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Side by Side Diff: base/metrics/field_trial.cc

Issue 8510027: base: export GetBuildTime (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: ... Created 9 years, 1 month ago
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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2011 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/logging.h" 8 #include "base/logging.h"
8 #include "base/rand_util.h" 9 #include "base/rand_util.h"
9 #include "base/sha1.h" 10 #include "base/sha1.h"
11 #include "base/stringprintf.h"
10 #include "base/string_util.h" 12 #include "base/string_util.h"
11 #include "base/stringprintf.h"
12 #include "base/utf_string_conversions.h" 13 #include "base/utf_string_conversions.h"
13 14
14 namespace base { 15 namespace base {
15 16
16 // static 17 // static
17 const int FieldTrial::kNotFinalized = -1; 18 const int FieldTrial::kNotFinalized = -1;
18 19
19 // static 20 // static
20 const int FieldTrial::kDefaultGroupNumber = 0; 21 const int FieldTrial::kDefaultGroupNumber = 0;
21 22
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147 148
148 // static 149 // static
149 void FieldTrial::EnableBenchmarking() { 150 void FieldTrial::EnableBenchmarking() {
150 DCHECK_EQ(0u, FieldTrialList::GetFieldTrialCount()); 151 DCHECK_EQ(0u, FieldTrialList::GetFieldTrialCount());
151 enable_benchmarking_ = true; 152 enable_benchmarking_ = true;
152 } 153 }
153 154
154 FieldTrial::~FieldTrial() {} 155 FieldTrial::~FieldTrial() {}
155 156
156 // static 157 // static
157 Time FieldTrial::GetBuildTime() {
158 Time integral_build_time;
159 const char* kDateTime = __DATE__ " " __TIME__;
160 bool result = Time::FromString(kDateTime, &integral_build_time);
161 DCHECK(result);
162 return integral_build_time;
163 }
164
165 // static
166 double FieldTrial::HashClientId(const std::string& client_id, 158 double FieldTrial::HashClientId(const std::string& client_id,
167 const std::string& trial_name) { 159 const std::string& trial_name) {
168 // SHA-1 is designed to produce a uniformly random spread in its output space, 160 // SHA-1 is designed to produce a uniformly random spread in its output space,
169 // even for nearly-identical inputs, so it helps massage whatever client_id 161 // even for nearly-identical inputs, so it helps massage whatever client_id
170 // and trial_name we get into something with a uniform distribution, which 162 // and trial_name we get into something with a uniform distribution, which
171 // is desirable so that we don't skew any part of the 0-100% spectrum. 163 // is desirable so that we don't skew any part of the 0-100% spectrum.
172 std::string input(client_id + trial_name); 164 std::string input(client_id + trial_name);
173 unsigned char sha1_hash[kSHA1Length]; 165 unsigned char sha1_hash[kSHA1Length];
174 SHA1HashBytes(reinterpret_cast<const unsigned char*>(input.c_str()), 166 SHA1HashBytes(reinterpret_cast<const unsigned char*>(input.c_str()),
175 input.size(), 167 input.size(),
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386 } 378 }
387 379
388 FieldTrial* FieldTrialList::PreLockedFind(const std::string& name) { 380 FieldTrial* FieldTrialList::PreLockedFind(const std::string& name) {
389 RegistrationList::iterator it = registered_.find(name); 381 RegistrationList::iterator it = registered_.find(name);
390 if (registered_.end() == it) 382 if (registered_.end() == it)
391 return NULL; 383 return NULL;
392 return it->second; 384 return it->second;
393 } 385 }
394 386
395 } // namespace base 387 } // namespace base
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