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// Copyright 2020 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_SERVICE_ACTIVE_DEVICES_PROVIDER_H_
#define COMPONENTS_SYNC_SERVICE_ACTIVE_DEVICES_PROVIDER_H_
#include <string>
#include "base/functional/callback.h"
#include "components/sync/engine/active_devices_invalidation_info.h"
namespace syncer {
// An interface helping to get the information about active devices. Devices are
// considered active if there are DeviceInfo entries that are (typically) less
// than one day old (with a little margin around half an hour).
class ActiveDevicesProvider {
public:
using ActiveDevicesChangedCallback = base::RepeatingClosure;
virtual ~ActiveDevicesProvider() = default;
// Prepare information for the following sync cycles about invalidations on
// other devices.
virtual ActiveDevicesInvalidationInfo CalculateInvalidationInfo(
const std::string& local_cache_guid) const = 0;
// The `callback` will be called on each change in device infos. It might be
// called multiple times with the same number of active devices. The
// `callback` must be cleared before this object is destroyed.
virtual void SetActiveDevicesChangedCallback(
ActiveDevicesChangedCallback callback) = 0;
};
} // namespace syncer
#endif // COMPONENTS_SYNC_SERVICE_ACTIVE_DEVICES_PROVIDER_H_
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