src/lib/job_manager.cc

   1 /*
   2     Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   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.
  10
  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.
  15
  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/>.
  18
  19 */
  20
  21 /** @file  src/job_manager.cc
  22  *  @brief A simple scheduler for jobs.
  23  */
  24
  25 #include "job_manager.h"
  26 #include "job.h"
  27 #include "cross.h"
  28 #include "analyse_audio_job.h"
  29 #include "film.h"
  30 #include <boost/thread.hpp>
  31 #include <boost/foreach.hpp>
  32 #include <iostream>
  33
  34 using std::string;
  35 using std::list;
  36 using std::cout;
  37 using boost::shared_ptr;
  38 using boost::weak_ptr;
  39 using boost::function;
  40 using boost::dynamic_pointer_cast;
  41 using boost::optional;
  42
  43 JobManager* JobManager::_instance = 0;
  44
  45 JobManager::JobManager ()
  46         : _terminate (false)
  47         , _scheduler (0)
  48 {
  49
  50 }
  51
  52 void
  53 JobManager::start ()
  54 {
  55         _scheduler = new boost::thread (boost::bind (&JobManager::scheduler, this));
  56 }
  57
  58 JobManager::~JobManager ()
  59 {
  60         {
  61                 boost::mutex::scoped_lock lm (_mutex);
  62                 _terminate = true;
  63         }
  64
  65         if (_scheduler) {
  66                 DCPOMATIC_ASSERT (_scheduler->joinable ());
  67                 _scheduler->join ();
  68         }
  69
  70         delete _scheduler;
  71 }
  72
  73 shared_ptr<Job>
  74 JobManager::add (shared_ptr<Job> j)
  75 {
  76         {
  77                 boost::mutex::scoped_lock lm (_mutex);
  78                 _jobs.push_back (j);
  79         }
  80
  81         emit (boost::bind (boost::ref (JobAdded), weak_ptr<Job> (j)));
  82
  83         return j;
  84 }
  85
  86 list<shared_ptr<Job> >
  87 JobManager::get () const
  88 {
  89         boost::mutex::scoped_lock lm (_mutex);
  90         return _jobs;
  91 }
  92
  93 bool
  94 JobManager::work_to_do () const
  95 {
  96         boost::mutex::scoped_lock lm (_mutex);
  97         list<shared_ptr<Job> >::const_iterator i = _jobs.begin();
  98         while (i != _jobs.end() && (*i)->finished()) {
  99                 ++i;
 100         }
 101
 102         return i != _jobs.end ();
 103 }
 104
 105 bool
 106 JobManager::errors () const
 107 {
 108         boost::mutex::scoped_lock lm (_mutex);
 109         for (list<shared_ptr<Job> >::const_iterator i = _jobs.begin(); i != _jobs.end(); ++i) {
 110                 if ((*i)->finished_in_error ()) {
 111                         return true;
 112                 }
 113         }
 114
 115         return false;
 116 }
 117
 118 void
 119 JobManager::scheduler ()
 120 {
 121         while (true) {
 122
 123                 optional<string> active_job;
 124
 125                 {
 126                         boost::mutex::scoped_lock lm (_mutex);
 127                         if (_terminate) {
 128                                 return;
 129                         }
 130
 131                         BOOST_FOREACH (shared_ptr<Job> i, _jobs) {
 132
 133                                 if (!i->finished ()) {
 134                                         active_job = i->json_name ();
 135                                 }
 136
 137                                 if (i->running ()) {
 138                                         /* Something is already happening */
 139                                         break;
 140                                 }
 141
 142                                 if (i->is_new()) {
 143                                         i->start ();
 144                                         /* Only start one job at once */
 145                                         break;
 146                                 }
 147                         }
 148                 }
 149
 150                 if (active_job != _last_active_job) {
 151                         emit (boost::bind (boost::ref (ActiveJobsChanged), _last_active_job, active_job));
 152                         _last_active_job = active_job;
 153                 }
 154
 155                 dcpomatic_sleep (1);
 156         }
 157 }
 158
 159 JobManager *
 160 JobManager::instance ()
 161 {
 162         if (_instance == 0) {
 163                 _instance = new JobManager ();
 164                 _instance->start ();
 165         }
 166
 167         return _instance;
 168 }
 169
 170 void
 171 JobManager::drop ()
 172 {
 173         delete _instance;
 174         _instance = 0;
 175 }
 176
 177 void
 178 JobManager::analyse_audio (
 179         shared_ptr<const Film> film,
 180         shared_ptr<const Playlist> playlist,
 181         boost::signals2::connection& connection,
 182         function<void()> ready
 183         )
 184 {
 185         {
 186                 boost::mutex::scoped_lock lm (_mutex);
 187
 188                 BOOST_FOREACH (shared_ptr<Job> i, _jobs) {
 189                         shared_ptr<AnalyseAudioJob> a = dynamic_pointer_cast<AnalyseAudioJob> (i);
 190                         if (a && a->playlist () == playlist) {
 191                                 i->when_finished (connection, ready);
 192                                 return;
 193                         }
 194                 }
 195         }
 196
 197         shared_ptr<AnalyseAudioJob> job;
 198
 199         {
 200                 boost::mutex::scoped_lock lm (_mutex);
 201
 202                 job.reset (new AnalyseAudioJob (film, playlist));
 203                 connection = job->Finished.connect (ready);
 204                 _jobs.push_back (job);
 205         }
 206
 207         emit (boost::bind (boost::ref (JobAdded), weak_ptr<Job> (job)));
 208 }