Spring中集成JOTM 配置JTA事務:
假如業務中要用到多個數據庫,我們希望在業務方法中,當對某一個數據庫的數據表進行操作的事務失敗並回退(rollback),另外某一個數據庫的數據表的操作事務也要回退,但應用一般的事務管理達不到這樣的事務管理效果,這就需要實現 JTA 事務管理了。
這裡我們在SPring中集成 Object web 的一個開源JTA實現JOTM (可以在http://jotm.objectweb.org下載完整版) 來實現JTA事務管理。
1、將必須的類包放入類路徑中:
jotm.jar, xapool.jar, jotm_jrmp_stubs.jar, jta-spect1_0_1.jar, connector-1_5.jar等等。
2、編寫JOTM配置文件carol.properties,將其放到類路徑下:
Java代碼
#JNDI調用協議
carol.protocols=jrmp
#不使用CAROL JNDI封裝器
carol.start.jndi=false
#不啟動命名服務器
carol.start.ns=false
#JNDI調用協議
carol.protocols=jrmp
#不使用CAROL JNDI封裝器
carol.start.jndi=false
#不啟動命名服務器
carol.start.ns=false
3、在MYSQL中創建兩個數據庫 "jtatesta","jtatestb":
Java代碼
CREATE DATABASE IF NOT EXISTS jtatesta;
USE jtatesta;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`user_id` int(10) unsigned NOT NULL auto_increment,
`user_name` varchar(45) NOT NULL,
`user_password` varchar(45) NOT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;
INSERT INTO `user` (`user_id`,`user_name`,`user_password`) VALUES
(1,'tufu','tufu');
CREATE DATABASE IF NOT EXISTS jtatestb;
USE jtatestb;
DROP TABLE IF EXISTS `grade`;
CREATE TABLE `grade` (
`grade_id` int(10) unsigned NOT NULL auto_increment,
`user_id` int(10) unsigned NOT NULL,
`grade` double NOT NULL,
PRIMARY KEY (`grade_id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=latin1;
INSERT INTO `grade` (`grade_id`,`user_id`,`grade`) VALUES
(1,0,100);
CREATE DATABASE IF NOT EXISTS jtatesta;
USE jtatesta;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`user_id` int(10) unsigned NOT NULL auto_increment,
`user_name` varchar(45) NOT NULL,
`user_password` varchar(45) NOT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;
INSERT INTO `user` (`user_id`,`user_name`,`user_password`) VALUES
(1,'tufu','tufu');
CREATE DATABASE IF NOT EXISTS jtatestb;
USE jtatestb;
DROP TABLE IF EXISTS `grade`;
CREATE TABLE `grade` (
`grade_id` int(10) unsigned NOT NULL auto_increment,
`user_id` int(10) unsigned NOT NULL,
`grade` double NOT NULL,
PRIMARY KEY (`grade_id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=latin1;
INSERT INTO `grade` (`grade_id`,`user_id`,`grade`) VALUES
(1,0,100);
4、域對象、數據訪問類和其他事務管理的一樣,如:
Java代碼
//Domain對象User.java:
package com.domain;
import java.io.Serializable;
public class User implements Serializable {
private int user_id;
private String user_name;
private String user_password;
......//省略set、get方法
}
//Domain對象Grade.java:
package com.domain;
import java.io.Serializable;
public class Grade implements Serializable{
private int grade_id;
private User user;
private double grade;
.....//省略set、get方法
}
應用Spring JDBC的DAO:(省略DAO接口)
//UserJdbcDao.java:
package com.dao.jdbc;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import com.dao.UserDao;
import com.domain.User;
public class UserJdbcDao extends JdbcDaoSupport implements UserDao{
public void addUser(User user){
String SQL = "INSERT INTO user(user_id,user_name,user_password) VALUES(?,?,?)";
Object[] params = new Object[]{
user.getUser_id(),user.getUser_name(),user.getUser_password()
};
this.getJdbcTemplate().update(SQL, params);
}
}
//GradeJdbcDao.java:
package com.dao.jdbc;
import com.dao.GradeDao;
import com.domain.Grade;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
public class GradeJdbcDao extends JdbcDaoSupport implements GradeDao{
public void addGrade(Grade grade){
final String SQL = "INSERT INTO grade(user_id,grade) VALUES(?,?)";
Object[] params = new Object[]{
grade.getUser().getUser_id(),grade.getGrade()
};
this.getJdbcTemplate().update(SQL, params);
}
}
//Domain對象User.java:
package com.domain;
import java.io.Serializable;
public class User implements Serializable {
private int user_id;
private String user_name;
private String user_password;
......//省略set、get方法
}
//Domain對象Grade.java:
package com.domain;
import java.io.Serializable;
public class Grade implements Serializable{
private int grade_id;
private User user;
private double grade;
.....//省略set、get方法
}
應用Spring JDBC的DAO:(省略DAO接口)
//UserJdbcDao.java:
package com.dao.jdbc;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import com.dao.UserDao;
import com.domain.User;
public class UserJdbcDao extends JdbcDaoSupport implements UserDao{
