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// Copyright 2017 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.
#ifndef COMPONENTS_METRICS_FIELD_TRIALS_PROVIDER_H_
#define COMPONENTS_METRICS_FIELD_TRIALS_PROVIDER_H_
#include <vector>
#include "base/strings/string_piece.h"
#include "base/time/time.h"
#include "components/metrics/metrics_provider.h"
// TODO(crbug/507665): Once MetricsProvider/SystemProfileProto are moved into
// //services/metrics, then //components/variations can depend on them, and
// this should be moved there.
namespace variations {
class SyntheticTrialRegistry;
struct ActiveGroupId;
class FieldTrialsProvider : public metrics::MetricsProvider {
public:
// |registry| must outlive this metrics provider.
FieldTrialsProvider(SyntheticTrialRegistry* registry,
base::StringPiece suffix);
~FieldTrialsProvider() override;
// metrics::MetricsProvider:
void OnDidCreateMetricsLog() override;
void ProvideSystemProfileMetrics(
metrics::SystemProfileProto* system_profile_proto) override;
private:
// Overrideable for testing.
virtual void GetFieldTrialIds(
std::vector<ActiveGroupId>* field_trial_ids) const;
SyntheticTrialRegistry* registry_;
// Suffix used for the field trial names before they are hashed for uploads.
std::string suffix_;
// A stack of log creation times.
// While the initial metrics log exists, there will be two logs open.
// Use a stack so that we use the right creation time for the first ongoing
// log.
// TODO(crbug/746098): Simplify InitialMetricsLog logic so this is not
// necessary.
std::vector<base::TimeTicks> creation_times_;
};
} // namespace variations
#endif // COMPONENTS_METRICS_FIELD_TRIALS_PROVIDER_H_
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