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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtLocation module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qgeotilerequestmanager_p.h"
#include <QSharedPointer>
#include "qgeotilespec.h"
#include "qgeotiledmapdata_p.h"
#include "qgeotiledmappingmanagerengine.h"
#include "qgeotilecache_p.h"
QT_BEGIN_NAMESPACE
class RetryFuture;
class QGeoTileRequestManagerPrivate
{
public:
explicit QGeoTileRequestManagerPrivate(QGeoTiledMapData *map);
~QGeoTileRequestManagerPrivate();
QGeoTiledMapData *map_;
QGeoTileCache *cache_;
QList<QSharedPointer<QGeoTileTexture> > requestTiles(const QSet<QGeoTileSpec> &tiles);
void tileError(const QGeoTileSpec &tile, const QString &errorString);
QHash<QGeoTileSpec, int> retries_;
QHash<QGeoTileSpec, QSharedPointer<RetryFuture> > futures_;
QSet<QGeoTileSpec> visible_;
QSet<QGeoTileSpec> requested_;
void tileFetched(QSharedPointer<QGeoTileTexture> texture);
};
QGeoTileRequestManager::QGeoTileRequestManager(QGeoTiledMapData *map)
: d_ptr(new QGeoTileRequestManagerPrivate(map))
{
}
QGeoTileRequestManager::~QGeoTileRequestManager()
{
delete d_ptr;
}
QList<QSharedPointer<QGeoTileTexture> > QGeoTileRequestManager::requestTiles(const QSet<QGeoTileSpec> &tiles)
{
Q_D(QGeoTileRequestManager);
return d->requestTiles(tiles);
}
void QGeoTileRequestManager::tileFetched(QSharedPointer<QGeoTileTexture> texture)
{
Q_D(QGeoTileRequestManager);
d->tileFetched(texture);
}
void QGeoTileRequestManager::tileError(const QGeoTileSpec &tile, const QString &errorString)
{
Q_D(QGeoTileRequestManager);
d->tileError(tile, errorString);
}
QGeoTileRequestManagerPrivate::QGeoTileRequestManagerPrivate(QGeoTiledMapData *map)
: map_(map)
{
}
QGeoTileRequestManagerPrivate::~QGeoTileRequestManagerPrivate()
{
}
QList<QSharedPointer<QGeoTileTexture> > QGeoTileRequestManagerPrivate::requestTiles(const QSet<QGeoTileSpec> &tiles)
{
QSet<QGeoTileSpec> cancelTiles = requested_ - tiles;
QSet<QGeoTileSpec> requestTiles = tiles - visible_ - requested_;
QSet<QGeoTileSpec> cached;
typedef QSet<QGeoTileSpec>::const_iterator iter;
QList<QSharedPointer<QGeoTileTexture> > cachedTex;
QGeoTiledMappingManagerEngine *engine = map_ ?
static_cast<QGeoTiledMappingManagerEngine*>(map_->engine()) : 0;
// remove tiles in cache from request tiles
if (engine){
iter i = requestTiles.constBegin();
iter end = requestTiles.constEnd();
for (; i != end; ++i) {
QGeoTileSpec tile = *i;
QSharedPointer<QGeoTileTexture> tex = engine->getTileTexture(tile);
if (tex) {
cachedTex << tex;
cached.insert(tile);
}
}
}
requestTiles -= cached;
visible_ = tiles;
requested_ -= cancelTiles;
requested_ += requestTiles;
if (!requestTiles.isEmpty() || !cancelTiles.isEmpty()) {
if (engine) {
engine->updateTileRequests(map_, requestTiles, cancelTiles);
// Remove any cancelled tiles from the error retry hash to avoid
// re-using the numbers for a totally different request cycle.
iter i = cancelTiles.constBegin();
iter end = cancelTiles.constEnd();
for (; i != end; ++i) {
retries_.remove(*i);
futures_.remove(*i);
}
}
}
return cachedTex;
}
void QGeoTileRequestManagerPrivate::tileFetched(QSharedPointer<QGeoTileTexture> texture)
{
map_->newTileFetched(texture);
requested_.remove(texture->spec);
retries_.remove(texture->spec);
futures_.remove(texture->spec);
}
// Represents a tile that needs to be retried after a certain period of time
class RetryFuture : public QObject
{
Q_OBJECT
public:
RetryFuture(const QGeoTileSpec &tile, QGeoTiledMapData *map, QObject *parent=0);
public Q_SLOTS:
void retry();
private:
QGeoTileSpec tile_;
QGeoTiledMapData *map_;
};
RetryFuture::RetryFuture(const QGeoTileSpec &tile, QGeoTiledMapData *map, QObject *parent)
: QObject(parent), tile_(tile), map_(map)
{}
void RetryFuture::retry()
{
QSet<QGeoTileSpec> requestTiles;
QSet<QGeoTileSpec> cancelTiles;
requestTiles.insert(tile_);
if (map_)
{
QGeoTiledMappingManagerEngine *engine =
static_cast<QGeoTiledMappingManagerEngine*>(map_->engine());
engine->updateTileRequests(map_, requestTiles, cancelTiles);
}
}
void QGeoTileRequestManagerPrivate::tileError(const QGeoTileSpec &tile, const QString &errorString)
{
if (requested_.contains(tile)) {
int count = retries_.value(tile, 0);
retries_.insert(tile, count + 1);
if (count >= 5) {
qWarning("QGeoTileRequestManager: Failed to fetch tile (%d,%d,%d) 5 times, giving up. "
"Last error message was: '%s'",
tile.x(), tile.y(), tile.zoom(), qPrintable(errorString));
requested_.remove(tile);
retries_.remove(tile);
futures_.remove(tile);
} else {
// Exponential time backoff when retrying
int delay = (1 << count) * 500;
QSharedPointer<RetryFuture> future(new RetryFuture(tile, map_));
futures_.insert(tile, future);
QTimer::singleShot(delay, future.data(), SLOT(retry()));
// Passing .data() to singleShot is ok -- Qt will clean up the
// connection if the target qobject is deleted
}
}
}
#include "qgeotilerequestmanager.moc"
QT_END_NAMESPACE
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