public void messageSent(Message message) {
          if (message.getID().equals(BTMessage.ID_BT_PIECE)) {
            try {
              lock_mon.enter();

              // due to timing issues we can get in here with a message already removed

              queued_messages.remove(message);

            } finally {
              lock_mon.exit();
            }

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

            	outgoing_message_queue.setTrace( true );

            	// BTPiece p = (BTPiece)message;

            	// TimeFormatter.milliTrace( "obt sent: " + p.getPieceNumber() + "/" + p.getPieceOffset());
            }
            */

            doReadAheadLoads();
          }
        }
  public ByteBuffer destroy() {
    if (destroyed) {
      Debug.out("Trying to redestroy message decoder, stack trace follows: " + this);
      Debug.outStackTrace();
    }

    is_paused = true;
    destroyed = true;

    // there's a concurrency issue with the decoder whereby it can be destroyed while will being
    // messed with. Don't
    // have the energy to look into it properly atm so just try to ensure that it doesn't bork too
    // badly (parg: 29/04/2012)
    // only occasional but does have potential to generate direct buffer mem leak ;(

    int lbuff_read = 0;
    int pbuff_read = 0;
    length_buffer.limit(SS, 4);

    DirectByteBuffer plb = payload_buffer;

    if (reading_length_mode) {
      lbuff_read = length_buffer.position(SS);
    } else { // reading payload
      length_buffer.position(SS, 4);
      lbuff_read = 4;
      pbuff_read = plb == null ? 0 : plb.position(SS);
    }

    ByteBuffer unused = ByteBuffer.allocate(lbuff_read + pbuff_read); // TODO convert to direct?

    length_buffer.flip(SS);
    unused.put(length_buffer.getBuffer(SS));

    try {
      if (plb != null) {
        plb.flip(SS);
        unused.put(
            plb.getBuffer(
                SS)); // Got a buffer overflow exception here in the past - related to PEX?
      }
    } catch (RuntimeException e) {
      Debug.out("hit known threading issue");
    }

    unused.flip();

    length_buffer.returnToPool();

    if (plb != null) {
      plb.returnToPool();
      payload_buffer = null;
    }

    try {
      for (int i = 0; i < messages_last_read.size(); i++) {
        Message msg = (Message) messages_last_read.get(i);
        msg.destroy();
      }
    } catch (RuntimeException e) {
      // happens if messages modified by alt thread...
      Debug.out("hit known threading issue");
    }
    messages_last_read.clear();

    return unused;
  }