分佈式事務之xa：atomikos

須知：該博客是多數據源的事務問題，還未涉及微服務的事務

 

1、導入核心的依賴包

<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、配置多數據源

##account表數據庫配置
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
## 配置獲取連接等待超時的時間
spring.atomikos.datasource.account.xa-properties.maxWait=60000
# 配置間隔多久才進行一次檢測，檢測需要關閉的空閒連接，單位是毫秒
spring.atomikos.datasource.account.xa-properties.timeBetweenEvictionRunsMillis=60000
# 配置一個連接在池中最小生存的時間，單位是毫秒
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
# 打開PSCache，並且指定每個連接上PSCache的大小
spring.atomikos.datasource.account.xa-properties.poolPreparedStatements=true
spring.atomikos.datasource.account.xa-properties.maxPoolPreparedStatementPerConnectionSize=20
# 配置監控統計攔截的filters，去掉後監控界面sql無法統計，'wall'用於防火牆
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表數據庫配置
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
# 配置監控統計攔截的filters，去掉後監控界面sql無法統計，'wall'用於防火牆
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：將配置的數據庫連接信息，注入數據源，並且設置druid的監控中心。

MybatisConfiguration ：配置DataSource

@Configuration
@EnableConfigurationProperties
@EnableTransactionManagement(proxyTargetClass = true)
public class MybatisConfiguration {
    /**
     * account數據庫配置前綴.
     */
    final static String ACCOUNT_PREFIX = "spring.atomikos.datasource.account";
    /**
     * redpacket數據庫配置前綴.
     */
    final static String REDPACKET_PREFIX = "spring.atomikos.datasource.redpacket";

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

    /**
     * 配置druid顯示監控統計信息
     * 開啓Druid的監控平臺 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白名單，不設默認都可以
//        servletRegistrationBean.addInitParameter("allow", "192.168.2.25,127.0.0.1");
        // IP黑名單(共同存在時，deny優先於allow)
        servletRegistrationBean.addInitParameter("deny", "192.168.1.100");
        //控制檯管理用戶
        servletRegistrationBean.addInitParameter("loginUsername", "root");
        servletRegistrationBean.addInitParameter("loginPassword", "root");
        //是否能夠重置數據 禁用HTML頁面上的“Reset All”功能
        servletRegistrationBean.addInitParameter("resetEnable", "false");
        return servletRegistrationBean;
    }

    /**
     * 註冊一個filterRegistrationBean
     *
     * @return filter registration bean
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //添加過濾規則
        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數據庫的數據源
     *
     * @return the data source
     */
    @Bean(name = "AccountDataSource")
    @ConfigurationProperties(prefix = ACCOUNT_PREFIX)  // application.properties中對應屬性的前綴
    public DataSource accountDataSource() {
        return new AtomikosDataSourceBean();
    }

    /**
     * 配置RedPacket數據庫的數據源
     *
     * @return the data source
     */
    @Bean(name = "RedPacketDataSource")
    @ConfigurationProperties(prefix = REDPACKET_PREFIX)  // application.properties中對應屬性的前綴
    public DataSource redPacketDataSource() {
        return new AtomikosDataSourceBean();
    }
}

AccountDataSourceConfiguration 作用：配置account的數據源的sessionfactory ,同時關聯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工廠
     *
     * @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文件路徑
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MAPPER_XML_LOCATION));
        return factoryBean.getObject();
    }
}

RedAccountDataSourceConfiguration 作用：配置RedAccount的數據源的sessionfactory ,同時關聯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體驗 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);
        //賬戶餘額扣除
        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);
        //紅包餘額扣除
        redDTO.setBalanceAmount(redDTO.getBalanceAmount()-redAccount);
        this.redPacketAccountMapper.updateByPrimaryKey(redDTO);
        //int n=9/0;//測試
    }
}

第五步： junit 測試

@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的日誌
1.如何測試atomikos的事務運行結果？
  查看Atomikos的日誌，默認情況下，在項目的根目錄下會自動創建transaction-logs文件夾，每個Atomikos實例都會有一個全局ID，這個ID爲Atomikos運行機器的IP地址；
  這個唯一ID會自動關聯多個數據庫的事務信息，也就是會關聯分支事務id.
 
2.atomikos日誌的自定義配置
spring.jta.log-dir=transaction-logs