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发布于 2023-12-11 / 70 阅读 / 0 评论 / 0 点赞

Nacos动态刷新bean

RefreshScope原理

  1. Nacos订阅应用启动事件注册listener

com.alibaba.cloud.nacos.refresh.NacosContextRefresher#onApplicationEvent ——>

com.alibaba.cloud.nacos.refresh.NacosContextRefresher#registerNacosListenersForApplications——>

com.alibaba.cloud.nacos.refresh.NacosContextRefresher#registerNacosListener ——>

com.alibaba.nacos.api.config.ConfigService#addListener

  1. Worker发布事件

com.alibaba.nacos.client.config.impl.ClientWorker.ConfigRpcTransportClient#notifyListenConfig——>

com.alibaba.nacos.client.config.impl.ClientWorker.ConfigRpcTransportClient#startInternal(while -> poll)——>

com.alibaba.nacos.client.config.impl.ClientWorker.ConfigRpcTransportClient#executeConfigListen——>

com.alibaba.nacos.client.config.impl.ClientWorker#refreshContentAndCheck(java.lang.String)——>

com.alibaba.nacos.client.config.impl.CacheData#checkListenerMd5——>

com.alibaba.nacos.client.config.impl.CacheData#safeNotifyListener——>

com.alibaba.nacos.api.config.listener.Listener#receiveConfigInfo

org.springframework.cloud.endpoint.event.RefreshEventListener#handle(org.springframework.cloud.endpoint.event.RefreshEvent) ——>

org.springframework.cloud.context.refresh.ContextRefresher#refresh ——>

org.springframework.cloud.context.scope.refresh.RefreshScope#refreshAll ——>

实现自定义类刷新

@Slf4j
@Component
public class MinioConfigChangeListener implements ApplicationListener<RefreshScopeRefreshedEvent>, ApplicationContextAware {
    private ApplicationContext applicationContext;
    @Resource
    private List<MinioTemplate> minioTemplateList;

    @Override
    public void onApplicationEvent(RefreshScopeRefreshedEvent event) {
        MinioProperties minioProperties = applicationContext.getBean(MinioProperties.class);

        Map<String, MinioProperties.MinioItem> idToItemMap = minioProperties.getItems().stream().collect(Collectors.toMap(MinioProperties.MinioItem::getId, Function.identity()));

        for (MinioTemplate minioTemplate : minioTemplateList) {
            MinioProperties.MinioItem minioItem = minioTemplate.minioItem();
            String itemId = minioItem.getId();
            MinioProperties.MinioItem newItem = idToItemMap.get(itemId);
            minioTemplate.setMinioItem(newItem);
            MinioClient newClient = MinioClient.builder().endpoint(newItem.getEndpoint()).credentials(newItem.getAccessKey(), newItem.getSecretKey()).region(newItem.getRegion()).build();
            minioTemplate.setMinioClient(newClient);
        }
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}


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