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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SYNC_USER_EVENTS_GLOBAL_ID_MAPPER_H_
#define COMPONENTS_SYNC_USER_EVENTS_GLOBAL_ID_MAPPER_H_
#include <stdint.h>
#include "base/functional/callback.h"
namespace syncer {
using GlobalIdChange =
base::RepeatingCallback<void(int64_t old_global_id, int64_t new_global_id)>;
// UserEventSpecifics references SESSIONS data through their |navigation_id|
// which will match values seen in TabNavigation's |global_id|. This field is
// really just the timestamp from the NavigationEntry, which can change when a
// page is reloaded. This will cause the SESSIONS side to override the old data.
// The impact to USER_EVENTS depends on if the previous timestamp made it to the
// server as part of SESSIONS data or not. If it did not, then USER_EVENTS must
// be updated. But knowing the answer that question is currently very tricky
// with Sync's current architecture, so instead we always update for uncommitted
// USER_EVENTS. The purpose of the GlobalIdMapper is the track changes in the
// SESSIONS' |global_id| field and feed this information the USER_EVENTS side.
class GlobalIdMapper {
public:
// Register for information about changing
virtual void AddGlobalIdChangeObserver(GlobalIdChange callback) = 0;
// Given a |global_id|, returns what the latest global_id is for the given
// navigation, to the best of our ability. If we do not have such a mapping,
// which is quite possible, the input |global_id| is returned.
virtual int64_t GetLatestGlobalId(int64_t global_id) = 0;
};
} // namespace syncer
#endif // COMPONENTS_SYNC_USER_EVENTS_GLOBAL_ID_MAPPER_H_
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