sync: Implement per-type update processing

sync/engine/process_updates_command.h

-// Copyright 2012 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.
-
-#ifndef SYNC_ENGINE_PROCESS_UPDATES_COMMAND_H_
-#define SYNC_ENGINE_PROCESS_UPDATES_COMMAND_H_
-
-#include "base/compiler_specific.h"
-#include "sync/base/sync_export.h"
-#include "sync/engine/model_changing_syncer_command.h"
-#include "sync/engine/syncer_types.h"
-
-namespace sync_pb {
-class GetUpdatesResponse;
-class SyncEntity;
-}
-
-namespace syncer {
-
-namespace syncable {
-class ModelNeutralWriteTransaction;
-}
-
-class Cryptographer;
-
-// A syncer command for verifying and processing updates.
-//
-// Preconditions - Updates in the SyncerSesssion have been downloaded.
-//
-// Postconditions - All of the verified SyncEntity data will be copied to
-//                  the server fields of the corresponding syncable entries.
-class SYNC_EXPORT_PRIVATE ProcessUpdatesCommand : public SyncerCommand {
- public:
-  ProcessUpdatesCommand();
-  virtual ~ProcessUpdatesCommand();
-
- protected:
-  // SyncerCommand implementation.
-  virtual SyncerError ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
-
- private:
-  typedef std::vector<const sync_pb::SyncEntity*> SyncEntityList;
-  typedef std::map<ModelType, SyncEntityList> TypeSyncEntityMap;
-
-  // Given a GetUpdates response, iterates over all the returned items and
-  // divides them according to their type.  Outputs a map from model types to
-  // received SyncEntities.  ModelTypes that had no items in the update response
-  // will not be included in this map.
-  static void PartitionUpdatesByType(
-      const sync_pb::GetUpdatesResponse& updates,
-      TypeSyncEntityMap* updates_by_type);
-
-  VerifyResult VerifyUpdate(
-      syncable::ModelNeutralWriteTransaction* trans,
-      const sync_pb::SyncEntity& entry,
-      ModelTypeSet requested_types,
-      const ModelSafeRoutingInfo& routes);
-  void ProcessUpdate(
-      const sync_pb::SyncEntity& proto_update,
-      const Cryptographer* cryptographer,
-      syncable::ModelNeutralWriteTransaction* const trans);
-  DISALLOW_COPY_AND_ASSIGN(ProcessUpdatesCommand);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_ENGINE_PROCESS_UPDATES_COMMAND_H_