지정한 시간동안 지정한 최대 개수만큼만 저장했다가 자동으로 삭제되는 맵, 캐시와 유사 : A high performance, low-overhead, zero dependency, thread-safe ConcurrentMap implementation that expires entries. 참조: https://github.com/jhalterman/expiringmap GitHub - jhalterman/expiringmap: A high performance thread-safe map that expires entries A high performance thread-safe map that expires entries - GitHub - jhalterman/expiringmap: A high p..