分布式事务之xa：atomikos

须知：该博客是多数据源的事务问题，还未涉及微服务的事务

 

1、导入核心的依赖包

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jta-atomikos</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>

2、配置多数据源

##account表数据库配置
spring.atomikos.datasource.account.max-pool-size=25
spring.atomikos.datasource.account.min-pool-size=3
spring.atomikos.datasource.account.max-lifetime=20000
spring.atomikos.datasource.account.borrow-connection-timeout=10000
spring.atomikos.datasource.account.unique-resource-name=account
spring.atomikos.datasource.account.xa-properties.url=jdbc:mysql://127.0.0.1:3306/xa_account?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC
spring.atomikos.datasource.account.xa-properties.username=root
spring.atomikos.datasource.account.xa-properties.password=root
spring.atomikos.datasource.account.xa-properties.driverClassName=com.mysql.jdbc.Driver
# 初始化大小，最小，最大
spring.atomikos.datasource.account.xa-properties.initialSize=10
spring.atomikos.datasource.account.xa-properties.minIdle=20
spring.atomikos.datasource.account.xa-properties.maxActive=100
## 配置获取连接等待超时的时间
spring.atomikos.datasource.account.xa-properties.maxWait=60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.atomikos.datasource.account.xa-properties.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.atomikos.datasource.account.xa-properties.minEvictableIdleTimeMillis=300000
spring.atomikos.datasource.account.xa-properties.testWhileIdle=true
spring.atomikos.datasource.account.xa-properties.testOnBorrow=false
spring.atomikos.datasource.account.xa-properties.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.atomikos.datasource.account.xa-properties.poolPreparedStatements=true
spring.atomikos.datasource.account.xa-properties.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.atomikos.datasource.account.xa-properties.filters=stat,slf4j,wall
spring.atomikos.datasource.account.xa-data-source-class-name=com.alibaba.druid.pool.xa.DruidXADataSource

#------------------------------ 分隔符-------------------------------------
##redpacket表数据库配置
spring.atomikos.datasource.redpacket.max-pool-size=25
spring.atomikos.datasource.redpacket.min-pool-size=3
spring.atomikos.datasource.redpacket.max-lifetime=20000
spring.atomikos.datasource.redpacket.borrow-connection-timeout=10000
spring.atomikos.datasource.redpacket.unique-resource-name=redpacket
spring.atomikos.datasource.redpacket.xa-properties.url=jdbc:mysql://127.0.0.1:3306/xa_red_account?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC
spring.atomikos.datasource.redpacket.xa-properties.username=root
spring.atomikos.datasource.redpacket.xa-properties.password=root
spring.atomikos.datasource.redpacket.xa-properties.driverClassName=com.mysql.jdbc.Driver
spring.atomikos.datasource.redpacket.xa-properties.initialSize=10
spring.atomikos.datasource.redpacket.xa-properties.minIdle=20
spring.atomikos.datasource.redpacket.xa-properties.maxActive=100
spring.atomikos.datasource.redpacket.xa-properties.maxWait=60000
spring.atomikos.datasource.redpacket.xa-properties.timeBetweenEvictionRunsMillis=60000
spring.atomikos.datasource.redpacket.xa-properties.minEvictableIdleTimeMillis=300000
spring.atomikos.datasource.redpacket.xa-properties.testWhileIdle=true
spring.atomikos.datasource.redpacket.xa-properties.testOnBorrow=false
spring.atomikos.datasource.redpacket.xa-properties.testOnReturn=false
spring.atomikos.datasource.redpacket.xa-properties.poolPreparedStatements=true
spring.atomikos.datasource.redpacket.xa-properties.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.atomikos.datasource.redpacket.xa-properties.filters=stat,slf4j,wall
spring.atomikos.datasource.redpacket.xa-data-source-class-name=com.alibaba.druid.pool.xa.DruidXADataSource




logging.level.root=INFO

3、第三步：将配置的数据库连接信息，注入数据源，并且设置druid的监控中心。

MybatisConfiguration ：配置DataSource

@Configuration
@EnableConfigurationProperties
@EnableTransactionManagement(proxyTargetClass = true)
public class MybatisConfiguration {
    /**
     * account数据库配置前缀.
     */
    final static String ACCOUNT_PREFIX = "spring.atomikos.datasource.account";
    /**
     * redpacket数据库配置前缀.
     */
    final static String REDPACKET_PREFIX = "spring.atomikos.datasource.redpacket";

    /**
     * The constant logger.
     */
    final static Logger logger = LoggerFactory.getLogger(MybatisConfiguration.class);

    /**
     * 配置druid显示监控统计信息
     * 开启Druid的监控平台 http://localhost:8080/druid
     *
     * @return servlet registration bean
     */
    @Bean
    public ServletRegistrationBean druidServlet() {
        logger.info("Init Druid Servlet Configuration ");
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        // IP白名单，不设默认都可以
//        servletRegistrationBean.addInitParameter("allow", "192.168.2.25,127.0.0.1");
        // IP黑名单(共同存在时，deny优先于allow)
        servletRegistrationBean.addInitParameter("deny", "192.168.1.100");
        //控制台管理用户
        servletRegistrationBean.addInitParameter("loginUsername", "root");
        servletRegistrationBean.addInitParameter("loginPassword", "root");
        //是否能够重置数据 禁用HTML页面上的“Reset All”功能
        servletRegistrationBean.addInitParameter("resetEnable", "false");
        return servletRegistrationBean;
    }

