JMSTemplate中的setSessionTransacted到底是什么意思? [英] What precisely means setSessionTransacted in JMSTemplate?

问题描述

如果我对Spring文档的理解正确，请向我解释.

Please explain me if I understood correctly Spring documentation.

Spring docs指出: https ://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#jms-tx

Spring docs states: https://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#jms-tx

(...)在非托管环境中使用JmsTemplate时，可以通过使用sessionTransacted和sessionAcknowledgeMode属性来指定这些值(事务和确认模式).

当将PlatformTransactionManager与JmsTemplate一起使用时，始终为该模板提供一个事务性JMS会话.(..)

When you use a PlatformTransactionManager with JmsTemplate, the template is always given a transactional JMS Session.(..)

(顺便说一句，这是正确的-会话是事务性的)

Javadoc状态:

Javadoc states : https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/jms/core/JmsTemplate.html

JMS会话的默认设置为未交易"，默认设置为不交易".和自动确认".根据Java EE规范的定义，当在活动事务中创建JMS会话时，无论JTA事务还是 Spring管理的事务，事务和确认参数都将被忽略.

Default settings for JMS Sessions are "not transacted" and "auto-acknowledge". As defined by the Java EE specification, the transaction and acknowledgement parameters are ignored when a JMS Session is created inside an active transaction, no matter if a JTA transaction or a Spring-managed transaction.

我了解到，如果事务处于活动状态，则JMS模板会话的事务设置将被忽略-这是真的-并且会话应参与活动事务- 这不是事实 .

I understood that if transaction is active, JMS Template session transaction settings are ignored - that is true - and the session should participate active transaction - that is not true.

我调试了为什么它不是真的，然后发现: https://github.com/spring-projects/spring-framework/blame/master/spring-jms/src/main/java/org/springframework/jms/connection/ConnectionFactoryUtils.java#L353

I debug why it is not true and I found: https://github.com/spring-projects/spring-framework/blame/master/spring-jms/src/main/java/org/springframework/jms/connection/ConnectionFactoryUtils.java#L353

if (resourceHolderToUse != resourceHolder) {
  TransactionSynchronizationManager.registerSynchronization(
    new JmsResourceSynchronization(resourceHolderToUse, connectionFactory,
                             
 resourceFactory.isSynchedLocalTransactionAllowed()));
 resourceHolderToUse.setSynchronizedWithTransaction(true);
 TransactionSynchronizationManager.bindResource(connectionFactory, resourceHolderToUse);
}

resourceHolderToUse.setSynchronizedWithTransaction(true)行是对齐文档.

此处的问题:resourceFactory.isSynchedLocalTransactionAllowed()

因为resourceFactory是org.springframework.jms.core.JmsTemplate.JmsTemplateResourceFactory#isSynchedLocalTransactionAllowed，它指向JmsTemplate#sessionTransacted.

Because resourceFactory is org.springframework.jms.core.JmsTemplate.JmsTemplateResourceFactory#isSynchedLocalTransactionAllowed which points to JmsTemplate#sessionTransacted.

结论: 根据文档，如果事务处于活动状态，则应忽略JmsTemplate#sessionTransacted.但这不是事实-尽管会话是事务性的，但不能参与提交.

Conclusion: According to documentation, if transaction is active, JmsTemplate#sessionTransacted should be ignored. But it is not true - although session is transactional, cannot not participate in commit.

JmsTemplate#sessionTransacted最终映射到ConnectionFactoryUtils.JmsResourceSynchronization#transacted，并且default = false防止在事务结束时调用提交(JmsResourceSynchronization认为"它不参与事务)

JmsTemplate#sessionTransacted is finally mapped to ConnectionFactoryUtils.JmsResourceSynchronization#transacted and default=false prevents commit being called at the end of transaction (JmsResourceSynchronization "thinks" that it does not participate transaction)

我对文档的理解正确吗，这里确实有错误吗?

Do I understand documentation right and there is really bug here?

推荐答案

在M. Deinum的指导下，我进行了更多实验，似乎我误解了 Spring管理的交易

Guided by M. Deinum, I made more experiments and it seems I wrongly understood term Spring-managed transaction

我只是认为Spring托管事务是由platformTransactionManager启动的.但是:

I simply thought that Spring managed transaction is started by platformTransactionManager. But:

1. 如果platformTransactionManager是JtaTransactionManager且事务已启动，则它是 IS Spring管理的事务； JMS模板属性 sessionTransacted 被忽略，JMS模板是事务的一部分
2. 如果platformTransactionManager是DataSourceTransactionManager或JpaTransactionManager，则
   • 如果sessionTransacted为false，则表明JMS模板不在事务中
   • 如果sessionTransacted为true，则JMS模板与事务同步:在JDBC/JPA事务上进行回调/回滚之后，在JMS事务上调用相应的提交/回滚

1. If platformTransactionManager is JtaTransactionManager and transaction is started, it IS Spring managed transaction; JMS template attribute sessionTransacted is ignored and JMS template is part of transaction
2. if platformTransactionManager is DataSourceTransactionManager or JpaTransactionManager then
   • if sessionTransacted is false, JMS template is not in transaction
   • if sessionTransacted is true, JMS template is synchronized with transaction: after callback/rollback on JDBC/JPA transaction correspondent commit/rollback is called on JMS transaction

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