Progress on the presents client.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3848 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/presents/net/PingRequest.as

@@ -0,0 +1,38 @@
+package com.threerings.presents.net {
+
+import com.threerings.io.ObjectOutputStream;
+
+public class PingRequest extends UpstreamMessage
+{
+    /** The number of milliseconds of idle upstream that are allowed to elapse
+     * before the client sends a ping message to the server to let it
+     * know that we're still alive. */
+    public static const PING_INTERVAL :int = 60 * 1000;
+
+    public function PingRequest ()
+    {
+        super();
+    }
+
+    public function getPackStamp () :Number
+    {
+        return _packStamp;
+    }
+
+    // documentation inherited
+    public function writeObject (out :ObjectOutputStream)
+    {
+        _packStamp = new Date().getTime();
+        super.writeObject(out);
+    }
+
+    // documentation inherited
+    public function readObject (ins :ObjectInputStream)
+    {
+        trace("read PingRequest on the client?");
+    }
+
+    /** A time stamp obtained when we serialize this object. */
+    protected var _packStamp :Number;
+}
+}