public void addUser(User user){
String SQL = "INSERT INTO user(user_id,user_name,user_password) VALUES(?,?,?)";
Object[] params = new Object[]{
user.getUser_id(),user.getUser_name(),user.getUser_password()
};
this.getJdbcTemplate().update(SQL, params);
}
}
//GradeJdbcDao.java:
package com.dao.jdbc;
import com.dao.GradeDao;
import com.domain.Grade;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
public class GradeJdbcDao extends JdbcDaoSupport implements GradeDao{
public void addGrade(Grade grade){
final String SQL = "INSERT INTO grade(user_id,grade) VALUES(?,?)";
Object[] params = new Object[]{
grade.getUser().getUser_id(),grade.getGrade()
};
this.getJdbcTemplate().update(SQL, params);
}
}
5、應用了JTA事務管理的業務類(省略了接口),用@Transactional注解標注,以在配置文件中可以用<tx:annotation-driven>注解驅動自動進行事務增強:
Java代碼
package com.service.impl;
import com.dao.GradeDao;
import com.dao.UserDao;
import com.domain.*;
import org.springframework.transaction.annotation.Transactional;
import com.service.MyService;
@Transactional
public class MyServiceImpl implements MyService {
private UserDao userDao;
private GradeDao gradeDao;
public void setUserDao(UserDao userDao){
this.userDao = userDao;
}
public void setGradeDao(GradeDao gradeDao){
this.gradeDao = gradeDao;
}
@Transactional(readOnly=false)
public void addGrade(User user,Grade grade){
//假如希望兩個添加數據的事務,其中有一個添加失敗時,均回滾,
//由於兩個操作是在兩個不同的數據庫上進行的,故要JTA事務來進行管理
//否則,將會出現添加一個,回滾一個的情形
gradeDao.addGrade(grade);
userDao.addUser(user);
}
}
package com.service.impl;
import com.dao.GradeDao;
import com.dao.UserDao;
import com.domain.*;
import org.springframework.transaction.annotation.Transactional;
import com.service.MyService;
@Transactional
public class MyServiceImpl implements MyService {
private UserDao userDao;
private GradeDao gradeDao;
public void setUserDao(UserDao userDao){
this.userDao = userDao;
}
public void setGradeDao(GradeDao gradeDao){
this.gradeDao = gradeDao;
}
@Transactional(readOnly=false)
public void addGrade(User user,Grade grade){
//假如希望兩個添加數據的事務,其中有一個添加失敗時,均回滾,
//由於兩個操作是在兩個不同的數據庫上進行的,故要JTA事務來進行管理
//否則,將會出現添加一個,回滾一個的情形
gradeDao.addGrade(grade);
userDao.addUser(user);
}
}
6、spring為JOTM提供了一個org.springframework.transaction.jta.JotmFactoryBean 支持類,可以用其方便地創建本地JOTM實例。
具體的配置文件app_jta.xml如下:
Xml代碼
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsp="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsp:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<!--JOTM本地實例-->
<bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean"/>
<!--JTA事務管理器-->
<bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="userTransaction" ref="jotm"/><!--指定userTransaction屬性引用JOTM本地實例-->
</bean>
<!--XAPool配置,內部包含了一XA數據源,對應了數據庫jtatesta
支持JTA事務的數據源,必須封裝成XAPool-->
<bean id="jtaTestADS" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
destroy-method="shutdown">
<property name="dataSource"><!--內部XA數據源-->
<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
destroy-method="shutdown">
<property name="transactionManager" ref="jotm"/>
<property name="driverName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost/jtatesta"/>
</bean>
</property>
<property name="user" value="root"/>
<property name="password" value="885123"/>
</bean>
<!--類似地,對應了數據庫jtatestb的XAPool配置,內部包含了一XA數據源-->
<bean id="jtaTestBDS" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
destroy-method="shutdown">
<property name="dataSource"><!--內部XA數據源-->
<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
destroy-method="shutdown">
<property name="transactionManager" ref="jotm"/>
<property name="driverName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost/jtatestb"/>
</bean>
</property>
<property name="user" value="root"/>
<property name="password" value="885123"/>
</bean>
<!--分別配置訪問jtaTestADS、jtaTestBDS數據源的Spring JDBC模板-->
<bean id="jtaTestATemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="jtaTestADS"/>
</bean>
<bean id="jtaTestBTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="jtaTestBDS"/>
</bean>
<!--分別配置基於模板jtaTestADS,jtaTestBDS的DAO-->
<bean id="userDao" class="com.dao.jdbc.UserJdbcDao">
<property name="jdbcTemplate" ref="jtaTestATemplate"/>
</bean>
