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// Copyright 2020 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_VARIATIONS_VARIATIONS_LAYERS_H_
#define COMPONENTS_VARIATIONS_VARIATIONS_LAYERS_H_
#include <map>
#include "base/component_export.h"
#include "base/metrics/field_trial.h"
#include "components/variations/proto/variations_seed.pb.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace variations {
// Parses out the Variations Layers data from the provided seed and
// chooses which member within each layer should be the active one.
class COMPONENT_EXPORT(VARIATIONS) VariationsLayers {
public:
VariationsLayers(
const VariationsSeed& seed,
const base::FieldTrial::EntropyProvider* low_entropy_provider);
VariationsLayers();
~VariationsLayers();
VariationsLayers(const VariationsLayers&) = delete;
VariationsLayers& operator=(const VariationsLayers&) = delete;
// Return whether the given layer has the given member active.
bool IsLayerMemberActive(uint32_t layer_id, uint32_t member_id) const;
// Return whether the layer should use the default entropy source
// (usually the high entropy source).
bool IsLayerUsingDefaultEntropy(uint32_t layer_id) const;
private:
void ConstructLayer(
const base::FieldTrial::EntropyProvider& low_entropy_provider,
const Layer& layer_proto);
struct LayerInfo {
LayerInfo(absl::optional<uint32_t> active_member_id,
Layer::EntropyMode entropy_mode);
~LayerInfo();
LayerInfo(const LayerInfo& other); // = delete;
LayerInfo& operator=(const LayerInfo&) = delete;
absl::optional<uint32_t> active_member_id;
Layer::EntropyMode entropy_mode;
};
std::map<uint32_t, LayerInfo> active_member_for_layer_;
};
} // namespace variations
#endif // COMPONENTS_VARIATIONS_VARIATIONS_LAYERS_H_
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