src/lib/job_manager.cc

   1 /*
   2     Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 /** @file  src/job_manager.cc
  21  *  @brief A simple scheduler for jobs.
  22  */
  23
  24 #include "job_manager.h"
  25 #include "job.h"
  26 #include "cross.h"
  27 #include "analyse_audio_job.h"
  28 #include "film.h"
  29 #include <boost/thread.hpp>
  30 #include <boost/foreach.hpp>
  31 #include <iostream>
  32
  33 using std::string;
  34 using std::list;
  35 using std::cout;
  36 using boost::shared_ptr;
  37 using boost::weak_ptr;
  38 using boost::function;
  39 using boost::dynamic_pointer_cast;
  40 using boost::optional;
  41
  42 JobManager* JobManager::_instance = 0;
  43
  44 JobManager::JobManager ()
  45         : _terminate (false)
  46         , _scheduler (0)
  47 {
  48
  49 }
  50
  51 void
  52 JobManager::start ()
  53 {
  54         _scheduler = new boost::thread (boost::bind (&JobManager::scheduler, this));
  55 }
  56
  57 JobManager::~JobManager ()
  58 {
  59         {
  60                 boost::mutex::scoped_lock lm (_mutex);
  61                 _terminate = true;
  62         }
  63
  64         if (_scheduler) {
  65                 _scheduler->join ();
  66         }
  67
  68         delete _scheduler;
  69 }
  70
  71 shared_ptr<Job>
  72 JobManager::add (shared_ptr<Job> j)
  73 {
  74         {
  75                 boost::mutex::scoped_lock lm (_mutex);
  76                 _jobs.push_back (j);
  77         }
  78
  79         emit (boost::bind (boost::ref (JobAdded), weak_ptr<Job> (j)));
  80
  81         return j;
  82 }
  83
  84 list<shared_ptr<Job> >
  85 JobManager::get () const
  86 {
  87         boost::mutex::scoped_lock lm (_mutex);
  88         return _jobs;
  89 }
  90
  91 bool
  92 JobManager::work_to_do () const
  93 {
  94         boost::mutex::scoped_lock lm (_mutex);
  95         list<shared_ptr<Job> >::const_iterator i = _jobs.begin();
  96         while (i != _jobs.end() && (*i)->finished()) {
  97                 ++i;
  98         }
  99
 100         return i != _jobs.end ();
 101 }
 102
 103 bool
 104 JobManager::errors () const
 105 {
 106         boost::mutex::scoped_lock lm (_mutex);
 107         for (list<shared_ptr<Job> >::const_iterator i = _jobs.begin(); i != _jobs.end(); ++i) {
 108                 if ((*i)->finished_in_error ()) {
 109                         return true;
 110                 }
 111         }
 112
 113         return false;
 114 }
 115
 116 void
 117 JobManager::scheduler ()
 118 {
 119         while (true) {
 120
 121                 optional<string> active_job;
 122
 123                 {
 124                         boost::mutex::scoped_lock lm (_mutex);
 125                         if (_terminate) {
 126                                 return;
 127                         }
 128
 129                         BOOST_FOREACH (shared_ptr<Job> i, _jobs) {
 130
 131                                 if (!i->finished ()) {
 132                                         active_job = i->json_name ();
 133                                 }
 134
 135                                 if (i->running ()) {
 136                                         /* Something is already happening */
 137                                         break;
 138                                 }
 139
 140                                 if (i->is_new()) {
 141                                         i->start ();
 142                                         /* Only start one job at once */
 143                                         break;
 144                                 }
 145                         }
 146                 }
 147
 148                 if (active_job != _last_active_job) {
 149                         _last_active_job = active_job;
 150                         emit (boost::bind (boost::ref (ActiveJobsChanged), active_job));
 151                 }
 152
 153                 dcpomatic_sleep (1);
 154         }
 155 }
 156
 157 JobManager *
 158 JobManager::instance ()
 159 {
 160         if (_instance == 0) {
 161                 _instance = new JobManager ();
 162                 _instance->start ();
 163         }
 164
 165         return _instance;
 166 }
 167
 168 void
 169 JobManager::drop ()
 170 {
 171         delete _instance;
 172         _instance = 0;
 173 }
 174
 175 void
 176 JobManager::analyse_audio (
 177         shared_ptr<const Film> film,
 178         shared_ptr<const Playlist> playlist,
 179         boost::signals2::connection& connection,
 180         function<void()> ready
 181         )
 182 {
 183         shared_ptr<AnalyseAudioJob> job;
 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 && film->audio_analysis_path (a->playlist ()) == film->audio_analysis_path (playlist)) {
 191                                 i->when_finished (connection, ready);
 192                                 return;
 193                         }
 194                 }
 195
 196                 job.reset (new AnalyseAudioJob (film, playlist));
 197                 connection = job->Finished.connect (ready);
 198                 _jobs.push_back (job);
 199         }
 200
 201         emit (boost::bind (boost::ref (JobAdded), weak_ptr<Job> (job)));
 202 }