Test that the mapping manager engine pointer is still valid.

QPointer holds a guarded pointer to a QObject. It must always be tested
prior to use.

Changed the parameter type to remove the need for the static_cast when
setting the QPointer member.

The root cause was that the tile fetcher object was not being destroyed
when the mapping manager engine was. Which was because the two objects
were in different threads. Some of the service specific tile fetchers
were directly calling into the engine objects across thread. Gah.

Since Qt 5 QNAM uses an application global thread for processing
requests, there is no need to use threads in the tile fetcher.

Change-Id: Id9df35ddfa78df2cbf334006fe5fc9726a75f92d
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>

5 files changed, 11 insertions, 66 deletions

diff --git a/src/location/maps/qgeotiledmappingmanagerengine.cpp b/src/location/maps/qgeotiledmappingmanagerengine.cpp
index c0382b1a..69532f44 100644
--- a/src/location/maps/qgeotiledmappingmanagerengine.cpp
+++ b/src/location/maps/qgeotiledmappingmanagerengine.cpp
@@ -74,9 +74,6 @@ void QGeoTiledMappingManagerEngine::setTileFetcher(QGeoTileFetcher *fetcher)
     Q_D(QGeoTiledMappingManagerEngine);
 
     d->fetcher_ = fetcher;
-    d->fetcher_->init();
-
-    d->thread_ = new QThread;
 
     qRegisterMetaType<QGeoTileSpec>();
 
@@ -91,26 +88,7 @@ void QGeoTiledMappingManagerEngine::setTileFetcher(QGeoTileFetcher *fetcher)
             SLOT(engineTileError(QGeoTileSpec,QString)),
             Qt::QueuedConnection);
 
-    d->fetcher_->moveToThread(d_ptr->thread_);
-
-    connect(d->thread_,
-            SIGNAL(started()),
-            d->fetcher_,
-            SLOT(threadStarted()));
-
-    connect(d->thread_,
-            SIGNAL(finished()),
-            d->fetcher_,
-            SLOT(threadFinished()));
-
-    connect(d->fetcher_,
-            SIGNAL(destroyed()),
-            d->thread_,
-            SLOT(deleteLater()));
-
     engineInitialized();
-
-    QTimer::singleShot(0, d->thread_, SLOT(start()));
 }
 
 QGeoTileFetcher *QGeoTiledMappingManagerEngine::tileFetcher()
@@ -318,17 +296,13 @@ QSharedPointer<QGeoTileTexture> QGeoTiledMappingManagerEngine::getTileTexture(co
 *******************************************************************************/
 
 QGeoTiledMappingManagerEnginePrivate::QGeoTiledMappingManagerEnginePrivate()
-  : thread_(0),
-    cacheHint_(QGeoTiledMappingManagerEngine::AllCaches),
-    tileCache_(0),
-    fetcher_(0) {}
+:   cacheHint_(QGeoTiledMappingManagerEngine::AllCaches), tileCache_(0), fetcher_(0)
+{
+}
 
 QGeoTiledMappingManagerEnginePrivate::~QGeoTiledMappingManagerEnginePrivate()
 {
     delete tileCache_;
-
-    // will delete fetcher and thread later
-    thread_->exit();
 }
 
 #include "moc_qgeotiledmappingmanagerengine_p.cpp"
diff --git a/src/location/maps/qgeotiledmappingmanagerengine_p_p.h b/src/location/maps/qgeotiledmappingmanagerengine_p_p.h
index ae26ab46..dfdab6de 100644
--- a/src/location/maps/qgeotiledmappingmanagerengine_p_p.h
+++ b/src/location/maps/qgeotiledmappingmanagerengine_p_p.h
@@ -55,10 +55,8 @@
 //
 
 #include <QSize>
-#include <QList>
 #include <QHash>
 #include <QSet>
-#include <QThread>
 #include "qgeotiledmappingmanagerengine_p.h"
 
 QT_BEGIN_NAMESPACE
@@ -74,7 +72,6 @@ public:
     QGeoTiledMappingManagerEnginePrivate();
     ~QGeoTiledMappingManagerEnginePrivate();
 
