Question

我正在使用来自GitHub（https://github.com/marinkobabic/axon-kafka-example）的Kafka示例，并且在连接到本地部署的Kafka集群时可以正常工作。正如Axon的docs所建议的那样，我试图通过暴露 KafkaPublisher bean并覆盖 withProducerFactory （），来使用自定义的kafka ProducerFactory ）。我的bean已创建，但是我的自定义kafka ProducerFactory 的 createProducer （）从未被调用。实际上，仍使用Axon的 DefaultProducerFactory 。有什么建议吗？

@Bean
KafkaPublisher<byte[], byte[]> kafkaPublisher(ProducerFactory factory) {
    KafkaPublisherConfiguration configuration = KafkaPublisherConfiguration.<String, byte[]>builder()
        .withMessageSource(new SimpleEventBus())
        .withProducerFactory(new org.axonframework.kafka.eventhandling.producer.ProducerFactory<String, byte[]>() {
            @Override
            public Producer<String, byte[]> createProducer() {
                return factory.createProducer();
            }

            @Override
            public void shutDown() {
            }
        })
        .withTopic(topic)
        .build();
    KafkaPublisher<byte[], byte[]> publisher = new KafkaPublisher<>(configuration);
    publisher.start();
    return publisher;
}

Answer 1

我可以通过保留 KafkaPublisher 来解决问题，但是我需要公开一个 EventBus bean（我在 Sender.java ），然后将发布者连接到该发布者。我还需要公开包装自己的kafka ProducerFactory 的轴突 ProducerFactory 。我的最终配置如下：

@Configuration
@AutoConfigureBefore(KafkaAutoConfiguration.class)
class AxonConfig {

    @Value("${axon.kafka.default-topic}")
    private String topic;

    @Bean
    public org.axonframework.kafka.eventhandling.producer.ProducerFactory<byte[], byte[]> producerFactory(ProducerFactory factory) {
        return new org.axonframework.kafka.eventhandling.producer.ProducerFactory<byte[], byte[]>() {
            @Override
            public Producer<byte[], byte[]> createProducer() {
                return factory.createProducer();
            }

            @Override
            public void shutDown() {
            }
        };
    }

    @Bean("event-bus")
    EventBus eventBus() {
        return new SimpleEventBus();
    }

    @Bean
    KafkaPublisher<byte[], byte[]> kafkaPublisher(org.axonframework.kafka.eventhandling.producer.ProducerFactory factory, EventBus eventBus) {
        KafkaPublisherConfiguration configuration = KafkaPublisherConfiguration.<String, byte[]>builder()
            .withMessageSource(eventBus)
            .withProducerFactory(factory)
            .withTopic(topic)
            .build();
        PhotonKafkaPublisher<byte[], byte[]> publisher = new PhotonKafkaPublisher<>(configuration);
        eventBus.subscribe((events) -> publisher.sendEvents(events));
        publisher.start();
        return publisher;
    }
}

Axon Kafka集成-使用自定义的Kafka ProducerFactory

1 个答案: