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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtLocation module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qgeotilerequestmanager_p.h"
#include "qgeotilespec_p.h"
#include "qgeotiledmap_p.h"
#include "qgeotiledmappingmanagerengine_p.h"
#include "qabstractgeotilecache_p.h"
#include <QtCore/QPointer>
QT_BEGIN_NAMESPACE
class RetryFuture;
class QGeoTileRequestManagerPrivate
{
public:
explicit QGeoTileRequestManagerPrivate(QGeoTiledMap *map, QGeoTiledMappingManagerEngine *engine);
~QGeoTileRequestManagerPrivate();
QGeoTiledMap *m_map;
QPointer<QGeoTiledMappingManagerEngine> m_engine;
QMap<QGeoTileSpec, QSharedPointer<QGeoTileTexture> > requestTiles(const QSet<QGeoTileSpec> &tiles);
void tileError(const QGeoTileSpec &tile, const QString &errorString);
QHash<QGeoTileSpec, int> m_retries;
QHash<QGeoTileSpec, QSharedPointer<RetryFuture> > m_futures;
QSet<QGeoTileSpec> m_requested;
void tileFetched(const QGeoTileSpec &spec);
};
QGeoTileRequestManager::QGeoTileRequestManager(QGeoTiledMap *map, QGeoTiledMappingManagerEngine *engine)
: d_ptr(new QGeoTileRequestManagerPrivate(map, engine))
{
}
QGeoTileRequestManager::~QGeoTileRequestManager()
{
}
QMap<QGeoTileSpec, QSharedPointer<QGeoTileTexture> > QGeoTileRequestManager::requestTiles(const QSet<QGeoTileSpec> &tiles)
{
return d_ptr->requestTiles(tiles);
}
void QGeoTileRequestManager::tileFetched(const QGeoTileSpec &spec)
{
d_ptr->tileFetched(spec);
}
QSharedPointer<QGeoTileTexture> QGeoTileRequestManager::tileTexture(const QGeoTileSpec &spec)
{
if (d_ptr->m_engine)
return d_ptr->m_engine->getTileTexture(spec);
else
return QSharedPointer<QGeoTileTexture>();
}
void QGeoTileRequestManager::tileError(const QGeoTileSpec &tile, const QString &errorString)
{
d_ptr->tileError(tile, errorString);
}
QGeoTileRequestManagerPrivate::QGeoTileRequestManagerPrivate(QGeoTiledMap *map,QGeoTiledMappingManagerEngine *engine)
: m_map(map),
m_engine(engine)
{
}
QGeoTileRequestManagerPrivate::~QGeoTileRequestManagerPrivate()
{
}
QMap<QGeoTileSpec, QSharedPointer<QGeoTileTexture> > QGeoTileRequestManagerPrivate::requestTiles(const QSet<QGeoTileSpec> &tiles)
{
QSet<QGeoTileSpec> cancelTiles = m_requested - tiles;
QSet<QGeoTileSpec> requestTiles = tiles - m_requested;
QSet<QGeoTileSpec> cached;
// int tileSize = tiles.size();
// int newTiles = requestTiles.size();
typedef QSet<QGeoTileSpec>::const_iterator iter;
QMap<QGeoTileSpec, QSharedPointer<QGeoTileTexture> > cachedTex;
// remove tiles in cache from request tiles
if (!m_engine.isNull()) {
iter i = requestTiles.constBegin();
iter end = requestTiles.constEnd();
for (; i != end; ++i) {
QGeoTileSpec tile = *i;
QSharedPointer<QGeoTileTexture> tex = m_engine->getTileTexture(tile);
if (tex) {
cachedTex.insert(tile, tex);
cached.insert(tile);
} else {
// Try to use textures from lower zoom levels, but still request the proper tile
QGeoTileSpec spec = tile;
const int endRange = qMax(0, tile.zoom() - 4); // Using up to 4 zoom levels up. 4 is arbitrary.
for (int z = tile.zoom() - 1; z >= endRange; z--) {
int denominator = 1 << (tile.zoom() - z);
spec.setZoom(z);
spec.setX(tile.x() / denominator);
spec.setY(tile.y() / denominator);
QSharedPointer<QGeoTileTexture> t = m_engine->getTileTexture(spec);
if (t) {
cachedTex.insert(tile, t);
break;
}
}
}
}
}
requestTiles -= cached;
m_requested -= cancelTiles;
m_requested += requestTiles;
// qDebug() << "required # tiles: " << tileSize << ", new tiles: " << newTiles << ", total server requests: " << requested_.size();
if (!requestTiles.isEmpty() || !cancelTiles.isEmpty()) {
if (!m_engine.isNull()) {
// qDebug() << "new server requests: " << requestTiles.size() << ", server cancels: " << cancelTiles.size();
m_engine->updateTileRequests(m_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) {
m_retries.remove(*i);
m_futures.remove(*i);
}
}
}
return cachedTex;
}
void QGeoTileRequestManagerPrivate::tileFetched(const QGeoTileSpec &spec)
{
m_map->updateTile(spec);
m_requested.remove(spec);
m_retries.remove(spec);
m_futures.remove(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, QGeoTiledMap *map, QGeoTiledMappingManagerEngine* engine, QObject *parent = 0);
public Q_SLOTS:
void retry();
private:
QGeoTileSpec m_tile;
QGeoTiledMap *m_map;
QPointer<QGeoTiledMappingManagerEngine> m_engine;
};
RetryFuture::RetryFuture(const QGeoTileSpec &tile, QGeoTiledMap *map, QGeoTiledMappingManagerEngine* engine, QObject *parent)
: QObject(parent), m_tile(tile), m_map(map), m_engine(engine)
{}
void RetryFuture::retry()
{
QSet<QGeoTileSpec> requestTiles;
QSet<QGeoTileSpec> cancelTiles;
requestTiles.insert(m_tile);
if (!m_engine.isNull())
m_engine->updateTileRequests(m_map, requestTiles, cancelTiles);
}
void QGeoTileRequestManagerPrivate::tileError(const QGeoTileSpec &tile, const QString &errorString)
{
if (m_requested.contains(tile)) {
int count = m_retries.value(tile, 0);
m_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));
m_requested.remove(tile);
m_retries.remove(tile);
m_futures.remove(tile);
} else {
// Exponential time backoff when retrying
int delay = (1 << count) * 500;
QSharedPointer<RetryFuture> future(new RetryFuture(tile,m_map,m_engine));
m_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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