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diff --git a/src/session.hpp b/src/session.hpp
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+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    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 __ZMQ_SESSION_HPP_INCLUDED__
+#define __ZMQ_SESSION_HPP_INCLUDED__
+
+#include "i_inout.hpp"
+#include "i_endpoint.hpp"
+#include "owned.hpp"
+#include "options.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+
+    class session_t : public owned_t, public i_inout, public i_endpoint
+    {
+    public:
+
+        //  Creates unnamed session.
+        session_t (object_t *parent_, socket_base_t *owner_,
+            const options_t &options_);
+
+        //  Creates named session.
+        session_t (object_t *parent_, socket_base_t *owner_,
+            const options_t &options_, const blob_t &peer_identity_);
+
+        //  i_inout interface implementation.
+        bool read (::zmq_msg_t *msg_);
+        bool write (::zmq_msg_t *msg_);
+        void flush ();
+        void detach (owned_t *reconnecter_);
+        class io_thread_t *get_io_thread ();
+        class socket_base_t *get_owner ();
+        uint64_t get_ordinal ();
+
+        //  i_endpoint interface implementation.
+        void attach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
+            const blob_t &peer_identity_);
+        void detach_inpipe (class reader_t *pipe_);
+        void detach_outpipe (class writer_t *pipe_);
+        void kill (class reader_t *pipe_);
+        void revive (class reader_t *pipe_);
+        void revive (class writer_t *pipe_);
+
+    private:
+
+        ~session_t ();
+
+        //  Handlers for incoming commands.
+        void process_plug ();
+        void process_unplug ();
+        void process_attach (struct i_engine *engine_,
+            const blob_t &peer_identity_);
+
+        //  Inbound pipe, i.e. one the session is getting messages from.
+        class reader_t *in_pipe;
+
+        //  This flag is true if the remainder of the message being processed
+        //  is still in the in pipe.
+        bool incomplete_in;
+
+        //  If true, in_pipe is active. Otherwise there are no messages to get.
+        bool active;
+
+        //  Outbound pipe, i.e. one the socket is sending messages to.
+        class writer_t *out_pipe;
+
+        struct i_engine *engine;
+
+        //  Session is identified by ordinal in the case when it was created
+        //  before connection to the peer was established and thus we are
+        //  unaware of peer's identity.
+        uint64_t ordinal;
+
+        //  Identity of the peer.
+        blob_t peer_identity;
+
+        //  Inherited socket options.
+        options_t options;
+
+        session_t (const session_t&);
+        void operator = (const session_t&);
+    };
+
+}
+
+#endif