Java multithreaded cache for objects that are hard to create?

Question

I need to cache some objects with rather hard creation times, and I need exactly one creation semantics. It should be possible to simultaneously create objects for different CacheKeys. I think I need something that (under the hood) does something like this:

ConcurrentHashMap<CacheKey, Future<HeavyObject>>

Are there existing open source versions that I can reuse?

Answer 1

Have you looked at the Guava MapMaker class? I think he will do everything you need - although instead Futureyou provide a class a Function<? super K, ? extends V>, which is used to calculate the value.

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Answer 2

- java-, Ehcache JBoss Cache.

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