cgit.sxemacs.org Git - harmattan/cameraplus/blob - src/cameraresources.cpp

   1 /*!
   2  * This file is part of CameraPlus.
   3  *
   4  * Copyright (C) 2012 Mohammed Sameer <msameer@foolab.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include "cameraresources.h"
  22 #include <dbusconnectioneventloop.h>
  23 #include <QDebug>
  24
  25 #define APPLICATION_CLASS "camera"
  26
  27 CameraResources::CameraResources(QObject *parent) :
  28   QObject(parent),
  29   m_worker(new CameraResourcesWorker) {
  30
  31   m_worker->moveToThread(&m_thread);
  32   DBUSConnectionEventLoop::getInstance().moveToThread(&m_thread);
  33
  34   QObject::connect(&m_thread, SIGNAL(started()), m_worker, SLOT(init()));
  35   m_thread.start();
  36
  37   qRegisterMetaType<CameraResources::Mode>("CameraResources::Mode");
  38   qRegisterMetaType<bool *>("bool *");
  39
  40   QObject::connect(m_worker, SIGNAL(acquiredChanged()), this, SIGNAL(acquiredChanged()));
  41   QObject::connect(m_worker, SIGNAL(hijackedChanged()), this, SIGNAL(hijackedChanged()));
  42   QObject::connect(m_worker, SIGNAL(updated()), this, SIGNAL(updated()));
  43   QObject::connect(m_worker, SIGNAL(acquiredChanged()), this, SIGNAL(scaleAcquisitionChanged()));
  44   QObject::connect(m_worker, SIGNAL(hijackedChanged()), this, SIGNAL(scaleAcquisitionChanged()));
  45   QObject::connect(m_worker, SIGNAL(updated()), this, SIGNAL(scaleAcquisitionChanged()));
  46 }
  47
  48 CameraResources::~CameraResources() {
  49   acquire(CameraResources::None);
  50   m_thread.exit(0);
  51
  52   while (m_thread.isRunning()) {
  53     m_thread.wait(10);
  54   }
  55
  56   delete m_worker;
  57   m_worker = 0;
  58 }
  59
  60 bool CameraResources::isResourceGranted(const ResourcePolicy::ResourceType& resource) const {
  61   bool ok = false;
  62
  63   QMetaObject::invokeMethod(m_worker, "isResourceGranted", Qt::BlockingQueuedConnection,
  64                             Q_ARG(bool *, &ok), Q_ARG(int, resource));
  65
  66   return ok;
  67 }
  68
  69 bool CameraResources::acquire(const Mode& mode) {
  70   bool ok = false;
  71
  72   QMetaObject::invokeMethod(m_worker, "acquire", Qt::BlockingQueuedConnection,
  73                             Q_ARG(bool *, &ok), Q_ARG(CameraResources::Mode, mode));
  74
  75   return ok;
  76 }
  77
  78 bool CameraResources::acquired() const {
  79   bool ok = false;
  80
  81   QMetaObject::invokeMethod(m_worker, "acquired", Qt::BlockingQueuedConnection,
  82                             Q_ARG(bool *, &ok));
  83
  84   return ok;
  85 }
  86
  87 bool CameraResources::hijacked() const {
  88   bool ok = false;
  89
  90   QMetaObject::invokeMethod(m_worker, "hijacked", Qt::BlockingQueuedConnection,
  91                             Q_ARG(bool *, &ok));
  92
  93   return ok;
  94 }
  95
  96 bool CameraResources::isScaleAcquired() const {
  97   return isResourceGranted(ResourcePolicy::ScaleButtonType);
  98 }
  99
 100 CameraResourcesWorker::CameraResourcesWorker(QObject *parent) :
 101   QObject(parent),
 102   m_set(0),
 103   m_mode(CameraResources::None),
 104   m_acquired(false),
 105   m_acquiring(false),
 106   m_hijacked(false) {
 107
 108 }
 109
 110 CameraResourcesWorker::~CameraResourcesWorker() {
 111
 112 }
 113
 114 void CameraResourcesWorker::init() {
