sync: Merge apply updates and resolve conflicts

sync/engine/apply_updates_command.cc

-// Copyright (c) 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.
-
-#include "sync/engine/apply_updates_command.h"
-
-#include "base/location.h"
-#include "sync/engine/update_applicator.h"
-#include "sync/sessions/sync_session.h"
-#include "sync/syncable/directory.h"
-#include "sync/syncable/read_transaction.h"
-#include "sync/syncable/write_transaction.h"
-
-namespace syncer {
-
-using sessions::SyncSession;
-
-ApplyUpdatesCommand::ApplyUpdatesCommand() {}
-ApplyUpdatesCommand::~ApplyUpdatesCommand() {}
-
-std::set<ModelSafeGroup> ApplyUpdatesCommand::GetGroupsToChange(
-    const sessions::SyncSession& session) const {
-  std::set<ModelSafeGroup> groups_with_unapplied_updates;
-
-  FullModelTypeSet server_types_with_unapplied_updates;
-  {
-    syncable::Directory* dir = session.context()->directory();
-    syncable::ReadTransaction trans(FROM_HERE, dir);
-    server_types_with_unapplied_updates =
-        dir->GetServerTypesWithUnappliedUpdates(&trans);
-  }
-
-  for (FullModelTypeSet::Iterator it =
-           server_types_with_unapplied_updates.First(); it.Good(); it.Inc()) {
-    groups_with_unapplied_updates.insert(
-        GetGroupForModelType(it.Get(), session.routing_info()));
-  }
-
-  return groups_with_unapplied_updates;
-}
-
-SyncerError ApplyUpdatesCommand::ModelChangingExecuteImpl(
-    SyncSession* session) {
-  syncable::Directory* dir = session->context()->directory();
-  syncable::WriteTransaction trans(FROM_HERE, syncable::SYNCER, dir);
-
-  // Compute server types with unapplied updates that fall under our
-  // group restriction.
-  const FullModelTypeSet server_types_with_unapplied_updates =
-      dir->GetServerTypesWithUnappliedUpdates(&trans);
-  FullModelTypeSet server_type_restriction;
-  for (FullModelTypeSet::Iterator it =
-           server_types_with_unapplied_updates.First(); it.Good(); it.Inc()) {
-    if (GetGroupForModelType(it.Get(), session->routing_info()) ==
-        session->status_controller().group_restriction()) {
-      server_type_restriction.Put(it.Get());
-    }
-  }
-
-  // Don't process control type updates here.  They will be handled elsewhere.
-  FullModelTypeSet control_types = ToFullModelTypeSet(ControlTypes());
-  server_type_restriction.RemoveAll(control_types);
-
-  std::vector<int64> handles;
-  dir->GetUnappliedUpdateMetaHandles(
-      &trans, server_type_restriction, &handles);
-
-  UpdateApplicator applicator(
-      dir->GetCryptographer(&trans),
-      session->routing_info(),
-      session->status_controller().group_restriction());
-  applicator.AttemptApplications(&trans, handles,
-                                 session->mutable_status_controller());
-
-  // This might be the first time we've fully completed a sync cycle, for
-  // some subset of the currently synced datatypes.
-  const sessions::StatusController& status(session->status_controller());
-  if (status.ServerSaysNothingMoreToDownload()) {
-    for (ModelTypeSet::Iterator it =
-             status.updates_request_types().First(); it.Good(); it.Inc()) {
-      // Don't set the flag for control types.  We didn't process them here.
-      if (IsControlType(it.Get()))
-        continue;
-
-      // This gets persisted to the directory's backing store.
-      dir->set_initial_sync_ended_for_type(it.Get(), true);
-    }
-  }
-
-  return SYNCER_OK;
-}
-
-}  // namespace syncer