本文介绍基于spring+mybatis+tkmapper+atomikos+jta实现分布式事务,由程序动态切换数据源,通过atomikos可实现分布式事务一致性。通过继承MapperScannerConfigurer、MapperFactoryBean等类,解决多数据源时,切换到第一个数据源之外的数据源时,找不到tk的Mapper上的方法的问题。
版本:spring-3.2.9.RELEASE、mybatis-3.4.4、atomikos-4.0.5、jdk1.8、tk.mybatis-3.4.3
1,maven配置文件pom.xml如下:
junit
junit
4.12
test
hamcrest-core
org.hamcrest
org.hamcrest
hamcrest-all
1.3
test
org.mockito
mockito-core
1.9.5
test
hamcrest-core
org.hamcrest
com.jayway.jsonpath
json-path
0.8.1
test
org.springframework
spring-aop
${spring.version}
org.springframework
spring-beans
${spring.version}
org.springframework
spring-context
${spring.version}
org.springframework
spring-core
${spring.version}
org.springframework
spring-expression
${spring.version}
org.springframework
spring-web
${spring.version}
org.springframework
spring-webmvc
${spring.version}
org.springframework
spring-webmvc-portlet
${spring.version}
org.springframework
spring-tx
${spring.version}
org.springframework
spring-jdbc
${spring.version}
org.springframework
spring-test
3.2.18.RELEASE
org.springframework
spring-struts
${spring.version}
org.mybatis
mybatis
3.4.4
org.mybatis
mybatis-spring
1.3.1
tk.mybatis
mapper
3.4.3
mysql
mysql-connector-java
5.1.27
com.atomikos
transactions-jdbc
4.0.5
javax.transaction
jta
1.1
org.codehaus.jackson
jackson-mapper-asl
1.9.13
org.codehaus.jackson
jackson-core-asl
1.9.13
org.aspectj
aspectjweaver
1.8.13
log4j
log4j
1.2.16
javax.servlet
servlet-api
2.5
provided
2,数据库连接配置文件:jdbc.properties
jdbc.xaDataSourceClassName=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
validationQuery=select 1
ds1.jdbc.url=jdbc:mysql://xx.xx.xx.xx:3306/test1?characterEncoding=UTF-8
ds1.jdbc.username=xxxx
ds1.jdbc.password=xxxx
ds2.jdbc.url=jdbc:mysql://xx.xx.xx.xx:3306/test2?characterEncoding=UTF-8
ds2.jdbc.username=xxxx
ds2.jdbc.password=xxxx
3,atomikos配置文件: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
4,spring-datasource-jta.xml
classpath*:jdbc.properties
${ds1.jdbc.url}
${ds1.jdbc.username}
${ds1.jdbc.password}
${ds2.jdbc.url}
${ds2.jdbc.username}
${ds2.jdbc.password}
true
5,spring-mybatis-tk-dynamic.xml
classpath:mybatis/tk/model/*.xml
classpath:mybatis/tk/model/*.xml
6,编写mybatis.tk.model代码,HelloDO.java、HelloMapper.java
package mybatis.tk.model;
import javax.persistence.Id;
import javax.persistence.Table;
@Table(name = "HELLO")
public class HelloDO {
@Id
private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
HelloMapper.java
package mybatis.tk.model;
import org.springframework.stereotype.Repository;
import tk.mybatis.mapper.common.Mapper;
@Repository(value="helloMapper")
public interface HelloMapper extends Mapper {
}
7,编写service类:HelloWorldService.java
package mybatis.tk.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import mybatis.tk.model.HelloDO;
import mybatis.tk.model.HelloMapper;
@Service("helloWorldService")
public class HelloWorldService {
@Autowired
private HelloMapper helloMapper;
public void addHello(HelloDO helloDO) {
// TODO Auto-generated method stub
helloMapper.insert(helloDO);
}
}
8,编写controller类:HelloWorldController.java
package mybatis.tk.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import mybatis.tk.model.HelloDO;
import mybatis.tk.service.HelloWorldService;
import spring.jta.util.DataSourceContextHolder;
@Controller(value = "helloWorldController")
@RequestMapping(value = "/hello")
public class HelloWorldControler {
@Autowired
private HelloWorldService helloWorldService;
@Transactional
@RequestMapping(value="create",method=RequestMethod.POST)
public @ResponseBody long createHelloDynamic(@RequestBody HelloDO helloDO) {
