背景
框架之前完成了多数据源的动态切换及事务的处理,想更近一步提供一个简单的跨库事务处理功能,经过网上的搜索调研,大致有XA事务/SEGA事务/TCC事务等方案,因为业务主要涉及政府及企业且并发量不大,所以采用XA事务,虽然性能有所损失,但是可以保证数据的强一致性
方案设计
针对注册的数据源拷贝一份用于XA事务,使得本地事务和XA全局事务相互独立可选择的使用
Maven配置
引入atomikos第三方组件
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< dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-jta-atomikos</ artifactId > </ dependency > |
注册XA数据源
使用Druid连接池,需要使用DruidXADataSource数据源对象,再使用AtomikosDataSourceBean进行包装
注册数据源时针对同一个连接注册两份,一份正常数据源,一份用于XA事务的数据源,数据源标识区分并关联
因为spring默认注册了XA事务管理器后,所有事务操作不再走本地事务,我们通过切换不同的数据源决定走本地事务还是XA事务
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//主数据源xa模式 @Bean @Qualifier ( "masterXADataSource" ) public DataSource masterXADataSource() { DruidXADataSource datasource = new DruidXADataSource(); if (driverClassName.equals( "com.mysql.cj.jdbc.Driver" )){ if (!dbUrl.contains( "useOldAliasMetadataBehavior" )){ dbUrl += "&useOldAliasMetadataBehavior=true" ; } if (!dbUrl.contains( "useAffectedRows" )){ dbUrl += "&useAffectedRows=true" ; } } datasource.setUrl( this .dbUrl); datasource.setUsername(username); datasource.setPassword(password); datasource.setDriverClassName(driverClassName); //configuration datasource.setInitialSize( 1 ); datasource.setMinIdle( 3 ); datasource.setMaxActive( 20 ); datasource.setMaxWait( 60000 ); datasource.setTimeBetweenEvictionRunsMillis( 60000 ); datasource.setMinEvictableIdleTimeMillis( 60000 ); datasource.setValidationQuery( "select 'x'" ); datasource.setTestWhileIdle( true ); datasource.setTestOnBorrow( false ); datasource.setTestOnReturn( false ); datasource.setPoolPreparedStatements( true ); datasource.setMaxPoolPreparedStatementPerConnectionSize( 20 ); datasource.setLogAbandoned( false ); //移除泄露连接发生是是否记录日志 try { datasource.setFilters( "stat,slf4j" ); } catch (SQLException e) { logger.error( "druid configuration initialization filter" , e); } datasource.setConnectionProperties( "druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000" ); //connectionProperties); AtomikosDataSourceBean atomikosDataSourceBean = new AtomikosDataSourceBean(); atomikosDataSourceBean.setXaDataSourceClassName( "com.alibaba.druid.pool.xa.DruidXADataSource" ); atomikosDataSourceBean.setUniqueResourceName( "master-xa" ); atomikosDataSourceBean.setXaDataSource(datasource); atomikosDataSourceBean.setPoolSize( 5 ); atomikosDataSourceBean.setMaxPoolSize( 20 ); atomikosDataSourceBean.setTestQuery( "select 1" ); return atomikosDataSourceBean; } |
注册XA事务管理器
使用spring内置的JtaTransactionManager事务管理器对象,设置AllowCustomIsolationLevels为true,否则指定自定义事务隔离级别会报错
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//xa模式全局事务管理器 @Bean (name = "jtaTransactionManager" ) public PlatformTransactionManager transactionManager() throws Throwable { UserTransactionManager userTransactionManager = new UserTransactionManager(); UserTransaction userTransaction = new UserTransactionImp(); JtaTransactionManager jtaTransactionManager = new JtaTransactionManager(userTransaction, userTransactionManager); jtaTransactionManager.setAllowCustomIsolationLevels( true ); return jtaTransactionManager; } |
定义XA事务切面
自定义注解@GlobalTransactional并定义对应切面,使用指定注解时在ThreadLocal变量值进行标识,组合
@Transactional注解指定XA事务管理器,在切换数据原时判断当前是否在XA事物中,从而切换不同的数据源
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@Target ({ElementType.METHOD}) @Retention (RetentionPolicy.RUNTIME) @Inherited @Documented @Transactional (rollbackFor = Exception. class ,isolation = Isolation.READ_UNCOMMITTED,transactionManager = "jtaTransactionManager" ) public @interface GlobalTransactional { } |
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@Aspect @Component @Order (value = 99 ) public class GlobalTransitionAspect { private static Logger logger = LoggerFactory.getLogger(GlobalTransitionAspect. class ); @Autowired private DynamicDataSource dynamicDataSource; /** * 切面点 指定注解 */ @Pointcut ( "@annotation(com.code2roc.fastkernel.datasource.GlobalTransactional) " + "|| @within(com.code2roc.fastkernel.datasource.GlobalTransactional)" ) public void dataSourcePointCut() { } /** * 拦截方法指定为 dataSourcePointCut */ @Around ( "dataSourcePointCut()" ) public Object around(ProceedingJoinPoint point) throws Throwable { MethodSignature signature = (MethodSignature) point.getSignature(); Method method = signature.getMethod(); GlobalTransactional methodAnnotation = method.getAnnotation(GlobalTransactional. class ); if (methodAnnotation != null ) { DataSourceContextHolder.tagGlobal(); logger.info( "标记全局事务" ); } try { return point.proceed(); } finally { logger.info( "清除全局事务" ); DataSourceContextHolder.clearGlobal(); } } } |
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public class DataSourceContextHolder { private static Logger log = LoggerFactory.getLogger(DataSourceContextHolder. class ); // 对当前线程的操作-线程安全的 private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); private static final ThreadLocal<String> contextGlobalHolder = new ThreadLocal<String>(); // 调用此方法,切换数据源 public static void setDataSource(String dataSource) { contextHolder.set(dataSource); log.debug( "已切换到数据源:{}" , dataSource); } // 获取数据源 public static String getDataSource() { String value = contextHolder.get(); if (StringUtil.isEmpty(value)) { value = "master" ; } if (!StringUtil.isEmpty(getGlobal())) { value = value + "-xa" ; } return value; } // 删除数据源 public static void clearDataSource() { contextHolder.remove(); log.debug( "已切换到主数据源" ); } //====================全局事务标记================ public static void tagGlobal() { contextGlobalHolder.set( "1" ); } public static String getGlobal() { String value = contextGlobalHolder.get(); return value; } public static void clearGlobal() { contextGlobalHolder.remove(); } //=================================================== } |
配置XA事务日志
通过在resource文件夹下创建transactions.properties文件可以指定XA事务日志的存储路径
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com.atomikos.icatch.log_base_dir= tempfiles/transition/ |
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原文链接:https://www.cnblogs.com/yanpeng19940119/p/16332663.html