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/***************************************************************************
* Copyright (C) 2014 by Frank Reininghaus <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#include "mountpointobservercache.h"
#include "mountpointobserver.h"
#include <KMountPoint>
#include <QTimer>
class MountPointObserverCacheSingleton
{
public:
MountPointObserverCache instance;
};
Q_GLOBAL_STATIC(MountPointObserverCacheSingleton, s_MountPointObserverCache)
MountPointObserverCache::MountPointObserverCache() :
m_observerForMountPoint(),
m_mountPointForObserver(),
m_updateTimer(nullptr)
{
m_updateTimer = new QTimer(this);
}
MountPointObserverCache::~MountPointObserverCache()
{
}
MountPointObserverCache* MountPointObserverCache::instance()
{
return &s_MountPointObserverCache->instance;
}
MountPointObserver* MountPointObserverCache::observerForUrl(const QUrl& url)
{
QUrl cachedObserverUrl;
// If the url is a local path we can extract the root dir by checking the mount points.
if (url.isLocalFile()) {
// Try to share the observer with other paths that have the same mount point.
KMountPoint::Ptr mountPoint = KMountPoint::currentMountPoints().findByPath(url.toLocalFile());
if (mountPoint) {
cachedObserverUrl = QUrl::fromLocalFile(mountPoint->mountPoint());
} else {
// Even if determining the mount point failed, the observer might still
// be able to retrieve information about the url.
cachedObserverUrl = url;
}
} else {
cachedObserverUrl = url;
}
MountPointObserver* observer = m_observerForMountPoint.value(cachedObserverUrl);
if (!observer) {
observer = new MountPointObserver(cachedObserverUrl, this);
m_observerForMountPoint.insert(cachedObserverUrl, observer);
m_mountPointForObserver.insert(observer, cachedObserverUrl);
Q_ASSERT(m_observerForMountPoint.count() == m_mountPointForObserver.count());
connect(observer, &MountPointObserver::destroyed, this, &MountPointObserverCache::slotObserverDestroyed);
if (!m_updateTimer->isActive()) {
m_updateTimer->start(60000); // 1 minute
}
connect(m_updateTimer, &QTimer::timeout, observer, &MountPointObserver::update);
}
return observer;
}
void MountPointObserverCache::slotObserverDestroyed(QObject* observer)
{
Q_ASSERT(m_mountPointForObserver.contains(observer));
const QUrl& url = m_mountPointForObserver.value(observer);
Q_ASSERT(m_observerForMountPoint.contains(url));
m_observerForMountPoint.remove(url);
m_mountPointForObserver.remove(observer);
Q_ASSERT(m_observerForMountPoint.count() == m_mountPointForObserver.count());
if (m_mountPointForObserver.isEmpty()) {
m_updateTimer->stop();
}
}
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