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+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser 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
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_ROUTER_HPP_INCLUDED__
+#define __ZMQ_ROUTER_HPP_INCLUDED__
+
+#include <map>
+#include <vector>
+
+#include "socket_base.hpp"
+#include "blob.hpp"
+#include "msg.hpp"
+
+namespace zmq
+{
+
+    //  TODO: This class uses O(n) scheduling. Rewrite it to use O(1) algorithm.
+    class router_t :
+        public socket_base_t
+    {
+    public:
+
+        router_t (class ctx_t *parent_, uint32_t tid_);
+        ~router_t ();
+
+        //  Overloads of functions from socket_base_t.
+        void xattach_pipe (class pipe_t *pipe_, const blob_t &peer_identity_);
+        int xsend (class msg_t *msg_, int flags_);
+        int xrecv (class msg_t *msg_, int flags_);
+        bool xhas_in ();
+        bool xhas_out ();
+        void xread_activated (class pipe_t *pipe_);
+        void xwrite_activated (class pipe_t *pipe_);
+        void xterminated (class pipe_t *pipe_);
+
+    protected:
+
+        //  Rollback any message parts that were sent but not yet flushed.
+        int rollback ();
+
+    private:
+
+        struct inpipe_t
+        {
+            class pipe_t *pipe;
+            blob_t identity;
+            bool active;
+        };
+
+        //  Inbound pipes with the names of corresponging peers.
+        typedef std::vector <inpipe_t> inpipes_t;
+        inpipes_t inpipes;
+
+        //  The pipe we are currently reading from.
+        inpipes_t::size_type current_in;
+
+        //  Have we prefetched a message.
+        bool prefetched;
+
+        //  Holds the prefetched message.
+        msg_t prefetched_msg;
+
+        //  If true, more incoming message parts are expected.
+        bool more_in;
+
+        struct outpipe_t
+        {
+            class pipe_t *pipe;
+            bool active;
+        };
+
+        //  Outbound pipes indexed by the peer names.
+        typedef std::map <blob_t, outpipe_t> outpipes_t;
+        outpipes_t outpipes;
+
+        //  The pipe we are currently writing to.
+        class pipe_t *current_out;
+
+        //  If true, more outgoing message parts are expected.
+        bool more_out;
+
+        router_t (const router_t&);
+        const router_t &operator = (const router_t&);
+    };
+
+}
+
+#endif