Spring Cloud Stream MessageChannel send() 总是返回true

Question

我正在使用 Spring 云流，我想保存消息并在 Kafka 服务器消失时重试在主题上发布它们，但即使 Kafka/Zookeeper 服务器停止，MessageChannel send() 方法也总是返回 true .

有人可以帮忙吗？

更新 application.yml 内容：

spring:
    cloud:
        stream:
            kafka:
                binder:
                    brokers: localhost
                    zk-nodes: localhost
                    mode: raw
                bindings:
                    output:
                        producer:
                            sync: true
            bindings:
                output:
                    destination: topic-notification
                    content-type: application/json

代码：

@Service
public class SendToKafka {
    private Logger log = LoggerFactory.getLogger(SendToKafka.class);

    @Autowired
    Source source;

    @Autowired
    NotificationFileService notificationFileService;

    public void send(NotificationToResendDTO notification){
        try {
            CompletableFuture.supplyAsync(() -> notification)
                .thenAcceptAsync(notif -> {
                    boolean resp = source.output().send(MessageBuilder.withPayload(notif).build());
                    log.info(" ======== kafka server response === " + resp);

                    if (!resp){
                        log.info(" ======== failed to send the notification" + notification);
                        // save failed notification
                        notificationFileService.writeTofile(notification);
                    }
                }).get();
        } catch (InterruptedException | ExecutionException e) {
            log.info(" ======== failed to send the notification with exception" + notification);
            // save failed notification
            notificationFileService.writeTofile(notification);
            e.printStackTrace();
        }
    }
}

Answer 1

Kafka 默认是异步的；您需要将sync 设置为true；见binder producer properties。

同步

生产者是否同步。

默认值：假。