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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 <Async/Async>
#include <QByteArray>
#include <QSharedPointer>
#include <QPair>
#include "applicationdomaintype.h"
#include "resultprovider.h"
namespace Sink {
class Query;
/**
* Interface for the store facade.
*
* All methods are synchronous.
* Facades are stateful (they hold connections to resources and database).
*
* TODO: would it make sense to split the write, read and notification parts? (we could potentially save some connections)
*/
template <class DomainType>
class StoreFacade
{
public:
virtual ~StoreFacade(){};
QByteArray type() const
{
return ApplicationDomain::getTypeName<DomainType>();
}
/**
* Create an entity in the store.
*
* The job returns succefully once the task has been successfully placed in the queue
*/
virtual KAsync::Job<void> create(const DomainType &domainObject) = 0;
/**
* Modify an entity in the store.
*
* The job returns succefully once the task has been successfully placed in the queue
*/
virtual KAsync::Job<void> modify(const DomainType &domainObject) = 0;
/**
* Remove an entity from the store.
*
* The job returns succefully once the task has been successfully placed in the queue
*/
virtual KAsync::Job<void> remove(const DomainType &domainObject) = 0;
/**
* Load entities from the store.
*/
virtual QPair<KAsync::Job<void>, typename Sink::ResultEmitter<typename DomainType::Ptr>::Ptr> load(const Query &query) = 0;
};
template <class DomainType>
class NullFacade : public StoreFacade<DomainType>
{
public:
virtual ~NullFacade(){};
KAsync::Job<void> create(const DomainType &domainObject)
{
return KAsync::error<void>(-1, "Failed to create a facade");
}
KAsync::Job<void> modify(const DomainType &domainObject)
{
return KAsync::error<void>(-1, "Failed to create a facade");
}
KAsync::Job<void> remove(const DomainType &domainObject)
{
return KAsync::error<void>(-1, "Failed to create a facade");
}
QPair<KAsync::Job<void>, typename Sink::ResultEmitter<typename DomainType::Ptr>::Ptr> load(const Query &query)
{
return qMakePair(KAsync::null<void>(), typename Sink::ResultEmitter<typename DomainType::Ptr>::Ptr());
}
};
}
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