WeakHashMap是否有java.util.concurrent等价物？ [英] Is there java.util.concurrent equivalent for WeakHashMap?

问题描述

是否可以使用 Collections.synchronizedMap（）重写下面的代码片段，同时保持并发性的正确性？

Can the following piece of code be rewritten w/o using Collections.synchronizedMap() yet maintaining correctness at concurrency?

Collections.synchronizedMap(new WeakHashMap<Class, Object>());

即。有什么来自java.util.concurrent可以使用吗？请注意，仅替换为

i.e. is there something from java.util.concurrent one can use instead? Note that merely replacing with

new ConcurrentHashMap<Class, Object>(new WeakHashMap<Class, Object>()));

显然不起作用

推荐答案

番石榴的 CacheBuilder 类允许您轻松完成此任务。

Guava's CacheBuilder class allows you to do this easily.

CacheBuilder.newBuilder().weakKeys().build()

请注意，这会将键等同语义更改为 == 而不是 .equals（）在您使用 Class 实例的情况下无关紧要，但这是一个潜在的陷阱。

Note that this changes key equality semantics to be == instead of .equals() which will not matter in your case of using Class instances but is a potential pitfall.

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