//
// $Id: DownstreamMessage.java,v 1.13 2004/08/27 02:20:22 mdb Exp $
//
// Narya library - tools for developing networked games
// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
// http://www.threerings.net/code/narya/
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

package com.threerings.presents.net;

import com.threerings.io.TrackedStreamableObject;

/**
 * This class encapsulates a message in the distributed object protocol
 * that flows from the server to the client. Downstream messages include
 * object subscription, event forwarding and session management.
 */
public abstract class DownstreamMessage extends TrackedStreamableObject
{
    /**
     * The message id of the upstream message with which this downstream
     * message is associated (or -1 if it is not associated with any
     * upstream message).
     */
    public short messageId = -1;

    /**
     * Generates a string representation of this instance.
     */
    public String toString ()
    {
        return "[msgid=" + messageId + "]";
    }
}
