BoundedConcurrentHashMap.EvictionListener should have a bulk entry listener so that CacheStores can optimize passivation behavior. Current BoundedConcurrentHashMap notifies EvictionListener for every evicted entry. However, as you see from BoundedConcurrentHashMap.Segment.attemptEviction(..), eviction often happens in bulk. If these evicted entries are supposed to be passivated, it is often beneficial to begin a transaction because it often takes much less time to call commit() less often. If N entries are evicted:

without bulk eviction:

    store.store(e1); – each store implied a commit()

    store.store(..);

    store.store(eN);

with bulk eviction:

    store.begin(mods(e1, ..., eN), tx, true);