 115   m_set = new ResourcePolicy::ResourceSet(APPLICATION_CLASS, this);
 116   m_set->setAlwaysReply();
 117
 118   QObject::connect(m_set, SIGNAL(resourcesReleased()), this, SLOT(resourcesReleased()));
 119   QObject::connect(m_set, SIGNAL(lostResources()), this, SLOT(lostResources()));
 120   QObject::connect(m_set, SIGNAL(resourcesGranted(const QList<ResourcePolicy::ResourceType>&)),
 121                    this, SLOT(resourcesGranted(const QList<ResourcePolicy::ResourceType>&)));
 122   QObject::connect(m_set, SIGNAL(resourcesDenied()), this, SLOT(resourcesDenied()));
 123
 124   if (!m_set->initAndConnect()) {
 125     qCritical() << "Failed to connect to resource policy engine";
 126   }
 127 }
 128
 129 void CameraResourcesWorker::resourcesReleased() {
 130   setHijacked(false);
 131   setAcquired(false);
 132
 133   m_acquiring = false;
 134 }
 135
 136 void CameraResourcesWorker::lostResources() {
 137   setAcquired(false);
 138   setHijacked(true);
 139
 140   m_acquiring = false;
 141 }
 142
 143 void CameraResourcesWorker::resourcesGranted(const QList<ResourcePolicy::ResourceType>& optional) {
 144   Q_UNUSED(optional);
 145
 146   if (!m_acquiring) {
 147     // This can happen when:
 148     // 1) We lose/gain optional resources.
 149     // 2) A higher priority application releases resources back.
 150     emit updated();
 151   }
 152
 153   m_acquiring = false;
 154
 155   setAcquired(true);
 156   setHijacked(false);
 157 }
 158
 159 void CameraResourcesWorker::resourcesDenied() {
 160   setAcquired(false);
 161   setHijacked(true);
 162
 163   m_acquiring = false;
 164 }
 165
 166 QList<ResourcePolicy::ResourceType> CameraResourcesWorker::listSet() {
 167   QList<ResourcePolicy::Resource *> resources = m_set->resources();
 168
 169   QList<ResourcePolicy::ResourceType> set;
 170
 171   foreach (ResourcePolicy::Resource *r, resources) {
 172     set << r->type();
 173   }
 174
 175   return set;
 176 }
 177
 178 void CameraResourcesWorker::acquire(bool *ok, const CameraResources::Mode& mode) {
 179   if (mode == m_mode) {
 180     *ok = true;
 181     return;
 182   }
 183
 184   m_mode = mode;
 185
 186   *ok = false;
 187
 188   switch (m_mode) {
 189   case CameraResources::None:
 190     *ok = release();
 191     break;
 192
 193   case CameraResources::Image:
 194     *ok = updateSet(QList<ResourcePolicy::ResourceType>()
 195                     << ResourcePolicy::VideoPlaybackType
 196                     << ResourcePolicy::VideoRecorderType,
 197                     QList<ResourcePolicy::ResourceType>()
 198                     << ResourcePolicy::ScaleButtonType);
 199     break;
 200
 201   case CameraResources::Video:
 202     *ok = updateSet(QList<ResourcePolicy::ResourceType>()
 203                     << ResourcePolicy::VideoPlaybackType
 204                     << ResourcePolicy::VideoRecorderType,
 205                     QList<ResourcePolicy::ResourceType>()
 206                     << ResourcePolicy::ScaleButtonType);
 207     break;
 208
 209   case CameraResources::Recording:
 210     *ok = updateSet(QList<ResourcePolicy::ResourceType>()
 211                     << ResourcePolicy::VideoPlaybackType
 212                     << ResourcePolicy::VideoRecorderType,
 213                     QList<ResourcePolicy::ResourceType>()
