在 Spring Boot 你如何配置一些监听器使用自动确认和其他使用手动确认

Question

I have a simple Spring Boot app with multiple methods annotated with @KafkaListener. I would like some of them to use automatic acknowledgment while others use manual acknowledgment. Is it possible to achieve this using Spring Boot configuration with out manually setting up container factories? According to the documentation Using a @KafkaListener requires code like

@KafkaListener(id = "cat", topics = "myTopic",
          containerFactory = "kafkaManualAckListenerContainerFactory")
public void listen(String data, Acknowledgment ack) {
    ...
    ack.acknowledge();
}

Does this mean I need to create two container factory's, one for automatic acknowledgement and one for manual acknowledgement and configure all listeners to reference the correct factory?

Answer 1

Does this mean I need to create two container factory's, one for automatic acknowledgement and one for manual acknowledgement and configure all listeners to reference the correct factory?

The assumption is correct. You just provide one ListenerContainerFactory bean with one set of ContainerProperties and another one with different set. See this JavaDocs for more info in the AbstractKafkaListenerContainerFactory :

/**
 * Obtain the properties template for this factory - set properties as needed
 * and they will be copied to a final properties instance for the endpoint.
 * @return the properties.
 */
public ContainerProperties getContainerProperties()

You may consider to rely on the conventional bean name for that containerFactory property for one of the ack mode and set of listeners:

/**
 * The bean name of the {@link org.springframework.kafka.config.KafkaListenerContainerFactory}
 * to use to create the message listener container responsible to serve this endpoint.
 * <p>
 * If not specified, the default container factory is used, if any. If a SpEL
 * expression is provided ({@code #{...}}), the expression can either evaluate to a
 * container factory instance or a bean name.
 * @return the container factory bean name.
 */
String containerFactory() default "";

Where default one is KafkaListenerAnnotationBeanPostProcessor.DEFAULT_KAFKA_LISTENER_CONTAINER_FACTORY_BEAN_NAME - kafkaListenerContainerFactory .