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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "qtcassert.h"
#include "singleton.h"
#include "threadutils.h"
#include <QList>
#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(isMainThread(), 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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