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                 DCPOMATIC_ASSERT (_scheduler->joinable ());
  66                 _scheduler->join ();
  67         }
  68
  69         delete _scheduler;
  70 }
  71
  72 shared_ptr<Job>
  73 JobManager::add (shared_ptr<Job> j)
  74 {
  75         {
  76                 boost::mutex::scoped_lock lm (_mutex);
  77                 _jobs.push_back (j);
  78         }
  79
  80         emit (boost::bind (boost::ref (JobAdded), weak_ptr<Job> (j)));
  81
  82         return j;
  83 }
  84
  85 list<shared_ptr<Job> >
  86 JobManager::get () const
  87 {
  88         boost::mutex::scoped_lock lm (_mutex);
  89         return _jobs;
  90 }
  91
  92 bool
  93 JobManager::work_to_do () const
  94 {
  95         boost::mutex::scoped_lock lm (_mutex);
  96         list<shared_ptr<Job> >::const_iterator i = _jobs.begin();
  97         while (i != _jobs.end() && (*i)->finished()) {
  98                 ++i;
  99         }
 100
 101         return i != _jobs.end ();
 102 }
 103
 104 bool
 105 JobManager::errors () const
 106 {
 107         boost::mutex::scoped_lock lm (_mutex);
 108         for (list<shared_ptr<Job> >::const_iterator i = _jobs.begin(); i != _jobs.end(); ++i) {
 109                 if ((*i)->finished_in_error ()) {
 110                         return true;
 111                 }
 112         }
 113
 114         return false;
 115 }
 116
 117 void
 118 JobManager::scheduler ()
 119 {
 120         while (true) {
 121
 122                 optional<string> active_job;
 123
 124                 {
 125                         boost::mutex::scoped_lock lm (_mutex);
 126                         if (_terminate) {
 127                                 return;
 128                         }
 129
 130                         BOOST_FOREACH (shared_ptr<Job> i, _jobs) {
 131
 132                                 if (!i->finished ()) {
 133                                         active_job = i->json_name ();
 134                                 }
 135
 136                                 if (i->running ()) {
 137                                         /* Something is already happening */
 138                                         break;
 139                                 }
 140
 141                                 if (i->is_new()) {
 142                                         i->start ();
 143                                         /* Only start one job at once */
 144                                         break;
 145                                 }
 146                         }
 147                 }
 148
 149                 if (active_job != _last_active_job) {
 150                         emit (boost::bind (boost::ref (ActiveJobsChanged), _last_active_job, active_job));
 151                         _last_active_job = active_job;
 152                 }
 153
 154                 dcpomatic_sleep (1);
 155         }
 156 }
 157
 158 JobManager *
 159 JobManager::instance ()
 160 {
 161         if (_instance == 0) {
 162                 _instance = new JobManager ();
 163                 _instance->start ();
 164         }
 165
 166         return _instance;
 167 }
 168
 169 void
 170 JobManager::drop ()
 171 {
 172         delete _instance;
 173         _instance = 0;
 174 }
 175
 176 void
 177 JobManager::analyse_audio (
 178         shared_ptr<const Film> film,
 179         shared_ptr<const Playlist> playlist,
 180         boost::signals2::connection& connection,
 181         function<void()> ready
 182         )
 183 {
 184         {
 185                 boost::mutex::scoped_lock lm (_mutex);
 186
 187                 BOOST_FOREACH (shared_ptr<Job> i, _jobs) {
 188                         shared_ptr<AnalyseAudioJob> a = dynamic_pointer_cast<AnalyseAudioJob> (i);
 189                         if (a && a->playlist () == playlist) {
 190                                 i->when_finished (connection, ready);
 191                                 return;
 192                         }
 193                 }
 194         }
 195
 196         shared_ptr<AnalyseAudioJob> job;
 197
 198         {
 199                 boost::mutex::scoped_lock lm (_mutex);
 200
 201                 job.reset (new AnalyseAudioJob (film, playlist));
 202                 connection = job->Finished.connect (ready);
 203                 _jobs.push_back (job);
 204         }
 205
 206         emit (boost::bind (boost::ref (JobAdded), weak_ptr<Job> (job)));
 207 }