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diff --git a/src/load_balancer.hpp b/src/load_balancer.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZS_LOAD_BALANCER_HPP_INCLUDED__
+#define __ZS_LOAD_BALANCER_HPP_INCLUDED__
+
+#include <vector>
+
+#include <i_demux.hpp>
+
+namespace zs
+{
+
+    //  Object to distribute messages to outbound pipes.
+
+    class load_balancer_t : public i_demux
+    {
+    public:
+
+        load_balancer_t ();
+
+        //  i_demux implementation.
+        void set_session (class session_t *session_);
+        void shutdown ();
+        void terminate ();
+        void attach_pipe (class pipe_writer_t *pipe_);
+        void detach_pipe (class pipe_writer_t *pipe_);
+        bool empty ();
+        bool send (struct zs_msg *msg_);
+        void flush ();
+
+    private:
+
+        //  Clean-up.
+        ~load_balancer_t ();
+
+        //  Reference to the owner session object.
+        class session_t *session;
+
+        //  Writes the message to the pipe if possible. If it isn't, writes
+        //  a gap notification to the pipe.
+        void write_to_pipe (class pipe_writer_t *pipe_, struct zs_msg *msg_);
+
+        //  The list of outbound pipes.
+        typedef std::vector <class pipe_writer_t*> pipes_t;
+        pipes_t pipes;
+
+        //  Current pipe to write next message to.
+        pipes_t::size_type current;
+
+        load_balancer_t (const load_balancer_t&);
+        void operator = (const load_balancer_t&);
+    };
+
+}
+
+#endif