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<h1 class="title">ratecontroller.cpp Example File</h1>
<span class="small-subtitle">network/torrent/ratecontroller.cpp</span>
<!-- $$$network/torrent/ratecontroller.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
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** the documentation and/or other materials provided with the
** distribution.
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &quot;peerwireclient.h&quot;</span>
<span class="preprocessor">#include &quot;ratecontroller.h&quot;</span>
<span class="preprocessor">#include &lt;QtCore&gt;</span>
Q_GLOBAL_STATIC(RateController<span class="operator">,</span> rateController)
RateController <span class="operator">*</span>RateController<span class="operator">::</span>instance()
{
<span class="keyword">return</span> rateController();
}
<span class="type">void</span> RateController<span class="operator">::</span>addSocket(PeerWireClient <span class="operator">*</span>socket)
{
connect(socket<span class="operator">,</span> SIGNAL(readyToTransfer())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(scheduleTransfer()));
socket<span class="operator">-</span><span class="operator">&gt;</span>setReadBufferSize(downLimit <span class="operator">*</span> <span class="number">4</span>);
sockets <span class="operator">&lt;</span><span class="operator">&lt;</span> socket;
scheduleTransfer();
}
<span class="type">void</span> RateController<span class="operator">::</span>removeSocket(PeerWireClient <span class="operator">*</span>socket)
{
disconnect(socket<span class="operator">,</span> SIGNAL(readyToTransfer())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(scheduleTransfer()));
socket<span class="operator">-</span><span class="operator">&gt;</span>setReadBufferSize(<span class="number">0</span>);
sockets<span class="operator">.</span>remove(socket);
}
<span class="type">void</span> RateController<span class="operator">::</span>setDownloadLimit(<span class="type">int</span> bytesPerSecond)
{
downLimit <span class="operator">=</span> bytesPerSecond;
foreach (PeerWireClient <span class="operator">*</span>socket<span class="operator">,</span> sockets)
socket<span class="operator">-</span><span class="operator">&gt;</span>setReadBufferSize(downLimit <span class="operator">*</span> <span class="number">4</span>);
}
<span class="type">void</span> RateController<span class="operator">::</span>scheduleTransfer()
{
<span class="keyword">if</span> (transferScheduled)
<span class="keyword">return</span>;
transferScheduled <span class="operator">=</span> <span class="keyword">true</span>;
<span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">50</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(transfer()));
}
<span class="type">void</span> RateController<span class="operator">::</span>transfer()
{
transferScheduled <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">if</span> (sockets<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
<span class="type">int</span> msecs <span class="operator">=</span> <span class="number">1000</span>;
<span class="keyword">if</span> (<span class="operator">!</span>stopWatch<span class="operator">.</span>isNull())
msecs <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(msecs<span class="operator">,</span> stopWatch<span class="operator">.</span>elapsed());
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bytesToWrite <span class="operator">=</span> (upLimit <span class="operator">*</span> msecs) <span class="operator">/</span> <span class="number">1000</span>;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bytesToRead <span class="operator">=</span> (downLimit <span class="operator">*</span> msecs) <span class="operator">/</span> <span class="number">1000</span>;
<span class="keyword">if</span> (bytesToWrite <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> bytesToRead <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
scheduleTransfer();
<span class="keyword">return</span>;
}
<span class="type"><a href="qset.html">QSet</a></span><span class="operator">&lt;</span>PeerWireClient <span class="operator">*</span><span class="operator">&gt;</span> pendingSockets;
foreach (PeerWireClient <span class="operator">*</span>client<span class="operator">,</span> sockets) {
<span class="keyword">if</span> (client<span class="operator">-</span><span class="operator">&gt;</span>canTransferMore())
pendingSockets <span class="operator">&lt;</span><span class="operator">&lt;</span> client;
}
<span class="keyword">if</span> (pendingSockets<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
stopWatch<span class="operator">.</span>start();
<span class="type">bool</span> canTransferMore;
<span class="keyword">do</span> {
canTransferMore <span class="operator">=</span> <span class="keyword">false</span>;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> writeChunk <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">&gt;</span>(<span class="number">1</span><span class="operator">,</span> bytesToWrite <span class="operator">/</span> pendingSockets<span class="operator">.</span>size());
