Feature to disable field trials in old versions of Chromium. Field trials...

base/metrics/field_trial.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // FieldTrial is a class for handling details of statistical experiments
 // performed by actual users in the field (i.e., in a shipped or beta product).
 // All code is called exclusively on the UI thread currently.
 //
 // The simplest example is an experiment to see whether one of two options
 // produces "better" results across our user population.  In that scenario, UMA
@@ skipping 48 matching lines @@
 
 //------------------------------------------------------------------------------
 
 #ifndef BASE_METRICS_FIELD_TRIAL_H_
 #define BASE_METRICS_FIELD_TRIAL_H_
 #pragma once
 
 #include <map>
 #include <string>
 
+#include "base/gtest_prod_util.h"
 #include "base/lock.h"
 #include "base/ref_counted.h"
 #include "base/time.h"
 
 namespace base {
 
 class FieldTrial : public RefCounted<FieldTrial> {
  public:
   typedef int Probability;  // Probability type for being selected in a trial.
 
   // A return value to indicate that a given instance has not yet had a group
-  // assignment (and hence is not yet participating in the trial).
-  static const int kNotParticipating;
+  // assignment (and hence group assignment is not yet finalized in the trial).
+  static const int kNotFinalized;
 
-  // Provide an easy way to assign all remaining probability to a group.  Note
-  // that this will force an instance to participate, and make it illegal to
-  // attempt to probabalistically add any other groups to the trial.  When doing
-  // A/B tests with timings, it is often best to define all groups, so that
-  // histograms will get unique names via the MakeName() methods.
-  static const Probability kAllRemainingProbability;
+  // Every field trial is reserved a kDefaultGroupNumber. If a group assigement
+  // is not done, when group() is called, all the remaining probability is
+  // assigned to a group and its number is kDefaultGroupNumber.
+  // When doing A/B tests with timings, it is often best to define all groups,
+  // so that histograms will get unique names via the MakeName() methods.
+  static const int kDefaultGroupNumber;
 
   // The name is used to register the instance with the FieldTrialList class,
   // and can be used to find the trial (only one trial can be present for each
   // name).
   // Group probabilities that are later supplied must sum to less than or equal
   // to the total_probability.
-  FieldTrial(const std::string& name, Probability total_probability);
+  FieldTrial(const std::string& name, Probability total_probability,
+             const std::string& default_group_name, const int year,
+             const int month, const int day_of_month);
 
   // Establish the name and probability of the next group in this trial.
   // Sometimes, based on construction randomization, this call may causes the
   // provided group to be *THE* group selected for use in this instance.
   int AppendGroup(const std::string& name, Probability group_probability);
 
   // Return the name of the FieldTrial (excluding the group name).
   std::string name() const { return name_; }
 
   // Return the randomly selected group number that was assigned.
-  // Return kNotParticipating if the instance is not participating in the
-  // experiment.
-  int group() const { return group_; }
+  // Return kDefaultGroupNumber if the instance is in the default group. This
+  // call finalizes the FieldTrial and group assignment is completed when this
+  // method is called.
+  int group();
 
   // If the field trial is not in an experiment, this returns the empty string.
   // if the group's name is empty, a name of "_" concatenated with the group
   // number is used as the group name.
   std::string group_name() const { return group_name_; }
 
   // Helper function for the most common use: as an argument to specifiy the
   // name of a HISTOGRAM.  Use the original histogram name as the name_prefix.
   static std::string MakeName(const std::string& name_prefix,
                               const std::string& trial_name);
 
   // Enable benchmarking sets field trials to a common setting.
   static void EnableBenchmarking();
 
  private:
+  // Allow tests to access our innards for testing purposes.
+  FRIEND_TEST(FieldTrialTest, Registration);
+  FRIEND_TEST(FieldTrialTest, AbsoluteProbabilities);
+  FRIEND_TEST(FieldTrialTest, RemainingProbability);
+  FRIEND_TEST(FieldTrialTest, FiftyFiftyProbability);
+  FRIEND_TEST(FieldTrialTest, MiddleProbabilities);
+  FRIEND_TEST(FieldTrialTest, OneWinner);
+  FRIEND_TEST(FieldTrialTest, DisableProbability);
+  FRIEND_TEST(FieldTrialTest, Save);
+  FRIEND_TEST(FieldTrialTest, DuplicateRestore);
+  FRIEND_TEST(FieldTrialTest, MakeName);
+
   friend class RefCounted<FieldTrial>;
 
+  // Create a Field Trial that runs forever (expires in 12/31/2099).
+  FieldTrial(const std::string& name, Probability total_probability,
+             const std::string& default_group_name);
+
+  // Determine if the field trial is to be disabled or not based on
+  // expiration time (year, month, day_of_month) and build time of the module.
+  // This method sets disable_field_trial_ to true, if the build time is after
+  // expiration_time_. If disable_field_trial_ is true then the field trial
+  // reverts to the 'default' bucket.
+  void Initialize(const int year, const int month, const int day_of_month);
+
   virtual ~FieldTrial();
 
+  // Get build time.
+  static Time GetBuildTime();
+
   // The name of the field trial, as can be found via the FieldTrialList.
   // This is empty of the trial is not in the experiment.
   const std::string name_;
 
   // The maximum sum of all probabilities supplied, which corresponds to 100%.
   // This is the scaling factor used to adjust supplied probabilities.
   Probability divisor_;
 
+  // The name of the default group.
+  const std::string default_group_name_;
+
   // The randomly selected probability that is used to select a group (or have
   // the instance not participate).  It is the product of divisor_ and a random
   // number between [0, 1).
   Probability random_;
 
   // Sum of the probabilities of all appended groups.
   Probability accumulated_group_probability_;
 
   int next_group_number_;
 
   // The pseudo-randomly assigned group number.
-  // This is kNotParticipating if no group has been assigned.
+  // This is kNotFinalized if no group has been assigned.
   int group_;
 
   // A textual name for the randomly selected group, including the Trial name.
   // If this Trial is not a member of an group, this string is empty.
   std::string group_name_;
 
+  // The default value (all remaining probabilities) can be selected after the
+  // expiration_time, which is based on the build time of the module.
+  base::Time expiration_time_;
+
+  // When disable_field_trial_ is true, field trial reverts to the 'default'
+  // bucket.
+  bool disable_field_trial_;
+
   // When benchmarking is enabled, field trials all revert to the 'default'
   // bucket.
   static bool enable_benchmarking_;
 
   DISALLOW_COPY_AND_ASSIGN(FieldTrial);
 };
 
 //------------------------------------------------------------------------------
 // Class with a list of all active field trials.  A trial is active if it has
 // been registered, which includes evaluating its state based on its probaility.
@@ skipping 75 matching lines @@
   Lock lock_;
   RegistrationList registered_;
 
   DISALLOW_COPY_AND_ASSIGN(FieldTrialList);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_FIELD_TRIAL_H_