/**
-
交换机与routekey绑定
-
@return
*/
@Bean
public Binding yewu1DemoBinding() {
return BindingBuilder.bind(yewu1DemoQueue()).to(yewu1Exchange())
.with(YEWU1_DEMO_ROUTINGKEY);
}
}
2.延时队列
声明延时队列与绑定关系。
@Configuration
public class RetryConfig {
/**
- 延时队列 交换机配置标识符(固定)
*/
public static final String RETRY_LETTER_QUEUE_KEY = "x-dead-letter-exchange";
/**
- 延时队列交换机绑定配置键标识符(固定)
*/
public static final String RETRY_LETTER_ROUTING_KEY = "x-dead-letter-routing-key";
/**
- 延时队列消息的配置超时时间枚举(固定)
*/
public static final String RETRY_MESSAGE_TTL = "x-message-ttl";
/**
- yewu1模块延时队列交换机
*/
public final static String YEWU1_RETRY_EXCHANGE_NAME = "yewu1_retry_exchange";
/**
- yewu1模块DEMO业务延时队列
*/
public final static String YEWU1_DEMO_RETRY_QUEUE_NAME = "yewu1_demo_retry_queue";
/**
- yewu1模块DEMO延时队列routekey
*/
public final static String YEWU1_DEMO_RETRY_ROUTING_KEY = "yewu1_demo_retry_key";
/**
-
延时队列交换机
-
@return
*/
@Bean
public DirectExchange yewu1RetryExchange() {
DirectExchange directExchange = new DirectExchange(YEWU1_RETRY_EXCHANGE_NAME, true, false);
return directExchange;
}
/**
-
新建延时队列 一个业务队列需要一个延时队列
-
@return
*/
@Bean
public Queue yewu1DemoRetryQueue() {
Map<String, Object> args = new ConcurrentHashMap<>(3);
// 将消息重新投递到业务交换机Exchange中
args.put(RETRY_LETTER_QUEUE_KEY, BusinessConfig.YEWU1_EXCHANGE);
args.put(RETRY_LETTER_ROUTING_KEY, BusinessConfig.YEWU1_DEMO_ROUTINGKEY);
// 消息在队列中延迟3s后超时，消息会重新投递到x-dead-letter-exchage对应的队列中，routingkey为自己指定
args.put(RETRY_MESSAGE_TTL, 3 * 1000);
return new Queue(YEWU1_DEMO_RETRY_QUEUE_NAME, true, false, false, args);
}
/**
-
绑定以上定义关系
-
@return
*/
@Bean
public Binding retryDirectBinding() {
return BindingBuilder.bind(yewu1DemoRetryQueue()).to(yewu1RetryExchange())
.with(YEWU1_DEMO_RETRY_ROUTING_KEY);
}
}
3.死信队列
声明私信队列与绑定关系。
@Configuration
public class DeadConfig {
/**
- 死信队列
*/
public final static String FAIL_QUEUE_NAME = "fail_queue";
/**
- 死信交换机
*/
public final static String FAIL_EXCHANGE_NAME = "fail_exchange";
/**
- 死信routing
*/
public final static String FAIL_ROUTING_KEY = "fail_routing";
/**
-
创建配置死信队列
*/
@Bean
public Queue deadQueue() {
return new Queue(FAIL_QUEUE_NAME, true, false, false);
}
/**
-
死信交换机
-
@return
*/
@Bean
public DirectExchange deadExchange() {
DirectExchange directExchange = new DirectExchange(FAIL_EXCHANGE_NAME, true, false);
return directExchange;
}
/**
-
绑定关系
-
@return
*/
@Bean
public Binding failBinding() {
return BindingBuilder.bind(deadQueue()).to(deadExchange()).with(FAIL_ROUTING_KEY);
}
}
4.生产者
生产者如上文，通用代码。
@RestController
@RequestMapping("/TestRabbit")
public class ProducerDemo {
@Resource
private RabbitTemplate rabbitTemplate;
//@RequestMapping("/sendDirect")
String sendDirect(@RequestBody String message) throws Exception {
System.out.println("开始生产");
CorrelationData data = new CorrelationData(UUID.randomUUID().toString());
rabbitTemplate.convertAndSend(BusinessConfig.YEWU1_EXCHANGE, BusinessConfig.YEWU1_DEMO_ROUTINGKEY,
message, data);
System.out.println("结束生产");
System.out.println("发送id:" + data);
return "OK,sendDirect:" + message;
}
}
5.消费者
大量的逻辑，请参考注释。
public enum RabbitEnum {
/**
- 处理成功
*/
ACCEPT,
/**
- 可以重试的错误
*/
RETRY,
/**
- 无需重试的错误
*/
REJECT
@Component
public class ConsumerDemo {
private final static Logger logger = LoggerFactory.getLogger(ConsumerDemo.class);
@Resource
private RabbitTemplate rabbitTemplate;
// @RabbitListener(queues = "yewu1_demo_queue")
protected void consumer(Message message, Channel channel) throws Exception {
RabbitEnum ackSign = RabbitEnum.RETRY;
System.out.println(message.getMessageProperties().getCorrelationId());
try {
// 可以加入重复消费判断
int i = 1 / 0;
} catch (Exception e) {
ackSign = RabbitEnum.RETRY;
throw e;
} finally {
// 通过finally块来保证Ack/Nack会且只会执行一次
if (ackSign == RabbitEnum.ACCEPT) {
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
} else if (ackSign == RabbitEnum.RETRY) {
String correlationData =
(String)message.getMessageProperties().getHeaders().get("spring_returned_message_correlation");
System.out.println(message.getMessageProperties().getCorrelationId());
long retryCount = getRetryCount(message.getMessageProperties());
if (retryCount >= 3) {
// 重试次数超过3次,则将消息发送到失败队列等待特定消费者处理或者人工处理
try {
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
rabbitTemplate.convertAndSend(DeadConfig.FAIL_EXCHANGE_NAME, DeadConfig.FAIL_ROUTING_KEY,
message, new CorrelationData(correlationData));
logger.info("连续失败三次，将消息发送到死信队列,发送消息:" + new String(message.getBody()));
} catch (Exception e1) {
channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, false);
logger.error("发送死信队列报错:" + e1.getMessage() + ",原始消息:" + new String(message.getBody()));
}
} else {
try {
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
// 重试次数不超过3次,则将消息发送到重试队列等待重新被消费
rabbitTemplate.convertAndSend(RetryConfig.YEWU1_RETRY_EXCHANGE_NAME,
RetryConfig.YEWU1_DEMO_RETRY_ROUTING_KEY, message,
new CorrelationData(correlationData));
logger.info("消费失败，消息发送到重试队列;" + "原始消息：" + new String(message.getBody()) + ";第"
- (retryCount + 1) + "次重试");
} catch (Exception e1) {
channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, false);
logger.error("消息发送到重试队列的时候，异常了:" + e1.getMessage() + ",重新发送消息");
}
}
}
}
}
/**
- 获取消息被重试的次数
*/
public long getRetryCount(MessageProperties messageProperties) {
Long retryCount = 0L;
if (null != messageProperties) {
List<Map<String, ?>> deaths = messageProperties.getXDeathHeader();
if (deaths != null && deaths.size() > 0) {
Map<String, Object> death = (Map<String, Object>)deaths.get(0);
retryCount = (Long)death.get("count");
}
}
return retryCount;
}
}
