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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 __ZMQ_I_ENGINE_HPP_INCLUDED__
+#define __ZMQ_I_ENGINE_HPP_INCLUDED__
+
+namespace zmq
+{
+
+ struct i_engine
+ {
+ virtual ~i_engine () {}
+
+ // Plug the engine to the session.
+ virtual void plug (struct i_inout *inout_) = 0;
+
+ // Unplug the engine from the session.
+ virtual void unplug () = 0;
+
+ // This method is called by the session to signalise that there
+ // are messages to send available.
+ virtual void revive () = 0;
+ };
+
+}
+
+#endif