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

Issue 6729002: Base: A few more files using BASE_API (for base.dll) (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Created 9 years, 9 months 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 // 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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71 71
72 //------------------------------------------------------------------------------ 72 //------------------------------------------------------------------------------
73 73
74 #ifndef BASE_METRICS_FIELD_TRIAL_H_ 74 #ifndef BASE_METRICS_FIELD_TRIAL_H_
75 #define BASE_METRICS_FIELD_TRIAL_H_ 75 #define BASE_METRICS_FIELD_TRIAL_H_
76 #pragma once 76 #pragma once
77 77
78 #include <map> 78 #include <map>
79 #include <string> 79 #include <string>
80 80
81 #include "base/base_api.h"
81 #include "base/gtest_prod_util.h" 82 #include "base/gtest_prod_util.h"
82 #include "base/ref_counted.h" 83 #include "base/ref_counted.h"
83 #include "base/synchronization/lock.h" 84 #include "base/synchronization/lock.h"
84 #include "base/time.h" 85 #include "base/time.h"
85 86
86 namespace base { 87 namespace base {
87 88
88 class FieldTrialList; 89 class FieldTrialList;
89 90
90 class FieldTrial : public RefCounted<FieldTrial> { 91 class BASE_API FieldTrial : public RefCounted<FieldTrial> {
91 public: 92 public:
92 typedef int Probability; // Probability type for being selected in a trial. 93 typedef int Probability; // Probability type for being selected in a trial.
93 94
94 // A return value to indicate that a given instance has not yet had a group 95 // A return value to indicate that a given instance has not yet had a group
95 // assignment (and hence is not yet participating in the trial). 96 // assignment (and hence is not yet participating in the trial).
96 static const int kNotFinalized; 97 static const int kNotFinalized;
97 98
98 // This is the group number of the 'default' group. This provides an easy way 99 // This is the group number of the 'default' group. This provides an easy way
99 // to assign all the remaining probability to a group ('default'). 100 // to assign all the remaining probability to a group ('default').
100 static const int kDefaultGroupNumber; 101 static const int kDefaultGroupNumber;
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203 // group. 204 // group.
204 static bool enable_benchmarking_; 205 static bool enable_benchmarking_;
205 206
206 DISALLOW_COPY_AND_ASSIGN(FieldTrial); 207 DISALLOW_COPY_AND_ASSIGN(FieldTrial);
207 }; 208 };
208 209
209 //------------------------------------------------------------------------------ 210 //------------------------------------------------------------------------------
210 // Class with a list of all active field trials. A trial is active if it has 211 // Class with a list of all active field trials. A trial is active if it has
211 // been registered, which includes evaluating its state based on its probaility. 212 // been registered, which includes evaluating its state based on its probaility.
212 // Only one instance of this class exists. 213 // Only one instance of this class exists.
213 class FieldTrialList { 214 class BASE_API FieldTrialList {
214 public: 215 public:
215 // Define a separator charactor to use when creating a persistent form of an 216 // Define a separator charactor to use when creating a persistent form of an
216 // instance. This is intended for use as a command line argument, passed to a 217 // instance. This is intended for use as a command line argument, passed to a
217 // second process to mimic our state (i.e., provide the same group name). 218 // second process to mimic our state (i.e., provide the same group name).
218 static const char kPersistentStringSeparator; // Currently a slash. 219 static const char kPersistentStringSeparator; // Currently a slash.
219 220
220 // This singleton holds the global list of registered FieldTrials. 221 // This singleton holds the global list of registered FieldTrials.
221 FieldTrialList(); 222 FieldTrialList();
222 // Destructor Release()'s references to all registered FieldTrial instances. 223 // Destructor Release()'s references to all registered FieldTrial instances.
223 ~FieldTrialList(); 224 ~FieldTrialList();
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287 base::Lock lock_; 288 base::Lock lock_;
288 RegistrationList registered_; 289 RegistrationList registered_;
289 290
290 DISALLOW_COPY_AND_ASSIGN(FieldTrialList); 291 DISALLOW_COPY_AND_ASSIGN(FieldTrialList);
291 }; 292 };
292 293
293 } // namespace base 294 } // namespace base
294 295
295 #endif // BASE_METRICS_FIELD_TRIAL_H_ 296 #endif // BASE_METRICS_FIELD_TRIAL_H_
296 297
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