69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
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//
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// Copyright (c) 2014 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 WEBRTC_SYSTEM_WRAPPERS_INCLUDE_FIELD_TRIAL_H_
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#define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_FIELD_TRIAL_H_
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#include <string>
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// Field trials allow webrtc clients (such as Chrome) 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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// WebRTC clients MUST provide an implementation of:
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//
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// std::string webrtc::field_trial::FindFullName(const std::string& trial).
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//
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// Or link with a default one provided in:
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//
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// system_wrappers/system_wrappers.gyp:field_trial_default
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//
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//
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// They are designed to wire up directly to chrome field trials and to speed up
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// developers by reducing the need to wire APIs to control whether a feature is
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// on/off. E.g. to experiment with a new method that could lead to a different
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// trade-off between CPU/bandwidth:
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//
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// 1 - Develop the feature with default behaviour off:
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//
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// if (FieldTrial::FindFullName("WebRTCExperimenMethod2") == "Enabled")
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// method2();
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// else
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// method1();
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//
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// 2 - Once the changes are rolled to chrome, the new code path can be
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// controlled as normal chrome field trials.
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//
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// 3 - Evaluate the new feature and clean the code paths.
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//
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// Notes:
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// - NOT every feature is a candidate to be controlled by this mechanism as
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// it may require negotation between involved parties (e.g. SDP).
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//
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// TODO(andresp): since chrome --force-fieldtrials does not marks the trial
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// as active it does not gets propaged to renderer process. For now one
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// needs to push a config with start_active:true or run a local finch
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// server.
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//
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// TODO(andresp): find out how to get bots to run tests with trials enabled.
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namespace webrtc {
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namespace field_trial {
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// Returns the group name chosen for the named trial, or the empty string
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// if the trial does not exists.
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//
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// Note: To keep things tidy append all the trial names with WebRTC.
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std::string FindFullName(const std::string& name);
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} // namespace field_trial
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} // namespace webrtc
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#endif // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_FIELD_TRIAL_H_
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