ios/chrome/browser/metrics/field_trial_synchronizer.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef IOS_CHROME_BROWSER_METRICS_FIELD_TRIAL_SYNCHRONIZER_H_
   6 #define IOS_CHROME_BROWSER_METRICS_FIELD_TRIAL_SYNCHRONIZER_H_
   7
   8 #include <string>
   9
  10 #include "base/macros.h"
  11 #include "base/metrics/field_trial.h"
  12
  13 namespace ios {
  14
  15 // FieldTrialSynchronizer registers itself as an observer of FieldTrialList
  16 // and update the list of experiment reported to in the crashes by setting
  17 // the corresponding crash key.
  18 class FieldTrialSynchronizer : public base::FieldTrialList::Observer {
  19  public:
  20   FieldTrialSynchronizer();
  21   ~FieldTrialSynchronizer() override;
  22
  23  private:
  24   // base::FieldTrialList::Observer implementation.
  25   void OnFieldTrialGroupFinalized(const std::string& field_trial_name,
  26                                   const std::string& group_name) override;
  27
  28   // Synchronizes the list of experiments into the crash keys. Called on
  29   // creation and when the list of field trial changes.
  30   void SynchronizeCrashKeyExperimentList();
  31
  32   DISALLOW_COPY_AND_ASSIGN(FieldTrialSynchronizer);
  33 };
  34
  35 }  // namespace ios
  36
  37 #endif  // IOS_CHROME_BROWSER_METRICS_FIELD_TRIAL_SYNCHRONIZER_H_