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/*
* Copyright 2022 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef API_FIELD_TRIALS_REGISTRY_H_
#define API_FIELD_TRIALS_REGISTRY_H_
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
#include "api/field_trials_view.h"
#include "rtc_base/containers/flat_set.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
// Abstract base class for a field trial registry that verifies that any looked
// up key has been pre-registered in accordance with `g3doc/field-trials.md`.
class RTC_EXPORT FieldTrialsRegistry : public FieldTrialsView {
public:
FieldTrialsRegistry() = default;
FieldTrialsRegistry(const FieldTrialsRegistry&) = default;
FieldTrialsRegistry& operator=(const FieldTrialsRegistry&) = default;
~FieldTrialsRegistry() override = default;
// Verifies that `key` is a registered field trial and then returns the
// configured value for `key` or an empty string if the field trial isn't
// configured.
std::string Lookup(absl::string_view key) const override;
// Register additional `keys` for testing. This should only be used for
// imaginary keys that are never used outside test code.
void RegisterKeysForTesting(flat_set<std::string> keys) {
test_keys_ = std::move(keys);
}
private:
virtual std::string GetValue(absl::string_view key) const = 0;
// Imaginary keys only used for testing.
flat_set<std::string> test_keys_;
};
} // namespace webrtc
#endif // API_FIELD_TRIALS_REGISTRY_H_
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