1 /* 2 * Copyright 2019 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #ifndef API_FIELD_TRIALS_VIEW_H_ 11 #define API_FIELD_TRIALS_VIEW_H_ 12 13 #include <string> 14 15 #include "absl/strings/string_view.h" 16 #include "rtc_base/system/rtc_export.h" 17 18 namespace webrtc { 19 20 // An interface that provides the means to access field trials. 21 // 22 // Note that there are no guarantess that the meaning of a particular key-value 23 // mapping will be preserved over time and no announcements will be made if they 24 // are changed. It's up to the library user to ensure that the behavior does not 25 // break. 26 class RTC_EXPORT FieldTrialsView { 27 public: 28 virtual ~FieldTrialsView() = default; 29 30 // Returns the configured value for `key` or an empty string if the field 31 // trial isn't configured. 32 virtual std::string Lookup(absl::string_view key) const = 0; 33 IsEnabled(absl::string_view key)34 bool IsEnabled(absl::string_view key) const { 35 return Lookup(key).find("Enabled") == 0; 36 } 37 IsDisabled(absl::string_view key)38 bool IsDisabled(absl::string_view key) const { 39 return Lookup(key).find("Disabled") == 0; 40 } 41 }; 42 43 // TODO(bugs.webrtc.org/10335): Remove once all migrated to 44 // api/field_trials_view.h 45 typedef FieldTrialsView WebRtcKeyValueConfig; 46 47 } // namespace webrtc 48 49 #endif // API_FIELD_TRIALS_VIEW_H_ 50