How to create Synchronous consumer API for Rabbit MQ in java to fetch message from the Queue

Question

I want a Synchronous API for Rabbit MQ in java like QueueingConsumer so that I can fetch message from the Rabbit MQ. But QueueingConsumer is now deprecated. Can anyone please tell me how can I write one of my own.

Reason for Synchronous Consumer - I am writing REST service which will fetch message from Queue and return it as a response.

Answer 1

I. As I understand, you are using of rabbitmq java client. In this case you should do something like this:

1. Generate correlationId , replyTo propertiesж
2. Create/Get destination queue/exchange (your destination);
3. Create/Get response queue (your queue for responses);
4. Add correlationId and replyTo to your message;
5. Send your message by channel.basicPublish() to queue/exchange (your destination);
6. Subscribe to response queue by channel.basicConsume() ;
7. When will you get the response message by channge.basicConsume() just check correlationId of incoming message.
8. If correlationId is match – return received message;

Full code example here .

Also you could find comprehensive answer to your question here .

II . If you need a ready-made solution I think you could useSpring AMQP library or any other high-level library. The list of libraries can be found here .