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/*
* Copyright (C) 2016 Christian Mollekopf <mollekopf@kolabsys.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "synchronizer.h"
#include "definitions.h"
#include "commands.h"
#include "bufferutils.h"
#include "entitystore.h"
#include "remoteidmap.h"
#include "adaptorfactoryregistry.h"
#include "createentity_generated.h"
#include "modifyentity_generated.h"
#include "deleteentity_generated.h"
using namespace Sink;
Synchronizer::Synchronizer(const QByteArray &resourceType, const QByteArray &resourceInstanceIdentifier)
: mStorage(Sink::storageLocation(), resourceInstanceIdentifier, Sink::Storage::ReadOnly),
mSyncStorage(Sink::storageLocation(), resourceInstanceIdentifier + ".synchronization", Sink::Storage::ReadWrite),
mResourceType(resourceType),
mResourceInstanceIdentifier(resourceInstanceIdentifier)
{
Trace() << "Starting synchronizer: " << resourceType << resourceInstanceIdentifier;
}
void Synchronizer::setup(const std::function<void(int commandId, const QByteArray &data)> &enqueueCommandCallback)
{
mEnqueue = enqueueCommandCallback;
}
void Synchronizer::enqueueCommand(int commandId, const QByteArray &data)
{
Q_ASSERT(mEnqueue);
mEnqueue(commandId, data);
}
EntityStore &Synchronizer::store()
{
if (!mEntityStore) {
mEntityStore = QSharedPointer<EntityStore>::create(mResourceType, mResourceInstanceIdentifier, transaction());
}
return *mEntityStore;
}
RemoteIdMap &Synchronizer::syncStore()
{
if (!mSyncStore) {
mSyncStore = QSharedPointer<RemoteIdMap>::create(syncTransaction());
}
return *mSyncStore;
}
void Synchronizer::createEntity(const QByteArray &sinkId, const QByteArray &bufferType, const Sink::ApplicationDomain::ApplicationDomainType &domainObject,
DomainTypeAdaptorFactoryInterface &adaptorFactory, std::function<void(const QByteArray &)> callback)
{
// These changes are coming from the source
const auto replayToSource = false;
flatbuffers::FlatBufferBuilder entityFbb;
adaptorFactory.createBuffer(domainObject, entityFbb);
flatbuffers::FlatBufferBuilder fbb;
// This is the resource type and not the domain type
auto entityId = fbb.CreateString(sinkId.toStdString());
auto type = fbb.CreateString(bufferType.toStdString());
auto delta = Sink::EntityBuffer::appendAsVector(fbb, entityFbb.GetBufferPointer(), entityFbb.GetSize());
auto location = Sink::Commands::CreateCreateEntity(fbb, entityId, type, delta, replayToSource);
Sink::Commands::FinishCreateEntityBuffer(fbb, location);
callback(BufferUtils::extractBuffer(fbb));
}
void Synchronizer::modifyEntity(const QByteArray &sinkId, qint64 revision, const QByteArray &bufferType, const Sink::ApplicationDomain::ApplicationDomainType &domainObject,
DomainTypeAdaptorFactoryInterface &adaptorFactory, std::function<void(const QByteArray &)> callback)
{
// These changes are coming from the source
const auto replayToSource = false;
flatbuffers::FlatBufferBuilder entityFbb;
adaptorFactory.createBuffer(domainObject, entityFbb);
flatbuffers::FlatBufferBuilder fbb;
auto entityId = fbb.CreateString(sinkId.toStdString());
// This is the resource type and not the domain type
auto type = fbb.CreateString(bufferType.toStdString());
auto delta = Sink::EntityBuffer::appendAsVector(fbb, entityFbb.GetBufferPointer(), entityFbb.GetSize());
// FIXME removals
auto location = Sink::Commands::CreateModifyEntity(fbb, revision, entityId, 0, type, delta, replayToSource);
Sink::Commands::FinishModifyEntityBuffer(fbb, location);
callback(BufferUtils::extractBuffer(fbb));
}
void Synchronizer::deleteEntity(const QByteArray &sinkId, qint64 revision, const QByteArray &bufferType, std::function<void(const QByteArray &)> callback)