 214                     << ResourcePolicy::ScaleButtonType
 215                     << ResourcePolicy::AudioRecorderType
 216                     << ResourcePolicy::AudioPlaybackType);
 217     break;
 218
 219   case CameraResources::PostCapture:
 220     *ok = updateSet(QList<ResourcePolicy::ResourceType>(),
 221                     QList<ResourcePolicy::ResourceType>()
 222                     << ResourcePolicy::ScaleButtonType);
 223     break;
 224
 225   default:
 226     qWarning() << "Unknown mode" << mode;
 227
 228     *ok = false;
 229   }
 230 }
 231
 232 void CameraResourcesWorker::acquired(bool *ok) {
 233   *ok = m_acquired;
 234 }
 235
 236 void CameraResourcesWorker::hijacked(bool *ok) {
 237   *ok = m_hijacked;
 238 }
 239
 240 bool CameraResourcesWorker::updateSet(const QList<ResourcePolicy::ResourceType>& required,
 241                                       const QList<ResourcePolicy::ResourceType>& optional) {
 242
 243
 244   QList<ResourcePolicy::ResourceType> set = listSet();
 245
 246   foreach (ResourcePolicy::ResourceType r, set) {
 247     if (required.indexOf(r) != -1) {
 248       m_set->resource(r)->setOptional(false);
 249     }
 250     else if (optional.indexOf(r) != -1) {
 251       m_set->resource(r)->setOptional(true);
 252     }
 253     else {
 254       m_set->deleteResource(r);
 255     }
 256   }
 257
 258   foreach (ResourcePolicy::ResourceType r, required) {
 259     m_set->addResource(r);
 260   }
 261
 262   foreach (ResourcePolicy::ResourceType r, optional) {
 263     m_set->addResource(r);
 264     ResourcePolicy::Resource *res = m_set->resource(r);
 265     if (res) {
 266       res->setOptional(true);
 267     }
 268   }
 269
 270   if (m_set->contains(ResourcePolicy::AudioPlaybackType)) {
 271     bool isOptional = m_set->resource(ResourcePolicy::AudioPlaybackType)->isOptional();
 272
 273     ResourcePolicy::AudioResource *audio = new ResourcePolicy::AudioResource(APPLICATION_CLASS);
 274     audio->setProcessID(QCoreApplication::applicationPid());
 275     audio->setOptional(isOptional);
 276     m_set->addResourceObject(audio);
 277   }
 278
 279   m_acquiring = true;
 280
 281   m_set->update();
 282   m_set->acquire();
 283
 284   while (m_acquiring) {
 285     QCoreApplication::processEvents(QEventLoop::WaitForMoreEvents);
 286   }
 287
 288   return m_acquired;
 289 }
 290
 291 bool CameraResourcesWorker::release() {
 292   m_acquiring = true;
 293
 294   m_set->release();
 295
 296   while (m_acquiring) {
 297     QCoreApplication::processEvents(QEventLoop::WaitForMoreEvents);
 298   }
 299
 300   m_mode = CameraResources::None;
 301
 302   return true;
 303 }
 304
 305 void CameraResourcesWorker::setAcquired(bool acquired) {
 306   if (m_acquired != acquired) {
 307     m_acquired = acquired;
 308     emit acquiredChanged();
 309   }
 310 }
 311
 312 void CameraResourcesWorker::setHijacked(bool hijacked) {
 313   if (m_hijacked != hijacked) {
 314     m_hijacked = hijacked;
 315     emit hijackedChanged();
 316   }
 317 }
 318
 319 void CameraResourcesWorker::isResourceGranted(bool *ok, int resource) {
 320
 321   ResourcePolicy::ResourceType rt = (ResourcePolicy::ResourceType)resource;
 322
 323   ResourcePolicy::Resource *r = m_set->resource(rt);
 324   if (r) {
 325     *ok = r->isGranted();
 326   }
 327 }