Plain-old-caches and even concurrent-aware maps do this too--several are the cases where I've slapped a Guava or Caffeine cache into place for quick 'n dirty co

Plain-old-caches and even concurrent-aware maps do this too--several are the cases where I've slapped a Guava or Caffeine cache into place for quick 'n dirty concurrency control and key coalescing, even with a short TTL.