To remove unused channels in RabbitMQ using Spring AMQP

Question

I am using Spring Boot. I am trying to remove channels which are not in use using Spring AMQP (RabbitMQ) by Spring Boot. But not getting how to achieve it. Any help is appreciable.

ConnectionFactory Declaration:

public ConnectionFactory connectionFactory() {
        final CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
        connectionFactory.setUsername(userName);
        connectionFactory.setPassword(password);
        connectionFactory.setVirtualHost(centralHost);
        connectionFactory.setHost(rabbitMqHost);
        connectionFactory.setConnectionTimeout(connectionTimeout);
        connectionFactory.setChannelCacheSize(4);
        connectionFactory.setExecutor(Executors.newFixedThreadPool(rabbitmqThreads));
        
        return connectionFactory;
    }

ContainerFactory Declaration:

public DirectRabbitListenerContainerFactory rabbitDirectListenerContainerFactory(ConnectionFactory connectionFactory) {
        DirectRabbitListenerContainerFactory factory = new DirectRabbitListenerContainerFactory();
        factory.setConnectionFactory(connectionFactory);
        factory.setAcknowledgeMode(AcknowledgeMode.NONE);
        factory.setAfterReceivePostProcessors( m -> {
            m.getMessageProperties().setContentType("text/plain");
            return m;
        });
        return factory;
    }

Answer 1

Why do you want to close it? That's the whole point of caching the channel(s); so we don't have to create a new one each time we publish a message.

The minimum cache size is 1.

You can call resetConnection() on the CachingConnectionFactory to close the connection and all cached channels.