Soft/Weak key MapMAker with equals for key

I need a Concurrent Hash Map with Weak or Soft keys were the equality is equals and not ==.

For this kind of keys, google collection chooses == by default.

Is there a w开发者_C百科ay to override this choice? How should I proceed?

Best regards,

Nicolas.

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You can't do that in google-collections. You can't do it in guava either, currently. However, they have added an Equivalence interface and the implementations you'd expect for it (equals, null-aware equals and ==) recently and it seems like they might allow you to specify what Equivalence should be used for keys/values in the future (see this issue). MapMaker code seems to be undergoing some changes at this time.

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You can use java.util.WeakHashMap, wrapped with a call to Collections.synchronizedMap()

It won't be as fast as a ConcurrentHashMap if thread contention is significant. But it has the behaviour you want.