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/****************************************************************************
**
** Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "stringtoint_p.h"
#include <QMutex>
#include <QReadWriteLock>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
namespace {
QMutex mutex;
QReadWriteLock readLock;
} // anonymous
QVector<QString> StringToInt::m_stringsArray = QVector<QString>();
QVector<QString> StringToInt::m_pendingStringsArray = QVector<QString>();
int StringToInt::m_calls = 0;
int StringToInt::lookupId(const QString &str)
{
// Note: how do we protect against the case where
// we are synching the two arrays ?
QReadLocker readLocker(&readLock);
int idx = StringToInt::m_stringsArray.indexOf(str);
if (Q_UNLIKELY(idx < 0)) {
QMutexLocker lock(&mutex);
// If not found in m_stringsArray, maybe it's in the pending array
if ((idx = StringToInt::m_pendingStringsArray.indexOf(str)) >= 0) {
idx += StringToInt::m_stringsArray.size();
} else {
// If not, we add it to the m_pendingStringArray
StringToInt::m_pendingStringsArray.push_back(str);
idx = StringToInt::m_stringsArray.size() + m_pendingStringsArray.size() - 1;
}
// We sync the two arrays every 20 calls
if (StringToInt::m_calls % 20 == 0 && StringToInt::m_pendingStringsArray.size() > 0) {
// Unlock reader to writeLock
// since a read lock cannot be locked for writing
readLocker.unlock();
QWriteLocker writeLock(&readLock);
StringToInt::m_stringsArray += StringToInt::m_pendingStringsArray;
StringToInt::m_pendingStringsArray.clear();
StringToInt::m_calls = 0;
}
}
return idx;
}
QString StringToInt::lookupString(int idx)
{
QReadLocker readLocker(&readLock);
if (Q_LIKELY(StringToInt::m_stringsArray.size() > idx))
return StringToInt::m_stringsArray.at(idx);
// Maybe it's in the pending array then
QMutexLocker lock(&mutex);
if (StringToInt::m_stringsArray.size() + StringToInt::m_pendingStringsArray.size() > idx)
return StringToInt::m_pendingStringsArray.at(idx - StringToInt::m_stringsArray.size());
return QString();
}
} // Render
} // Qt3DRender
QT_END_NAMESPACE
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