    /**
     * 注册一个filterRegistrationBean
     *
     * @return filter registration bean
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //添加过滤规则
        filterRegistrationBean.addUrlPatterns("/*");
        //添加不需要忽略的格式信息
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }

    /**
     * 配置Account数据库的数据源
     *
     * @return the data source
     */
    @Bean(name = "AccountDataSource")
    @ConfigurationProperties(prefix = ACCOUNT_PREFIX)  // application.properties中对应属性的前缀
    public DataSource accountDataSource() {
        return new AtomikosDataSourceBean();
    }

    /**
     * 配置RedPacket数据库的数据源
     *
     * @return the data source
     */
    @Bean(name = "RedPacketDataSource")
    @ConfigurationProperties(prefix = REDPACKET_PREFIX)  // application.properties中对应属性的前缀
    public DataSource redPacketDataSource() {
        return new AtomikosDataSourceBean();
    }
}

AccountDataSourceConfiguration 作用：配置account的数据源的sessionfactory ,同时关联mybaits

@Configuration
@MapperScan(basePackages = {"com.agan.dtp.atomikos.mapper.account.mapper"}, sqlSessionFactoryRef = "accountSqlSessionFactory")
public class AccountDataSourceConfiguration {
    /**
     * The constant MAPPER_XML_LOCATION.
     */
    public static final String MAPPER_XML_LOCATION = "classpath*:com/transaction/dtp/atomikos/mapper/account/mapper/*.xml";

    /**
     * The Open plat form data source.
     */
    @Autowired
    @Qualifier("AccountDataSource")
    DataSource accountDataSource;

    /**
     * 配置Sql Session模板
     *
     * @return the sql session template
     * @throws Exception the exception
     */
    @Bean
    public SqlSessionTemplate springSqlSessionTemplate() throws Exception {
        return new SqlSessionTemplate(accountSqlSessionFactory());
    }

    /**
     * 配置SQL Session工厂
     *
     * @return the sql session factory
     * @throws Exception the exception
     */
    @Bean
    public SqlSessionFactory accountSqlSessionFactory() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(accountDataSource);
        //指定XML文件路径
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MAPPER_XML_LOCATION));
        return factoryBean.getObject();
    }
}

RedAccountDataSourceConfiguration 作用：配置RedAccount的数据源的sessionfactory ,同时关联mybaits

@Configuration
@MapperScan(basePackages = {"com.agan.dtp.atomikos.mapper.redaccount.mapper"}, sqlSessionFactoryRef = "redPacketSqlSessionFactory")
public class RedAccountDataSourceConfiguration {
    /**
     * The constant MAPPER_XML_LOCATION.
     */
    public static final String MAPPER_XML_LOCATION = "classpath*:com/transaction/dtp/atomikos/mapper/redaccount/mapper/*.xml";

    /**
     * The Open plat form data source.
     */
    @Autowired
    @Qualifier("RedPacketDataSource")
    DataSource redPacketDataSource;

    /**
     * Open plat form sql session template sql session template.
     *
     * @return the sql session template
     * @throws Exception the exception
     */
    @Bean
    public SqlSessionTemplate redPacketSqlSessionTemplate() throws Exception {
        return new SqlSessionTemplate(redPacketSqlSessionFactory());
    }

    /**
     * Open plat form sql session factory sql session factory.
     *
     * @return the sql session factory
     * @throws Exception the exception
     */
    @Bean
    public SqlSessionFactory redPacketSqlSessionFactory() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(redPacketDataSource);
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MAPPER_XML_LOCATION));
        return factoryBean.getObject();
    }
}

第四步：service体验 atomikos

@Service
public class PayServiceImpl implements PayService {

    @Autowired
    private CapitalAccountMapper capitalAccountMapper;
    @Autowired
    private RedPacketAccountMapper redPacketAccountMapper;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void pay(int userId,int account, int redAccount) {
        CapitalAccount ca=new CapitalAccount();
        ca.setUserId(userId);
        CapitalAccount capitalDTO=this.capitalAccountMapper.selectOne(ca);
        System.out.println(capitalDTO);
        //账户余额扣除
        capitalDTO.setBalanceAmount(capitalDTO.getBalanceAmount()-account);
        this.capitalAccountMapper.updateByPrimaryKey(capitalDTO);

        RedPacketAccount red= new RedPacketAccount();
        red.setUserId(userId);
        RedPacketAccount redDTO=this.redPacketAccountMapper.selectOne(red);
        System.out.println(redDTO);
        //红包余额扣除
        redDTO.setBalanceAmount(redDTO.getBalanceAmount()-redAccount);
        this.redPacketAccountMapper.updateByPrimaryKey(redDTO);
        //int n=9/0;//测试
    }
}

第五步： junit 测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class AtomikosTests {

    @Autowired
    PayService payService;

    @Test
    //@Transactional
    public void contextLoads() {
        try {
           this.payService.pay(1,10,10);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

第六步： 查看Atomikos的日志
1.如何测试atomikos的事务运行结果？
  查看Atomikos的日志，默认情况下，在项目的根目录下会自动创建transaction-logs文件夹，每个Atomikos实例都会有一个全局ID，这个ID为Atomikos运行机器的IP地址；
  这个唯一ID会自动关联多个数据库的事务信息，也就是会关联分支事务id.
 
2.atomikos日志的自定义配置
spring.jta.log-dir=transaction-logs