ben-manes commented on issue #4475:
URL: https://github.com/apache/shenyu/issues/4475#issuecomment-1471398801
It looks like the request is to use a weak cache for the static `ALL` field
so that instances may be collected when there are no strong references held by
the application. As this is a static field that can be called by multiple
threads, it should also be thread-safe. It doesn't look like ordering matters,
so you could use a Caffeine weakKey cache with `Collections.newSetFromMap`.
Something like,
```java
private static final Set<MemorySafeWindowTinyLFUMap<?, ?>> ALL =
Collections.newSetFromMap(
Caffeine.newBuilder().weakKeys().<MemorySafeWindowTinyLFUMap<?,
?>>build().asMap());
```
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