java - 如何暂时禁用Spring缓存的缓存

Question

我有一个用 @Cacheable 注释注释的 spring bean，定义如下

@Service
public class MyCacheableBeanImpl implements MyCacheableBean {
    @Override
    @Cacheable(value = "cachedData")
    public List<Data> getData() { ... }
}

我需要此类能够禁用缓存并仅处理来自原始源的数据。这应该基于来自外部的某些事件而发生。这是我的方法:

@Service
public class MyCacheableBeanImpl implements MyCacheableBean, ApplicationListener<CacheSwitchEvent> {
    //Field with public getter to use it in Cacheable condition expression
    private boolean cacheEnabled = true;

    @Override
    @Cacheable(value = "cachedData", condition = "#root.target.cacheEnabled") //exression to check whether we want to use cache or not
    public List<Data> getData() { ... }

    @Override
    public void onApplicationEvent(CacheSwitchEvent event) {
        // Updating field from application event. Very schematically just to give you the idea
        this.cacheEnabled = event.isCacheEnabled();
    }

    public boolean isCacheEnabled() {
        return cacheEnabled;
    }

}

我担心的是这种方法的“魔法”程度非常高。我什至不确定如何测试这是否可行(基于 spring 文档，这应该可行，但如何确定)。我做对了吗？如果我错了，如何改正？

Answer 1

我一直在寻找的是 NoOpCacheManager:

为了让它工作，我从 xml bean 创建切换到工厂

我做了如下事情:

    @Bean
public CacheManager cacheManager() {
    final CacheManager cacheManager;        
    if (this.methodCacheManager != null) {
        final EhCacheCacheManager ehCacheCacheManager = new EhCacheCacheManager();
        ehCacheCacheManager.setCacheManager(this.methodCacheManager);
        cacheManager = ehCacheCacheManager;
    } else {
        cacheManager = new NoOpCacheManager();
    }

    return cacheManager;
}