Java Code Examples for org.springframework.amqp.core.Queue#getName()

/**
 * If so requested, declare the DLX/DLQ and bind it. The DLQ is bound to the DLX with
 * a routing key of the original queue name because we use default exchange routing by
 * queue name for the original message.
 * @param baseQueueName The base name for the queue (including the binder prefix, if
 * any).
 * @param routingKey The routing key for the queue.
 * @param properties the properties.
 */
private void autoBindDLQ(final String baseQueueName, String routingKey,
		RabbitCommonProperties properties) {
	boolean autoBindDlq = properties.isAutoBindDlq();
	if (this.logger.isDebugEnabled()) {
		this.logger.debug("autoBindDLQ=" + autoBindDlq + " for: " + baseQueueName);
	}
	if (autoBindDlq) {
		String dlqName;
		if (properties.getDeadLetterQueueName() == null) {
			dlqName = constructDLQName(baseQueueName);
		}
		else {
			dlqName = properties.getDeadLetterQueueName();
		}
		Queue dlq = new Queue(dlqName, true, false, false,
				queueArgs(dlqName, properties, true));
		declareQueue(dlqName, dlq);
		String dlxName = deadLetterExchangeName(properties);
		if (properties.isDeclareDlx()) {
			declareExchange(dlxName,
					new ExchangeBuilder(dlxName,
							properties.getDeadLetterExchangeType()).durable(true)
									.build());
		}
		Map<String, Object> arguments = new HashMap<>(properties.getDlqBindingArguments());
		Binding dlqBinding = new Binding(dlq.getName(), DestinationType.QUEUE,
				dlxName, properties.getDeadLetterRoutingKey() == null ? routingKey
						: properties.getDeadLetterRoutingKey(),
				arguments);
		declareBinding(dlqName, dlqBinding);
		if (properties instanceof RabbitConsumerProperties
				&& ((RabbitConsumerProperties) properties).isRepublishToDlq()) {
			/*
			 * Also bind with the base queue name when republishToDlq is used, which
			 * does not know about partitioning
			 */
			declareBinding(dlqName, new Binding(dlq.getName(), DestinationType.QUEUE,
					dlxName, baseQueueName, arguments));
		}
	}
}
 

@GetMapping(value = "/topic/{name}", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
public Flux<?> receiveMessagesFromTopic(@PathVariable String name) {

    DestinationsConfig.DestinationInfo d = destinationsConfig.getTopics()
        .get(name);

    if (d == null) {
        return Flux.just(ResponseEntity.notFound()
            .build());
    }

    Queue topicQueue = createTopicQueue(d);
    String qname = topicQueue.getName();

    MessageListenerContainer mlc = messageListenerContainerFactory.createMessageListenerContainer(qname);

    Flux<String> f = Flux.<String> create(emitter -> {

        log.info("[I168] Adding listener, queue={}", qname);

        mlc.setupMessageListener((MessageListener) m -> {

            log.info("[I137] Message received, queue={}", qname);

            if (emitter.isCancelled()) {
                log.info("[I166] cancelled, queue={}", qname);
                mlc.stop();
                return;
            }

            String payload = new String(m.getBody());
            emitter.next(payload);

            log.info("[I176] Message sent to client, queue={}", qname);

        });

        emitter.onRequest(v -> {
            log.info("[I171] Starting container, queue={}", qname);
            mlc.start();
        });

        emitter.onDispose(() -> {
            log.info("[I176] onDispose: queue={}", qname);
            amqpAdmin.deleteQueue(qname);
            mlc.stop();
        });            

        log.info("[I171] Container started, queue={}", qname);

      });
    
    return Flux.interval(Duration.ofSeconds(5))
      .map(v -> {
            log.info("[I209] sending keepalive message...");
            return "No news is good news";
      })
      .mergeWith(f);

}