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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // FieldTrial is a class for handling details of statistical experiments | 5 // FieldTrial is a class for handling details of statistical experiments |
6 // performed by actual users in the field (i.e., in a shipped or beta product). | 6 // performed by actual users in the field (i.e., in a shipped or beta product). |
7 // All code is called exclusively on the UI thread currently. | 7 // All code is called exclusively on the UI thread currently. |
8 // | 8 // |
9 // The simplest example is an experiment to see whether one of two options | 9 // The simplest example is an experiment to see whether one of two options |
10 // produces "better" results across our user population. In that scenario, UMA | 10 // produces "better" results across our user population. In that scenario, UMA |
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57 #include <stddef.h> | 57 #include <stddef.h> |
58 #include <stdint.h> | 58 #include <stdint.h> |
59 | 59 |
60 #include <map> | 60 #include <map> |
61 #include <memory> | 61 #include <memory> |
62 #include <set> | 62 #include <set> |
63 #include <string> | 63 #include <string> |
64 #include <vector> | 64 #include <vector> |
65 | 65 |
66 #include "base/base_export.h" | 66 #include "base/base_export.h" |
| 67 #include "base/command_line.h" |
67 #include "base/gtest_prod_util.h" | 68 #include "base/gtest_prod_util.h" |
68 #include "base/macros.h" | 69 #include "base/macros.h" |
69 #include "base/memory/ref_counted.h" | 70 #include "base/memory/ref_counted.h" |
| 71 #include "base/memory/shared_memory.h" |
70 #include "base/observer_list_threadsafe.h" | 72 #include "base/observer_list_threadsafe.h" |
71 #include "base/strings/string_piece.h" | 73 #include "base/strings/string_piece.h" |
72 #include "base/synchronization/lock.h" | 74 #include "base/synchronization/lock.h" |
73 #include "base/time/time.h" | 75 #include "base/time/time.h" |
74 | 76 |
75 namespace base { | 77 namespace base { |
76 | 78 |
77 class FieldTrialList; | 79 class FieldTrialList; |
78 | 80 |
79 class BASE_EXPORT FieldTrial : public RefCounted<FieldTrial> { | 81 class BASE_EXPORT FieldTrial : public RefCounted<FieldTrial> { |
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457 // used in a non-browser process, to carry randomly selected state in a | 459 // used in a non-browser process, to carry randomly selected state in a |
458 // browser process into this non-browser process, but could also be invoked | 460 // browser process into this non-browser process, but could also be invoked |
459 // through a command line argument to the browser process. Created field | 461 // through a command line argument to the browser process. Created field |
460 // trials will be marked "used" for the purposes of active trial reporting | 462 // trials will be marked "used" for the purposes of active trial reporting |
461 // if they are prefixed with |kActivationMarker|. Trial names in | 463 // if they are prefixed with |kActivationMarker|. Trial names in |
462 // |ignored_trial_names| are ignored when parsing |trials_string|. | 464 // |ignored_trial_names| are ignored when parsing |trials_string|. |
463 static bool CreateTrialsFromString( | 465 static bool CreateTrialsFromString( |
464 const std::string& trials_string, | 466 const std::string& trials_string, |
465 const std::set<std::string>& ignored_trial_names); | 467 const std::set<std::string>& ignored_trial_names); |
466 | 468 |
| 469 // Achieves the same thing as CreateTrialsFromString, except wraps the logic |
| 470 // by taking in the trials from the command line, either via shared memory |
| 471 // handle or command line argument. |
| 472 // If using shared memory to pass around the list of field trials, then |
| 473 // expects |field_trial_handle_switch| command line argument to |
| 474 // contain the shared memory handle. |
| 475 // If not, then create the trials as before (using the kForceFieldTrials |
| 476 // switch). Needs the |field_trial_handle_switch| argument to be passed in |
| 477 // since base/ can't depend on content/. |
| 478 static void CreateTrialsFromCommandLine( |
| 479 const base::CommandLine& cmd_line, |
| 480 const char* field_trial_handle_switch); |
| 481 |
| 482 // Adds a switch to the command line containing the field trial state as a |
| 483 // string (if not using shared memory to share field trial state), or the |
| 484 // shared memory handle + length. |
| 485 // Needs the |field_trial_handle_switch| argument to be passed in since base/ |
| 486 // can't depend on content/. |
| 487 static std::unique_ptr<base::SharedMemory> CopyFieldTrialStateToFlags( |
| 488 const char* field_trial_handle_switch, |
| 489 base::CommandLine* cmd_line); |
| 490 |
467 // Create a FieldTrial with the given |name| and using 100% probability for | 491 // Create a FieldTrial with the given |name| and using 100% probability for |
468 // the FieldTrial, force FieldTrial to have the same group string as | 492 // the FieldTrial, force FieldTrial to have the same group string as |
469 // |group_name|. This is commonly used in a non-browser process, to carry | 493 // |group_name|. This is commonly used in a non-browser process, to carry |
470 // randomly selected state in a browser process into this non-browser process. | 494 // randomly selected state in a browser process into this non-browser process. |
471 // It returns NULL if there is a FieldTrial that is already registered with | 495 // It returns NULL if there is a FieldTrial that is already registered with |
472 // the same |name| but has different finalized group string (|group_name|). | 496 // the same |name| but has different finalized group string (|group_name|). |
473 static FieldTrial* CreateFieldTrial(const std::string& name, | 497 static FieldTrial* CreateFieldTrial(const std::string& name, |
474 const std::string& group_name); | 498 const std::string& group_name); |
475 | 499 |
476 // Add an observer to be notified when a field trial is irrevocably committed | 500 // Add an observer to be notified when a field trial is irrevocably committed |
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524 | 548 |
525 // List of observers to be notified when a group is selected for a FieldTrial. | 549 // List of observers to be notified when a group is selected for a FieldTrial. |
526 scoped_refptr<ObserverListThreadSafe<Observer> > observer_list_; | 550 scoped_refptr<ObserverListThreadSafe<Observer> > observer_list_; |
527 | 551 |
528 DISALLOW_COPY_AND_ASSIGN(FieldTrialList); | 552 DISALLOW_COPY_AND_ASSIGN(FieldTrialList); |
529 }; | 553 }; |
530 | 554 |
531 } // namespace base | 555 } // namespace base |
532 | 556 |
533 #endif // BASE_METRICS_FIELD_TRIAL_H_ | 557 #endif // BASE_METRICS_FIELD_TRIAL_H_ |
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