docs: public static void invalidate() {
          final SharedMappedFilesCache oldCache;
          synchronized (syncObject) {
              oldCache = SharedMappedFilesCache.theCache;
              SharedMappedFilesCache.theCache = null;
          }
          if (oldCache != null) {
              for (final SharedMappedByteBuffer buffer : oldCache.cache.values()) {
                  buffer.close();
              }
          }
      }