这种在 Spring Boot 应用程序中启动无限循环的方式有什么问题吗? [英] Are there any problems with this way of starting an infinite loop in a Spring Boot application?

问题描述

我有一个 Spring Boot 应用程序，它需要处理一些 Kafka 流数据.我向将在启动时运行的 CommandLineRunner 类添加了一个无限循环.其中有一个可以被唤醒的 Kafka 消费者.我用 Runtime.getRuntime().addShutdownHook(new Thread(consumer::wakeup)); 添加了一个关闭钩子.我会遇到任何问题吗?在 Spring 中是否有更惯用的方式来做到这一点?我应该改用 @Scheduled 吗?下面的代码去除了特定的 Kafka 实现内容，但其他方面是完整的.

I have a Spring Boot application and it needs to process some Kafka streaming data. I added an infinite loop to a CommandLineRunner class that will run on startup. In there is a Kafka consumer that can be woken up. I added a shutdown hook with Runtime.getRuntime().addShutdownHook(new Thread(consumer::wakeup));. Will I run into any problems? Is there a more idiomatic way of doing this in Spring? Should I use @Scheduled instead? The code below is stripped of specific Kafka-implementation stuff but otherwise complete.

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.errors.WakeupException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

import java.time.Duration;
import java.util.Properties;


    @Component
    public class InfiniteLoopStarter implements CommandLineRunner {

        private final Logger logger = LoggerFactory.getLogger(this.getClass());

        @Override
        public void run(String... args) {
            Consumer<AccountKey, Account> consumer = new KafkaConsumer<>(new Properties());
            Runtime.getRuntime().addShutdownHook(new Thread(consumer::wakeup));

            try {
                while (true) {
                    ConsumerRecords<AccountKey, Account> records = consumer.poll(Duration.ofSeconds(10L));
                    //process records
                }
            } catch (WakeupException e) {
                logger.info("Consumer woken up for exiting.");
            } finally {
                consumer.close();
                logger.info("Closed consumer, exiting.");
            }
        }
    }

推荐答案

我不确定您是否会在那里遇到任何问题，但它有点脏 - Spring 对使用 Kafka 提供了非常好的内置支持，所以我会倾向于那个(网上有很多关于它的文档，但一个很好的文档是:https://www.baeldung.com/spring-kafka).

I'm not sure if you'll run into any issues there but it's a bit dirty - Spring has really nice built in support for working with Kafka so I would lean towards that (there's plenty of documentation on that on the web, but a nice one is: https://www.baeldung.com/spring-kafka).

您需要以下依赖项:

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
    <version>2.2.2.RELEASE</version>
</dependency>

配置就像将 @EnableKafka 注释添加到配置类，然后设置 Listener 和 ConsumerFactory bean 一样简单

Configuration is as easy adding the @EnableKafka annotation to a config class and then setting up Listener and ConsumerFactory beans

配置完成后，您可以轻松设置消费者，如下所示:

Once configured you can setup a consumer easily as follows:

@KafkaListener(topics = "topicName")
public void listenWithHeaders(
  @Payload String message, 
  @Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partition) {
      System.out.println("Received Message: " + message"+ "from partition: " + partition);
}

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