<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.3.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <groupId>com.demo</groupId>
  <artifactId>rabbitmq-demo</artifactId>
  <version>1.0.0</version>

  <properties>
    <lombok.version>1.18.12</lombok.version>
  </properties>

  <dependencies>
    <!--web 模塊-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

		<!-- AMQP -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-amqp</artifactId>
    </dependency>

    <!-- lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
      <scope>provided</scope>
      <version>${lombok.version}</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

server:
 port: 20002
spring:
 rabbitmq:
 	# 這里我改了本地的hosts，實(shí)際地址是192.168.0.121
  host: vm.com
  port: 5672
  virtual-host: /
  username: admin
  password: admin
  # 開啟消息確認(rèn)模式
  # 消息發(fā)送到交換機(jī)確認(rèn)機(jī)制，是否確認(rèn)回調(diào)
  # publisher-confirms: true
  # 是否返回回調(diào)
  publisher-returns: true
  template:
   #開啟mandatory: true, basic.return方法將消息返還給生產(chǎn)者
   mandatory: true
  listener:
   simple:
   	# 手動(dòng)應(yīng)答
    acknowledge-mode: manual
    # 最少消費(fèi)者數(shù)量
    concurrency: 1 
    # 最多消費(fèi)者數(shù)量
    max-concurrency: 10
    # 支持重試
    retry:
     enabled: true 

@SpringBootApplication
@EnableRabbit
public class RabbitmqDemoApplication {
  
  public static void main(String[] args) {
    SpringApplication.run(RabbitmqDemoApplication.class, args);
  }
}

@Configuration
@Slf4j
public class RabbitConfig {

  private RabbitTemplate rabbitTemplate;

  @Bean
  public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
    rabbitTemplate = new RabbitTemplate(connectionFactory);
    return rabbitTemplate;
  }

}

@Component
public class Producer {
  
  // @Qualifier("rabbitTemplate")
  @Autowired
  private RabbitTemplate rabbitTemplate;

  public void send() {
    for (int i = 0; i < 5; i++) {
      System.out.println("生產(chǎn)者發(fā)送消息，序號(hào)為: " + i);
      rabbitTemplate.convertAndSend("test", String.valueOf(i));
    }
  }
}

@Component
@Slf4j
public class Consumer {

  /**
   * 消費(fèi)者1 模擬正常處理消息的情況，消息處理完畢發(fā)送確認(rèn)應(yīng)答
   * @param message
   * @param channel
   * @throws IOException
   */
  @RabbitListener(queues = "test")
  public void process1(Message message, Channel channel) throws IOException {
    log.info("消費(fèi)者1 接收消息: " + new String(message.getBody()));
    log.info("消費(fèi)者1 確認(rèn)應(yīng)答消息：" + new String(message.getBody()));
    channel.basicAck(message.getMessageProperties().getDeliveryTag(), true);
  }

  /**
   * 消費(fèi)者2 模擬處理消息出錯(cuò)的情況，消費(fèi)者2向rabbitmq發(fā)送拒絕應(yīng)答。
   * 處理失敗的消息會(huì)被重新放入ready中，再次發(fā)送給消費(fèi)者，直至收到確認(rèn)應(yīng)答
   * @param message
   * @param channel
   * @throws IOException
   */
  @RabbitListener(queues = "test")
  public void process2(Message message, Channel channel) throws IOException {
    log.info("消費(fèi)者2 接收消息：" + new String(message.getBody()));
    log.info("消費(fèi)者2 拒絕應(yīng)答消息：" + new String(message.getBody()));
    channel.basicReject(message.getMessageProperties().getDeliveryTag(), true);
  }
}

@RestController
@RequestMapping("")
public class RabbitMqController {

  @Autowired
  private Producer producer;

  @GetMapping("/send")
  public String send() {
    producer.send();
    return "發(fā)送完成";
  }
}