code: public void close() {
  
          try {
              rwLock.writeLock().lock();
              closeNoRWLock();
          } finally {
              rwLock.writeLock().unlock();
          }
  
          if (this.deleteDiskFiles) {
              deleteDiskCacheFiles();
              this.deleteDiskFiles = false;
          }
      }
docs: ***********************************************************************
  close()
  Close all HTOD instances and then the filemanager.
  ***********************************************************************