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/*
* Copyright (C) 2014 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.
*/
#include "facade.h"
#include <QDebug>
#include <functional>
#include "common/resourceaccess.h"
#include "common/commands.h"
#include "common/resultset.h"
#include "common/domain/event.h"
#include "dummycalendar_generated.h"
#include "event_generated.h"
#include "entity_generated.h"
#include "metadata_generated.h"
#include "domainadaptor.h"
#include <common/entitybuffer.h>
#include <common/index.h>
#include <common/log.h>
using namespace DummyCalendar;
using namespace flatbuffers;
DummyResourceFacade::DummyResourceFacade()
: Akonadi2::GenericFacade<Akonadi2::ApplicationDomain::Event>("org.kde.dummy.instance1", QSharedPointer<DummyEventAdaptorFactory>::create())
{
}
DummyResourceFacade::~DummyResourceFacade()
{
}
static void scan(const QSharedPointer<Akonadi2::Storage> &storage, const QByteArray &key, std::function<bool(const QByteArray &key, const Akonadi2::Entity &entity, DummyEvent const *buffer, Akonadi2::ApplicationDomain::Buffer::Event const *local, Akonadi2::Metadata const *metadata)> callback)
{
storage->scan(key, [=](void *keyValue, int keySize, void *dataValue, int dataSize) -> bool {
//Skip internals
if (Akonadi2::Storage::isInternalKey(keyValue, keySize)) {
return true;
}
//Extract buffers
Akonadi2::EntityBuffer buffer(dataValue, dataSize);
const auto resourceBuffer = Akonadi2::EntityBuffer::readBuffer<DummyEvent>(buffer.entity().resource());
const auto localBuffer = Akonadi2::EntityBuffer::readBuffer<Akonadi2::ApplicationDomain::Buffer::Event>(buffer.entity().local());
const auto metadataBuffer = Akonadi2::EntityBuffer::readBuffer<Akonadi2::Metadata>(buffer.entity().metadata());
if ((!resourceBuffer && !localBuffer) || !metadataBuffer) {
qWarning() << "invalid buffer " << QByteArray::fromRawData(static_cast<char*>(keyValue), keySize);
return true;
}
return callback(QByteArray::fromRawData(static_cast<char*>(keyValue), keySize), buffer.entity(), resourceBuffer, localBuffer, metadataBuffer);
},
[](const Akonadi2::Storage::Error &error) {
qWarning() << "Error during query: " << error.message;
});
}
static void readValue(const QSharedPointer<Akonadi2::Storage> &storage, const QByteArray &key, const std::function<void(const Akonadi2::ApplicationDomain::Event::Ptr &)> &resultCallback, const QSharedPointer<DomainTypeAdaptorFactoryInterface<Akonadi2::ApplicationDomain::Event> > &adaptorFactory)
{
scan(storage, key, [=](const QByteArray &key, const Akonadi2::Entity &entity, DummyEvent const *buffer, Akonadi2::ApplicationDomain::Buffer::Event const *local, Akonadi2::Metadata const *metadataBuffer) {
qint64 revision = metadataBuffer ? metadataBuffer->revision() : -1;
//This only works for a 1:1 mapping of resource to domain types.
//Not i.e. for tags that are stored as flags in each entity of an imap store.
//additional properties that don't have a 1:1 mapping (such as separately stored tags),
//could be added to the adaptor
auto event = QSharedPointer<Akonadi2::ApplicationDomain::Event>::create("org.kde.dummy.instance1", key, revision, adaptorFactory->createAdaptor(entity));
resultCallback(event);
return true;
});
}
static ResultSet getResultSet(const Akonadi2::Query &query, const QSharedPointer<Akonadi2::Storage> &storage, const QSharedPointer<DomainTypeAdaptorFactoryInterface<Akonadi2::ApplicationDomain::Event> > &adaptorFactory)
{
QSet<QByteArray> appliedFilters;
ResultSet resultSet = Akonadi2::ApplicationDomain::TypeImplementation<Akonadi2::ApplicationDomain::Event>::queryIndexes(query, "org.kde.dummy.instance1", appliedFilters);
const auto remainingFilters = query.propertyFilter.keys().toSet() - appliedFilters;
//We do a full scan if there were no indexes available to create the initial set.
//TODO use a result set with an iterator, to read values on demand
if (appliedFilters.isEmpty()) {
QVector<QByteArray> keys;
scan(storage, QByteArray(), [=, &keys](const QByteArray &key, const Akonadi2::Entity &entity, DummyEvent const *buffer, Akonadi2::ApplicationDomain::Buffer::Event const *local, Akonadi2::Metadata const *metadataBuffer) {
keys << key;
return true;
});
resultSet = ResultSet(keys);
}
auto filter = [remainingFilters, query](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &event) -> bool {
for (const auto &filterProperty : remainingFilters) {
//TODO implement other comparison operators than equality
if (event->getProperty(filterProperty) != query.propertyFilter.value(filterProperty)) {
return false;
}
}
return true;
};
auto resultSetPtr = QSharedPointer<ResultSet>::create(resultSet);
//Read through the source values and return whatever matches the filter
std::function<bool(std::function<void(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &)>)> generator = [resultSetPtr, storage, adaptorFactory, filter](std::function<void(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &)> callback) -> bool {
while (resultSetPtr->next()) {
Akonadi2::ApplicationDomain::Event::Ptr event;
readValue(storage, resultSetPtr->id(), [filter, callback](const Akonadi2::ApplicationDomain::Event::Ptr &event) {
if (filter(event)) {
callback(event);
}
}, adaptorFactory);
}
return false;
};
return ResultSet(generator);
}
//TODO generalize
KAsync::Job<qint64> DummyResourceFacade::load(const Akonadi2::Query &query, const QSharedPointer<Akonadi2::ResultProvider<Akonadi2::ApplicationDomain::Event::Ptr> > &resultProvider, qint64 oldRevision, qint64 newRevision)
{
return KAsync::start<qint64>([=]() {
auto storage = QSharedPointer<Akonadi2::Storage>::create(Akonadi2::Store::storageLocation(), "org.kde.dummy.instance1");
storage->setDefaultErrorHandler([](const Akonadi2::Storage::Error &error) {
Warning() << "Error during query: " << error.store << error.message;
});
storage->startTransaction(Akonadi2::Storage::ReadOnly);
//TODO start transaction on indexes as well
const qint64 revision = storage->maxRevision();
auto resultSet = getResultSet(query, storage, mDomainTypeAdaptorFactory);
// TODO only emit changes and don't replace everything
resultProvider->clear();
auto resultCallback = std::bind(&Akonadi2::ResultProvider<Akonadi2::ApplicationDomain::Event::Ptr>::add, resultProvider, std::placeholders::_1);
while(resultSet.next([resultCallback](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &value) -> bool {
resultCallback(Akonadi2::ApplicationDomain::ApplicationDomainType::getInMemoryRepresentation<Akonadi2::ApplicationDomain::Event>(value));
})){};
storage->abortTransaction();
return revision;
});
}
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