long lastAccessTime = 0;
      long lastWriteTime = 0;
      for (ReferenceEntry<K, V> e : segment.recencyQueue) {
        long accessTime = e.getAccessTime();
        assertThat(accessTime).isAtLeast(lastAccessTime);
        lastAccessTime = accessTime;
        long writeTime = e.getWriteTime();
        assertThat(writeTime).isAtLeast(lastWriteTime);
        lastWriteTime = writeTime;
      }

      long lastAccessTime = 0;
      long lastWriteTime = 0;
      for (ReferenceEntry<K, V> e : segment.recencyQueue) {
        long accessTime = e.getAccessTime();
        assertThat(accessTime).isAtLeast(lastAccessTime);
        lastAccessTime = accessTime;
        long writeTime = e.getWriteTime();
        assertThat(writeTime).isAtLeast(lastWriteTime);
        lastWriteTime = writeTime;
      }

    }

    void close(final int f, final long lastWriteTime) throws SmbException {

        if (LogStream.level >= 3) {
            log.println("close: " + f);
        }

        /*
         * Close Request / Response
         */

        send(new SmbComClose(f, lastWriteTime), blank_resp());
    }

    void close(final long lastWriteTime) throws SmbException {
        if (!isOpen()) {