DataSourceContextHolder.setDBType("dataSource");
helloWorldService.addHello(helloDO);
DataSourceContextHolder.setDBType("dataSource2");
helloWorldService.addHello(helloDO);
return helloDO.getId();
}
}
9,编写测试类:HelloWorldControlerDynamicTest.java
package mybatis.controller;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectWriter;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4Cla***unner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;
import mybatis.model.HelloDO;
@RunWith(SpringJUnit4Cla***unner.class)
@WebAppConfiguration
@ContextConfiguration({ "classpath:spring-datasource-jta.xml", "classpath:spring-mybatis-dynamic.xml" })
public class HelloWorldControlerDynamicTest {
@Autowired
private WebApplicationContext context;
private MockMvc mocMvc;
@Before
public void setUp() throws Exception {
mocMvc = MockMvcBuilders.webAppContextSetup(context).build();
}
@Test
public void test() throws Exception {
String data = "{\"id\":1,\"name\":\"abc\"}";
HelloDO hello = new HelloDO();
hello.setId(1L);
hello.setName("abc");
ObjectMapper mapper = new ObjectMapper();
ObjectWriter ow = mapper.writer().withDefaultPrettyPrinter();
java.lang.String requestJson = ow.writeValueAsString(hello);
mocMvc.perform(post("/hello/create_dynamic").contentType(MediaType.APPLICATION_JSON).content(data)).andExpect(status().isOk());
}
}
10,编写数据源切换类 DataSourceContextHolder.java
package spring.jta.util;
public class DataSourceContextHolder {
private static final ThreadLocal contextHolder = new ThreadLocal();
public static void setDBType(String dbType) {
contextHolder.set(dbType);
}
public static String getDBType() {
return ((String) contextHolder.get());
}
public static void clearDBType() {
contextHolder.remove();
}
}
11,编写CustomSqlSessionTemplate.java,该类扩展SqlSessionTemplate,结合DataSourceContextHolder实现sqlSession的切换
package spring.jta.util;
import static java.lang.reflect.Proxy.newProxyInstance;
import static org.apache.ibatis.reflection.ExceptionUtil.unwrapThrowable;
import static org.mybatis.spring.SqlSessionUtils.closeSqlSession;
import static org.mybatis.spring.SqlSessionUtils.getSqlSession;
import static org.mybatis.spring.SqlSessionUtils.isSqlSessionTransactional;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.exceptions.PersistenceException;
import org.apache.ibatis.executor.BatchResult;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.MyBatisExceptionTranslator;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.dao.support.PersistenceExceptionTranslator;
import org.springframework.util.Assert;
/**
* function: 继承SqlSessionTemplate 重写相关方法
* @author hoojo
* @createDate 2013-10-18 下午03:07:46
* @file CustomSqlSessionTemplate.java
* @package com.hoo.framework.mybatis.support
* @project SHMB
* @blog http://blog.csdn.net/IBM_hoojo
* @email [email protected]
* @version 1.0
*/
public class CustomSqlSessionTemplate extends SqlSessionTemplate {
private final SqlSessionFactory sqlSessionFactory;
private final ExecutorType executorType;
private final SqlSession sqlSessionProxy;
private final PersistenceExceptionTranslator exceptionTranslator;
private Map
12,编写MapperFactoryBean.java,该类继承org.mybatis.spring.mapper.MapperFactoryBean,通过重写checkDaoConfig(),把tk的Mapper接口的所有方法配置到org.apache.ibatis.session.Configuration上,解决多个数据源时找不到方法的问题。
package spring.jta.util;
import java.util.List;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.session.Configuration;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import tk.mybatis.mapper.mapperhelper.MapperHelper;
