From ef8fcadb0c0ad4af055262a4dd9c37d4905cc0fa Mon Sep 17 00:00:00 2001 From: Christian Mollekopf Date: Thu, 2 Jul 2015 12:08:48 +0200 Subject: Generalized facade code. A default implementation is now nothing but an empty shell. --- common/facade.h | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 126 insertions(+), 2 deletions(-) (limited to 'common') diff --git a/common/facade.h b/common/facade.h index d9ec0c9..e32ee96 100644 --- a/common/facade.h +++ b/common/facade.h @@ -31,6 +31,8 @@ #include "domainadaptor.h" #include "entitybuffer.h" #include "log.h" +#include "storage.h" +#include "resultset.h" /** * A QueryRunner runs a query and updates the corresponding result set. @@ -107,7 +109,8 @@ public: GenericFacade(const QByteArray &resourceIdentifier, const QSharedPointer > &adaptorFactory = QSharedPointer >()) : Akonadi2::StoreFacade(), mResourceAccess(new ResourceAccess(resourceIdentifier)), - mDomainTypeAdaptorFactory(adaptorFactory) + mDomainTypeAdaptorFactory(adaptorFactory), + mResourceInstanceIdentifier(resourceIdentifier) { } @@ -214,12 +217,133 @@ protected: return KAsync::null(); } - virtual KAsync::Job load(const Akonadi2::Query &query, const QSharedPointer > &resultProvider, qint64 oldRevision, qint64 newRevision) { return KAsync::null(); }; + 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 QSharedPointer > &adaptorFactory) + { + 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("org.kde.dummy.instance1", 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; + }); + return ResultSet(keys); + } + + static ResultSet filteredSet(const ResultSet &resultSet, const std::function &filter, const QSharedPointer &storage, const QSharedPointer > &adaptorFactory) + { + auto resultSetPtr = QSharedPointer::create(resultSet); + + //Read through the source values and return whatever matches the filter + std::function)> generator = [resultSetPtr, storage, adaptorFactory, filter](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); + } + return false; + }; + return ResultSet(generator); + } + static ResultSet getResultSet(const Akonadi2::Query &query, const QSharedPointer &storage, const QSharedPointer > &adaptorFactory, const QByteArray &resourceInstanceIdentifier) + { + QSet appliedFilters; + ResultSet resultSet = Akonadi2::ApplicationDomain::TypeImplementation::queryIndexes(query, resourceInstanceIdentifier, 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. + if (appliedFilters.isEmpty()) { + resultSet = fullScan(storage); + } + + auto filter = [remainingFilters, query](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject) -> bool { + 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); + } + + virtual KAsync::Job load(const Akonadi2::Query &query, const QSharedPointer > &resultProvider, qint64 oldRevision, qint64 newRevision) + { + return KAsync::start([=]() -> qint64 { + 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 + const qint64 revision = storage->maxRevision(); + + auto resultSet = getResultSet(query, storage, mDomainTypeAdaptorFactory, mResourceInstanceIdentifier); + + // TODO only emit changes and don't replace everything + resultProvider->clear(); + 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; + })){}; + storage->abortTransaction(); + return revision; + }); + } + +private: protected: //TODO use one resource access instance per application => make static QSharedPointer mResourceAccess; QSharedPointer > mDomainTypeAdaptorFactory; + QByteArray mResourceInstanceIdentifier; }; } -- cgit v1.2.3