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// Copyright 2014 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 <memory>
#include <string>
#include <vector>
#include "components/sync_device_info/device_info.h"
namespace syncer {
// Interface for tracking synced DeviceInfo.
class DeviceInfoTracker {
virtual ~DeviceInfoTracker() {}
// Observer class for listening to device info changes.
class Observer {
virtual void OnDeviceInfoChange() = 0;
// Returns true when DeviceInfo datatype is enabled and syncing.
virtual bool IsSyncing() const = 0;
// Gets DeviceInfo the synced device with specified client ID.
// Returns an empty unique_ptr if device with the given |client_id| hasn't
// been synced.
virtual std::unique_ptr<DeviceInfo> GetDeviceInfo(
const std::string& client_id) const = 0;
// Gets DeviceInfo for all synced devices (including the local one).
virtual std::vector<std::unique_ptr<DeviceInfo>> GetAllDeviceInfo() const = 0;
// Registers an observer to be called on syncing any updated DeviceInfo.
virtual void AddObserver(Observer* observer) = 0;
// Unregisters an observer.
virtual void RemoveObserver(Observer* observer) = 0;
// Returns the count of active devices. Deduping logic may be used internally
// to prevent double counting for devices that disable sync and reenable it,
// but callers should nevertheless consider this an upper bound.
virtual int CountActiveDevices() const = 0;
// A temporary function to to allow tests to ensure active devices.
// TODO(crbug/948784) remove this function after architecture work.
virtual void ForcePulseForTest() = 0;
// Returns if the provided |cache_guid| is the current device cache_guid for
// the current device or was of the recently used.
virtual bool IsRecentLocalCacheGuid(const std::string& cache_guid) const = 0;
} // namespace syncer