protected abstract void doSend( Request request ) throws IOException;
    protected abstract void doRecv( Response response ) throws IOException;
    protected abstract void doSkip() throws IOException;

    public synchronized void sendrecv( Request request,
                    Response response,
                    long timeout ) throws IOException {
            makeKey( request );

    protected abstract void doSend ( Request request ) throws IOException;


    protected abstract void doRecv ( Response response ) throws IOException;


    protected abstract void doSkip ( Long key ) throws IOException;


    /**
     * 
     * @return whether the transport is disconnected
     */
    public boolean isDisconnected () {

                log.println( response );
                if (log.level >= 6) {
                    Hexdump.hexdump( log, BUF, 4, size );
                }
            }
        }
    }
    protected void doSkip() throws IOException {
        int size = Encdec.dec_uint16be( sbuf, 2 ) & 0xFFFF;
        if (size < 33 || (4 + size) > rcv_buf_size ) {
            /* log message? */
            in.skip( in.available() );

            }
        }
        finally {
            getContext().getBufferCache().releaseBuffer(buffer);
        }
    }


    @Override
    protected void doSkip ( Long key ) throws IOException {
        synchronized ( this.inLock ) {
            int size = Encdec.dec_uint16be(this.sbuf, 2) & 0xFFFF;

      } else {
        // This is a subsequent part or a preamble. Skip until "\r\n--" followed by the boundary.
        while (true) {
          val toSkip = currentPartBytesRemaining(maxResult = 8192)
          if (toSkip == 0L) break
          source.skip(toSkip)
        }
        source.skip(crlfDashDashBoundary.size.toLong())
      }

      // Read either \r\n or --\r\n to determine if there is another part.

      byteCount: Long,
    ) {
      val toRead = minOf(remainingByteCount, byteCount)
      if (toRead > 0L) {
        source.read(buffer, toRead)
      }
      val toSkip = byteCount - toRead
      if (toSkip > 0L) {
        source.skip(toSkip)
      }
      remainingByteCount -= toRead
      receivedByteCount += byteCount
    }

    @Throws(IOException::class)
    override fun flush() {
    }

      @Override
      public Iterator<T> iterator() {
        if (iterable instanceof List) {
          final List<T> list = (List<T>) iterable;
          int toSkip = Math.min(list.size(), numberToSkip);
          return list.subList(toSkip, list.size()).iterator();
        }
        final Iterator<T> iterator = iterable.iterator();

        Iterators.advance(iterator, numberToSkip);

        /*