| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "sync/engine/sync_directory_update_handler.h" |
| |
| #include "sync/engine/conflict_resolver.h" |
| #include "sync/engine/process_updates_util.h" |
| #include "sync/engine/update_applicator.h" |
| #include "sync/sessions/status_controller.h" |
| #include "sync/syncable/directory.h" |
| #include "sync/syncable/syncable_model_neutral_write_transaction.h" |
| #include "sync/syncable/syncable_write_transaction.h" |
| |
| namespace syncer { |
| |
| using syncable::SYNCER; |
| |
| SyncDirectoryUpdateHandler::SyncDirectoryUpdateHandler( |
| syncable::Directory* dir, |
| ModelType type, |
| scoped_refptr<ModelSafeWorker> worker) |
| : dir_(dir), |
| type_(type), |
| worker_(worker) {} |
| |
| SyncDirectoryUpdateHandler::~SyncDirectoryUpdateHandler() {} |
| |
| void SyncDirectoryUpdateHandler::GetDownloadProgress( |
| sync_pb::DataTypeProgressMarker* progress_marker) const { |
| dir_->GetDownloadProgress(type_, progress_marker); |
| } |
| |
| void SyncDirectoryUpdateHandler::ProcessGetUpdatesResponse( |
| const sync_pb::DataTypeProgressMarker& progress_marker, |
| const SyncEntityList& applicable_updates, |
| sessions::StatusController* status) { |
| syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir_); |
| UpdateSyncEntities(&trans, applicable_updates, status); |
| UpdateProgressMarker(progress_marker); |
| } |
| |
| void SyncDirectoryUpdateHandler::ApplyUpdates( |
| sessions::StatusController* status) { |
| if (IsControlType(type_)) { |
| return; // We don't process control types here. |
| } |
| |
| if (!dir_->TypeHasUnappliedUpdates(type_)) { |
| return; // No work to do. Skip this type. |
| } |
| |
| WorkCallback c = base::Bind( |
| &SyncDirectoryUpdateHandler::ApplyUpdatesImpl, |
| // We wait until the callback is executed. We can safely use Unretained. |
| base::Unretained(this), |
| base::Unretained(status)); |
| worker_->DoWorkAndWaitUntilDone(c); |
| } |
| |
| SyncerError SyncDirectoryUpdateHandler::ApplyUpdatesImpl( |
| sessions::StatusController* status) { |
| syncable::WriteTransaction trans(FROM_HERE, syncable::SYNCER, dir_); |
| |
| std::vector<int64> handles; |
| dir_->GetUnappliedUpdateMetaHandles( |
| &trans, |
| FullModelTypeSet(type_), |
| &handles); |
| |
| // First set of update application passes. |
| UpdateApplicator applicator(dir_->GetCryptographer(&trans)); |
| applicator.AttemptApplications(&trans, handles); |
| status->increment_num_updates_applied_by(applicator.updates_applied()); |
| status->increment_num_hierarchy_conflicts_by( |
| applicator.hierarchy_conflicts()); |
| status->increment_num_encryption_conflicts_by( |
| applicator.encryption_conflicts()); |
| |
| if (applicator.simple_conflict_ids().size() != 0) { |
| // Resolve the simple conflicts we just detected. |
| ConflictResolver resolver; |
| resolver.ResolveConflicts(&trans, |
| dir_->GetCryptographer(&trans), |
| applicator.simple_conflict_ids(), |
| status); |
| |
| // Conflict resolution sometimes results in more updates to apply. |
| handles.clear(); |
| dir_->GetUnappliedUpdateMetaHandles( |
| &trans, |
| FullModelTypeSet(type_), |
| &handles); |
| |
| UpdateApplicator conflict_applicator(dir_->GetCryptographer(&trans)); |
| conflict_applicator.AttemptApplications(&trans, handles); |
| |
| // We count the number of updates from both applicator passes. |
| status->increment_num_updates_applied_by( |
| conflict_applicator.updates_applied()); |
| |
| // Encryption conflicts should remain unchanged by the resolution of simple |
| // conflicts. Those can only be solved by updating our nigori key bag. |
| DCHECK_EQ(conflict_applicator.encryption_conflicts(), |
| applicator.encryption_conflicts()); |
| |
| // Hierarchy conflicts should also remain unchanged, for reasons that are |
| // more subtle. Hierarchy conflicts exist when the application of a pending |
| // update from the server would make the local folder hierarchy |
| // inconsistent. The resolution of simple conflicts could never affect the |
| // hierarchy conflicting item directly, because hierarchy conflicts are not |
| // processed by the conflict resolver. It could, in theory, modify the |
| // local hierarchy on which hierarchy conflict detection depends. However, |
| // the conflict resolution algorithm currently in use does not allow this. |
| DCHECK_EQ(conflict_applicator.hierarchy_conflicts(), |
| applicator.hierarchy_conflicts()); |
| |
| // There should be no simple conflicts remaining. We know this because the |
| // resolver should have resolved all the conflicts we detected last time |
| // and, by the two previous assertions, that no conflicts have been |
| // downgraded from encryption or hierarchy down to simple. |
| DCHECK(conflict_applicator.simple_conflict_ids().empty()); |
| } |
| |
| return SYNCER_OK; |
| } |
| |
| void SyncDirectoryUpdateHandler::UpdateSyncEntities( |
| syncable::ModelNeutralWriteTransaction* trans, |
| const SyncEntityList& applicable_updates, |
| sessions::StatusController* status) { |
| ProcessDownloadedUpdates(dir_, trans, type_, applicable_updates, status); |
| } |
| |
| void SyncDirectoryUpdateHandler::UpdateProgressMarker( |
| const sync_pb::DataTypeProgressMarker& progress_marker) { |
| int field_number = progress_marker.data_type_id(); |
| ModelType model_type = GetModelTypeFromSpecificsFieldNumber(field_number); |
| if (!IsRealDataType(model_type) || type_ != model_type) { |
| NOTREACHED() |
| << "Update handler of type " << ModelTypeToString(type_) |
| << " asked to process progress marker with invalid type " |
| << field_number; |
| } |
| dir_->SetDownloadProgress(type_, progress_marker); |
| } |
| |
| } // namespace syncer |