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/****************************************************************************
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the examples of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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****************************************************************************/
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#include "peerwireclient.h"
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#include "ratecontroller.h"
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Q_GLOBAL_STATIC(RateController, rateController)
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RateController *RateController::instance()
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return rateController();
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void RateController::addSocket(PeerWireClient *socket)
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connect(socket, SIGNAL(readyToTransfer()), this, SLOT(scheduleTransfer()));
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socket->setReadBufferSize(downLimit * 4);
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void RateController::removeSocket(PeerWireClient *socket)
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disconnect(socket, SIGNAL(readyToTransfer()), this, SLOT(scheduleTransfer()));
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socket->setReadBufferSize(0);
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sockets.remove(socket);
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void RateController::setDownloadLimit(int bytesPerSecond)
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downLimit = bytesPerSecond;
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foreach (PeerWireClient *socket, sockets)
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socket->setReadBufferSize(downLimit * 4);
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void RateController::scheduleTransfer()
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if (transferScheduled)
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transferScheduled = true;
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QTimer::singleShot(50, this, SLOT(transfer()));
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void RateController::transfer()
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transferScheduled = false;
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if (sockets.isEmpty())
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if (!stopWatch.isNull())
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msecs = qMin(msecs, stopWatch.elapsed());
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qint64 bytesToWrite = (upLimit * msecs) / 1000;
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qint64 bytesToRead = (downLimit * msecs) / 1000;
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if (bytesToWrite == 0 && bytesToRead == 0) {
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QSet<PeerWireClient *> pendingSockets;
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foreach (PeerWireClient *client, sockets) {
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if (client->canTransferMore())
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pendingSockets << client;
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if (pendingSockets.isEmpty())
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bool canTransferMore;
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canTransferMore = false;
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qint64 writeChunk = qMax<qint64>(1, bytesToWrite / pendingSockets.size());
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qint64 readChunk = qMax<qint64>(1, bytesToRead / pendingSockets.size());
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QSetIterator<PeerWireClient *> it(pendingSockets);
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while (it.hasNext() && (bytesToWrite > 0 || bytesToRead > 0)) {
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PeerWireClient *socket = it.next();
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if (socket->state() != QAbstractSocket::ConnectedState) {
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pendingSockets.remove(socket);
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bool dataTransferred = false;
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qint64 available = qMin<qint64>(socket->socketBytesAvailable(), readChunk);
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qint64 readBytes = socket->readFromSocket(qMin<qint64>(available, bytesToRead));
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bytesToRead -= readBytes;
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dataTransferred = true;
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if (upLimit * 2 > socket->bytesToWrite()) {
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qint64 chunkSize = qMin<qint64>(writeChunk, bytesToWrite);
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qint64 toWrite = qMin(upLimit * 2 - socket->bytesToWrite(), chunkSize);
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qint64 writtenBytes = socket->writeToSocket(toWrite);
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if (writtenBytes > 0) {
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bytesToWrite -= writtenBytes;
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dataTransferred = true;
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if (dataTransferred && socket->canTransferMore())
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canTransferMore = true;
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pendingSockets.remove(socket);
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} while (canTransferMore && (bytesToWrite > 0 || bytesToRead > 0) && !pendingSockets.isEmpty());
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if (canTransferMore || bytesToWrite == 0 || bytesToRead == 0)