KisGlobalResourcesInterface.cpp

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/*
 *  SPDX-FileCopyrightText: 2020 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
#include "KisGlobalResourcesInterface.h"
 
#include <QGlobalStatic>
#include <KisResourceModel.h>
#include <KisResourceModelProvider.h>
 
#include <kis_debug.h>
 
#include <QBasicMutex>
#include <QMutexLocker>
 
 
namespace {
class GlobalResourcesSource : public KisResourcesInterface::ResourceSourceAdapter
{
public:
    GlobalResourcesSource(const QString &resourceType, KisAllResourcesModel *model)
        : KisResourcesInterface::ResourceSourceAdapter(resourceType)
        , m_model(model)
    {}
 
    ~GlobalResourcesSource() override
    {
    }
protected:
    QVector<KoResourceSP> resourcesForFilename(const QString &filename) const override {
        QVector<KoResourceSP> res = m_model->resourcesForFilename(filename);
        return res;
    }
 
    QVector<KoResourceSP> resourcesForName(const QString &name) const override {
        QVector<KoResourceSP> res = m_model->resourcesForName(name);
        return res;
    }
 
    QVector<KoResourceSP> resourcesForMD5(const QString &md5) const override {
        QVector<KoResourceSP> res = m_model->resourcesForMD5(md5);
        return res;
    }
public:
    KoResourceSP fallbackResource() const override {
        return m_model->rowCount() > 0 ? m_model->resourceForIndex(m_model->index(0, 0)) : KoResourceSP();
    }
 
private:
    KisAllResourcesModel *m_model;
};
}
 
KisResourcesInterfaceSP KisGlobalResourcesInterface::instance()
{
    // TODO: implement general macro like Q_GLOBAL_STATIC()
 
    static QBasicAtomicInt guard = Q_BASIC_ATOMIC_INITIALIZER(QtGlobalStatic::Uninitialized);
    static KisResourcesInterfaceSP d;
    static QBasicMutex mutex;
    int x = guard.loadAcquire();
    if (Q_UNLIKELY(x >= QtGlobalStatic::Uninitialized)) {
        QMutexLocker locker(&mutex);
        if (guard.loadRelaxed() == QtGlobalStatic::Uninitialized) {
            d.reset(new KisGlobalResourcesInterface());
            static struct Cleanup {
                ~Cleanup() {
                    d.reset();
                    guard.storeRelaxed(QtGlobalStatic::Destroyed);
                }
            } cleanup;
            guard.storeRelease(QtGlobalStatic::Initialized);
        }
    }
 
    return d;
}
 
KisResourcesInterface::ResourceSourceAdapter *KisGlobalResourcesInterface::createSourceImpl(const QString &type) const
{
    KisResourcesInterface::ResourceSourceAdapter *source =
        new GlobalResourcesSource(type, KisResourceModelProvider::resourceModel(type));
 
    KIS_ASSERT(source);
    return source;
}