| Class | Description | 
|---|---|
| ConcurrentCache<K,V> | |
| ManagedConcurrentWeakHashMap<K,V> | Concurrent hash map that holds its keys via weak references. | 
| SynchronizedStack<T> | This is intended as a (mostly) GC-free alternative to
  ConcurrentLinkedQueuewhen the requirement is to
 create a pool of re-usable objects with no requirement to shrink the pool. | 
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