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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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-3.0.html.
**
****************************************************************************/
#include "qtcassert.h"
#include "singleton.h"
#include <QCoreApplication>
#include <QList>
#include <QThread>
#include <unordered_map>
using namespace Utils;
namespace Utils {
// The order of elements reflects dependencies, i.e.
// if B requires A then B will follow A on this list
static QList<Singleton *> s_singletonList;
static QMutex s_mutex;
static std::unordered_map<std::type_index, SingletonStaticData> s_staticDataList;
Singleton::~Singleton()
{
QMutexLocker locker(&s_mutex);
s_singletonList.removeAll(this);
}
void Singleton::addSingleton(Singleton *singleton)
{
QMutexLocker locker(&s_mutex);
s_singletonList.append(singleton);
}
SingletonStaticData &Singleton::staticData(std::type_index index)
{
QMutexLocker locker(&s_mutex);
return s_staticDataList[index];
}
// Note: it's caller responsibility to ensure that this function is being called when all other
// threads don't use any singleton. As a good practice: finish all other threads that were using
// singletons before this function is called.
// Some singletons may work only in main thread, so this method should be called from main thread
// only.
void Singleton::deleteAll()
{
QTC_ASSERT(QThread::currentThread() == qApp->thread(), return);
QList<Singleton *> oldList;
{
QMutexLocker locker(&s_mutex);
oldList = s_singletonList;
s_singletonList = {};
}
// Keep the reverse order when deleting
while (!oldList.isEmpty())
delete oldList.takeLast();
}
} // namespace Utils
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