分布式事务JTA之实践:Spring+ATOMIKOS参考

分布式事务JTA之实践:Spring+ATOMIKOS

作者: Michael 日期: 2012 年 2 月 28 日 发表评论 (4) 查看评论

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michael_jta_code.zip

1.代码的目录结构图如下：

转账测试的的代码片段：

1 /**
2      * 转账测试
3      * @param srcId
4      * @param destId
5      * @param money
6      * @return boolean
7      */
8     public boolean doTestTransfer(String srcId, String destId, float money) {
9
10         BankAccount srcAccount = bankAccountDao.getByUserName(srcId);
11         BankAccount destAccount = bankAccountDao.getByUserName(destId);
12         if (srcAccount.getDeposit() < money) {
13             System.out.println("warn :" + srcAccount.getUserName()
14                     + " has not enough money to transfer");
15             return false;
16         }
17         srcAccount.setDeposit(srcAccount.getDeposit() - money);
18         destAccount.setDeposit(destAccount.getDeposit() + money);
19         // 把更新存款信息置于异常发生之前
20         bankAccountDao.update(srcAccount);
21         bankAccountDao.update(destAccount);
22
23         Date curTime = new Date();
24         UserInfo srcUser = userInfoDao.getById(srcId);
25         UserInfo destUser = userInfoDao.getById(destId);
26
27         destUser.setRemark1(curTime + "");
28         destUser.setRemark2(curTime + "");
29         // 把更新基本信息置于异常发生之前
30         userInfoDao.update(destUser);
31         srcUser.setRemark1(curTime + "");
32         if (srcAccount.getDeposit() < 18000) {
33             throw new RuntimeException("michael test exception for JTA  ");
34         }
35         srcUser.setRemark2(curTime + "");
36
37         userInfoDao.update(srcUser);
38         System.out.println("success done:" + srcAccount.getUserName()
39                 + " transfer ￥" + money + " to " + destAccount.getUserName());
40
41         return true;
42     }

2. 配置文件详细介绍：

jta.jdbc.properties

1 #see http://www.micmiu.com
2 # eg. for mysql
3 jdbc.SDS.class=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
4 jdbc.SDS.properties=URL=jdbc:mysql://192.168.8.253:3306/demota;user=root;password=111111
5
6 jdbc.SDS2.class=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
7 jdbc.SDS2.properties=URL=jdbc:mysql://192.168.8.150:3306/demota;user=root;password=111111

jta.properties

1 #see http://www.micmiu.com
2 com.atomikos.icatch.service=com.atomikos.icatch.standalone.UserTransactionServiceFactory
3 com.atomikos.icatch.console_file_name = tm.out
4 com.atomikos.icatch.log_base_name = tmlog
5 com.atomikos.icatch.tm_unique_name = com.atomikos.spring.jdbc.tm
6 com.atomikos.icatch.console_log_level = INFO

jta1.hibernate.cfg.xml

1 <!DOCTYPE hibernate-configuration
2     PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
3     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
4
5 <hibernate-configuration>
6     <session-factory>
7         <property name="dialect">
8             org.hibernate.dialect.MySQL5Dialect
9         </property>
10         <property name="hbm2ddl.auto">update</property>
11         <mapping class="michael.jta.atomikos.domain.UserInfo" />
12     </session-factory>
13
14 </hibernate-configuration>

jta2.hibernate.cfg.xml

1 <!DOCTYPE hibernate-configuration
2     PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
3     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
4
5 <hibernate-configuration>
6
7     <session-factory>
8         <property name="show_sql">true</property>
9         <property name="dialect">
10             org.hibernate.dialect.MySQL5Dialect
11         </property>
12         <property name="hbm2ddl.auto">update</property>
13         <mapping class="michael.jta.atomikos.domain.BankAccount" />
14     </session-factory>
15
16 </hibernate-configuration>

jta.spring.xml

 

