在Springboot中如何配置全局的transaction事务

布满荆棘的人生 2022-11-11 13:19 662阅读 0赞

# 问题 #

一般来说，springboot实现事务只需要 在public方法头上加上@Transactional注解即可，@Transactional 默认只捕获RuntimeException.class，对Exception异常得需要 @Transactional(rollbackFor = \{Exception.class\}) 捕获回滚。这个有个问题就是：当项目特别大的时候，对所有的service 都去加上事务 ，显得非常麻烦。

# 方案 #

可以通过spring AOP 方式实现配置全局的transaction事务。JAVA代码例子如下：

package com.demo.app.datasource;
    
    import com.demo.framelib.datasource.MultipleDataSource;
    import org.aspectj.lang.annotation.Aspect;
    import org.springframework.aop.Advisor;
    import org.springframework.aop.aspectj.AspectJExpressionPointcut;
    import org.springframework.aop.support.DefaultPointcutAdvisor;
    import org.springframework.beans.factory.annotation.Qualifier;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.autoconfigure.AutoConfigureAfter;
    import org.springframework.context.annotation.Bean;
    import org.springframework.jdbc.datasource.DataSourceTransactionManager;
    import org.springframework.stereotype.Component;
    import org.springframework.transaction.TransactionDefinition;
    import org.springframework.transaction.interceptor.*;
    
    import java.util.Collections;
    import java.util.HashMap;
    import java.util.Map;
    
    /**
     * Description:事务操作类.
      事务管理配置，拦截指定包下所有方法
     */
    @Aspect
    @Component
    @AutoConfigureAfter(MultipleDataSourceConfiguration.class)
    public class TxAdviceInterceptor {
    
        /**
         * basicDataSource.
         */
        @Value("${tx_method_timeout}")
        private int txMethodTimeout;
        /**
         * basicDataSource.
         */
        @Value("${aop_pointcut_expression}")
        private String aopPointcutExpression;
        
        /**
         * DataSourceTransactionManager.
         * @param multipleDataSource multipleDataSource
         * @return dataSourceTransactionManager.
         */
        @Bean(name = "dataSourceTransactionManager")
        public DataSourceTransactionManager dataSourceTransactionManager(
                @Qualifier("multipleDataSource") MultipleDataSource multipleDataSource) {
            DataSourceTransactionManager dataSourceTransactionManager =
                    new DataSourceTransactionManager();
            dataSourceTransactionManager.setDataSource(multipleDataSource);
            return dataSourceTransactionManager;
        }
        
        /**
         * 事务配置
         */
        @Bean(name = "txAdvice")
        public TransactionInterceptor txAdvice(
                @Qualifier("dataSourceTransactionManager") DataSourceTransactionManager dataSourceTransactionManager) {
            /* 只读事务，不做更新操作 */
            RuleBasedTransactionAttribute readOnlyTx = new RuleBasedTransactionAttribute();
            readOnlyTx.setReadOnly(true);
            readOnlyTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_NOT_SUPPORTED);
    
            /* 当前存在事务就使用当前事务，当前不存在事务就创建一个新的事务 */
            RuleBasedTransactionAttribute requiredTx = new RuleBasedTransactionAttribute();
            requiredTx.setRollbackRules(Collections.singletonList(new RollbackRuleAttribute(Exception.class)));
            requiredTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
            /*requiredTx.setTimeout(txMethodTimeout);*/
            Map<String, TransactionAttribute> txMap = new HashMap<>();
            txMap.put("add*", requiredTx);
            txMap.put("create*", requiredTx);
            txMap.put("modify*", requiredTx);
            txMap.put("save*", requiredTx);
            txMap.put("insert*", requiredTx);
            txMap.put("update*", requiredTx);
            txMap.put("delete*", requiredTx);
            txMap.put("remove*", requiredTx);
            txMap.put("get*", readOnlyTx);
            txMap.put("query*", readOnlyTx);
            NameMatchTransactionAttributeSource source = new NameMatchTransactionAttributeSource();
            source.setNameMap(txMap);
            TransactionInterceptor txAdvice =
                    new TransactionInterceptor(dataSourceTransactionManager, source);
            return txAdvice;        
        }
    
        /**
         * 利用AspectJExpressionPointcut设置切点
         */
        @Bean(name = "txPointcut")
        public AspectJExpressionPointcut txPointcut() {
            AspectJExpressionPointcut txPointcut = new AspectJExpressionPointcut();
            txPointcut.setExpression(aopPointcutExpression);
            return txPointcut;
        }
        
        /**
          * 声明切面(Aspect）：切面就是通知和切入点的结合。
          * 通知和切入点共同定义了关于切面的全部内容——它的功能、在何时和何地完成其功能
          */
        @Bean
        public Advisor txAdviceAdvisor(
            @Qualifier("txAdvice") TransactionInterceptor txAdvice,
            @Qualifier("txPointcut") AspectJExpressionPointcut txPointcut) {        
            DefaultPointcutAdvisor defaultPointcutAdvisor = new DefaultPointcutAdvisor(txPointcut, txAdvice);
            defaultPointcutAdvisor.setOrder(2);
            return defaultPointcutAdvisor;
        }
    }