From 60514ebd866c8c49e90e501198588e2806c5fe7b Mon Sep 17 00:00:00 2001 From: Christian Mollekopf Date: Sun, 26 Jul 2015 11:21:29 +0200 Subject: Moved storage access, adaptor conversion and index access to central place --- common/entitystorage.h | 175 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 common/entitystorage.h (limited to 'common/entitystorage.h') diff --git a/common/entitystorage.h b/common/entitystorage.h new file mode 100644 index 0000000..6a41e0e --- /dev/null +++ b/common/entitystorage.h @@ -0,0 +1,175 @@ +/* + * Copyright (C) 2014 Christian Mollekopf + * + * 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 "clientapi.h" + +#include + +#include "domainadaptor.h" +#include "entitybuffer.h" +#include "log.h" +#include "storage.h" +#include "resultset.h" + +/** + * Wraps storage, entity adaptor factory and indexes into one. + */ +template +class EntityStorage +{ + +public: + EntityStorage(const QByteArray &instanceIdentifier, const DomainTypeAdaptorFactoryInterface::Ptr &adaptorFactory) + : mResourceInstanceIdentifier(instanceIdentifier), + mDomainTypeAdaptorFactory(adaptorFactory) + { + + } + +private: + static void scan(const QSharedPointer &storage, const QByteArray &key, std::function 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); + + //FIXME implement buffer.isValid() + // const auto resourceBuffer = Akonadi2::EntityBuffer::readBuffer(buffer.entity().resource()); + // const auto localBuffer = Akonadi2::EntityBuffer::readBuffer(buffer.entity().local()); + // const auto metadataBuffer = Akonadi2::EntityBuffer::readBuffer(buffer.entity().metadata()); + + // if ((!resourceBuffer && !localBuffer) || !metadataBuffer) { + // qWarning() << "invalid buffer " << QByteArray::fromRawData(static_cast(keyValue), keySize); + // return true; + // } + return callback(QByteArray::fromRawData(static_cast(keyValue), keySize), buffer.entity()); + }, + [](const Akonadi2::Storage::Error &error) { + qWarning() << "Error during query: " << error.message; + }); + } + + static void readValue(const QSharedPointer &storage, const QByteArray &key, const std::function &resultCallback, const DomainTypeAdaptorFactoryInterface::Ptr &adaptorFactory, const QByteArray &instanceIdentifier) + { + scan(storage, key, [=](const QByteArray &key, const Akonadi2::Entity &entity) { + const auto metadataBuffer = Akonadi2::EntityBuffer::readBuffer(entity.metadata()); + 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 domainObject = QSharedPointer::create(instanceIdentifier, key, revision, adaptorFactory->createAdaptor(entity)); + resultCallback(domainObject); + return true; + }); + } + + static ResultSet fullScan(const QSharedPointer &storage) + { + //TODO use a result set with an iterator, to read values on demand + QVector keys; + scan(storage, QByteArray(), [=, &keys](const QByteArray &key, const Akonadi2::Entity &) { + keys << key; + return true; + }); + Trace() << "Full scan found " << keys.size() << " results"; + return ResultSet(keys); + } + + static ResultSet filteredSet(const ResultSet &resultSet, const std::function &filter, const QSharedPointer &storage, const DomainTypeAdaptorFactoryInterface::Ptr &adaptorFactory, qint64 baseRevision, qint64 topRevision, const QByteArray &instanceIdentifier) + { + auto resultSetPtr = QSharedPointer::create(resultSet); + + //Read through the source values and return whatever matches the filter + std::function)> generator = [resultSetPtr, storage, adaptorFactory, filter, instanceIdentifier](std::function callback) -> bool { + while (resultSetPtr->next()) { + readValue(storage, resultSetPtr->id(), [filter, callback](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject) { + if (filter(domainObject)) { + callback(domainObject); + } + }, adaptorFactory, instanceIdentifier); + } + return false; + }; + return ResultSet(generator); + } + + static ResultSet getResultSet(const Akonadi2::Query &query, const QSharedPointer &storage, const DomainTypeAdaptorFactoryInterface::Ptr &adaptorFactory, const QByteArray &resourceInstanceIdentifier, qint64 baseRevision, qint64 topRevision) + { + QSet appliedFilters; + ResultSet resultSet = Akonadi2::ApplicationDomain::TypeImplementation::queryIndexes(query, resourceInstanceIdentifier, appliedFilters, qMakePair(baseRevision, topRevision)); + const auto remainingFilters = query.propertyFilter.keys().toSet() - appliedFilters; + + //We do a full scan if there were no indexes available to create the initial set. + if (appliedFilters.isEmpty()) { + resultSet = fullScan(storage); + } + + auto filter = [remainingFilters, query, baseRevision, topRevision](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject) -> bool { + if (topRevision > 0) { + Trace() << "filtering by revision " << domainObject->revision(); + if (domainObject->revision() < baseRevision || domainObject->revision() > topRevision) { + return false; + } + } + for (const auto &filterProperty : remainingFilters) { + //TODO implement other comparison operators than equality + if (domainObject->getProperty(filterProperty) != query.propertyFilter.value(filterProperty)) { + return false; + } + } + return true; + }; + + return filteredSet(resultSet, filter, storage, adaptorFactory, baseRevision, topRevision, resourceInstanceIdentifier); + } + +public: + + void read(const Akonadi2::Query &query, const QPair &revisionRange, const QSharedPointer > &resultProvider) + { + auto storage = QSharedPointer::create(Akonadi2::Store::storageLocation(), mResourceInstanceIdentifier); + 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 + + Log() << "Querying" << revisionRange.first << revisionRange.second; + auto resultSet = getResultSet(query, storage, mDomainTypeAdaptorFactory, mResourceInstanceIdentifier, revisionRange.first, revisionRange.second); + auto resultCallback = std::bind(&Akonadi2::ResultProvider::add, resultProvider, std::placeholders::_1); + while(resultSet.next([resultCallback](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &value) -> bool { + resultCallback(Akonadi2::ApplicationDomain::ApplicationDomainType::getInMemoryRepresentation(*value)); + return true; + })){}; + //TODO replay removals and modifications + storage->abortTransaction(); + } + +private: + DomainTypeAdaptorFactoryInterface::Ptr mDomainTypeAdaptorFactory; + QByteArray mResourceInstanceIdentifier; +}; -- cgit v1.2.3