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    1. POSimple Java hash map with weak keys based on identity in Google Guava?
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    1. USKevin Bourrillion
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      1. VTUpMod
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    1. COI've edited the question to be clearer that it was my understanding from the documentation that Guava wants me to switch to `CacheBuilder`, as it deprecated so much of `MapMaker`. If `MapMaker` is still find to use for certain situations, that's fine with me. And I don't think the concurrency I was talking about is the same thing you're talking about, as the GC's releasing of weak references happens without the need to add any sort of extra multithreaded support to the application (e.g. a single thread doesn't need a lock to access a `WeakReference`).
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      1. USGarret Wilson
    2. CO@GarretWilson When that weak reference is cleared, something has to cause the entry to get cleaned up from the map. That something can happen concurrently to your application threads.
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      1. USKevin Bourrillion
    3. COThis is not necessarily what happens in `WeakHashMap`, and that's not the same thing as the "concurrency" in the sense of `MapMaker` and `CacheBuilder`. `WeakHashMap` synchronizes on its queue whenever it expunges expired references---but this doesn't make `WeakHashMap` "concurrent" (it is fail-safe and throws a `ConcurrentModificationException`). `ConcurrentHashMap` (and things produced by `MapMaker`) bring true concurrency for multi-thread access by essentially maintaining multiple maps internally---something I don't need or want if I control access at a higher level using read/write locks.
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