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/*
Copyright (c) 2015 Christian Mollekopf <mollekopf@kolabsys.com>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#pragma once
#include <QObject>
#include "facadeinterface.h"
#include "resourceaccess.h"
#include "resultprovider.h"
#include "domaintypeadaptorfactoryinterface.h"
#include "storage.h"
#include "query.h"
/**
* A QueryRunner runs a query and updates the corresponding result set.
*
* The lifetime of the QueryRunner is defined by the resut set (otherwise it's doing useless work),
* and by how long a result set must be updated. If the query is one off the runner dies after the execution,
* otherwise it lives on the react to changes and updates the corresponding result set.
*
* QueryRunner has to keep ResourceAccess alive in order to keep getting updates.
*/
class QueryRunnerBase : public QObject
{
Q_OBJECT
protected:
typedef std::function<KAsync::Job<void>()> QueryFunction;
/**
* Set the query to run
*/
void setQuery(const QueryFunction &query)
{
queryFunction = query;
}
protected slots:
/**
* Rerun query with new revision
*/
void revisionChanged(qint64 newRevision)
{
Trace() << "New revision: " << newRevision;
run().exec();
}
private:
/**
* Starts query
*/
KAsync::Job<void> run(qint64 newRevision = 0)
{
return queryFunction();
}
QueryFunction queryFunction;
};
template<typename DomainType>
class QueryRunner : public QueryRunnerBase
{
public:
QueryRunner(const Akonadi2::Query &query, const Akonadi2::ResourceAccessInterface::Ptr &, const QByteArray &instanceIdentifier, const DomainTypeAdaptorFactoryInterface::Ptr &, const QByteArray &bufferType);
virtual ~QueryRunner();
typename Akonadi2::ResultEmitter<typename DomainType::Ptr>::Ptr emitter();
private:
static void replaySet(ResultSet &resultSet, Akonadi2::ResultProviderInterface<typename DomainType::Ptr> &resultProvider);
void readEntity(const Akonadi2::Storage::NamedDatabase &db, const QByteArray &key, const std::function<void(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &, Akonadi2::Operation)> &resultCallback);
ResultSet loadInitialResultSet(const Akonadi2::Query &query, Akonadi2::Storage::Transaction &transaction, QSet<QByteArray> &remainingFilters);
ResultSet loadIncrementalResultSet(qint64 baseRevision, const Akonadi2::Query &query, Akonadi2::Storage::Transaction &transaction, QSet<QByteArray> &remainingFilters);
ResultSet filterSet(const ResultSet &resultSet, const std::function<bool(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject)> &filter, const Akonadi2::Storage::NamedDatabase &db, bool initialQuery);
std::function<bool(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject)> getFilter(const QSet<QByteArray> remainingFilters, const Akonadi2::Query &query);
qint64 load(const Akonadi2::Query &query, const std::function<ResultSet(Akonadi2::Storage::Transaction &, QSet<QByteArray> &)> &baseSetRetriever, Akonadi2::ResultProviderInterface<typename DomainType::Ptr> &resultProvider, bool initialQuery);
qint64 executeIncrementalQuery(const Akonadi2::Query &query, Akonadi2::ResultProviderInterface<typename DomainType::Ptr> &resultProvider);
qint64 executeInitialQuery(const Akonadi2::Query &query, const typename DomainType::Ptr &parent, Akonadi2::ResultProviderInterface<typename DomainType::Ptr> &resultProvider);
private:
QSharedPointer<Akonadi2::ResultProvider<typename DomainType::Ptr> > mResultProvider;
QSharedPointer<Akonadi2::ResourceAccessInterface> mResourceAccess;
DomainTypeAdaptorFactoryInterface::Ptr mDomainTypeAdaptorFactory;
QByteArray mResourceInstanceIdentifier;
QByteArray mBufferType;
Akonadi2::Query mQuery;
};
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