Spring rabbitMQ - transactions and transaction manager

Question

Iv'e heard all over the internet that rabbitMQ does not support transactions.

Now, that said, spring framework provides us with a rabbit transaction manager:

here is a snippet of its definition:

<bean id="rabbitTransactionManager"
    class="org.springframework.amqp.rabbit.transaction.RabbitTransactionManager">
    <property name="connectionFactory" ref="connectionFactory" />
</bean>

So my question is:

1) does using @transactional annotation on a method with the transaction manager actually guarantees a transaction effect? 2) how does spring managed to achieve transaction while rabbit is non transnational ?

Answer 1

Rabbit does support local transactions. For example in a transaction if something happens in you consumer, and the received message cannot be processed the message is sent back to broker and is not consumed.

Different from other brokers (such as most of the JMS based ones) is that Rabbit does not support distributed transactions (XA transcations). This means you cannot have the same transaction when sending a message over Rabbit and persisting some data in the database.