Kafka中的事件广播？

在Kafka中，使用发布-订阅模型进行事件广播。您可以从生产者发布事件并将它们发送到主题中，之后消费者可以从这个主题订阅并接收这些事件。以下是一些使用Kafka实现事件广播的示例代码：

// 生产者代码 import org.apache.kafka.clients.producer.Producer; import org.apache.kafka.clients.producer.ProducerConfig; import org.apache.kafka.clients.producer.ProducerRecord; import org.apache.kafka.common.serialization.StringSerializer; import java.util.Properties;

public class EventProducer { private final static String TOPIC_NAME = "event_topic";

public static void main(String[] args) { Properties props = new Properties(); props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092"); props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName()); props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());

  Producer<String, String> producer = new KafkaProducer<>(props);

  String message = "Hello, world!";
  ProducerRecord<String, String> record = new ProducerRecord<>(TOPIC_NAME, message);
  producer.send(record);

  producer.close();

} }

// 消费者代码 import org.apache.kafka.clients.consumer.Consumer; import org.apache.kafka.clients.consumer.ConsumerConfig; import org.apache.kafka.clients.consumer.ConsumerRecords; import org.apache.kafka.clients.consumer.KafkaConsumer; import org.apache.kafka.common.serialization.StringDeserializer; import java.time.Duration; import java.util.Collections; import java.util.Properties;

public class EventConsumer { private final static String TOPIC_NAME = "event_topic";

public static void main(String[] args) { Properties props = new Properties(); props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092"); props.put(ConsumerConfig.GROUP_ID_CONFIG, "event_group"); props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName()); props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());

  Consumer<String, String> consumer = new KafkaConsumer<>(props);
  consumer.subscribe(Collections.singletonList(TOPIC_NAME));

  while (true) {
     ConsumerRecords