2 Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 /** @file src/lib/encode_server_finder.h
23 * @brief EncodeServerFinder class.
28 #include "encode_server_description.h"
29 #include "exception_store.h"
30 #include "signaller.h"
31 #include <boost/signals2.hpp>
32 #include <boost/thread/condition.hpp>
38 /** @class EncodeServerFinder
39 * @brief Locater of encoding servers.
41 * This class finds active (i.e. responding) encode servers. Depending on
42 * configuration it finds servers by:
44 * 1. broadcasting a request to the local subnet and
45 * 2. checking to see if any of the configured server hosts are up.
47 class EncodeServerFinder : public Signaller, public ExceptionStore
50 static EncodeServerFinder* instance ();
55 std::list<EncodeServerDescription> servers () const;
57 /** Emitted whenever the list of servers changes */
58 boost::signals2::signal<void ()> ServersListChanged;
61 EncodeServerFinder ();
62 ~EncodeServerFinder ();
66 void search_thread ();
67 void listen_thread ();
69 boost::optional<std::list<EncodeServerDescription>::iterator> server_found (std::string);
71 void handle_accept (boost::system::error_code ec, std::shared_ptr<Socket> socket);
73 void config_changed (Config::Property what);
75 /** Thread to periodically issue broadcasts and requests to find encoding servers */
76 boost::thread _search_thread;
77 /** Thread to listen to the responses from servers */
78 boost::thread _listen_thread;
80 /** Available servers */
81 std::list<EncodeServerDescription> _servers;
82 /** Mutex for _servers */
83 mutable boost::mutex _servers_mutex;
85 boost::asio::io_service _listen_io_service;
86 std::shared_ptr<boost::asio::ip::tcp::acceptor> _listen_acceptor;
89 boost::condition _search_condition;
90 boost::mutex _search_condition_mutex;
92 static EncodeServerFinder* _instance;