create a single timer for storage event compression

datacontainer.cpp

@@ -31,6 +31,8 @@ DataContainer::DataContainer(QObject *parent)
     : QObject(parent),
       d(new DataContainerPrivate(this))
 {
+    d->storageTimer = new QTimer(this);
+    QObject::connect(d->storageTimer, SIGNAL(timeOut()), this, SLOT(store()));
 }
 
 DataContainer::~DataContainer()
@@ -59,7 +61,7 @@ void DataContainer::setData(const QString &key, const QVariant &value)
     //setData() since the last time it was stored. This
     //gives us only one singleShot timer.
     if (isStorageEnabled() || !needsToBeStored()) {
-        QTimer::singleShot(180000, this, SLOT(store()));
+        d->storageTimer->start(180000);
     }
 
     setNeedsToBeStored(true);

private/datacontainer_p.h

@@ -25,6 +25,8 @@
 #include "servicejob.h"
 #include "storage_p.h"
 
+class QTimer;
+
 namespace Plasma
 {
 class ServiceJob;
@@ -41,7 +43,8 @@ public:
           enableStorage(false),
           isStored(true),
           storageCount(0)
-    {}
+    {
+    }
 
     SignalRelay *signalRelay(const DataContainer *dc, QObject *visualization,
                              uint pollingInterval, Plasma::IntervalAlignment align,
@@ -68,6 +71,7 @@ public:
     DataEngine::Data data;
     QMap<QObject *, SignalRelay *> relayObjects;
     QMap<uint, SignalRelay *> relays;
+    QTimer *storageTimer;
     QTime updateTs;
     Storage* storage;
     bool dirty : 1;