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/*
* Copyright (C) 2014 Christian Mollekopf <chrigi_1@fastmail.fm>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "sink_export.h"
#include <QByteArray>
#include <QDebug>
#include <QMutex>
#include <functional>
#include <memory>
#include "facadeinterface.h"
#include "applicationdomaintype.h"
#include "resourcecontext.h"
#include "log.h"
namespace Sink {
/**
* Facade factory that returns a store facade implementation, by loading a plugin and providing the relevant implementation.
*
* If we were to provide default implementations for certain capabilities. Here would be the place to do so.
*/
class SINK_EXPORT FacadeFactory
{
public:
typedef std::function<std::shared_ptr<void>(const ResourceContext &)> FactoryFunction;
void registerStaticFacades();
static FacadeFactory &instance();
static QByteArray key(const QByteArray &resource, const QByteArray &type);
template <class DomainType, class Facade>
void registerFacade(const QByteArray &resource)
{
registerFacade(resource, [](const ResourceContext &context) { return std::make_shared<Facade>(context); }, ApplicationDomain::getTypeName<DomainType>());
}
template <class DomainType, class Facade>
void registerFacade()
{
registerFacade(QByteArray(), [](const ResourceContext &) { return std::make_shared<Facade>(); }, ApplicationDomain::getTypeName<DomainType>());
}
/*
* Allows the registrar to register a specific instance.
*
* Primarily for testing.
*/
template <class DomainType, class Facade>
void registerFacade(const QByteArray &resource, const FactoryFunction &customFactoryFunction)
{
registerFacade(resource, customFactoryFunction, ApplicationDomain::getTypeName<DomainType>());
}
/*
* Can be used to clear the factory.
*
* Primarily for testing.
*/
void resetFactory();
template <class DomainType>
std::shared_ptr<StoreFacade<DomainType>> getFacade(const QByteArray &resource, const QByteArray &instanceIdentifier)
{
const QByteArray typeName = ApplicationDomain::getTypeName<DomainType>();
const auto ptr = getFacade(resource, instanceIdentifier, typeName);
//We have to check the pointer before the cast, otherwise a check would return true also for invalid instances.
if (!ptr) {
return std::shared_ptr<StoreFacade<DomainType>>();
}
return std::static_pointer_cast<StoreFacade<DomainType>>(ptr);
}
template <class DomainType>
std::shared_ptr<StoreFacade<DomainType>> getFacade()
{
return getFacade<DomainType>(QByteArray(), QByteArray());
}
private:
FacadeFactory();
std::shared_ptr<void> getFacade(const QByteArray &resource, const QByteArray &instanceIdentifier, const QByteArray &typeName);
void registerFacade(const QByteArray &resource, const FactoryFunction &customFactoryFunction, const QByteArray typeName);
QHash<QByteArray, FactoryFunction> mFacadeRegistry;
static QMutex sMutex;
};
}
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