Question

我有一个Spring bean，它在其方法上使用dropwizard-metrics注释来度量某些度量（请参阅#parse方法）：

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如您所见，这个bean向执行者服务提交了一个新任务，该任务不是bean，但是需要引用 Consumer bean来重用其逻辑（请参见 consumer。 parse（record）; 调用）：

@Component
public class Consumer extends AbstractConsumer {

  @Autowired
  private EventsService eventsService;

  private ExecutorService executor;

  @PostConstruct
  void init() throws Exception {
    executor = Executors.newFixedThreadPool(1);

    ConsumerEventsHandler consumer = new ConsumerEventsHandler(Arrays.asList("topic1"), this);
    executor.submit(consumer);
  }

  @Timed(name = CONSUMER_BATCH_PARSING_TIME, absolute = true)
  public void parse(ConsumerRecord<String, String> record) {
    String val = record.value();
    eventsService.parseToDB(val);
  }
}

这是指标配置（我使用“ ryantenney / metrics-spring”库）：

public class ConsumerEventsHandler implements Runnable {

private Consumer consumer;
private List<String> topics;
protected final KafkaConsumer<String, String> kafkaConsumer;

public ConsumerEventsHandler(List<String> topics, Consumer consumer) {
    this.topics = topics;
    this.consumer = consumer;
    this.kafkaConsumer = new KafkaConsumer<>();
}

@Override
public void run() {
    try {
        consumer.subscribe(topics);
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(Long.MAX_VALUE);

            for (ConsumerRecord<String, String> record : records) {
                consumer.parse(record);
            }
        }
    } finally {
        consumer.close();
    }
}

}

结果，我看到 Consumer bean被代理，但是 ConsumerEventsHandler 包含对普通bean的引用，原因是它是在 Consumer的通过'new ConsumerEventsHandler（..）' Consumer bean的@PostConstruct方法尚未被代理，我认为@PostConstruct是在进行处理之前调用的。

我看到的唯一解决方法是每次在#run方法内通过ApplicationContext＃getBean获取 Consumer bean引用，而不是将引用存储在 ConsumerEventsHandler 类变量中。还有其他解决方案吗？

Answer 1

只需在非春季课程上创建一个静态

public class ConsumerEventsHandler implements Runnable {

private static Consumer consumer;
private List<String> topics;
protected final KafkaConsumer<String, String> kafkaConsumer;

public ConsumerEventsHandler(List<String> topics) {
    this.topics = topics;
    this.kafkaConsumer = new KafkaConsumer<>();
}

public static setConsumer(Consumer consumer) {
    ConsumerEventsHandler.consumer = consumer;
}

然后在您的春天那边，您可以：

  @PostConstruct()
  public void init() {
    configureReporters(registry);
    ConsumerEventsHandler.setConsumer(consumer);
  }

来自非bean类的spring访问代理bean

1 个答案: