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// Copyright 2017 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_VARIATIONS_SYNTHETIC_TRIALS_ACTIVE_GROUP_ID_PROVIDER_H_
#define COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_ACTIVE_GROUP_ID_PROVIDER_H_
#include <vector>
#include "base/component_export.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "components/variations/active_field_trials.h"
#include "components/variations/synthetic_trials.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
}
namespace variations {
// This is a helper class which can observe the creation of SyntheticTrialGroups
// and later provide a list of active group IDs to be included in the crash
// reports. This class is a thread-safe singleton.
class COMPONENT_EXPORT(VARIATIONS) SyntheticTrialsActiveGroupIdProvider
: public SyntheticTrialObserver {
public:
static SyntheticTrialsActiveGroupIdProvider* GetInstance();
SyntheticTrialsActiveGroupIdProvider(
const SyntheticTrialsActiveGroupIdProvider&) = delete;
SyntheticTrialsActiveGroupIdProvider& operator=(
const SyntheticTrialsActiveGroupIdProvider&) = delete;
// Returns currently active synthetic trial group IDs.
std::vector<ActiveGroupId> GetActiveGroupIds();
#if !defined(NDEBUG)
// In debug mode, not only the group IDs are tracked but also the full group
// info, to display the names unhashed in chrome://version.
std::vector<SyntheticTrialGroup> GetGroups();
#endif // !defined(NDEBUG)
// Clears state for testing.
void ResetForTesting();
private:
friend struct base::DefaultSingletonTraits<
SyntheticTrialsActiveGroupIdProvider>;
SyntheticTrialsActiveGroupIdProvider();
~SyntheticTrialsActiveGroupIdProvider() override;
// metrics::SyntheticTrialObserver:
void OnSyntheticTrialsChanged(
const std::vector<SyntheticTrialGroup>& trials_updated,
const std::vector<SyntheticTrialGroup>& trials_removed,
const std::vector<SyntheticTrialGroup>& groups) override;
base::Lock lock_;
std::vector<ActiveGroupId> group_ids_; // GUARDED_BY(lock_);
#if !defined(NDEBUG)
// In debug builds, keep the full group information to be able to display it
// in chrome://version.
std::vector<SyntheticTrialGroup> groups_; // GUARDED_BY(lock_);
#endif // !defined(NDEBUG)
};
} // namespace variations
#endif // COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_ACTIVE_GROUP_ID_PROVIDER_H_
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