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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_I_ENGINE_HPP_INCLUDED__
#define __ZMQ_I_ENGINE_HPP_INCLUDED__
namespace zmq
{
// Abstract interface to be implemented by various engines.
struct i_engine
{
virtual ~i_engine () {}
// Plug the engine to the session.
virtual void plug (class io_thread_t *io_thread_,
struct i_engine_sink *sink_) = 0;
// Unplug the engine from the session.
virtual void unplug () = 0;
// Terminate and deallocate the engine. Note that 'detached'
// events are not fired on termination.
virtual void terminate () = 0;
// This method is called by the session to signalise that more
// messages can be written to the pipe.
virtual void activate_in () = 0;
// This method is called by the session to signalise that there
// are messages to send available.
virtual void activate_out () = 0;
};
// Abstract interface to be implemented by engine sinks such as sessions.
struct i_engine_sink
{
virtual ~i_engine_sink () {}
// Engine asks for a message to send to the network.
virtual bool read (class msg_t *msg_) = 0;
// Engine received message from the network and sends it further on.
virtual bool write (class msg_t *msg_) = 0;
// Flush all the previously written messages.
virtual void flush () = 0;
// Engine is dead. Drop all the references to it.
virtual void detach () = 0;
};
}
#endif
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