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

Issue 7461141: Rename BASE_API to BASE_EXPORT. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 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/base_export.h"
82 #include "base/gtest_prod_util.h" 82 #include "base/gtest_prod_util.h"
83 #include "base/memory/ref_counted.h" 83 #include "base/memory/ref_counted.h"
84 #include "base/observer_list.h" 84 #include "base/observer_list.h"
85 #include "base/synchronization/lock.h" 85 #include "base/synchronization/lock.h"
86 #include "base/time.h" 86 #include "base/time.h"
87 87
88 namespace base { 88 namespace base {
89 89
90 class FieldTrialList; 90 class FieldTrialList;
91 91
92 class BASE_API FieldTrial : public RefCounted<FieldTrial> { 92 class BASE_EXPORT FieldTrial : public RefCounted<FieldTrial> {
93 public: 93 public:
94 typedef int Probability; // Probability type for being selected in a trial. 94 typedef int Probability; // Probability type for being selected in a trial.
95 95
96 // A return value to indicate that a given instance has not yet had a group 96 // A return value to indicate that a given instance has not yet had a group
97 // assignment (and hence is not yet participating in the trial). 97 // assignment (and hence is not yet participating in the trial).
98 static const int kNotFinalized; 98 static const int kNotFinalized;
99 99
100 // This is the group number of the 'default' group. This provides an easy way 100 // This is the group number of the 'default' group. This provides an easy way
101 // to assign all the remaining probability to a group ('default'). 101 // to assign all the remaining probability to a group ('default').
102 static const int kDefaultGroupNumber; 102 static const int kDefaultGroupNumber;
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232 // group. 232 // group.
233 static bool enable_benchmarking_; 233 static bool enable_benchmarking_;
234 234
235 DISALLOW_COPY_AND_ASSIGN(FieldTrial); 235 DISALLOW_COPY_AND_ASSIGN(FieldTrial);
236 }; 236 };
237 237
238 //------------------------------------------------------------------------------ 238 //------------------------------------------------------------------------------
239 // Class with a list of all active field trials. A trial is active if it has 239 // Class with a list of all active field trials. A trial is active if it has
240 // been registered, which includes evaluating its state based on its probaility. 240 // been registered, which includes evaluating its state based on its probaility.
241 // Only one instance of this class exists. 241 // Only one instance of this class exists.
242 class BASE_API FieldTrialList { 242 class BASE_EXPORT FieldTrialList {
243 public: 243 public:
244 // Define a separator charactor to use when creating a persistent form of an 244 // Define a separator charactor to use when creating a persistent form of an
245 // instance. This is intended for use as a command line argument, passed to a 245 // instance. This is intended for use as a command line argument, passed to a
246 // second process to mimic our state (i.e., provide the same group name). 246 // second process to mimic our state (i.e., provide the same group name).
247 static const char kPersistentStringSeparator; // Currently a slash. 247 static const char kPersistentStringSeparator; // Currently a slash.
248 248
249 // Define expiration year in future. It is initialized to two years from Now. 249 // Define expiration year in future. It is initialized to two years from Now.
250 static int kExpirationYearInFuture; 250 static int kExpirationYearInFuture;
251 251
252 // Observer is notified when a FieldTrial's group is selected. 252 // Observer is notified when a FieldTrial's group is selected.
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385 385
386 // List of observers to be notified when a group is selected for a FieldTrial. 386 // List of observers to be notified when a group is selected for a FieldTrial.
387 ObserverList<Observer> observer_list_; 387 ObserverList<Observer> observer_list_;
388 388
389 DISALLOW_COPY_AND_ASSIGN(FieldTrialList); 389 DISALLOW_COPY_AND_ASSIGN(FieldTrialList);
390 }; 390 };
391 391
392 } // namespace base 392 } // namespace base
393 393
394 #endif // BASE_METRICS_FIELD_TRIAL_H_ 394 #endif // BASE_METRICS_FIELD_TRIAL_H_
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