1 files changed, 99 insertions, 0 deletions
diff --git a/src/statusbar/mountpointobservercache.cpp b/src/statusbar/mountpointobservercache.cpp
new file mode 100644
index 000000000..aff0c8e2f
--- /dev/null
+++ b/src/statusbar/mountpointobservercache.cpp
@@ -0,0 +1,99 @@
+/***************************************************************************
+ *   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 <KGlobal>
+#include <KMountPoint>
+
+#include <QTimer>
+
+class MountPointObserverCacheSingleton
+{
+public:
+    MountPointObserverCache instance;
+};
+K_GLOBAL_STATIC(MountPointObserverCacheSingleton, s_MountPointObserverCache)
+
+
+MountPointObserverCache::MountPointObserverCache() :
+    m_observerForMountPoint(),
+    m_mountPointForObserver(),
+    m_updateTimer(0)
+{
+    m_updateTimer = new QTimer(this);
+}
+
+MountPointObserverCache::~MountPointObserverCache()
+{
+}
+
+MountPointObserverCache* MountPointObserverCache::instance()
+{
+    return &s_MountPointObserverCache->instance;
+}
+
+MountPointObserver* MountPointObserverCache::observerForPath(const QString& path)
+{
+    // Try to share the observer with other paths that have the same mount point.
+    QString mountPointPath;
+    KMountPoint::Ptr mountPoint = KMountPoint::currentMountPoints().findByPath(path);
+    if (mountPoint) {
+        mountPointPath = mountPoint->mountPoint();
+    } else {
+        // Even if determining the mount point failed, KDiskFreeSpaceInfo might still
+        // be able to retrieve information about the path.
+        mountPointPath = path;
+    }
+
+    MountPointObserver* observer = m_observerForMountPoint.value(mountPointPath);
+    if (!observer) {
+        observer = new MountPointObserver(mountPointPath, this);
+        m_observerForMountPoint.insert(mountPointPath, observer);
+        m_mountPointForObserver.insert(observer, mountPointPath);
+        Q_ASSERT(m_observerForMountPoint.count() == m_mountPointForObserver.count());
+
+        connect(observer, SIGNAL(destroyed(QObject*)), this, SLOT(slotObserverDestroyed(QObject*)));
+
+        if (!m_updateTimer->isActive()) {
+            m_updateTimer->start(10000);
+        }
+
+        connect(m_updateTimer, SIGNAL(timeout()), observer, SLOT(update()));
+    }
+
+    return observer;
+}
+
+void MountPointObserverCache::slotObserverDestroyed(QObject* observer)
+{
+    Q_ASSERT(m_mountPointForObserver.contains(observer));
+    const QString& path = m_mountPointForObserver.value(observer);
+    Q_ASSERT(m_observerForMountPoint.contains(path));
+    m_observerForMountPoint.remove(path);
+    m_mountPointForObserver.remove(observer);
+
+    Q_ASSERT(m_observerForMountPoint.count() == m_mountPointForObserver.count());
+
+    if (m_mountPointForObserver.isEmpty()) {
+        m_updateTimer->stop();
+    }
+}