SpringBoot：在上次使用/初始化阶段后销毁bean

发布于 2025-01-12 07:59:10 字数 874 浏览 4 评论 0原文

我有一个 Closeable bean，仅在应用程序初始化期间使用，但稍后不再使用。它打开初始化期间使用的资源。我希望在最后一次使用该对象后尽早调用 close 方法。是否可以自动销毁物体。

示例

@Component
@Slf4j
public class InitHelper implements Closeable {
  public InitHelper() {
    log.debug("Initialized InitHelper");
  }
  public int hello() {
    return 42;
  }
  @PreDestroy
  public void close() {
    log.debug("Closed InitHelper");
  }
}

@Configuration
public class AppConfig {
  @Bean
  public A a(InitHelper initHelper) {
    return new A(initHelper.hello());
  }

  @Bean
  public B b(InitHelper initHelper) {
    return new A(initHelper.hello());
  }
}

预期行为

InitHelper bean 在 A 和 B 之前初始化，并在 a 和 b< /code> 已完成。

实际行为

不会在其实例上调用 InitHelper.close 方法。

原文

I have a Closeable bean that I only use during initialization of the application, but not later. It opens a resource that is used during initialization. I would like the close method to be called as early as possible after the last use of the object. Is it possible to auto-destroy objects.

Example

@Component
@Slf4j
public class InitHelper implements Closeable {
  public InitHelper() {
    log.debug("Initialized InitHelper");
  }
  public int hello() {
    return 42;
  }
  @PreDestroy
  public void close() {
    log.debug("Closed InitHelper");
  }
}

@Configuration
public class AppConfig {
  @Bean
  public A a(InitHelper initHelper) {
    return new A(initHelper.hello());
  }

  @Bean
  public B b(InitHelper initHelper) {
    return new A(initHelper.hello());
  }
}

Expected behavior

A InitHelper bean gets initialized before A and B and destroyed after a and b were completed.

Actual behavior

The InitHelper.close method is not called on its instance.

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尬尬 2025-01-19 07:59:10

正如 @Antoniossss 在评论中提到的，监听 ApplicationReadyEvent 是一种可能的解决方案。我的实现如下：

@EventListener(ApplicationReadyEvent.class)
public void closeMyResource(ApplicationReadyEvent event) {
  InitHelper initHelper = event.getApplicationContext().getBean(InitHelper.class);
  initHelper.close();
}

As @Antoniossss mentioned in the comments, listening for the ApplicationReadyEvent is a possible solution. I implemented it as follows:

@EventListener(ApplicationReadyEvent.class)
public void closeMyResource(ApplicationReadyEvent event) {
  InitHelper initHelper = event.getApplicationContext().getBean(InitHelper.class);
  initHelper.close();
}

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