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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.
#ifndef COMPONENTS_VARIATIONS_VARIATIONS_PARAMS_MANAGER_H_
#define COMPONENTS_VARIATIONS_VARIATIONS_PARAMS_MANAGER_H_
#include <map>
#include <memory>
#include <set>
#include <string>
#include "base/macros.h"
#include "base/metrics/field_trial.h"
namespace base {
class FieldTrialList;
namespace test {
class ScopedFeatureList;
} // namespace test
} // namespace base
namespace variations {
namespace testing {
// Use this class as a member in your test class to set variation params for
// your tests. You can directly set the parameters in the constructor (if they
// are used by other members upon construction). You can change them later
// arbitrarily many times using the SetVariationParams function. Internally, it
// creates a FieldTrialList as a member. It works well for multiple tests of a
// given test class, as it clears the parameters when this class is destructed.
// Note that it clears all parameters (not just those registered here).
class VariationParamsManager {
public:
// Does not associate any parameters.
VariationParamsManager();
// Calls directly SetVariationParams with the provided arguments.
VariationParamsManager(
const std::string& trial_name,
const std::map<std::string, std::string>& param_values);
// Calls directly SetVariationParamsWithFeatures with the provided arguments.
VariationParamsManager(
const std::string& trial_name,
const std::map<std::string, std::string>& param_values,
const std::set<std::string>& associated_features);
~VariationParamsManager();
// Associates |param_values| with the given |trial_name|. |param_values| maps
// parameter names to their values. The function creates a new trial group,
// used only for testing. Between two calls of this function,
// ClearAllVariationParams() has to be called.
void SetVariationParams(
const std::string& trial_name,
const std::map<std::string, std::string>& param_values);
// Like SetVariationParams(). |associated_features| lists names of features
// to be associated to the newly created trial group. As a result, all
// parameters from |param_values| can be accessed via any of the feature from
// |associated_features|.
void SetVariationParamsWithFeatureAssociations(
const std::string& trial_name,
const std::map<std::string, std::string>& param_values,
const std::set<std::string>& associated_features);
// Clears all of the mapped associations.
void ClearAllVariationIDs();
// Clears all of the associated params.
void ClearAllVariationParams();
private:
std::unique_ptr<base::FieldTrialList> field_trial_list_;
std::unique_ptr<base::test::ScopedFeatureList> scoped_feature_list_;
DISALLOW_COPY_AND_ASSIGN(VariationParamsManager);
};
} // namespace testing
} // namespace variations
#endif // COMPONENTS_VARIATIONS_VARIATIONS_PARAMS_MANAGER_H_
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