RabbitMQ 3.5 and Message Priority Queue process is waiting until the task completion - rabbitmq

Question

I have some priority based tasks in my application. I have two queues "queue1" and "queue2", i want to gave highest priority to queue1 and lowest priority to queue2. I setup queue1 priority number is 255 and queue2 priority number is 200. I am having an issue in executing the tasks , once priority task is taken , The process is waiting until the task completion synchronously. But as per our project need, this process shouldn't be waiting but just kick off it. How do I achieve it?
I refereed this blog,
Message Received part:
final CountDownLatch latch = new CountDownLatch(3);
ch.basicConsume(QUEUE, true, new DefaultConsumer(ch) {
#Override
public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body) throws IOException {
System.out.println("Received " + new String(body));
latch.countDown();
}
});
latch.await();
I already done this process without priority queue in RabbitMQ https://pamlesleylu.wordpress.com/2013/02/02/hello-world-for-spring-amqp-and-rabbitmq/
Producer
public void execute() {
System.out.println("execute...");
messageQueue.convertAndSend("hello " + counter.incrementAndGet());
}
Consumer
public void onMessage(Message msg) {
System.out.println(new String(msg.getBody()));
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

Answer 1

You need to hand the task off to another thread (e.g. using a TaskExecutor).
Bear in mind, though, that the message will be acked so if the server crashes you will lose that message.
It would probably be better to increase the concurrency in the listener container so you can handle multiple messages at once.