1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
3 <beans>
4     <!-- Configurer that replaces ${...} placeholders with values from properties files -->
5     <bean id="propertyConfigurer"
6         class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
7         <property name="locations">
8             <list>
9                 <value>classpath:jta.jdbc.properties</value>
10             </list>
11         </property>
12     </bean>
13
14     <!-- 数据源配置 http://sjsky.iteye.com-->
15     <bean id="SDS" class="com.atomikos.jdbc.SimpleDataSourceBean"
16         init-method="init" destroy-method="close">
17         <property name="uniqueResourceName">
18             <value>SDS</value>
19         </property>
20         <property name="xaDataSourceClassName">
21             <value>${jdbc.SDS.class}</value>
22         </property>
23         <property name="xaDataSourceProperties">
24             <value>${jdbc.SDS.properties}</value>
25         </property>
26         <property name="exclusiveConnectionMode">
27             <value>true</value>
28         </property>
29         <property name="connectionPoolSize">
30             <value>3</value>
31         </property>
32         <property name="validatingQuery">
33             <value>SELECT 1</value>
34         </property>
35     </bean>
36
37     <bean id="SDS2" class="com.atomikos.jdbc.SimpleDataSourceBean"
38         init-method="init" destroy-method="close">
39         <property name="uniqueResourceName">
40             <value>SDS2</value>
41         </property>
42         <property name="xaDataSourceClassName">
43             <value>${jdbc.SDS2.class}</value>
44         </property>
45         <property name="xaDataSourceProperties">
46             <value>${jdbc.SDS2.properties}</value>
47         </property>
48         <property name="exclusiveConnectionMode">
49             <value>true</value>
50         </property>
51         <property name="connectionPoolSize">
52             <value>3</value>
53         </property>
54         <property name="validatingQuery">
55             <value>SELECT 1</value>
56         </property>
57     </bean>
58
59     <!-- sessionFactory http://www.micmiu.com-->
60     <bean id="sessionFactory1"
61         class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
62         <property name="dataSource" ref="SDS" />
63         <property name="configLocation"
64             value="classpath:jta1.hibernate.cfg.xml" />
65     </bean>
66
67     <bean id="sessionFactory2"
68         class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
69         <property name="dataSource" ref="SDS2" />
70         <property name="configLocation"
71             value="classpath:jta2.hibernate.cfg.xml" />
72     </bean>
73
74     <!-- TransactionManager http://www.micmiu.com-->
75     <!-- Construct Atomikos UserTransactionManager, needed to configure Spring -->
76     <bean id="atomikosTransactionManager"
77         class="com.atomikos.icatch.jta.UserTransactionManager"
78         init-method="init" destroy-method="close">
79         <!--  when close is called, should we force transactions to terminate or not? -->
80         <property name="forceShutdown">
81             <value>true</value>
82         </property>
83     </bean>
84
85     <!-- Also use Atomikos UserTransactionImp, needed to configure Spring  -->
86     <bean id="atomikosUserTransaction"
87         class="com.atomikos.icatch.jta.UserTransactionImp">
88         <property name="transactionTimeout">
89             <value>300</value>
90         </property>
91     </bean>
92
93     <!-- Configure the Spring framework to use JTA transactions from Atomikos -->
94     <bean id="springJTATransactionManager"
95         class="org.springframework.transaction.jta.JtaTransactionManager">
96
97         <property name="transactionManager">
98             <ref bean="atomikosTransactionManager" />
99         </property>
100         <property name="userTransaction">
101             <ref bean="atomikosUserTransaction" />
102         </property>
103     </bean>
104
105     <!-- Configure DAO http://www.micmiu.com-->
106     <bean id="userInfoDao"
107         class="michael.jta.atomikos.dao.impl.UserInfoDaoImpl">
108         <property name="sessionFactory" ref="sessionFactory1" />
109     </bean>
110     <bean id="bankAccountDao"
111         class="michael.jta.atomikos.dao.BankAccountDao">
112         <property name="sessionFactory" ref="sessionFactory2" />
113     </bean>
114
115     <bean id="bankAccountService"
116         class="michael.jta.atomikos.service.impl.BankAccountServiceImpl">
117         <property name="userInfoDao" ref="userInfoDao" />
118         <property name="bankAccountDao" ref="bankAccountDao" />
119     </bean>
120
121     <!-- 定义事务规则的拦截器 http://www.micmiu.com-->
122     <bean id="transactionInterceptor"
123         class="org.springframework.transaction.interceptor.TransactionInterceptor">
124         <property name="transactionManager"
125             ref="springJTATransactionManager" />
126         <property name="transactionAttributes">
127             <props>
128                 <prop key="*">PROPAGATION_REQUIRED</prop>
129             </props>
130         </property>
131     </bean>
132
133     <!-- 声明式事务边界配置 所有的bean公用一个代理bean http://sjsky.iteye.com-->
134     <bean id="baseTransactionProxy"
135         class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
136         abstract="true">
137         <property name="transactionManager"
138             ref="springJTATransactionManager" />
139         <property name="transactionAttributes">
140             <props>
141                 <!-- 可以根据实际情况细化配置提高性能 -->
142                 <prop key="*">PROPAGATION_REQUIRED</prop>
143             </props>
144         </property>
145     </bean>
146
147     <bean id="bankAccountServiceProxy" parent="baseTransactionProxy">
148         <property name="target">
149             <ref bean="bankAccountService" />
150         </property>
151     </bean>
152
153 </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）：