<bean id="gradeDao" class="com.dao.jdbc.GradeJdbcDao">
<property name="jdbcTemplate" ref="jtaTestBTemplate"/>
</bean>
<!--跨數據庫的JTA事務的業務類-->
<bean id="myService" class="com.service.impl.MyServiceImpl">
<property name="userDao" ref="userDao"/>
<property name="gradeDao" ref="gradeDao"/>
</bean>
<!--注解事務驅動-->
<tx:annotation-driven transaction-manager="txManager" proxy-target-class="true"/>
</beans>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsp="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsp:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<!--JOTM本地實例-->
<bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean"/>
<!--JTA事務管理器-->
<bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="userTransaction" ref="jotm"/><!--指定userTransaction屬性引用JOTM本地實例-->
</bean>
<!--XAPool配置,內部包含了一XA數據源,對應了數據庫jtatesta
支持JTA事務的數據源,必須封裝成XAPool-->
<bean id="jtaTestADS" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
destroy-method="shutdown">
<property name="dataSource"><!--內部XA數據源-->
<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
destroy-method="shutdown">
<property name="transactionManager" ref="jotm"/>
<property name="driverName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost/jtatesta"/>
</bean>
</property>
<property name="user" value="root"/>
<property name="password" value="885123"/>
</bean>
<!--類似地,對應了數據庫jtatestb的XAPool配置,內部包含了一XA數據源-->
<bean id="jtaTestBDS" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
destroy-method="shutdown">
<property name="dataSource"><!--內部XA數據源-->
<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
destroy-method="shutdown">
<property name="transactionManager" ref="jotm"/>
<property name="driverName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost/jtatestb"/>
</bean>
</property>
<property name="user" value="root"/>
<property name="password" value="885123"/>
</bean>
<!--分別配置訪問jtaTestADS、jtaTestBDS數據源的Spring JDBC模板-->
<bean id="jtaTestATemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="jtaTestADS"/>
</bean>
<bean id="jtaTestBTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="jtaTestBDS"/>
</bean>
<!--分別配置基於模板jtaTestADS,jtaTestBDS的DAO-->
<bean id="userDao" class="com.dao.jdbc.UserJdbcDao">
<property name="jdbcTemplate" ref="jtaTestATemplate"/>
</bean>
<bean id="gradeDao" class="com.dao.jdbc.GradeJdbcDao">
<property name="jdbcTemplate" ref="jtaTestBTemplate"/>
</bean>
<!--跨數據庫的JTA事務的業務類-->
<bean id="myService" class="com.service.impl.MyServiceImpl">
<property name="userDao" ref="userDao"/>
<property name="gradeDao" ref="gradeDao"/>
</bean>
<!--注解事務驅動-->
<tx:annotation-driven transaction-manager="txManager" proxy-target-class="true"/>
</beans>
7、測試main方法:
Java代碼
import com.service.MyService;
import com.service.impl.MyServiceImpl;
import com.domain.*;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestMain {
public static void main(String args[]){
ClassPathXmlApplicationContext ctx =
new ClassPathXmlApplicationContext("beans_jta.xml");
MyService ms = (MyServiceImpl)ctx.getBean("myService");
User user = new User();
//特意添加一個重復的主鍵,以使添加user的事務失敗並回退
//如果此時應用JTA事務失敗,將仍會執行添加grade的事務並提交(前提是先於添加user操作)
//如果應用JTA事務成功,就會兩個添加事務同時執行或同時回退。
user.setUser_id(1);
user.setUser_name("tufu");
user.setUser_password("tufu");
Grade grade = new Grade();
grade.setGrade(100);
grade.setUser(user);
ms.addGrade(user,grade);
}
}
import com.service.MyService;
import com.service.impl.MyServiceImpl;
import com.domain.*;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestMain {
public static void main(String args[]){
ClassPathXmlApplicationContext ctx =
new ClassPathXmlApplicationContext("beans_jta.xml");
MyService ms = (MyServiceImpl)ctx.getBean("myService");
User user = new User();
//特意添加一個重復的主鍵,以使添加user的事務失敗並回退
//如果此時應用JTA事務失敗,將仍會執行添加grade的事務並提交(前提是先於添加user操作)
//如果應用JTA事務成功,就會兩個添加事務同時執行或同時回退。
user.setUser_id(1);
user.setUser_name("tufu");
user.setUser_password("tufu");
Grade grade = new Grade();
grade.setGrade(100);
grade.setUser(user);
ms.addGrade(user,grade);
}
}
注:將log4j.properties中的log4j日志設置為DEBUG級別,可以看到詳細的JTA事務執行情況:
.......
log4j.rootLogger=DEBUG,R,A1
.......
文章來源:http://mrzhangtufu.javaeye.com/blog/241594