2010-02-23 20:26:21 +01:00
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#include "albumcoverfetcher.h"
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#include <QNetworkReply>
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2010-02-28 20:25:52 +01:00
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#include <QTimer>
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2010-02-23 20:26:21 +01:00
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#include <lastfm/Artist>
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#include <lastfm/XmlQuery>
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#include <lastfm/ws.h>
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2010-02-28 20:25:52 +01:00
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const int AlbumCoverFetcher::kMaxConcurrentRequests = 5;
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2010-02-23 20:26:21 +01:00
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AlbumCoverFetcher::AlbumCoverFetcher(QObject* parent)
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2010-02-28 20:25:52 +01:00
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: QObject(parent),
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next_id_(0),
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request_starter_(new QTimer(this))
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{
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request_starter_->setInterval(1000);
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connect(request_starter_, SIGNAL(timeout()), SLOT(StartRequests()));
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2010-02-23 20:26:21 +01:00
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}
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2010-02-28 20:25:52 +01:00
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quint64 AlbumCoverFetcher::FetchAlbumCover(
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2010-02-23 20:26:21 +01:00
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const QString& artist_name, const QString& album_name) {
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2010-02-28 20:25:52 +01:00
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QueuedRequest request;
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request.album = album_name;
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request.artist = artist_name;
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request.id = next_id_ ++;
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queued_requests_.enqueue(request);
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if (!request_starter_->isActive())
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request_starter_->start();
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if (active_requests_.count() < kMaxConcurrentRequests)
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StartRequests();
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return request.id;
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}
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void AlbumCoverFetcher::Clear() {
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queued_requests_.clear();
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}
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void AlbumCoverFetcher::StartRequests() {
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if (queued_requests_.isEmpty()) {
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request_starter_->stop();
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return;
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}
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while (!queued_requests_.isEmpty() &&
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active_requests_.count() < kMaxConcurrentRequests) {
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QueuedRequest request = queued_requests_.dequeue();
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lastfm::Artist artist(request.artist);
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lastfm::Album album(artist, request.album);
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2010-02-23 20:26:21 +01:00
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2010-02-28 20:25:52 +01:00
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QNetworkReply* reply = album.getInfo();
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connect(reply, SIGNAL(finished()), SLOT(AlbumGetInfoFinished()));
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active_requests_.insert(reply, request.id);
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}
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2010-02-23 20:26:21 +01:00
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}
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void AlbumCoverFetcher::AlbumGetInfoFinished() {
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QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
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reply->deleteLater();
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2010-02-28 20:25:52 +01:00
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quint64 id = active_requests_.take(reply);
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2010-02-23 20:26:21 +01:00
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2010-02-28 20:25:52 +01:00
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try {
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lastfm::XmlQuery query(lastfm::ws::parse(reply));
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2010-02-23 20:26:21 +01:00
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2010-02-28 20:25:52 +01:00
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QUrl image_url(query["album"]["image size=large"].text());
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QNetworkReply* image_reply = network_.get(QNetworkRequest(image_url));
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connect(image_reply, SIGNAL(finished()), SLOT(AlbumCoverFetchFinished()));
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2010-02-23 20:26:21 +01:00
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2010-02-28 20:25:52 +01:00
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active_requests_[image_reply] = id;
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} catch (std::runtime_error&) {
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emit AlbumCoverFetched(id, QImage());
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}
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2010-02-23 20:26:21 +01:00
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}
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void AlbumCoverFetcher::AlbumCoverFetchFinished() {
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QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
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reply->deleteLater();
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QImage image;
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image.loadFromData(reply->readAll());
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2010-02-28 20:25:52 +01:00
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quint64 id = active_requests_.take(reply);
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emit AlbumCoverFetched(id, image);
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2010-02-23 20:26:21 +01:00
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}
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