private void doReadAheadLoads() {
    List to_submit = null;
    try {
      lock_mon.enter();

      while (loading_messages.size() + queued_messages.size() < request_read_ahead
          && !requests.isEmpty()
          && !destroyed) {
        DiskManagerReadRequest dmr = (DiskManagerReadRequest) requests.removeFirst();
        loading_messages.add(dmr);
        if (to_submit == null) to_submit = new ArrayList();
        to_submit.add(dmr);
      }
    } finally {
      lock_mon.exit();
    }

    /*
    if ( peer.getIp().equals( "64.71.5.2")){

    	TimeFormatter.milliTrace( "obt read_ahead: -> " + (to_submit==null?0:to_submit.size()) +
    			" [lo=" + loading_messages.size() + ",qm=" + queued_messages.size() + ",re=" + requests.size() + ",rl=" + request_read_ahead + "]");
    }
    */

    if (to_submit != null) {
      for (int i = 0; i < to_submit.size(); i++) {
        peer.getManager()
            .getAdapter()
            .enqueueReadRequest(peer, (DiskManagerReadRequest) to_submit.get(i), read_req_listener);
      }
    }
  }
  /**
   * Queue a new have message for aggregated sending.
   *
   * @param piece_number of the have message
   * @param force if true, send this and any other pending haves right away
   */
  public void queueHaveMessage(int piece_number, boolean force) {
    if (destroyed) return;

    try {
      pending_haves_mon.enter();

      pending_haves.add(new Integer(piece_number));
      if (force) {
        sendPendingHaves();
      } else {
        int pending_bytes = pending_haves.size() * 9;
        if (pending_bytes >= outgoing_message_q.getMssSize()) {
          // System.out.println("enough pending haves for a full packet!");
          // there's enough pending bytes to fill a packet payload
          sendPendingHaves();
        }
      }
    } finally {

      pending_haves_mon.exit();
    }
  }
  private int postReadProcess() throws IOException {
    int prot_bytes_read = 0;
    int data_bytes_read = 0;

    if (!reading_length_mode && !destroyed) { // reading payload data mode
      // ensure-restore proper buffer limits
      payload_buffer.limit(SS, message_length);
      length_buffer.limit(SS, 4);

      int read = payload_buffer.position(SS) - pre_read_start_position;

      if (payload_buffer.position(SS) > 0) { // need to have read the message id first byte
        if (BTMessageFactory.getMessageType(payload_buffer) == Message.TYPE_DATA_PAYLOAD) {
          data_bytes_read += read;
        } else {
          prot_bytes_read += read;
        }
      }

      if (!payload_buffer.hasRemaining(SS) && !is_paused) { // full message received!
        payload_buffer.position(SS, 0);

        DirectByteBuffer ref_buff = payload_buffer;
        payload_buffer = null;

        if (reading_handshake_message) { // decode handshake
          reading_handshake_message = false;

          DirectByteBuffer handshake_data =
              DirectByteBufferPool.getBuffer(DirectByteBuffer.AL_MSG_BT_HAND, 68);
          handshake_data.putInt(SS, HANDSHAKE_FAKE_LENGTH);
          handshake_data.put(SS, ref_buff);
          handshake_data.flip(SS);

          ref_buff.returnToPool();

          try {
            Message handshake =
                MessageManager.getSingleton()
                    .createMessage(BTMessage.ID_BT_HANDSHAKE_BYTES, handshake_data, (byte) 1);
            messages_last_read.add(handshake);
          } catch (MessageException me) {
            handshake_data.returnToPool();
            throw new IOException("BT message decode failed: " + me.getMessage());
          }

          // we need to auto-pause decoding until we're told to start again externally,
          // as we don't want to accidentally read the next message on the stream if it's an
          // AZ-format handshake
          pauseDecoding();
        } else { // decode normal message
          try {
            messages_last_read.add(createMessage(ref_buff));
          } catch (Throwable e) {
            ref_buff.returnToPoolIfNotFree();

            // maintain unexpected errors as such so they get logged later

            if (e instanceof RuntimeException) {

              throw ((RuntimeException) e);
            }

            throw new IOException("BT message decode failed: " + e.getMessage());
          }
        }

        reading_length_mode = true; // see if we've already read the next message's length
        percent_complete = -1; // reset receive percentage
      } else { // only partial received so far
        percent_complete =
            (payload_buffer.position(SS) * 100) / message_length; // compute receive percentage
      }
    }

    if (reading_length_mode && !destroyed) {
      length_buffer.limit(SS, 4); // ensure proper buffer limit

      prot_bytes_read +=
          (pre_read_start_buffer == 1)
              ? length_buffer.position(SS) - pre_read_start_position
              : length_buffer.position(SS);

      if (!length_buffer.hasRemaining(SS)) { // done reading the length
        reading_length_mode = false;

        length_buffer.position(SS, 0);
        message_length = length_buffer.getInt(SS);

        length_buffer.position(SS, 0); // reset it for next length read

        if (message_length == HANDSHAKE_FAKE_LENGTH) { // handshake message
          reading_handshake_message = true;
          message_length = 64; // restore 'real' length
          payload_buffer =
              DirectByteBufferPool.getBuffer(DirectByteBuffer.AL_MSG_BT_HAND, message_length);
        } else if (message_length == 0) { // keep-alive message
          reading_length_mode = true;
          last_received_was_keepalive = true;

          try {
            Message keep_alive =
                MessageManager.getSingleton()
                    .createMessage(BTMessage.ID_BT_KEEP_ALIVE_BYTES, null, (byte) 1);
            messages_last_read.add(keep_alive);
          } catch (MessageException me) {
            throw new IOException("BT message decode failed: " + me.getMessage());
          }
        } else if (message_length < MIN_MESSAGE_LENGTH || message_length > MAX_MESSAGE_LENGTH) {
          throw new IOException(
              "Invalid message length given for BT message decode: " + message_length);
        } else { // normal message
          payload_buffer =
              DirectByteBufferPool.getBuffer(DirectByteBuffer.AL_MSG_BT_PAYLOAD, message_length);
        }
      }
    }

    protocol_bytes_last_read += prot_bytes_read;
    data_bytes_last_read += data_bytes_read;

    return prot_bytes_read + data_bytes_read;
  }