使用 @RefreshScope 在不更改配置的情况下刷新 Bean

Question

我有一个@Configuration 类如下：

@Configuration
public class SampleKieConfiguration {

    @Bean
    public KieServices kieServices() {
        return KieServices.Factory.get();
    }

    @Bean
    public KieContainer kieContainer() {

        ReleaseId releaseId = kieServices().newReleaseId("groupId", "artifactId", "version");
        KieContainer kieContainer = kieServices().newKieContainer(releaseId);
        kieServices().newKieScanner(kieContainer).start(10_000);
        return  kieContainer;
    }

    @Bean
    public KieBase kieBase() {

        KieBaseConfiguration kieBaseConfiguration = kieServices().newKieBaseConfiguration();
        kieBaseConfiguration.setOption(EqualityBehaviorOption.EQUALITY);
        kieBaseConfiguration.setOption(EventProcessingOption.CLOUD);
        return kieContainer().newKieBase(kieBaseConfiguration);
    }
}

kieServices().newKieScanner(kieContainer).start(10_000); 行基本上轮询远程 maven 存储库并每 10 秒刷新一次 kieContainer 对象，如果有新的工件。

在我的上层（例如服务层）的某个地方，我有：

@Service
@RefreshScope
public class SampleService {

    @Autowired
    private KieBase kBase;

}

当我调用/refresh 端点时，据我所知，kBase 对象没有刷新（至少没有使用新的kieContainer 对象）。我没有集中配置，当我致电/refresh 时收到警告。我想要实现的是每次刷新kieContainer 时都有一个新的kBase 对象。我怎样才能做到这一点？谢谢！

Answer 1

如文档所述：

@RefreshScope works (technically) on an @Configuration class, but it might lead to surprising behaviour:
e.g. it does not mean that all the @Beans defined in that class are themselves @RefreshScope.
Specifically, anything that depends on those beans cannot rely on them being updated when a refresh is initiated,
unless it is itself in @RefreshScope (in which it will be rebuilt on a refresh and its dependencies re-injected,
at which point they will be re-initialized from the refreshed @Configuration).

所以我猜你还必须直接在 KieBase @Bean 上注释 @RefreshScope。

Answer 2

刷新不会遍历层次结构。它只是清除缓存并在下一次引用（通过它创建的代理）时重新创建 bean。在您的情况下，由于 KieBase 不是 @RefreshScope，因此不会重新创建它。所以将@RefreshScope 添加到KieBase 声明中。如果SampleService 真的不需要重新创建，请删除@RefreshScope 注释。