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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "valueschangedcommand.h"
#include "sharedmemory.h"
#include <QCache>
#include <QDebug>
#include <QIODevice>
#include <cstring>
#include <algorithm>
namespace QmlDesigner {
// using cache as a container which deletes sharedmemory pointers at process exit
using GlobalSharedMemoryContainer = QCache<qint32, SharedMemory>;
Q_GLOBAL_STATIC_WITH_ARGS(GlobalSharedMemoryContainer, globalSharedMemoryContainer, (10000))
ValuesChangedCommand::ValuesChangedCommand()
: m_keyNumber(0)
{
}
ValuesChangedCommand::ValuesChangedCommand(const QVector<PropertyValueContainer> &valueChangeVector)
: m_valueChangeVector (valueChangeVector),
m_keyNumber(0)
{
}
const QVector<PropertyValueContainer> ValuesChangedCommand::valueChanges() const
{
return m_valueChangeVector;
}
quint32 ValuesChangedCommand::keyNumber() const
{
return m_keyNumber;
}
void ValuesChangedCommand::removeSharedMemorys(const QVector<qint32> &keyNumberVector)
{
for (qint32 keyNumber : keyNumberVector) {
SharedMemory *sharedMemory = globalSharedMemoryContainer()->take(keyNumber);
delete sharedMemory;
}
}
void ValuesChangedCommand::sort()
{
std::sort(m_valueChangeVector.begin(), m_valueChangeVector.end());
}
static const QLatin1String valueKeyTemplateString("Values-%1");
static SharedMemory *createSharedMemory(qint32 key, int byteCount)
{
SharedMemory *sharedMemory = new SharedMemory(QString(valueKeyTemplateString).arg(key));
bool sharedMemoryIsCreated = sharedMemory->create(byteCount);
if (sharedMemoryIsCreated) {
globalSharedMemoryContainer()->insert(key, sharedMemory);
return sharedMemory;
} else {
delete sharedMemory;
}
return nullptr;
}
QDataStream &operator<<(QDataStream &out, const ValuesChangedCommand &command)
{
static const bool dontUseSharedMemory = qEnvironmentVariableIsSet("DESIGNER_DONT_USE_SHARED_MEMORY");
QVector<PropertyValueContainer> propertyValueContainer = command.valueChanges();
if (command.transactionOption != ValuesChangedCommand::TransactionOption::None) {
PropertyValueContainer optionContainer(command.transactionOption);
propertyValueContainer.append(optionContainer);
}
if (!dontUseSharedMemory && propertyValueContainer.count() > 5) {
static quint32 keyCounter = 0;
++keyCounter;
command.m_keyNumber = keyCounter;
QByteArray outDataStreamByteArray;
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
QDataStream temporaryOutDataStream(&outDataStreamByteArray, QIODevice::WriteOnly);
#else
QDataStream temporaryOutDataStream(&outDataStreamByteArray, QDataStream::WriteOnly);
#endif
temporaryOutDataStream.setVersion(QDataStream::Qt_4_8);
temporaryOutDataStream << propertyValueContainer;
SharedMemory *sharedMemory = createSharedMemory(keyCounter, outDataStreamByteArray.size());
if (sharedMemory) {
sharedMemory->lock();
std::memcpy(sharedMemory->data(), outDataStreamByteArray.constData(), sharedMemory->size());
sharedMemory->unlock();
out << command.keyNumber();
return out;
}
}
out << qint32(0);
out << propertyValueContainer;
return out;
}
void readSharedMemory(qint32 key, QVector<PropertyValueContainer> *valueChangeVector)
{
SharedMemory sharedMemory(QString(valueKeyTemplateString).arg(key));
bool canAttach = sharedMemory.attach(QSharedMemory::ReadOnly);
if (canAttach) {
sharedMemory.lock();
QDataStream in(QByteArray::fromRawData(static_cast<const char*>(sharedMemory.constData()), sharedMemory.size()));
in.setVersion(QDataStream::Qt_4_8);
in >> *valueChangeVector;
sharedMemory.unlock();
sharedMemory.detach();
}
}
QDataStream &operator>>(QDataStream &in, ValuesChangedCommand &command)
{
in >> command.m_keyNumber;
QVector<PropertyValueContainer> valueChangeVector;
if (command.keyNumber() > 0)
readSharedMemory(command.keyNumber(), &valueChangeVector);
else
in >> valueChangeVector;
// '-option-' is not a valid property name and indicates that we store the transaction option.
if (!valueChangeVector.isEmpty() && valueChangeVector.last().name() == "-option-") {
command.transactionOption =
static_cast<ValuesChangedCommand::TransactionOption>(valueChangeVector.last().instanceId());
valueChangeVector.removeLast();
}
command.m_valueChangeVector = valueChangeVector;
return in;
}
bool operator ==(const ValuesChangedCommand &first, const ValuesChangedCommand &second)
{
return first.m_valueChangeVector == second.m_valueChangeVector
&& first.transactionOption == second.transactionOption;
}
QDebug operator <<(QDebug debug, const ValuesChangedCommand &command)
{
return debug.nospace() << "ValuesChangedCommand("
<< "keyNumber: " << command.keyNumber() << ", "
<< command.valueChanges() << ")";
}
QDataStream &operator<<(QDataStream &out, const ValuesModifiedCommand &command)
{
return out << static_cast<const ValuesChangedCommand &>(command);
}
QDataStream &operator>>(QDataStream &in, ValuesModifiedCommand &command)
{
return in >> static_cast<ValuesChangedCommand &>(command);
}
} // namespace QmlDesigner
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