{
// These changes are coming from the source
const auto replayToSource = false;
flatbuffers::FlatBufferBuilder fbb;
auto entityId = fbb.CreateString(sinkId.toStdString());
// This is the resource type and not the domain type
auto type = fbb.CreateString(bufferType.toStdString());
auto location = Sink::Commands::CreateDeleteEntity(fbb, revision, entityId, type, replayToSource);
Sink::Commands::FinishDeleteEntityBuffer(fbb, location);
callback(BufferUtils::extractBuffer(fbb));
}
void Synchronizer::scanForRemovals(const QByteArray &bufferType, const std::function<void(const std::function<void(const QByteArray &key)> &callback)> &entryGenerator, std::function<bool(const QByteArray &remoteId)> exists)
{
entryGenerator([this, bufferType, &exists](const QByteArray &key) {
auto sinkId = Sink::Storage::uidFromKey(key);
const auto remoteId = syncStore().resolveLocalId(bufferType, sinkId);
Trace() << "Checking for removal " << key << remoteId;
// If we have no remoteId, the entity hasn't been replayed to the source yet
if (!remoteId.isEmpty()) {
if (!exists(remoteId)) {
Trace() << "Found a removed entity: " << sinkId;
deleteEntity(sinkId, Sink::Storage::maxRevision(transaction()), bufferType,
[this](const QByteArray &buffer) { enqueueCommand(Sink::Commands::DeleteEntityCommand, buffer); });
}
}
});
}
void Synchronizer::createOrModify(const QByteArray &bufferType, const QByteArray &remoteId, const Sink::ApplicationDomain::ApplicationDomainType &entity)
{
Trace() << "Create or modify" << bufferType << remoteId;
auto mainDatabase = Storage::mainDatabase(transaction(), bufferType);
const auto sinkId = syncStore().resolveRemoteId(bufferType, remoteId);
const auto found = mainDatabase.contains(sinkId);
auto adaptorFactory = Sink::AdaptorFactoryRegistry::instance().getFactory(mResourceType, bufferType);
if (!found) {
Trace() << "Found a new entity: " << remoteId;
createEntity(
sinkId, bufferType, entity, *adaptorFactory, [this](const QByteArray &buffer) { enqueueCommand(Sink::Commands::CreateEntityCommand, buffer); });
} else { // modification
qint64 retrievedRevision = 0;
if (auto current = EntityReaderUtils::getLatest(mainDatabase, sinkId, *adaptorFactory, retrievedRevision)) {
bool changed = false;
for (const auto &property : entity.changedProperties()) {
if (entity.getProperty(property) != current->getProperty(property)) {
Trace() << "Property changed " << sinkId << property;
changed = true;
}
}
if (changed) {
Trace() << "Found a modified entity: " << remoteId;
modifyEntity(sinkId, Sink::Storage::maxRevision(transaction()), bufferType, entity, *adaptorFactory,
[this](const QByteArray &buffer) { enqueueCommand(Sink::Commands::ModifyEntityCommand, buffer); });
}
} else {
Warning() << "Failed to get current entity";
}
}
}
KAsync::Job<void> Synchronizer::synchronize()
{
Trace() << "Synchronizing";
return synchronizeWithSource().then<void>([this]() {
mSyncStore.clear();
mEntityStore.clear();
});
}
void Synchronizer::commit()
{
mTransaction.abort();
mEntityStore.clear();
}
void Synchronizer::commitSync()
{
mSyncTransaction.commit();
mSyncStore.clear();
}
Sink::Storage::Transaction &Synchronizer::transaction()
{
if (!mTransaction) {
Trace() << "Starting transaction";
mTransaction = mStorage.createTransaction(Sink::Storage::ReadOnly);
}
return mTransaction;
}
Sink::Storage::Transaction &Synchronizer::syncTransaction()
{
if (!mSyncTransaction) {
Trace() << "Starting transaction";
mSyncTransaction = mSyncStorage.createTransaction(Sink::Storage::ReadWrite);
}
return mSyncTransaction;
}
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