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f096e74157
This cl/ creates a constructor for a FieldTrials object that is not backed by the global string. Use with care! Bug: webrtc:10335 Change-Id: I8c48d1e8bb52fef78524d890cc90473355be617f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264461 Commit-Queue: Jonas Oreland <jonaso@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37057}
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
/*
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* Copyright (c) 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_H_
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#define API_FIELD_TRIALS_H_
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#include <memory>
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#include <string>
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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_map.h"
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namespace webrtc {
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// The FieldTrials class is used to inject field trials into webrtc.
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//
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// Field trials allow webrtc clients (such as Chromium) to turn on feature code
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// in binaries out in the field and gather information with that.
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//
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// They are designed to be easy to use with Chromium field trials and to speed
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// up developers by reducing the need to wire up APIs to control whether a
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// feature is on/off.
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//
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// The field trials are injected into objects that use them at creation time.
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//
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// NOTE: Creating multiple FieldTrials-object is currently prohibited
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// until we remove the global string (TODO(bugs.webrtc.org/10335))
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// (unless using CreateNoGlobal):
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class FieldTrials : public FieldTrialsView {
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public:
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explicit FieldTrials(const std::string& s);
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~FieldTrials();
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// Create a FieldTrials object that is not reading/writing from
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// global variable (i.e can not be used for all parts of webrtc).
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static std::unique_ptr<FieldTrials> CreateNoGlobal(const std::string& s);
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std::string Lookup(absl::string_view key) const override;
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private:
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explicit FieldTrials(const std::string& s, bool);
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const bool uses_global_;
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const std::string field_trial_string_;
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const char* const previous_field_trial_string_;
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const flat_map<std::string, std::string> key_value_map_;
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};
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} // namespace webrtc
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#endif // API_FIELD_TRIALS_H_
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