public class MapperFactoryBean extends org.mybatis.spring.mapper.MapperFactoryBean implements ApplicationContextAware{
private MapperHelper mapperHelper;
private String sqlSessionTemplateBeanName;
private ApplicationContext applicationContext;
public MapperFactoryBean() {
super();
}
public MapperFactoryBean(Class mapperInterface) {
super(mapperInterface);
}
public void setSqlSessionTemplateBeanName(String sqlSessionTemplateBeanName) {
this.sqlSessionTemplateBeanName = sqlSessionTemplateBeanName;
}
public void setMapperHelper(MapperHelper mapperHelper) {
this.mapperHelper = mapperHelper;
}
@Override
protected void checkDaoConfig() {
CustomSqlSessionTemplate customSqlSessionTemplate = (CustomSqlSessionTemplate)this.applicationContext.getBean(this.sqlSessionTemplateBeanName);
List configurations = customSqlSessionTemplate.getAllConfigurations();
for (Configuration configuration : configurations) {
if (isAddToConfig() && !configuration.hasMapper(getMapperInterface())) {
try {
configuration.addMapper(getMapperInterface());
} catch (Exception e) {
logger.error("Error while adding the mapper '" + getMapperInterface() + "' to configuration.", e);
throw new IllegalArgumentException(e);
} finally {
ErrorContext.instance().reset();
}
}
// 通用Mapper
if (mapperHelper.isExtendCommonMapper(getObjectType())) {
mapperHelper.processConfiguration(configuration, getObjectType());
}
}
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
// TODO Auto-generated method stub
this.applicationContext = applicationContext;
}
}
13,编写MyMapperScannerConfigurer.java,该类继承org.mybatis.spring.mapper.MapperScannerConfigurer
package spring.jta.util;
import java.util.Properties;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import tk.mybatis.mapper.common.Marker;
import tk.mybatis.mapper.mapperhelper.MapperHelper;
import tk.mybatis.mapper.util.StringUtil;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
public class MyMapperScannerConfigurer extends MapperScannerConfigurer {
private MapperHelper mapperHelper = new MapperHelper();
private String sqlSessionTemplateBeanName;
public void setMarkerInterface(Class> superClass) {
super.setMarkerInterface(superClass);
if (Marker.class.isAssignableFrom(superClass)) {
mapperHelper.registerMapper(superClass);
}
}
public MapperHelper getMapperHelper() {
return mapperHelper;
}
public void setMapperHelper(MapperHelper mapperHelper) {
this.mapperHelper = mapperHelper;
}
public void setSqlSessionTemplateBeanName(String sqlSessionTemplateBeanName) {
super.setSqlSessionTemplateBeanName(sqlSessionTemplateBeanName);
this.sqlSessionTemplateBeanName = sqlSessionTemplateBeanName;
}
/**
* 属性注入
*
* @param properties
*/
public void setProperties(Properties properties) {
mapperHelper.setProperties(properties);
}
@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) {
super.postProcessBeanDefinitionRegistry(registry);
// 如果没有注册过接口,就注册默认的Mapper接口
this.mapperHelper.ifEmptyRegisterDefaultInterface();
String[] names = registry.getBeanDefinitionNames();
GenericBeanDefinition definition;
for (String name : names) {
BeanDefinition beanDefinition = registry.getBeanDefinition(name);
if (beanDefinition instanceof GenericBeanDefinition) {
definition = (GenericBeanDefinition) beanDefinition;
if (StringUtil.isNotEmpty(definition.getBeanClassName())
&& definition.getBeanClassName().equals("org.mybatis.spring.mapper.MapperFactoryBean")) {
definition.setBeanClass(MapperFactoryBean.class);
definition.getPropertyValues().add("mapperHelper", this.mapperHelper);
definition.getPropertyValues().add("sqlSessionTemplateBeanName",
this.sqlSessionTemplateBeanName);
}
}
}
}
}