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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.
#include "components/sync_driver/device_count_metrics_provider.h"
#include <algorithm>
#include "base/metrics/sparse_histogram.h"
#include "components/sync_driver/device_info_tracker.h"
namespace sync_driver {
DeviceCountMetricsProvider::DeviceCountMetricsProvider(
const ProvideTrackersCallback& provide_trackers)
: provide_trackers_(provide_trackers) {}
DeviceCountMetricsProvider::~DeviceCountMetricsProvider() {}
int DeviceCountMetricsProvider::MaxActiveDeviceCount() const {
std::vector<const sync_driver::DeviceInfoTracker*> trackers;
provide_trackers_.Run(&trackers);
int max = 0;
for (auto* tracker : trackers) {
max = std::max(max, tracker->CountActiveDevices());
}
return max;
}
void DeviceCountMetricsProvider::ProvideGeneralMetrics(
metrics::ChromeUserMetricsExtension* uma_proto) {
UMA_HISTOGRAM_SPARSE_SLOWLY("Sync.DeviceCount",
std::min(MaxActiveDeviceCount(), 100));
}
} // namespace sync_driver
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