-    QThread *thread_;
     QSize tileSize_;
     QSet<QGeoTiledMapData *> tileMaps_;
     QHash<QGeoTiledMapData *, QSet<QGeoTileSpec> > mapHash_;
diff --git a/src/location/maps/qgeotilefetcher.cpp b/src/location/maps/qgeotilefetcher.cpp
index a86c0a43..e0d6b6ea 100644
--- a/src/location/maps/qgeotilefetcher.cpp
+++ b/src/location/maps/qgeotilefetcher.cpp
@@ -50,21 +50,8 @@
 
 QT_BEGIN_NAMESPACE
 
-QGeoTileFetcher::QGeoTileFetcher(QGeoTiledMappingManagerEngine *engine, QObject *parent)
-    : QObject(parent),
-      d_ptr(new QGeoTileFetcherPrivate(engine))
-{
-    Q_D(QGeoTileFetcher);
-    d->engine_ = engine;
-}
-
-QGeoTileFetcher::~QGeoTileFetcher()
-{
-    Q_D(QGeoTileFetcher);
-    delete d;
-}
-
-void QGeoTileFetcher::threadStarted()
+QGeoTileFetcher::QGeoTileFetcher(QObject *parent)
+:   QObject(parent), d_ptr(new QGeoTileFetcherPrivate)
 {
     Q_D(QGeoTileFetcher);
 
@@ -74,18 +61,10 @@ void QGeoTileFetcher::threadStarted()
         d->timer_.start(0, this);
 }
 
-bool QGeoTileFetcher::init()
-{
-    return false;
-}
-
-void QGeoTileFetcher::threadFinished()
+QGeoTileFetcher::~QGeoTileFetcher()
 {
-    Q_D(QGeoTileFetcher);
 
-    d->enabled_ = false;
-    d->timer_.stop();
-    this->deleteLater();
+    delete d_ptr;
 }
 
 void QGeoTileFetcher::updateTileRequests(const QSet<QGeoTileSpec> &tilesAdded,
@@ -213,8 +192,8 @@ void QGeoTileFetcher::handleReply(QGeoTiledMapReply *reply, const QGeoTileSpec &
 /*******************************************************************************
 *******************************************************************************/
 
-QGeoTileFetcherPrivate::QGeoTileFetcherPrivate(QGeoTiledMappingManagerEngine *engine)
-:   engine_(engine), enabled_(false)
+QGeoTileFetcherPrivate::QGeoTileFetcherPrivate()
+:   enabled_(false)
 {
 }
 
diff --git a/src/location/maps/qgeotilefetcher_p.h b/src/location/maps/qgeotilefetcher_p.h
index d08092b9..36b6e0dc 100644
--- a/src/location/maps/qgeotilefetcher_p.h
+++ b/src/location/maps/qgeotilefetcher_p.h
@@ -72,12 +72,10 @@ class Q_LOCATION_EXPORT QGeoTileFetcher : public QObject
     Q_OBJECT
 
 public:
-    QGeoTileFetcher(QGeoTiledMappingManagerEngine *engine, QObject *parent = 0);
+    QGeoTileFetcher(QObject *parent = 0);
     virtual ~QGeoTileFetcher();
 
 public Q_SLOTS:
-    void threadStarted();
-    void threadFinished();
     void updateTileRequests(const QSet<QGeoTileSpec> &tilesAdded, const QSet<QGeoTileSpec> &tilesRemoved);
 
 private Q_SLOTS:
@@ -91,7 +89,6 @@ Q_SIGNALS:
 
 protected:
     void timerEvent(QTimerEvent *event);
-    virtual bool init();
     QGeoTiledMappingManagerEngine::CacheAreas cacheHint() const;
 
 private:
diff --git a/src/location/maps/qgeotilefetcher_p_p.h b/src/location/maps/qgeotilefetcher_p_p.h
index c47f8f90..aa452413 100644
--- a/src/location/maps/qgeotilefetcher_p_p.h
+++ b/src/location/maps/qgeotilefetcher_p_p.h
@@ -73,11 +73,9 @@ class QGeoTiledMappingManagerEngine;
 class QGeoTileFetcherPrivate
 {
 public:
-    explicit QGeoTileFetcherPrivate(QGeoTiledMappingManagerEngine *engine);
+    QGeoTileFetcherPrivate();
     virtual ~QGeoTileFetcherPrivate();
 
-    QGeoTiledMappingManagerEngine *engine_;
-
     bool enabled_;
     QBasicTimer timer_;
     QMutex queueMutex_;