Spring JTA应用之Atomikos配置

Atomikos,是一个基于Java的开源事务管理器，提供了事务管理和连接池，不需要应用服务器支持，支持JDBC和JMS事务，能提供对Spring，Hibernate的集成，有兴趣多了解的可以直接参考说明文当，有详细的介绍和使用说明。

Atomikos可以到http://www.atomikos.com/products.html#ate下载,最新版本是3.2.0

首先,仍然是一个相关的配置文件，用来设置相关的环境,打开解压缩后Atomikos根目录,拷贝jta.properties到classpath中，并修改为如下内容
jta.properties

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

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

随后，是Spring上下文配置，建立一个名为ApplicationContext-atomikos.xml的Spring上下文

ApplicationContext-atomikos.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
    <!-- XA Datasource -->
    <bean id="datasource1" class="com.atomikos.jdbc.SimpleDataSourceBean" init-method="init" destroy-method="close">
        <property name="uniqueResourceName">
            <value>mysql/main</value>
        </property>
        <property name="xaDataSourceClassName">
            <value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>
        </property>
        <property name="xaDataSourceProperties">
            <value>URL=jdbc:mysql://localhost:3306/test;user=root;password=admin</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="datasource2" class="com.atomikos.jdbc.SimpleDataSourceBean" init-method="init" destroy-method="close">
        <property name="uniqueResourceName">
            <value>mysql/news</value>
        </property>
        <property name="xaDataSourceClassName">
            <value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>
        </property>
        <property name="xaDataSourceProperties">
            <value>URL=jdbc:mysql://localhost:3306/test2;user=root;password=admin</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="template1" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="datasource1" />
    </bean>

    <bean id="template2" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="datasource2" />
    </bean>

    <bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" init-method="init" destroy-method="close">
        <property name="forceShutdown"><value>true</value></property>
    </bean>

    <bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp">
        <property name="transactionTimeout" value="300"/>
    </bean>

    <bean id="springTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManager"><ref bean="atomikosTransactionManager"  /></property>
        <property name="userTransaction"><ref bean="atomikosUserTransaction"  /></property>
    </bean>

    <bean id="dao1" class="com.xa.dao.UserDao1">
        <property name="jdbcTemplate">
            <ref bean="template1"></ref>
        </property>
    </bean>

    <bean id="dao2" class="com.xa.dao.UserDao2">
        <property name="jdbcTemplate">
            <ref bean="template2"></ref>
        </property>
    </bean>
    <!-- -->
    <bean id="userServiceTarget" class="com.xa.service.UserServiceImpl">
        <property name="dao1" ref="dao1"/>
        <property name="dao2" ref="dao2"/>
    </bean>

    <bean id="userTest" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        <property name="transactionManager">
            <ref bean="springTransactionManager"/>
        </property>
        <property name="target">
            <ref bean="userServiceTarget"/>
        </property>
        <property name="transactionAttributes">
            <props>
                <prop key="insert*">PROPAGATION_REQUIRED,-Exception</prop>
            </props>
        </property>
    </bean>
</beans>

看上下文中的代码，很大部分和JOTM的相似，atomikos使用com.atomikos.jdbc.SimpleDataSourceBean类来创建datasource bean，这里需要特别注意

<property name="uniqueResourceName">
    <value>mysql/main</value>
</property>

<property name="uniqueResourceName"> <value>mysql/main</value> </property>

 

<property name="uniqueResourceName">
    <value>mysql/news</value>
</property>

<property name="uniqueResourceName"> <value>mysql/news</value> </property>

上面的代码为每个Datasource配置了一个唯一的名称，名称不允许相同，否则将会使用同一个datasource，而不会出现异常。

另外在配置文件中定义了Atomikos的事务管理器，并在Spring的JtaTransactionManager中引用

Java代码

<bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" init-method="init" destroy-method="close">
        <property name="forceShutdown"><value>true</value></property>
    </bean>

    <bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp">
        <property name="transactionTimeout" value="300"/>
    </bean>

    <bean id="springTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManager"><ref bean="atomikosTransactionManager"  /></property>
        <property name="userTransaction"><ref bean="atomikosUserTransaction"  /></property>
    </bean>

其它的代码没什么特别，和JOTM配置基本相同，JdbcTemplate，DAO，Service，事务代理等等....

仍然使用TestXa.java，修改成引用ApplicationContext-atomikos.xml的上下文配置

protected String[] getConfigLocations() {
    //return new String[] { "classpath:ApplicationContext-jotm.xml" };
    return new String[] { "classpath:ApplicationContext-atomikos.xml" };
}

protected String[] getConfigLocations() { //return new String[] { "classpath:ApplicationContext-jotm.xml" }; return new String[] { "classpath:ApplicationContext-atomikos.xml" }; }

运行test，然后查看数据库状态，
然后修改方法参数使其不违反数据库约束，再运行Test观察数据库。