Much work on generalizing the notion of message "transport" and

allowing the use of annotations to customize transport for 
DObject fields and service/receiver methods.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5099 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/net/Message.java

@@ -0,0 +1,50 @@
+//
+// $Id: DownstreamMessage.java 5090 2008-05-13 21:12:39Z andrzej $
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2007 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.SimpleStreamableObject;
+
+/**
+ * The superclass of {@link UpstreamMessage} and {@link DownstreamMessage}.
+ */
+public abstract class Message extends SimpleStreamableObject
+{
+    /**
+     * Sets the message transport parameters.  For messages received over the network, these
+     * describe the mode of transport over which the message was received.  When sending messages,
+     * they act as a hint as to the type of transport desired.  Calling this method may have no
+     * effect, depending on whether non-default modes of transport are supported for this message
+     * type.
+     */
+    public void setTransport (Transport transport)
+    {
+        // no-op by default
+    }
+
+    /**
+     * Returns the message transport parameters.
+     */
+    public Transport getTransport ()
+    {
+        return Transport.DEFAULT;
+    }
+}