Added SessionObserver which is a pared down version of ClientObserver that

only reports logon and logoff.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1117 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/client/SessionObserver.java

@@ -0,0 +1,32 @@
+//
+// $Id: SessionObserver.java,v 1.1 2002/03/11 19:51:25 mdb Exp $
+
+package com.threerings.presents.client;
+
+/**
+ * A session observer is registered with the client instance to be
+ * notified when the client establishes and ends their session with the
+ * server.
+ *
+ * <p> These callbacks happen on the client thread and should therefore
+ * not be used to perform any complex action or do much more than relay
+ * the signal to some other thread (like the AWT thread) to act more fully
+ * on the notice.
+ *
+ * @see ClientObserver
+ */
+public interface SessionObserver
+{
+    /**
+     * Called after the client successfully connected to and authenticated
+     * with the server. The entire object system is up and running by the
+     * time this method is called.
+     */
+    public void clientDidLogon (Client client);
+
+    /**
+     * Called after the client has been logged off of the server and has
+     * disconnected.
+     */
+    public void clientDidLogoff (Client client);
+}