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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_STREAM_ENGINE_HPP_INCLUDED__
+#define __ZMQ_STREAM_ENGINE_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "fd.hpp"
+#include "i_engine.hpp"
+#include "io_object.hpp"
+#include "encoder.hpp"
+#include "decoder.hpp"
+#include "options.hpp"
+
+namespace zmq
+{
+
+ // This engine handles any socket with SOCK_STREAM semantics,
+ // e.g. TCP socket or an UNIX domain socket.
+
+ class stream_engine_t : public io_object_t, public i_engine
+ {
+ public:
+
+ stream_engine_t (fd_t fd_, const options_t &options_);
+ ~stream_engine_t ();
+
+ // i_engine interface implementation.
+ void plug (class io_thread_t *io_thread_, class session_t *session_);
+ void unplug ();
+ void terminate ();
+ void activate_in ();
+ void activate_out ();
+
+ // i_poll_events interface implementation.
+ void in_event ();
+ void out_event ();
+
+ private:
+
+ // Function to handle network disconnections.
+ void error ();
+
+ // Writes data to the socket. Returns the number of bytes actually
+ // written (even zero is to be considered to be a success). In case
+ // of error or orderly shutdown by the other peer -1 is returned.
+ int write (const void *data_, size_t size_);
+
+ // Reads data from the socket (up to 'size' bytes). Returns the number
+ // of bytes actually read (even zero is to be considered to be
+ // a success). In case of error or orderly shutdown by the other
+ // peer -1 is returned.
+ int read (void *data_, size_t size_);
+
+ // Underlying socket.
+ fd_t s;
+
+ handle_t handle;
+
+ unsigned char *inpos;
+ size_t insize;
+ decoder_t decoder;
+
+ unsigned char *outpos;
+ size_t outsize;
+ encoder_t encoder;
+
+ // The session this engine is attached to.
+ class session_t *session;
+
+ // Detached transient session.
+ class session_t *leftover_session;
+
+ options_t options;
+
+ bool plugged;
+
+ stream_engine_t (const stream_engine_t&);
+ const stream_engine_t &operator = (const stream_engine_t&);
+ };
+
+}
+
+#endif