1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
// 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.
#ifndef CHROME_BROWSER_INSTANT_INSTANT_FIELD_TRIAL_H_
#define CHROME_BROWSER_INSTANT_INSTANT_FIELD_TRIAL_H_
#include <string>
#include "base/basictypes.h"
class Profile;
// This class manages the Instant field trial. Each user is in exactly one of
// three field trial groups: Inactive, Control or Experiment.
// - Inactive users are those who have played with the Instant option in the
// Preferences page, or those for whom group policy provides an override, or
// those with an incognito profile, etc. The field trial is inactive for such
// users, so their Instant preference setting is respected.
// - Control and Experiment are all the other users, i.e., those who have never
// touched the Preferences option. Some percentage of these users are chosen
// into the Experiment group and get Instant enabled automatically. The rest
// fall into the Control group; for them, Instant remains disabled by default.
// - Control and Experiment are further split into two subgroups each, in order
// to detect bias between them (when analyzing metrics). The subgroups are
// treated identically for all other purposes.
class InstantFieldTrial {
public:
enum Group {
INACTIVE,
CONTROL1,
CONTROL2,
EXPERIMENT1,
EXPERIMENT2,
};
static Group GetGroup(Profile* profile);
// Check if the group is either of the two experiment subgroups.
static bool IsExperimentGroup(Profile* profile);
// Returns a string describing the user's group. Can be added to histogram
// names, to split histograms by field trial groups.
static std::string GetGroupName(Profile* profile);
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(InstantFieldTrial);
};
#endif // CHROME_BROWSER_INSTANT_INSTANT_FIELD_TRIAL_H_
|
