Spring rabbitmq task queue concurrency - spring-boot

Question

I have a task queue which is using a proxy to make http requests. The proxy is limited to 10 concurrent threads / connections. I don't have access to the logs of the proxy.
I am using the following code, and this is making requests on two threads named ntContainer#1-1 and container1. This is resulting in many requests that error due to using too many connections to the proxy.
Is the listener only using 1 default thread and the extra container thread or is there more going on behind the scenes with spring/rabbitmq?
Also how can I debug this further?
#Configuration
public class RabbitMQConfig {
public final static String EXCHANGE_NAME = "my-tx";
public final static String MY_PRODUCT_ROUTING_KEY = "my-product-routing-key";
public final static String MY_PRODUCT_QUEUE = "my-product";
#Bean
public TopicExchange topicExchange() {
return new TopicExchange(EXCHANGE_NAME);
}
#Bean
public Queue myProductQueue() {
return new Queue(MY_PRODUCT_QUEUE);
}
#Bean
Binding myProductBinding() {
return BindingBuilder.bind(myProductQueue()).to(topicExchange()).with(MY_PRODUCT_ROUTING_KEY);
}
#Bean
SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, MessageListenerAdapter messageListenerAdapter) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.setQueueNames(MY_PRODUCT_QUEUE);
container.setMessageListener(messageListenerAdapter);
container.setPrefetchCount(1);
container.setConcurrentConsumers(1);
return container;
}
#Bean
MessageListenerAdapter messageListenerAdapter(MyListener myListener) {
return new MessageListenerAdapter(myListener, "process");
}
}
// listener
#RabbitListener(queues = RabbitMQConfig.MY_PRODUCT_QUEUE)
public void process(final Message message) {
// something like this
Jsoup.connect(message.getUrl()).proxy().execute()
}

Answer 1

Oops; I was looking at the question on my 'phone; I skipped past the container bean; I thought the container bean was a container factory not a container.
You have 2 listener containers -
#RabbitListener(queues = RabbitMQConfig.MY_PRODUCT_QUEUE)
public void process(final Message message) {
// something like this
Jsoup.connect(message.getUrl()).proxy().execute()
}
The framework will automatically create a container for that listener (it detects the annotation) and you have explicitly declared another container #Bean.
The proxy is limited to 10 concurrent threads / connections.
Even with 2 containers, you'll only get 2 threads, not 10.