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+/*
+ Copyright (c) 2012 Martin Lucina <martin@lucina.net>
+
+ This file is part of Crossroads I/O.
+
+ Crossroads I/O 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.
+
+ Crossroads I/O 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 __XS_UDP_SENDER_HPP_INCLUDED__
+#define __XS_UDP_SENDER_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#include "stdint.hpp"
+#include "io_object.hpp"
+#include "i_engine.hpp"
+#include "options.hpp"
+#include "address.hpp"
+#include "encoder.hpp"
+
+namespace xs
+{
+
+ class io_thread_t;
+ class session_base_t;
+
+ class udp_sender_t : public io_object_t, public i_engine
+ {
+
+ public:
+
+ udp_sender_t (xs::io_thread_t *parent_, const options_t &options_);
+ ~udp_sender_t ();
+
+ int init (const char *address_);
+
+ // i_engine interface implementation.
+ void plug (xs::io_thread_t *io_thread_,
+ xs::session_base_t *session_);
+ void unplug ();
+ void terminate ();
+ void activate_in ();
+ void activate_out ();
+
+ // i_poll_events interface implementation.
+ void in_event (fd_t fd_);
+ void out_event (fd_t fd_);
+ void timer_event (handle_t handle_);
+
+ private:
+
+ // Underlying UDP socket.
+ fd_t socket;
+ handle_t socket_handle;
+
+ // Socket address.
+ address_t address;
+
+ // Socket options.
+ options_t options;
+
+ // Encoder for this socket.
+ encoder_t encoder;
+
+ // Associated session.
+ xs::session_base_t *session;
+
+ // UDP packet header size.
+ static const size_t udp_header_size = 6;
+
+ // Packet buffer for outgoing packets.
+ unsigned char data [pgm_max_tpdu];
+
+ // Sequence number for outgoing packets.
+ uint32_t seq_no;
+
+ // Backoff timer if receiver is not present.
+ handle_t backoff_timer;
+
+ udp_sender_t (const udp_sender_t&);
+ const udp_sender_t &operator = (const udp_sender_t&);
+ };
+
+}
+
+#endif