src/views/versioncontrol/updateitemstatesthread.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Peter Penz <peter.penz19@gmail.com>             *
   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                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "updateitemstatesthread.h"
  21
  22 #include <QMutexLocker>
  23
  24 UpdateItemStatesThread::UpdateItemStatesThread() :
  25     QThread(),
  26     m_globalPluginMutex(0),
  27     m_plugin(0),
  28     m_itemMutex(),
  29     m_retrievedItems(false),
  30     m_itemStates()
  31 {
  32     // Several threads may share one instance of a plugin. A global
  33     // mutex is required to serialize the retrieval of version control
  34     // states inside run().
  35     static QMutex globalMutex;
  36     m_globalPluginMutex = &globalMutex;
  37 }
  38
  39 UpdateItemStatesThread::~UpdateItemStatesThread()
  40 {
  41 }
  42
  43 void UpdateItemStatesThread::setData(KVersionControlPlugin* plugin,
  44                                      const QList<VersionControlObserver::ItemState>& itemStates)
  45 {
  46     QMutexLocker itemLocker(&m_itemMutex);
  47     m_itemStates = itemStates;
  48
  49     QMutexLocker pluginLocker(m_globalPluginMutex);
  50     m_plugin = plugin;
  51 }
  52
  53 void UpdateItemStatesThread::run()
  54 {
  55     Q_ASSERT(!m_itemStates.isEmpty());
  56     Q_ASSERT(m_plugin);
  57
  58     QMutexLocker itemLocker(&m_itemMutex);
  59     const QString directory = m_itemStates.first().item.url().directory(KUrl::AppendTrailingSlash);
  60     itemLocker.unlock();
  61
  62     QMutexLocker pluginLocker(m_globalPluginMutex);
  63     m_retrievedItems = false;
  64     if (m_plugin->beginRetrieval(directory)) {
  65         itemLocker.relock();
  66         const int count = m_itemStates.count();
  67         for (int i = 0; i < count; ++i) {
  68             m_itemStates[i].version = m_plugin->versionState(m_itemStates[i].item);
  69         }
  70         m_plugin->endRetrieval();
  71         m_retrievedItems = true;
  72     }
  73 }
  74
  75 bool UpdateItemStatesThread::lockPlugin()
  76 {
  77     return m_globalPluginMutex->tryLock(300);
  78 }
  79
  80 void UpdateItemStatesThread::unlockPlugin()
  81 {
  82     m_globalPluginMutex->unlock();
  83 }
  84
  85 QList<VersionControlObserver::ItemState> UpdateItemStatesThread::itemStates() const
  86 {
  87     QMutexLocker locker(&m_itemMutex);
  88     return m_itemStates;
  89 }
  90
  91 bool UpdateItemStatesThread::retrievedItems() const
  92 {
  93     QMutexLocker locker(&m_itemMutex);
  94     return m_retrievedItems;
  95 }
  96
  97 #include "updateitemstatesthread.moc"