使用nhmicro提供的micro-datasource嵌入式的解决微服务架构中分布式事务问题

<dependency>

<groupId>com.github.jeffreyning</groupId>

<artifactId>nh-micro-datasource</artifactId>

<version>1.0.0-RELEASE</version>

</dependency>

<dependency>

<groupId>com.github.jeffreyning</groupId>

<artifactId>nh-micro-datasource-msg</artifactId>

<version>1.0.0-RELEASE</version>

</dependency>

<!– micro分布式数据源 -->

     <bean id="local_xa_dataSource" class="com.nh.micro.datasource.MicroXaDataSourceFactory" factory-method="createDataSource" init-method=“init”>

       <!– 多个micro分布式数据源实例时可设置不同的dataSourceId 默认为default -->

        <constructor-arg value=“default”/>

       <property name="url" value="${database.url}" />

        <property name="username" value="${database.user}" />

        <property name="password" value="${database.password}" />

        <property name="minSize" value=“5" />

        <property name="maxSize" value=“20" />

       <property name=“dirverClassName” value=“com.mysql.jdbc.Driver” />

       <property name=“validationQuery” value=“select ‘x‘ from dual” />

     </bean>

 <!-- micro动态切换数据源配置 -->

  <bean id="dynamic_xa_dataSource" class="com.nh.micro.datasource.MicroDynamicDataSource" >

  <property name="targetDataSources">   

  <map key-type="java.lang.String">

<!– 设置目标数据源为分布式事务数据源 --> 

  <entry key="local_xa_dataSource" value-ref="local_xa_dataSource"></entry>    

  </map>  

  </property> 

<!-- 默认目标数据源为主库普通数据源 --> 

  <property name="defaultTargetDataSource" ref="dataSource"/>

  </bean>

 <!-- define the Mybatis SqlSessionFactory -->

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<!– Mybatis引入micro动态切换数据源实例 -->

        <property name="dataSource" ref="dynamic_xa_dataSource"/>

        <property name="typeAliasesPackage" value="foo.model"/>

    </bean>

 <aop:config>

        <aop:pointcut id="testPointcut" expression="execution( * foo.repository.TestRep.*(..))"/>

        <aop:advisor pointcut-ref="testPointcut" advice-ref="dataSourceAdvice"/>

    </aop:config>

<!– 设置service层或dao层aop用来动态切换数据源 -->

<bean class="com.nh.micro.datasource.DataSourceAdvice" id="dataSourceAdvice">

        <property name="readMethodList">

            <list>

            </list>

        </property>

</bean>

<aop:config>

        <aop:pointcut id="testPointcut" expression="execution( * foo.repository.TestRep.*(..))"/>

        <aop:advisor pointcut-ref="testPointcut" advice-ref="dataSourceAdvice"/>

    </aop:config>

//Mybatis的Dao接口代码示例,使用@ChangeDataSource注解决定是否切换为分布式事务数据源

package foo.repository;

import java.util.Map;

import com.nh.micro.datasource.ChangeDataSource;

public interface TestRep {

@ChangeDataSource(name="local_xa_dataSource")

public int updateInfo(Map paramMap);

@ChangeDataSource(name="local_xa_dataSource")

public int insertInfo(Map paramMap);

}

//设置xaGroupId和xaBranchId

MicroXaDataSource.setXid(groupId,branchId);

//从Spring中取dao接口对象调用相关业务方法

TestRep testRep=MicroContextHolder.getContext().getBean("testRep");

Map paramMap=new HashMap();

paramMap.put("meta_key", metaKey);

paramMap.put("id", id);

testRep.insertInfo(paramMap);

//可以在其他的线程中根据xaGroupId提交或回滚分布式事务

MicroXaDataSourceFactory.getDataSourceInstance(“default”).commit(groupid);

//设置activemq发送对象，发送commit/rollback命令给其他系统

<bean class="com.nh.micro.datasource.msg.MicroDataSourceJmsReceiver" init-method="init">

<property name="jmsUrl" value="tcp://10.10.xx.xx:61616"></property>

</bean>

//通知其他系统提交的命令是(groupid为参数)

//commit

MicroDataSourceJmsSender.sendXaMsg("commit", groupId);

//rollback

MicroDataSourceJmsSender.sendXaMsg(“rollback", groupId);

//设置activemq接收对象，接收从其他系统发来的commit/rollback命令，MicroDataSourceJmsReceiver内部收到消息后会负责根据groupid提交或回滚事务

<bean class="com.nh.micro.datasource.msg.MicroDataSourceJmsSender">

<property name="jmsUrl" value="tcp://10.10.xx.xx:61616"></property>

</bean>