Spring cloud stream RabbitMQ routing messages dynamically

Question

I have implemented the example as shown here Spring Dynamic Destination

In the rabbitmq, it is creating an exchange dynamically, but there is no option to provide binding or routing key. My requirement is to send a message to this dynamically created exchange with a routing key. How would i need to implement this to setup the routing key?

@Component
public class DDProducerBean {

    @Autowired
    private BinderAwareChannelResolver poChannelResolver = null;

    public void publish(DDSocketVO ddSocketVO) throws Exception {
        this.poChannelResolver.resolveDestination(ddSocketVO.getDestination()).send(MessageBuilder.withPayload(new ObjectMapper().
                setVisibility(PropertyAccessor.FIELD, Visibility.ANY).
                writeValueAsString(ddSocketVO)).build());
    }

}

Answer 1

Here is the workaround as suggested Here

Basically create a MessageChannel with the dynamic destination using BinderAwareChannelResolver, then connect to RabbitMQ with RabbitAdmin API and bind the newly created exchange to another queue or exchange with routing key before sending messages.

@Autowired
private BinderAwareChannelResolver poChannelResolver;

public void publish(WebSocketVO webSocketVO) throws Exception {

    MessageChannel channel = this.poChannelResolver.resolveDestination(webSocketVO.getDestination());

    CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
    connectionFactory.setUsername(System.getProperty("spring.cloud.stream.binders.corerabbit.environment.spring.rabbitmq.username"));
    connectionFactory.setPassword(System.getProperty("spring.cloud.stream.binders.corerabbit.environment.spring.rabbitmq.password"));
    connectionFactory.setAddresses(System.getProperty("spring.cloud.stream.binders.corerabbit.environment.spring.rabbitmq.addresses"));
    connectionFactory.setVirtualHost(System.getProperty("spring.cloud.stream.binders.corerabbit.environment.spring.rabbitmq.virtual-host"));

    AmqpAdmin amqpAdmin = new RabbitAdmin(connectionFactory);

    TopicExchange sourceExchange = new TopicExchange(webSocketVO.getDestination(), false, true);
    TopicExchange destExchange = new TopicExchange("amq.topic");

    amqpAdmin.declareBinding(BindingBuilder.bind(destExchange).to(sourceExchange).with(webSocketVO.getRoutingKeyExpression()));




    channel.send(MessageBuilder.withPayload(new ObjectMapper().
            setVisibility(PropertyAccessor.FIELD, Visibility.ANY).
            writeValueAsString(webSocketVO)).build());


    amqpAdmin.deleteExchange(webSocketVO.getDestination());

    connectionFactory.destroy();

}