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