forked from qt-creator/qt-creator
f6f59c08d5
The 4.8 Version of QDataStream is the lowest common denominator. temporaryOutDataStream.setVersion(QDataStream::Qt_4_8); Change-Id: I4aa681473b6349bd3e859f49d7233ff4a6d2911b Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
147 lines
4.4 KiB
C++
147 lines
4.4 KiB
C++
/**************************************************************************
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**
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** This file is part of Qt Creator
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**
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** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: http://www.qt-project.org/
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**
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**
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** GNU Lesser General Public License Usage
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**
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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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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**
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** Other Usage
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**
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**************************************************************************/
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#include "valueschangedcommand.h"
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#include <QSharedMemory>
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#include <QCache>
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#include <cstring>
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namespace QmlDesigner {
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static QCache<qint32, QSharedMemory> globalSharedMemoryCache(10000);
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ValuesChangedCommand::ValuesChangedCommand()
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: m_keyNumber(0)
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{
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}
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ValuesChangedCommand::ValuesChangedCommand(const QVector<PropertyValueContainer> &valueChangeVector)
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: m_valueChangeVector (valueChangeVector),
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m_keyNumber(0)
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{
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}
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QVector<PropertyValueContainer> ValuesChangedCommand::valueChanges() const
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{
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return m_valueChangeVector;
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}
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quint32 ValuesChangedCommand::keyNumber() const
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{
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return m_keyNumber;
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}
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void ValuesChangedCommand::removeSharedMemorys(const QVector<qint32> &keyNumberVector)
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{
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foreach (qint32 keyNumber, keyNumberVector) {
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QSharedMemory *sharedMemory = globalSharedMemoryCache.take(keyNumber);
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delete sharedMemory;
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}
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}
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static const QLatin1String valueKeyTemplateString("Values-%1");
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static QSharedMemory *createSharedMemory(qint32 key, int byteCount)
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{
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QSharedMemory *sharedMemory = new QSharedMemory(QString(valueKeyTemplateString).arg(key));
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bool sharedMemoryIsCreated = sharedMemory->create(byteCount);
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if (!sharedMemoryIsCreated) {
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if (sharedMemory->isAttached())
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sharedMemory->attach();
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sharedMemory->detach();
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sharedMemoryIsCreated = sharedMemory->create(byteCount);
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}
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if (sharedMemoryIsCreated) {
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globalSharedMemoryCache.insert(key, sharedMemory);
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return sharedMemory;
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}
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return 0;
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}
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QDataStream &operator<<(QDataStream &out, const ValuesChangedCommand &command)
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{
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static const bool dontUseSharedMemory = !qgetenv("DESIGNER_DONT_USE_SHARED_MEMORY").isEmpty();
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if (!dontUseSharedMemory && command.valueChanges().count() > 5) {
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static quint32 keyCounter = 0;
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++keyCounter;
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command.m_keyNumber = keyCounter;
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QByteArray outDataStreamByteArray;
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QDataStream temporaryOutDataStream(&outDataStreamByteArray, QIODevice::WriteOnly);
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temporaryOutDataStream.setVersion(QDataStream::Qt_4_8);
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temporaryOutDataStream << command.valueChanges();;
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QSharedMemory *sharedMemory = createSharedMemory(keyCounter, outDataStreamByteArray.size());
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if (sharedMemory) {
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std::memcpy(sharedMemory->data(), outDataStreamByteArray.constData(), sharedMemory->size());
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out << command.keyNumber();
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return out;
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}
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}
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out << qint32(0);
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out << command.valueChanges();
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return out;
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}
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void readSharedMemory(qint32 key, QVector<PropertyValueContainer> *valueChangeVector)
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{
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QSharedMemory sharedMemory(QString(valueKeyTemplateString).arg(key));
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bool canAttach = sharedMemory.attach(QSharedMemory::ReadOnly);
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if (canAttach) {
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QDataStream in(QByteArray::fromRawData(static_cast<const char*>(sharedMemory.constData()), sharedMemory.size()));
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in.setVersion(QDataStream::Qt_4_8);
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in >> *valueChangeVector;
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}
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}
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QDataStream &operator>>(QDataStream &in, ValuesChangedCommand &command)
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{
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in >> command.m_keyNumber;
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if (command.keyNumber() > 0) {
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readSharedMemory(command.keyNumber(), &command.m_valueChangeVector);
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} else {
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in >> command.m_valueChangeVector;
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}
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return in;
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}
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} // namespace QmlDesigner
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