vcs.maemo.org Git - situare/blob - src/map/mapfetcher.cpp

   1 /*
   2    Situare - A location system for Facebook
   3    Copyright (C) 2010  Ixonos Plc. Authors:
   4
   5        Jussi Laitinen - jussi.laitinen@ixonos.com
   6
   7    Situare is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License
   9    version 2 as published by the Free Software Foundation.
  10
  11    Situare is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with Situare; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  19    USA.
  20 */
  21
  22 #include <QNetworkAccessManager>
  23 #include <QNetworkRequest>
  24 #include <QNetworkReply>
  25 #include <QUrl>
  26 #include <QDebug>
  27 #include <QPixmap>
  28 #include <QNetworkDiskCache>
  29 #include <QDesktopServices>
  30
  31 #include "mapfetcher.h"
  32
  33 static int MAX_PARALLEL_DOWNLOADS = 2;
  34
  35 MapFetcher::MapFetcher(QObject *parent, QNetworkAccessManager *manager)
  36     : QObject(parent), m_manager(manager)
  37 {
  38     QNetworkDiskCache *diskCache = new QNetworkDiskCache(this);
  39
  40     diskCache->setCacheDirectory(QDesktopServices::storageLocation(
  41             QDesktopServices::CacheLocation));
  42
  43     m_manager->setCache(diskCache);
  44
  45     connect(m_manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(downloadFinished(QNetworkReply*)));
  46 }
  47
  48 void MapFetcher::fetchMapImage(const QUrl &url)
  49 {
  50     qDebug() << __PRETTY_FUNCTION__;
  51
  52     if (url.isEmpty() || !url.isValid())
  53         return;
  54
  55     //Limit parallel downloads
  56     if (downloadQueue.length() < MAX_PARALLEL_DOWNLOADS)
  57         QTimer::singleShot(0, this, SLOT(startNextDownload()));
  58
  59     downloadQueue.enqueue(url);
  60 }
  61
  62 void MapFetcher::startNextDownload()
  63 {
  64     qDebug() << __PRETTY_FUNCTION__;
  65
  66     if (downloadQueue.isEmpty())
  67         return;
  68
  69     QUrl url = downloadQueue.dequeue();
  70     QNetworkRequest request(url);
  71     request.setRawHeader("User-Agent", "Map Test");
  72     request.setAttribute(QNetworkRequest::CacheLoadControlAttribute,
  73                                               QNetworkRequest::PreferCache);
  74
  75     QNetworkReply *reply = m_manager->get(request);
  76     currentDownloads.append(reply);
  77 }
  78
  79 void MapFetcher::downloadFinished(QNetworkReply *reply)
  80 {
  81     qDebug() << __PRETTY_FUNCTION__;
  82
  83     if (reply->error() == QNetworkReply::NoError) {
  84         QImage image;
  85         QUrl url = reply->url();
  86
  87         if (!image.load(reply, 0)) {
  88             image = QImage();
  89         }
  90
  91         emit mapImageReceived(url, QPixmap::fromImage(image));
  92     }
  93     else {
  94         emit error(reply->errorString());
  95     }
  96
  97     currentDownloads.removeAll(reply);
  98     reply->deleteLater();
  99     startNextDownload();
 100 }
 101
 102 MapFetcher::~MapFetcher()
 103 {
 104
 105 }