| // Copyright 2016 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 COMPONENTS_SYNC_SESSIONS_LOST_NAVIGATIONS_RECORDER_H_ |
| #define COMPONENTS_SYNC_SESSIONS_LOST_NAVIGATIONS_RECORDER_H_ |
| |
| #include <map> |
| #include <set> |
| |
| #include "base/macros.h" |
| #include "components/sessions/core/session_id.h" |
| #include "components/sync/model/local_change_observer.h" |
| #include "components/sync/model/sync_change.h" |
| #include "components/sync/protocol/session_specifics.pb.h" |
| |
| namespace sync_sessions { |
| |
| // Recorder class that tracks the number of navigations written locally that |
| // aren't synced. This is done by recording set of locally observed navigations |
| // and reconciling these sets against what was ultimately synced. These |
| // navigations ultimately feed chrome history, so losing them prevents them from |
| // being reflected in the history page. |
| class LostNavigationsRecorder : public syncer::LocalChangeObserver { |
| public: |
| using id_type = SessionID::id_type; |
| using IdSet = std::set<id_type>; |
| enum RecorderState { RECORDER_STATE_NOT_SYNCING, RECORDER_STATE_SYNCING }; |
| |
| LostNavigationsRecorder(); |
| ~LostNavigationsRecorder() override; |
| |
| // syncer::LocalChangeObserver implementation. |
| void OnLocalChange(const syncer::syncable::Entry* current_entry, |
| const syncer::SyncChange& change) override; |
| |
| private: |
| void RecordChange(const syncer::SyncChange& change); |
| void DeleteTabs(const sync_pb::SessionHeader& header); |
| void TransitionState(bool is_syncing, bool is_unsynced); |
| void ReconcileLostNavs(); |
| |
| // State that records whether the most recently observed directory state was |
| // syncing or not syncing. |
| RecorderState recorder_state_; |
| |
| // The set of all navigation ids we've observed for each tab_id since the last |
| // sync. |
| std::map<id_type, IdSet> recorded_navigation_ids_; |
| // The set of navigation ids most recently recorded for each tab_id. |
| std::map<id_type, IdSet> latest_navigation_ids_; |
| // The maximum navigation_id recorded for each tab_id. |
| std::map<id_type, id_type> max_recorded_for_tab_; |
| DISALLOW_COPY_AND_ASSIGN(LostNavigationsRecorder); |
| }; |
| }; // namespace sync_sessions |
| |
| #endif // COMPONENTS_SYNC_SESSIONS_LOST_NAVIGATIONS_RECORDER_H_ |