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diff --git a/src/fair_aggregator.hpp b/src/fair_aggregator.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_FAIR_AGGREGATOR_HPP_INCLUDED__
+#define __ZS_FAIR_AGGREGATOR_HPP_INCLUDED__
+
+#include <vector>
+
+#include "i_mux.hpp"
+
+namespace zs
+{
+
+    //  Object to aggregate messages from inbound pipes.
+
+    class fair_aggregator_t : public i_mux
+    {
+    public:
+
+        fair_aggregator_t ();
+
+        //  i_mux interface implementation.
+        void set_session (session_t *session_);
+        void shutdown ();
+        void terminate ();
+        void attach_pipe (class pipe_reader_t *pipe_);
+        void detach_pipe (class pipe_reader_t *pipe_);
+        bool empty ();
+        void deactivate (class pipe_reader_t *pipe_);
+        void reactivate (class pipe_reader_t *pipe_);
+        bool recv (struct zs_msg *msg_);
+
+
+    private:
+
+        //  Clean-up.
+        ~fair_aggregator_t ();
+
+        //  Reference to the owner session object.
+        class session_t *session;
+
+        //  The list of inbound pipes. The active pipes are occupying indices
+        //  from 0 to active-1. Suspended pipes occupy indices from 'active'
+        //  to the end of the array.
+        typedef std::vector <class pipe_reader_t*> pipes_t;
+        pipes_t pipes;
+
+        //  The number of active pipes.
+        pipes_t::size_type active;
+
+        //  Pipe to retrieve next message from. The messages are retrieved
+        //  from the pipes in round-robin fashion (a.k.a. fair queueing).
+        pipes_t::size_type current;
+
+        fair_aggregator_t (const fair_aggregator_t&);
+        void operator = (const fair_aggregator_t&);
+    };
+
+}
+
+#endif