2 Copyright (C) 2012 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 * @brief A parent class to represent long-running tasks which are run in their own thread.
25 #ifndef DCPOMATIC_JOB_H
26 #define DCPOMATIC_JOB_H
28 #include "signaller.h"
29 #include <boost/thread/mutex.hpp>
30 #include <boost/signals2.hpp>
31 #include <boost/thread.hpp>
37 * @brief A parent class to represent long-running tasks which are run in their own thread.
39 class Job : public std::enable_shared_from_this<Job>, public Signaller
42 explicit Job (std::shared_ptr<const Film> film);
45 Job (Job const&) = delete;
46 Job& operator= (Job const&) = delete;
48 /** @return user-readable name of this job */
49 virtual std::string name () const = 0;
50 virtual std::string json_name () const = 0;
51 /** Run this job in the current thread. */
52 virtual void run () = 0;
53 /** @return true if it should be possible to notify when this job finishes */
54 virtual bool enable_notify () const {
59 bool pause_by_user ();
60 void pause_by_priority ();
65 bool running () const;
66 bool finished () const;
67 bool finished_ok () const;
68 bool finished_in_error () const;
69 bool finished_cancelled () const;
70 bool paused_by_user () const;
71 bool paused_by_priority () const;
73 std::string error_summary () const;
74 std::string error_details () const;
76 boost::optional<std::string> message () const;
78 virtual std::string status () const;
79 std::string json_status () const;
80 std::string sub_name () const {
84 void set_progress_unknown ();
85 void set_progress (float, bool force = false);
86 void sub (std::string);
87 boost::optional<float> progress () const;
88 boost::optional<float> seconds_since_last_progress_update () const;
90 std::shared_ptr<const Film> film () const {
96 RESULT_ERROR, // we can't have plain ERROR on Windows
100 void when_finished(boost::signals2::connection& connection, std::function<void(Result)> finished);
102 void set_rate_limit_progress(bool rate_limit);
104 boost::signals2::signal<void()> Progress;
105 /** Emitted from the UI thread when the job is finished */
106 boost::signals2::signal<void (Result)> Finished;
107 /** Emitted from the job thread when the job is finished */
108 boost::signals2::signal<void (Result)> FinishedImmediate;
112 virtual int remaining_time () const;
114 /** Description of a job's state */
116 NEW, ///< the job hasn't been started yet
117 RUNNING, ///< the job is running
118 PAUSED_BY_USER, ///< the job has been paused
119 PAUSED_BY_PRIORITY, ///< the job has been paused
120 FINISHED_OK, ///< the job has finished successfully
121 FINISHED_ERROR, ///< the job has finished in error
122 FINISHED_CANCELLED ///< the job was cancelled
125 Result state_to_result(State state) const;
126 void set_state (State);
127 void set_error (std::string s, std::string d = "");
128 void set_message (std::string m);
129 int elapsed_sub_time () const;
130 void check_for_interruption_or_pause ();
133 std::shared_ptr<const Film> _film;
135 time_t _start_time = 0;
136 time_t _finish_time = 0;
141 void set_progress_common (boost::optional<float> p);
143 boost::thread _thread;
145 /** mutex for _state, _error*, _message */
146 mutable boost::mutex _state_mutex;
147 /** current state of the job */
149 /** summary of an error that has occurred (when state == FINISHED_ERROR) */
150 std::string _error_summary;
151 std::string _error_details;
152 /** a message that should be given to the user when the job finishes */
153 boost::optional<std::string> _message;
155 /** time that this sub-job was started */
156 time_t _sub_start_time;
157 std::string _sub_name;
159 /** mutex for _progress and _last_progress_update */
160 mutable boost::mutex _progress_mutex;
161 boost::optional<float> _progress;
162 boost::optional<struct timeval> _last_progress_update;
164 /** true to limit emissions of the progress signal so that they don't
167 boost::atomic<bool> _rate_limit_progress;
169 /** condition to signal changes to pause/resume so that we know when to wake;
170 this could be a general _state_change if it made more sense.
172 boost::condition_variable _pause_changed;