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// 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:
typedef SessionID::id_type id_type;
typedef std::set<id_type> IdSet;
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_
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