【深入理解RabbitMQ原理】Spring AMQP 声明队列和交换机的顺序问题

 

 

                                           AMQP 声明队列和交换机的顺序问题

 

消息发送方和接收方都可以去声明交换机或者队列， 但是这个顺序是咋样的？

一直认为只要启动了Sprig 容器，那么就自动声明了交换机和队列，其实不是这样的。

生产者是在发送的时候，消费者是在容器启动的时候初始化的

CorrelationData correlationData = new CorrelationData(UUID.randomUUID().toString());
        this.rabbitTemplate.convertAndSend(this.routingKey, message, correlationData);

RabbitAdmin类

public void initialize() {

		if (this.applicationContext == null) {
			if (this.logger.isDebugEnabled()) {
				this.logger
						.debug("no ApplicationContext has been set, cannot auto-declare Exchanges, Queues, and Bindings");
			}
			return;
		}

		logger.debug("Initializing declarations");
		final Collection exchanges = filterDeclarables(applicationContext.getBeansOfType(Exchange.class).values());
		final Collection queues = filterDeclarables(applicationContext.getBeansOfType(Queue.class).values());
		final Collection bindings = filterDeclarables(applicationContext.getBeansOfType(Binding.class).values());

		for (Exchange exchange : exchanges) {
			if (!exchange.isDurable()) {
				logger.warn("Auto-declaring a non-durable Exchange ("
						+ exchange.getName()
						+ "). It will be deleted by the broker if it shuts down, and can be redeclared by closing and reopening the connection.");
			}
			if (exchange.isAutoDelete()) {
				logger.warn("Auto-declaring an auto-delete Exchange ("
						+ exchange.getName()
						+ "). It will be deleted by the broker if not in use (if all bindings are deleted), but will only be redeclared if the connection is closed and reopened.");
			}
		}

		for (Queue queue : queues) {
			if (!queue.isDurable()) {
				logger.warn("Auto-declaring a non-durable Queue ("
						+ queue.getName()
						+ "). It will be redeclared if the broker stops and is restarted while the connection factory is alive, but all messages will be lost.");
			}
			if (queue.isAutoDelete()) {
				logger.warn("Auto-declaring an auto-delete Queue ("
						+ queue.getName()
						+ "). It will be deleted by the broker if not in use, and all messages will be lost.  Redeclared when the connection is closed and reopened.");
			}
			if (queue.isExclusive()) {
				logger.warn("Auto-declaring an exclusive Queue ("
						+ queue.getName()
						+ "). It cannot be accessed by consumers on another connection, and will be redeclared if the connection is reopened.");
			}
		}

		rabbitTemplate.execute(new ChannelCallback