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/*
* Copyright (C) 2016 Christian Mollekopf <chrigi_1@fastmail.fm>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include "query.h"
#include "resultset.h"
#include "log.h"
#include "storage/entitystore.h"
class Source;
class Bloom;
class Reduce;
class Filter;
class FilterBase;
class DataStoreQuery {
friend class FilterBase;
friend class Source;
friend class Bloom;
friend class Reduce;
friend class Filter;
public:
typedef QSharedPointer<DataStoreQuery> Ptr;
struct State {
typedef QSharedPointer<State> Ptr;
QSharedPointer<FilterBase> mCollector;
QSharedPointer<Source> mSource;
};
DataStoreQuery(const Sink::QueryBase &query, const QByteArray &type, Sink::Storage::EntityStore &store);
DataStoreQuery(const DataStoreQuery::State &state, const QByteArray &type, Sink::Storage::EntityStore &store, bool incremental);
~DataStoreQuery();
ResultSet execute();
ResultSet update(qint64 baseRevision);
void updateComplete();
State::Ptr getState();
private:
typedef std::function<bool(const Sink::ApplicationDomain::ApplicationDomainType &entity, Sink::Operation)> FilterFunction;
typedef std::function<void(const Sink::ApplicationDomain::ApplicationDomainType &entity, Sink::Operation)> BufferCallback;
QVector<QByteArray> indexLookup(const QByteArray &property, const QVariant &value);
void readEntity(const QByteArray &key, const BufferCallback &resultCallback);
ResultSet createFilteredSet(ResultSet &resultSet, const FilterFunction &);
QVector<QByteArray> loadIncrementalResultSet(qint64 baseRevision);
void setupQuery(const Sink::QueryBase &query_);
QByteArrayList executeSubquery(const Sink::QueryBase &subquery);
const QByteArray mType;
QSharedPointer<FilterBase> mCollector;
QSharedPointer<Source> mSource;
Sink::Storage::EntityStore &mStore;
Sink::Log::Context mLogCtx;
};
class FilterBase {
public:
typedef QSharedPointer<FilterBase> Ptr;
FilterBase(DataStoreQuery *store)
: mDatastore(store)
{
}
FilterBase(FilterBase::Ptr source, DataStoreQuery *store)
: mSource(source),
mDatastore(store)
{
}
virtual ~FilterBase(){}
void readEntity(const QByteArray &key, const std::function<void(const Sink::ApplicationDomain::ApplicationDomainType &entity, Sink::Operation)> &callback)
{
Q_ASSERT(mDatastore);
mDatastore->readEntity(key, callback);
}
QVector<QByteArray> indexLookup(const QByteArray &property, const QVariant &value)
{
Q_ASSERT(mDatastore);
return mDatastore->indexLookup(property, value);
}
virtual void skip() { mSource->skip(); }
//Returns true for as long as a result is available
virtual bool next(const std::function<void(const ResultSet::Result &)> &callback) = 0;
virtual void updateComplete() { }
FilterBase::Ptr mSource;
DataStoreQuery *mDatastore;
bool mIncremental = false;
};
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