通用Spring Kafka监听器

Question

我在一个Maven项目中让kafka生产者和消费者成为了一个。

我想在另一个Maven项目中使用它，因此我添加了上述kafka项目的依赖项。 现在的问题是生产者很好，但是如何使侦听器通用，而添加该项目的所有其他项目都可以覆盖它。

目前我在一个项目中有监听器

public class Listener {
    public CountDownLatch countDownLatch0 = new CountDownLatch(3);
    public CountDownLatch countDownLatch1 = new CountDownLatch(3);
    public CountDownLatch countDownLatch2 = new CountDownLatch(3);

    @KafkaListener(id = "id0", topicPartitions = { @TopicPartition(topic = "SpringKafkaTopic1", partitions = { "0" }) })
    public void listenPartition0(ConsumerRecord<?, ?> record) {
        System.out.println("Listener Id0, Thread ID: " + Thread.currentThread().getId());
        System.out.println("Received: " + record);
        countDownLatch0.countDown();
    }

    @KafkaListener(id = "id1", topicPartitions = { @TopicPartition(topic = "SpringKafkaTopic1", partitions = { "1" }) })
    public void listenPartition1(ConsumerRecord<?, ?> record) {
        System.out.println("Listener Id1, Thread ID: " + Thread.currentThread().getId());
        System.out.println("Received: " + record);
        countDownLatch1.countDown();
    }

    @KafkaListener(id = "id2", topicPartitions = { @TopicPartition(topic = "SpringKafkaTopic1", partitions = { "2" }) })
    public void listenPartition2(ConsumerRecord<?, ?> record) {
        System.out.println("Listener Id2, Thread ID: " + Thread.currentThread().getId());
        System.out.println("Received: " + record);
        countDownLatch2.countDown();
    }

我如何制作可以被所有其他项目覆盖的通用侦听器，其他所有项目都将该项目添加为依赖项并可以收听其各自的主题

Answer 1

如果我正确理解了您的问题，我认为您需要执行以下操作：

在共享的.jar中...

public abstract class Listener {
  public CountDownLatch countDownLatch0 = new CountDownLatch(3);
  public CountDownLatch countDownLatch1 = new CountDownLatch(3);
  public CountDownLatch countDownLatch2 = new CountDownLatch(3);


  abstract void handlePartition0(record);
  abstract void handlePartition1(record);
  abstract void handlePartition2(record);

  @KafkaListener(id = "id0", topicPartitions = { @TopicPartition(topic = "SpringKafkaTopic1", partitions = { "0" }) })
  public void listenPartition0(ConsumerRecord<?, ?> record) {
    handlePartition0(record);
    countDownLatch0.countDown();
  }

  @KafkaListener(id = "id1", topicPartitions = { @TopicPartition(topic = "SpringKafkaTopic1", partitions = { "1" }) })
  public void listenPartition1(ConsumerRecord<?, ?> record) {
    handlePartition1(record);
    countDownLatch1.countDown();
  }

  @KafkaListener(id = "id2", topicPartitions = { @TopicPartition(topic = "SpringKafkaTopic1", partitions = { "2" }) })
  public void listenPartition2(ConsumerRecord<?, ?> record) {
    handlePartition2(record);
    countDownLatch2.countDown();
  }
}

然后在子项目中，导入共享的.jar并导入handleXXX方法。

public class MyChildListener extends Listener {
  public void handlePartition0(Record<?,?> r) { 
    // do something useful
  }
  ...
}

这可能对您有用。