Question

如何在Spring集成（Java DSL）中为完整流定义事务？

使用Spring集成，我们可以使用以下内容定义示例流程：

@Bean
public IntegrationFlow myMessageFromMessageAmqpInboundFlow() {
    return IntegrationFlows.from(myInboundChannel)
            .transform(aMessageTransformer)
            .transform(anotherMessageTransformer)
            .channel(anOutputChannel)
            .get();
}

我需要一个超过完整流量的交易。目前，当我使用'aMessageTransformer'访问数据库时，在处理完此消息转换后，事务将被关闭。但是我需要一个在处理'anotherMessageTransformer'时仍未提交的事务？

我预计我只需添加'@Transactional'（或@Transactional（propagation = Propagation.REQUIRED，readOnly = true））

@Bean
@Transactional
public IntegrationFlow myMessageFromMessageAmqpInboundFlow() {
    return IntegrationFlows.from(myInboundChannel)
            .transform(aMessageTransformer)
            .transform(anotherMessageTransformer)
            .channel(anOutputChannel)
            .get();
}

但这导致'anotherMessageTransformer'中的'无会话异常'

Answer 1

您需要关注此documentation，然后将其添加到您的流程中：

.transform(aMessageTransformer, e -> e.transactional(true))

.transactional()所在的地方：

/**
 * Specify a {@link TransactionInterceptor} {@link Advice} with default
 * {@code PlatformTransactionManager} and {@link DefaultTransactionAttribute} for the
 * {@link MessageHandler}.
 * @param handleMessageAdvice the flag to indicate the target {@link Advice} type:
 * {@code false} - regular {@link TransactionInterceptor}; {@code true} -
 * {@link org.springframework.integration.transaction.TransactionHandleMessageAdvice}
 * extension.
 * @return the spec.
 */
public S transactional(boolean handleMessageAdvice) {

TransactionHandleMessageAdvice表示：

* When this {@link Advice} is used from the {@code request-handler-advice-chain}, it is applied
 * to the {@link MessageHandler#handleMessage}
 * (not to the
 * {@link org.springframework.integration.handler.AbstractReplyProducingMessageHandler.RequestHandler#handleRequestMessage}),
 * therefore the entire downstream process is wrapped to the transaction.

如何处理Spring集成流程的事务（Java DSL）

1 个答案: