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/****************************************************************************
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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** This file is part of the examples of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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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)