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// Copyright 2016 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_DEVICE_INFO_DEVICE_COUNT_METRICS_PROVIDER_H_
#define COMPONENTS_SYNC_DEVICE_INFO_DEVICE_COUNT_METRICS_PROVIDER_H_
#include <memory>
#include <vector>
#include "base/functional/callback.h"
#include "components/metrics/metrics_provider.h"
namespace syncer {
class DeviceInfoTracker;
// A registerable metrics provider that will emit the number of active syncing
// devices a user has upon UMA upload. When there are multiple active profiles
// that are aware of syncable devices, the largest count is used. This approach
// is useful for several reasons. We're significantly interested in "power"
// users that have multiple devices and profiles, and if we skipped emitting any
// metrics in multi profile cases, then we'd be unaware of this entire segment
// of the population. If we emitted multiple metrics, we would have much more
// noise and discerning which metrics actually belonged to non-syncing users
// would be much trickier.
class DeviceCountMetricsProvider : public metrics::MetricsProvider {
public:
using ProvideTrackersCallback = base::RepeatingCallback<void(
std::vector<const DeviceInfoTracker*>* trackers)>;
explicit DeviceCountMetricsProvider(
const ProvideTrackersCallback& provide_trackers);
DeviceCountMetricsProvider(const DeviceCountMetricsProvider&) = delete;
DeviceCountMetricsProvider& operator=(const DeviceCountMetricsProvider&) =
delete;
~DeviceCountMetricsProvider() override;
// MetricsProvider:
void ProvideCurrentSessionData(
metrics::ChromeUserMetricsExtension* uma_proto) override;
private:
// Returns the max number of active devices across all accounts.
int MaxActiveDeviceCount() const;
const ProvideTrackersCallback provide_trackers_;
};
} // namespace syncer
#endif // COMPONENTS_SYNC_DEVICE_INFO_DEVICE_COUNT_METRICS_PROVIDER_H_
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