该版本仍在开发中，尚未被视为稳定。对于最新稳定版本，请使用 spring-cloud-stream 5.0.0！spring-doc.cadn.net.cn

重试与死信处理

默认情况下，当你配置重试（例如，最大尝试次数）enableDlq在消费者绑定中，这些功能在绑定器内完成，监听器容器或 Kafka 消费者不参与。spring-doc.cadn.net.cn

在某些情况下，将此功能迁移到监听器容器会更为理想，例如：spring-doc.cadn.net.cn

要配置将此功能从绑定器迁移到容器，定义一个@Bean类型ListenerContainerWithDlqAndRetryCustomizer. 该接口具有以下方法：spring-doc.cadn.net.cn

/**
 * Configure the container.
 * @param container the container.
 * @param destinationName the destination name.
 * @param group the group.
 * @param dlqDestinationResolver a destination resolver for the dead letter topic (if
 * enableDlq).
 * @param backOff the backOff using retry properties (if configured).
 * @see #retryAndDlqInBinding(String, String)
 */
void configure(AbstractMessageListenerContainer<?, ?> container, String destinationName, String group,
        @Nullable BiFunction<ConsumerRecord<?, ?>, Exception, TopicPartition> dlqDestinationResolver,
        @Nullable BackOff backOff);

/**
 * Return false to move retries and DLQ from the binding to a customized error handler
 * using the retry metadata and/or a {@code DeadLetterPublishingRecoverer} when
 * configured via
 * {@link #configure(AbstractMessageListenerContainer, String, String, BiFunction, BackOff)}.
 * @param destinationName the destination name.
 * @param group the group.
 * @return false to disable retries and DLQ in the binding
 */
default boolean retryAndDlqInBinding(String destinationName, String group) {
    return true;
}

目的解析器和退避如果配置了，则由绑定属性创建。这卡夫卡模板使用来自的配置Spring。卡夫卡......性能。你可以用这些工具创建自定义的错误处理程序和死符发布器;例如：spring-doc.cadn.net.cn

@Bean
ListenerContainerWithDlqAndRetryCustomizer cust(KafkaTemplate<?, ?> template) {
    return new ListenerContainerWithDlqAndRetryCustomizer() {

        @Override
        public void configure(AbstractMessageListenerContainer<?, ?> container, String destinationName,
                String group,
                @Nullable BiFunction<ConsumerRecord<?, ?>, Exception, TopicPartition> dlqDestinationResolver,
                @Nullable BackOff backOff) {

            if (destinationName.equals("topicWithLongTotalRetryConfig")) {
                ConsumerRecordRecoverer dlpr = new DeadLetterPublishingRecoverer(template,
                        dlqDestinationResolver);
                container.setCommonErrorHandler(new DefaultErrorHandler(dlpr, backOff));
            }
        }

        @Override
        public boolean retryAndDlqInBinding(String destinationName, String group) {
            return !destinationName.contains("topicWithLongTotalRetryConfig");
        }

    };
}

现在，只需一次重试延迟超过消费者的延迟max.poll.interval.ms财产。spring-doc.cadn.net.cn

在使用多个绑定器时，'ListenerContainerWithDlqAndRetryCustomizer' 豆子会被'DefaultBinderFactory'覆盖。为了豆子 要应用，你需要使用“BinderCustomizer”来设置容器自定义器（参见[binder-customizer]）：spring-doc.cadn.net.cn

@Bean
public BinderCustomizer binderCustomizer(ListenerContainerWithDlqAndRetryCustomizer containerCustomizer) {
    return (binder, binderName) -> {
        if (binder instanceof KafkaMessageChannelBinder kafkaMessageChannelBinder) {
            kafkaMessageChannelBinder.setContainerCustomizer(containerCustomizer);
        }
        else if (binder instanceof KStreamBinder) {
            ...
        }
        else if (binder instanceof RabbitMessageChannelBinder) {
            ...
        }
    };
}