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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 #include "base/metrics/field_trial.h" | 5 #include "base/metrics/field_trial.h" |
6 | 6 |
7 #include "base/build_time.h" | 7 #include "base/build_time.h" |
8 #include "base/logging.h" | 8 #include "base/logging.h" |
9 #include "base/rand_util.h" | 9 #include "base/rand_util.h" |
10 #include "base/sha1.h" | 10 #include "base/sha1.h" |
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163 big_string.append(1, kHistogramFieldTrialSeparator); | 163 big_string.append(1, kHistogramFieldTrialSeparator); |
164 return big_string.append(FieldTrialList::FindFullName(trial_name)); | 164 return big_string.append(FieldTrialList::FindFullName(trial_name)); |
165 } | 165 } |
166 | 166 |
167 // static | 167 // static |
168 void FieldTrial::EnableBenchmarking() { | 168 void FieldTrial::EnableBenchmarking() { |
169 DCHECK_EQ(0u, FieldTrialList::GetFieldTrialCount()); | 169 DCHECK_EQ(0u, FieldTrialList::GetFieldTrialCount()); |
170 enable_benchmarking_ = true; | 170 enable_benchmarking_ = true; |
171 } | 171 } |
172 | 172 |
173 void FieldTrial::SetForced() { | |
174 DCHECK(!forced_); | |
175 // Explicit forcing should only be for cases where we dynamically want to | |
176 // change the bucketting into groups, so there must have been at least one | |
jar (doing other things)
2012/05/05 00:32:26
I'm not clear what "change the buketting into grou
MAD
2012/05/07 13:48:09
Done.
| |
177 // non-default group appended. | |
178 DCHECK_GT(next_group_number_, kDefaultGroupNumber + 1); | |
179 | |
180 // And we must finalize the group choice before we mark ourselves as forced. | |
181 group(); | |
182 forced_ = true; | |
183 } | |
184 | |
173 FieldTrial::~FieldTrial() {} | 185 FieldTrial::~FieldTrial() {} |
174 | 186 |
175 void FieldTrial::SetGroupChoice(const std::string& name, int number) { | 187 void FieldTrial::SetGroupChoice(const std::string& name, int number) { |
176 group_ = number; | 188 group_ = number; |
177 if (name.empty()) | 189 if (name.empty()) |
178 StringAppendF(&group_name_, "%d", group_); | 190 StringAppendF(&group_name_, "%d", group_); |
179 else | 191 else |
180 group_name_ = name; | 192 group_name_ = name; |
181 } | 193 } |
182 | 194 |
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458 used_without_global_ = true; | 470 used_without_global_ = true; |
459 return; | 471 return; |
460 } | 472 } |
461 AutoLock auto_lock(global_->lock_); | 473 AutoLock auto_lock(global_->lock_); |
462 DCHECK(!global_->PreLockedFind(trial->name())); | 474 DCHECK(!global_->PreLockedFind(trial->name())); |
463 trial->AddRef(); | 475 trial->AddRef(); |
464 global_->registered_[trial->name()] = trial; | 476 global_->registered_[trial->name()] = trial; |
465 } | 477 } |
466 | 478 |
467 } // namespace base | 479 } // namespace base |
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