springboot--RabbitMQ中的消息確認

RabbitMQ的兩種消息確認，publisherConfirms 和 publisherReturns。

• publisherConfirms：消息發送到exchange，返回成功或者失敗。
• publishReturns：消息從exchange到queue，發送成功或者失敗。
  具體操作看下方代碼

1. 消費者與生產者兩方都要配置CachingConnectionFactory，其中將publisherConfirms，publishReturns開啓，默認都是false

	@Bean
    @ConditionalOnClass
    public CachingConnectionFactory connectionFactory() {
        CachingConnectionFactory factory = new CachingConnectionFactory();
        factory.setHost("127.0.0.1");
        factory.setUsername("guest");
        factory.setPassword("guest");
        factory.setVirtualHost("/");
        factory.setPublisherConfirms(true);
        factory.setPublisherReturns(true);
        return factory;
    }

2. 消息Procuder端：設置RabbitTemplate相關屬性

	@Bean
    @ConditionalOnClass
    public RabbitTemplate template(CachingConnectionFactory connectionFactory) {
        RabbitTemplate template = new RabbitTemplate(connectionFactory);
        template.setConfirmCallback((correlationData, ack, cause) -> {
            LOGGER.info("confirm callback publish --> status of publihs message: {}", ack);
            LOGGER.info("confirm callback publish --> correlationData: {}", correlationData);
            LOGGER.info("confirm callback publish --> cause: {}", cause);
        });
        // 如果設置ReturnCallback，必須將Mandatory設置爲true
        template.setMandatory(true);
        template.setReturnCallback((message, replyCode, replyText,
                                    exchange, routingKey) -> {
            LOGGER.info("return callbak exchange: {}, routingKey: {}, message:{}", exchange, routingKey, new String(message.getBody(), StandardCharsets.UTF_8));
        });
        return template;
    }

相關代碼就是如此簡單，驗證時可以幹掉exchange，這樣就可以驗證confirm。將queue與exchange解綁，可以驗證returnCallback