1 DROP DATABASE IF EXISTS demota;
2 CREATE DATABASE demota;
3 USE demota;
4 DROP TABLE  IF EXISTS tb_user_info;
5
6 CREATE TABLE tb_user_info (
7     user_name varchar(20),
8     real_name varchar(10),
9     remark1 varchar(50),
10     remark2 varchar(50)
11     ) ENGINE = InnoDB;
12
13 INSERT INTO tb_user_info (user_name,real_name,remark1,remark2) VALUES ('husband','husband','','');
14 INSERT INTO tb_user_info (user_name,real_name,remark1,remark2) VALUES ('wife','wife','','');

数据库B（192.168.8.150）：

1 DROP DATABASE IF EXISTS demota;
2 CREATE DATABASE demota;
3 USE demota;
4 DROP TABLE  IF EXISTS tb_account;
5 CREATE TABLE tb_account (
6  id int AUTO_INCREMENT,
7  user_name varchar(20),
8  deposit float(10,2),
9  PRIMARY KEY(id)
10  ) ENGINE = InnoDB;
11
12 INSERT INTO tb_account (user_name,deposit) VALUES ('husband',20000.00);
13 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

1 package michael.jta.atomikos;
2
3 import michael.jta.atomikos.service.BankAccountService;
4
5 import org.springframework.context.ApplicationContext;
6 import org.springframework.context.support.ClassPathXmlApplicationContext;
7
8 /**
9  * @author michael
10  *
11  */
12 public class JtaRunMainTest {
13
14     /**
15      * @param args
16      */
17     public static void main(String[] args) {
18         System.out.println("------------start");
19         ApplicationContext appCt = new ClassPathXmlApplicationContext(
20                 "jta.spring.xml");
21         System.out.println("------------finished init xml");
22
23         Object bean = appCt.getBean("bankAccountServiceProxy");
24         System.out.println(bean.getClass());
25         BankAccountService service = (BankAccountService) bean;
26         service.doTestTransfer("husband", "wife", 2000);
27     }
28 }

运行第一次结果：

1 ------------start
2 ------------finished init xml
3  class $Proxy11
4  Hibernate: select bankaccoun0_.id as id2_, bankaccoun0_.deposit as deposit2_, bankaccoun0_.user_name as user3_2_ from tb_account bankaccoun0_ where bankaccoun0_.user_name=?
5  Hibernate: select bankaccoun0_.id as id2_, bankaccoun0_.deposit as deposit2_, bankaccoun0_.user_name as user3_2_ from tb_account bankaccoun0_ where bankaccoun0_.user_name=?
6 success done:husband transfer ￥2000.0 to wife
7  Hibernate: update tb_account set deposit=?, user_name=? where id=?
8  Hibernate: update tb_account set deposit=?, user_name=? where id=?

运行第二次结果：

1 ------------start
2 ------------finished init xml
3  class $Proxy11
4  Hibernate: select bankaccoun0_.id as id2_, bankaccoun0_.deposit as deposit2_, bankaccoun0_.user_name as user3_2_ from tb_account bankaccoun0_ where bankaccoun0_.user_name=?
5  Hibernate: select bankaccoun0_.id as id2_, bankaccoun0_.deposit as deposit2_, bankaccoun0_.user_name as user3_2_ from tb_account bankaccoun0_ where bankaccoun0_.user_name=?
6 Exception in thread "main" java.lang.RuntimeException: michael test exception for JTA
7 at michael.jta.atomikos.service.impl.BankAccountServiceImpl.doTestTransfer(BankAccountServiceImpl.java:51)
8  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
9  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
10  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
11  at java.lang.reflect.Method.invoke(Method.java:597)
12  at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:299)
13  at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:172)
14  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:139)
15  at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
16  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:161)
17  at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
18  at $Proxy11.doTestTransfer(Unknown Source)
19  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。

原创文章，转载请注明： 转载自micmiu – 大大的技术 | 小小的生活[ http://www.micmiu.com/ ]

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