数据库驱动要素切换

Question

我希望基于数据库值启用我的新功能。如果为该功能设置了数据库值，则应启用新代码。否则，它应该切换并流向旧代码。在Java/Spring中有没有办法做到这一点？我不想频繁地访问数据库，我在考虑请求开始时的一个调用。有没有这样的例子？如果是这样，请让我知道。谢谢

Answer 1

创建要素类实现：

public enum CustomFeatures implements Feature {
    @Label("Activates customFeature")
    MY_CUSTOM_FEATURE;

    public boolean isActive() {
        return FeatureContext.getFeatureManager().isActive(this);
    }
}

创建功能提供程序：

@Bean
public FeatureProvider featureProvider() {
    return new EnumBasedFeatureProvider(CustomFeatures.class);
}

创建实体和存储库：

@Entity
public class Feature {

    private String name;
    private Boolean active;
    // getters-setters
}

创建@Component，它将查询数据库并设置新的要素状态

@Component
public class FeatureToggler {

   private final FeatureRepository featureRepository;
   private final FeatureManager featureManager;

   private FeatureToggler(FeatureRepository featureRepository, FeatureManager featureManager) {
      this.featureRepository = featureRepository;
      this.featureManager = featureManager;
   }

   @Schedule(fixedRate=60000)
   public void refreshFeatureToggles() {
        featureManager.setFeatureState(new FeatureState(CustomFeatures.MY_CUSTOM_FEATURE, featureRepository.findByName().isActive);
   }


}

现在您可以像这样使用check if feature enabled：

if(CustomFeatures.MY_CUSTOM_FEATURE.isActive()) {
}

或者使用Spring方面..