Dynamically setting host for Spring AMQP and RabbitMQ on Spring Boot

Question

i have a problem, i do not know how to set the host dynamically and doing RPC operation on different host

Here is the situation

I have a multiple RabbitMQ running on different servers and networks (ie 192.168.1.0/24, 192.168.2.0/24).

The behavior would be i have a list of IP address which i will perform an RPC with. So, for each entry in the ip address list, i want to perform a convertSendAndReceive and process the reply and so on.

Tried some codes in documentation but it seems it does not work even the invalid address (addresses that don't have a valid RabbitMQ running, or is not event existing on the network, for example 1.1.1.1) gets received by a valid RabbitMQ (running on 192.168.1.1 for example)

Note: I can successfully perform RPC call on correct address, however, i can also successfully perform RPC call on invalid address which im not suppose to

Anyone has any idea about this?

Here is my source

TaskSchedulerConfiguration.java

@Configuration
@EnableScheduling
public class TaskSchedulerConfiguration {
    @Autowired
    private IpAddressRepo ipAddressRepo;

    @Autowired
    private RemoteProcedureService remote;

    @Scheduled(fixedDelayString  = "5000", initialDelay = 2000)
    public void scheduledTask() {
        ipAddressRepo.findAll().stream()
              .forEach(ipaddress -> {
                boolean status = false;
                try {
                    remote.setIpAddress(ipaddress);
                    remote.doSomeRPC();                 
                } catch (Exception e) {
                    logger.debug("Unable to Connect to licenser server: {}", license.getIpaddress());
                    logger.debug(e.getMessage(), e);
                } 
              });

    }

}

RemoteProcedureService.java

@Service
public class RemoteProcedureService {

    @Autowired
    private RabbitTemplate template;

    @Autowired
    private DirectExchange exchange;


    public boolean doSomeRPC() throws JsonProcessingException {

        //I passed this.factory.getHost() so that i will know if only the valid ip address will be received by the other side
        //at this point, other side receives invalid ipaddress which supposedly will not be receive by the oher side
        boolean response = (Boolean) template.convertSendAndReceive(exchange.getName(), "rpc", this.factory.getHost());
        return response;
    }

    public void setIpAddress(String host) {
        factory.setHost(host);
        factory.setCloseTimeout(prop.getRabbitMQCloseConnectTimeout());
        factory.setPort(prop.getRabbitMQPort());
        factory.setUsername(prop.getRabbitMQUsername());
        factory.setPassword(prop.getRabbitMQPassword());
        template.setConnectionFactory(factory);

    }

}

AmqpConfiguration.java

@Configuration
public class AmqpConfiguration {
    public static final String topicExchangeName = "testExchange";

    public static final String queueName = "rpc";

    @Autowired
    private LicenseVisualizationProperties prop;

//Commented this out since this will only be assigne once
//i need to achieve to set it dynamically in order to send to different hosts
//so put it in RemoteProcedureService.java, but it never worked
//    @Bean
//    public ConnectionFactory connectionFactory() {
//        CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
//        connectionFactory.setCloseTimeout(prop.getRabbitMQCloseConnectTimeout());
//        connectionFactory.setPort(prop.getRabbitMQPort());
//        connectionFactory.setUsername(prop.getRabbitMQUsername());
//        connectionFactory.setPassword(prop.getRabbitMQPassword());
//        return connectionFactory;
//    }

    @Bean
    public DirectExchange exhange() {
        return new DirectExchange(topicExchangeName);
    }

}

UPDATE 1

It seems that, during the loop, when an valid ip is set in the CachingConnectionFactory succeeding ip addressing loop, regardliess if valid or invalid, gets received by the first valid ip set in CachingConnectionFactory

UPDATE 2

I found out that once it can establish a successfully connection, it will not create a new connection. How do you force RabbitTemplate to establish a new connection?

Answer 1

It's a rather strange use case and won't perform very well; you would be better to have a pool of connection factories and templates.

However, to answer your question:

Call resetConnection() to close the connection.