java - 如何在生产者之前启动kafka消费者

问题描述

我有一组与 kafka 主题交互的微服务。其中一个微服务应该使用两个整数，然后将它们相加并发送到主题。问题是我无法配置微服务，以便在生产者之前启动消费者。我的代码如下：

@SpringBootApplication
public class AdderApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(AdderApplication.class, args);
        AdderConsumer consumer = context.getBean(AdderConsumer.class);
        AdderProducer producer = context.getBean(AdderProducer.class);

        producer.sumTwoIntegers();
    }

@Component
public class AdderConsumer extends Controller {

    private CountDownLatch latch = new CountDownLatch(3);

    @KafkaListener(topics = "${kafka.topic.name}")
    public void listenToPartitionWithOffset(@Payload Integer message) {
        if (message != null) {
            list.add(message);
            isProduce = true;
            System.out.println(list);
        }   
    }

@Component
public class AdderProducer extends Controller {

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    @Value("${kafka.topic.name}")
    private String topicName;


    public void sumTwoIntegers() {
       // logic
    }

    private void sendMessage(String message) {
        // logic
    }

@Configuration
@EnableKafka
public class KafkaConfig {

    @Value("${kafka.boot.server}")
    private String kafkaServer;

    @Value("${kafka.consumer.group.id}")
    private String kafkaGroupId;

    @Bean
    public LoggingErrorHandler errorHandler(){
        return new LoggingErrorHandler();
    }

    @Bean
    public KafkaTemplate<String, String> kafkaTemplate() {
        return new KafkaTemplate<>(producerConfig());
    }

    @Bean
    public ProducerFactory<String, String> producerConfig() {
        Map<String, Object> config = new HashMap<>();
        config.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaServer);
        config.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        config.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);

        return new DefaultKafkaProducerFactory<>(config);
    }

    @Bean
    public ConsumerFactory<String, Integer> consumerConfig() {
        Map<String, Object> config = new HashMap<>();
        config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaServer);
        config.put(ConsumerConfig.GROUP_ID_CONFIG, kafkaGroupId);
        config.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        config.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, IntegerDeserializer.class);

        return new DefaultKafkaConsumerFactory<>(config);
    }

    @Bean
    public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, Integer>> kafkaListenerContainerFactory() {
        ConcurrentKafkaListenerContainerFactory<String, Integer> listener = new ConcurrentKafkaListenerContainerFactory<>();
        listener.setConsumerFactory(consumerConfig());
        listener.setErrorHandler(errorHandler());
        return listener;
    }

我调试了代码，它同时调用了生产者和侦听器，但是我需要侦听器首先接收两个整数，然后才调用生产者方法。

我会欣赏你的想法。

标签： javaspring-bootapache-kafka

java - 如何在生产者之前启动kafka消费者

问题描述

解决方案

推荐阅读