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> readChunk <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">&gt;</span>(<span class="number">1</span><span class="operator">,</span> bytesToRead <span class="operator">/</span> pendingSockets<span class="operator">.</span>size());
<span class="type"><a href="qsetiterator.html">QSetIterator</a></span><span class="operator">&lt;</span>PeerWireClient <span class="operator">*</span><span class="operator">&gt;</span> it(pendingSockets);
<span class="keyword">while</span> (it<span class="operator">.</span>hasNext() <span class="operator">&amp;</span><span class="operator">&amp;</span> (bytesToWrite <span class="operator">&gt;</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> bytesToRead <span class="operator">&gt;</span> <span class="number">0</span>)) {
PeerWireClient <span class="operator">*</span>socket <span class="operator">=</span> it<span class="operator">.</span>next();
<span class="keyword">if</span> (socket<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>ConnectedState) {
pendingSockets<span class="operator">.</span>remove(socket);
<span class="keyword">continue</span>;
}
<span class="type">bool</span> dataTransferred <span class="operator">=</span> <span class="keyword">false</span>;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> available <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">&gt;</span>(socket<span class="operator">-</span><span class="operator">&gt;</span>socketBytesAvailable()<span class="operator">,</span> readChunk);
<span class="keyword">if</span> (available <span class="operator">&gt;</span> <span class="number">0</span>) {
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> readBytes <span class="operator">=</span> socket<span class="operator">-</span><span class="operator">&gt;</span>readFromSocket(<a href="qtglobal.html#qMin">qMin</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">&gt;</span>(available<span class="operator">,</span> bytesToRead));
<span class="keyword">if</span> (readBytes <span class="operator">&gt;</span> <span class="number">0</span>) {
bytesToRead <span class="operator">-</span><span class="operator">=</span> readBytes;
dataTransferred <span class="operator">=</span> <span class="keyword">true</span>;
}
}
<span class="keyword">if</span> (upLimit <span class="operator">*</span> <span class="number">2</span> <span class="operator">&gt;</span> socket<span class="operator">-</span><span class="operator">&gt;</span>bytesToWrite()) {
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> chunkSize <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">&gt;</span>(writeChunk<span class="operator">,</span> bytesToWrite);
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> toWrite <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(upLimit <span class="operator">*</span> <span class="number">2</span> <span class="operator">-</span> socket<span class="operator">-</span><span class="operator">&gt;</span>bytesToWrite()<span class="operator">,</span> chunkSize);
<span class="keyword">if</span> (toWrite <span class="operator">&gt;</span> <span class="number">0</span>) {
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> writtenBytes <span class="operator">=</span> socket<span class="operator">-</span><span class="operator">&gt;</span>writeToSocket(toWrite);
<span class="keyword">if</span> (writtenBytes <span class="operator">&gt;</span> <span class="number">0</span>) {
bytesToWrite <span class="operator">-</span><span class="operator">=</span> writtenBytes;
dataTransferred <span class="operator">=</span> <span class="keyword">true</span>;
}
}
}
<span class="keyword">if</span> (dataTransferred <span class="operator">&amp;</span><span class="operator">&amp;</span> socket<span class="operator">-</span><span class="operator">&gt;</span>canTransferMore())
canTransferMore <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">else</span>
pendingSockets<span class="operator">.</span>remove(socket);
}
} <span class="keyword">while</span> (canTransferMore <span class="operator">&amp;</span><span class="operator">&amp;</span> (bytesToWrite <span class="operator">&gt;</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> bytesToRead <span class="operator">&gt;</span> <span class="number">0</span>) <span class="operator">&amp;</span><span class="operator">&amp;</span> <span class="operator">!</span>pendingSockets<span class="operator">.</span>isEmpty());
<span class="keyword">if</span> (canTransferMore <span class="operator">|</span><span class="operator">|</span> bytesToWrite <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> bytesToRead <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
scheduleTransfer();
}</pre>
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<!-- @@@network/torrent/ratecontroller.cpp -->
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