java - Google Guava Cache 引用值较弱，未给出驱逐通知

Question

我在我们的应用程序中基于weakValues使用了google guava，如下所示。

CacheBuilder
            .newBuilder()
            .weakValues()
            .concurrencyLevel(Runtime.getRuntime().availableProcessors())
            .removalListener(removalListener)
            .build(cacheLoader);

删除监听器不会在缓存弱值被删除后立即调用。我必须基于此清除 native 资源，因此我的程序结束时不会在 native 端释放内存。这是一个已知问题吗？

Answer 1

在 Google Guava docs ，它说如下:

Caches built with CacheBuilder do not perform cleanup and evict values "automatically," or instantly after a value expires, or anything of the sort. Instead, it performs small amounts of maintenance during write operations, or during occasional read operations if writes are rare.

还解释了他们做出此决定的原因以及可用的替代方案。