class}</value>
		</property>
		<property name="xaDataSourceProperties">
			<value>${jdbc.SDS.properties}</value>
		</property>
		<property name="exclusiveConnectionMode">
			<value>true</value>
		</property>
		<property name="connectionPoolSize">
			<value>3</value>
		</property>
		<property name="validatingQuery">
			<value>SELECT 1</value>
		</property>
	</bean>

	<bean id="SDS2" class="com.atomikos.jdbc.SimpleDataSourceBean"
		init-method="init" destroy-method="close">
		<property name="uniqueResourceName">
			<value>SDS2</value>
		</property>
		<property name="xaDataSourceClassName">
			<value>${jdbc.SDS2.class}</value>
		</property>
		<property name="xaDataSourceProperties">
			<value>${jdbc.SDS2.properties}</value>
		</property>
		<property name="exclusiveConnectionMode">
			<value>true</value>
		</property>
		<property name="connectionPoolSize">
			<value>3</value>
		</property>
		<property name="validatingQuery">
			<value>SELECT 1</value>
		</property>
	</bean>

	<!-- sessionFactory http://sjsky.iteye.com-->
	<bean id="sessionFactory1"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="SDS" />
		<property name="configLocation"
			value="classpath:jta1.hibernate.cfg.xml" />
	</bean>

	<bean id="sessionFactory2"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="SDS2" />
		<property name="configLocation"
			value="classpath:jta2.hibernate.cfg.xml" />
	</bean>

	<!-- TransactionManager http://sjsky.iteye.com-->
	<!-- Construct Atomikos UserTransactionManager, needed to configure Spring -->
	<bean id="atomikosTransactionManager"
		class="com.atomikos.icatch.jta.UserTransactionManager"
		init-method="init" destroy-method="close">
		<!--  when close is called, should we force transactions to terminate or not? -->
		<property name="forceShutdown">
			<value>true</value>
		</property>
	</bean>

	<!-- Also use Atomikos UserTransactionImp, needed to configure Spring  -->
	<bean id="atomikosUserTransaction"
		class="com.atomikos.icatch.jta.UserTransactionImp">
		<property name="transactionTimeout">
			<value>300</value>
		</property>
	</bean>

	<!-- Configure the Spring framework to use JTA transactions from Atomikos -->
	<bean id="springJTATransactionManager"
		class="org.springframework.transaction.jta.JtaTransactionManager">

		<property name="transactionManager">
			<ref bean="atomikosTransactionManager" />
		</property>
		<property name="userTransaction">
			<ref bean="atomikosUserTransaction" />
		</property>
	</bean>

	<!-- Configure DAO http://sjsky.iteye.com-->
	<bean id="userInfoDao"
		class="michael.jta.atomikos.dao.impl.UserInfoDaoImpl">
		<property name="sessionFactory" ref="sessionFactory1" />
	</bean>
	<bean id="bankAccountDao"
		class="michael.jta.atomikos.dao.BankAccountDao">
		<property name="sessionFactory" ref="sessionFactory2" />
	</bean>

	<bean id="bankAccountService"
		class="michael.jta.atomikos.service.impl.BankAccountServiceImpl">
		<property name="userInfoDao" ref="userInfoDao" />
		<property name="bankAccountDao" ref="bankAccountDao" />
	</bean>

	<!-- 定义事务规则的拦截器 http://sjsky.iteye.com-->
	<bean id="transactionInterceptor"
		class="org.springframework.transaction.interceptor.TransactionInterceptor">
		<property name="transactionManager"
			ref="springJTATransactionManager" />
		<property name="transactionAttributes">
			<props>
				<prop key="*">PROPAGATION_REQUIRED</prop>
			</props>
		</property>
	</bean>

	<!-- 声明式事务边界配置 所有的bean公用一个代理bean http://sjsky.iteye.com-->
	<bean id="baseTransactionProxy"
		class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
		abstract="true">
		<property name="transactionManager"
			ref="springJTATransactionManager" />
		<property name="transactionAttributes">
			<props>
				<!-- 可以根据实际情况细化配置提高性能 -->
				<prop key="*">PROPAGATION_REQUIRED</prop>
			</props>
		</property>
	</bean>

	<bean id="bankAccountServiceProxy" parent="baseTransactionProxy">
		<property name="target">
			<ref bean="bankAccountService" />
		</property>
	</bean>

</beans>

六、测试验证

1. 初始化数据：

因为mysql数据库表的类型有事务和非事务之分，建表时一定要注意确保表的类型是事务控制的：InnoDB

数据库A（192.168.8.253）：

DROP DATABASE IF EXISTS demota;
CREATE DATABASE demota;
USE demota;
DROP TABLE  IF EXISTS tb_user_info;

CREATE TABLE tb_user_info (
	user_name varchar(20),
	real_name varchar(10),
	remark1 varchar(50),
	remark2 varchar(50)
	) ENGINE = InnoDB;

INSERT INTO tb_user_info (user_name,real_name,remark1,remark2) VALUES ('husband','husband','','');
INSERT INTO tb_user_info (user_name,real_name,remark1,remark2) VALUES ('wife','wife','','');

数据库B（192.168.8.150）：

DROP DATABASE IF EXISTS demota;
CREATE DATABASE demota;
USE demota;
DROP TABLE  IF EXISTS tb_account;
CREATE TABLE tb_account (
 id int AUTO_INCREMENT, 
 user_name varchar(20),
 deposit float(10,2),
 PRIMARY KEY(id)
 ) ENGINE = InnoDB;

INSERT INTO tb_account (user_name,deposit) VALUES ('husband',20000.00);
INSERT INTO tb_account (user_name,deposit) VALUES ('wife',10000.00);

2. 测试过程：

ps: 代码中模拟了异常出现的条件：如果账户金额<18000会抛出异常

JtaRunMainTest.java

package michael.jta.atomikos;

import michael.jta.atomikos.service.BankAccountService;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author michael
 * 
 */
public class JtaRunMainTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("------------start");
        ApplicationContext appCt = new ClassPathXmlApplicationContext(
                "jta.spring.xml");
        System.out.println("------------finished init xml");

        Object bean = appCt.getBean("bankAccountServiceProxy");
        System.out.println(bean.getClass());
        BankAccountService service = (BankAccountService) bean;
        service.doTestTransfer("husband", "wife", 2000);
    }
}

运行第一次结果：

写道

运行第二次结果：

写道

------------start
------------finished init xml
class $Proxy11
Hibernate: select bankaccoun0_.id as id2_, bankaccoun0_.deposit as deposit2_, bankaccoun0_.user_name as user3_2_ from tb_account bankaccoun0_ where bankaccoun0_.user_name=?
Hibernate: select bankaccoun0_.id as id2_, bankaccoun0_.deposit as deposit2_, bankaccoun0_.user_name as user3_2_ from tb_account bankaccoun0_ where bankaccoun0_.user_name=?
Exception in thread "main" java.lang.RuntimeException: michael test exception for JTA
at michael.jta.atomikos.service.impl.BankAccountServiceImpl.doTestTransfer(BankAccountServiceImpl.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:299)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:139)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:161)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy11.doTestTransfer(Unknown Source)
at michael.jta.atomikos.JtaRunMainTest.main(JtaRunMainTest.java:26)

测试过程中数据库查询的结果截图：

从上面的数据库截图可见，第一正常运行时两个数据库同步更新了，第二次运行发生异常后，两个数据库的数据为发生变化，实现了事务回滚。

转载请注明来自：Michael's blog @ http://sjsky.iteye.com

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