--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tango/tango/net/cluster/model/IMessage.d	Fri Jan 11 17:57:40 2008 +0100
@@ -0,0 +1,109 @@
+/*******************************************************************************
+
+        copyright:      Copyright (c) 2004 Kris Bell. All rights reserved
+
+        license:        BSD style: $(LICENSE)
+        
+        version:        July 2004: Initial release      
+        
+        author:         Kris
+
+*******************************************************************************/
+
+module tango.net.cluster.model.IMessage;
+
+public import tango.time.Time;
+
+public import tango.io.protocol.model.IReader,
+              tango.io.protocol.model.IWriter;
+
+/*******************************************************************************
+
+*******************************************************************************/
+
+interface IMessage : IReadable, IWritable
+{
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        char[] toString ();
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        IMessage clone ();
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        void reply (char[] channel);
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        char[] reply ();
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        void time (Time value);
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        Time time ();
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        void id (uint value);
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        uint id ();
+
+        /***********************************************************************
+
+        ***********************************************************************/
+        
+        void execute ();
+}
+
+
+/******************************************************************************
+
+        Manages the lifespan of an ICache entry. These loaders effectively
+        isolate the cache from whence the content is derived. It's a good
+        idea to employ this abstraction where appropriate, since it allows
+        the cache source to change with minimal (if any) impact on client
+        code.
+
+******************************************************************************/
+
+interface IMessageLoader
+{
+        /**********************************************************************
+
+                Load a cache entry from wherever the content is persisted.
+                The 'time' argument represents that belonging to a stale
+                entry, which can be used to optimize the loader operation
+                (no need to perform a full load where there's already a 
+                newer version in an L2 cache). This 'time' value will be
+                long.min where was no such stale entry.
+
+        **********************************************************************/
+
+        IMessage load ();
+}
+
+
+