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// 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.
#include "chrome/browser/instant/instant_field_trial.h"
#include "base/metrics/field_trial.h"
#include "chrome/browser/metrics/metrics_service.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/pref_names.h"
namespace {
// Field trial IDs of the control and experiment groups. Though they are not
// literally "const", they are set only once, in Activate() below.
int g_control_group_id_1 = 0;
int g_control_group_id_2 = 0;
int g_experiment_group_id_1 = 0;
int g_experiment_group_id_2 = 0;
}
// static
void InstantFieldTrial::Activate() {
scoped_refptr<base::FieldTrial> trial(
new base::FieldTrial("Instant", 1000, "InstantInactive", 2012, 1, 1));
// One-time randomization is disabled if the user hasn't opted-in to UMA.
if (!base::FieldTrialList::IsOneTimeRandomizationEnabled())
return;
trial->UseOneTimeRandomization();
g_control_group_id_1 = trial->AppendGroup("InstantControl1", 450); // 45%
g_control_group_id_2 = trial->AppendGroup("InstantControl2", 450); // 45%
g_experiment_group_id_1 = trial->AppendGroup("InstantExperiment1", 50); // 5%
g_experiment_group_id_2 = trial->AppendGroup("InstantExperiment2", 50); // 5%
}
// static
InstantFieldTrial::Group InstantFieldTrial::GetGroup(Profile* profile) {
if (!profile || profile->IsOffTheRecord())
return INACTIVE;
const PrefService* prefs = profile->GetPrefs();
if (!prefs ||
!MetricsServiceHelper::IsMetricsReportingEnabled() ||
!prefs->GetBoolean(prefs::kSearchSuggestEnabled) ||
prefs->GetBoolean(prefs::kInstantEnabledOnce) ||
prefs->IsManagedPreference(prefs::kInstantEnabled)) {
return INACTIVE;
}
const int group = base::FieldTrialList::FindValue("Instant");
if (group == base::FieldTrial::kNotFinalized ||
group == base::FieldTrial::kDefaultGroupNumber) {
return INACTIVE;
}
return group == g_control_group_id_1 ? CONTROL1 :
group == g_control_group_id_2 ? CONTROL2 :
group == g_experiment_group_id_1 ? EXPERIMENT1 :
group == g_experiment_group_id_2 ? EXPERIMENT2
: INACTIVE;
}
// static
bool InstantFieldTrial::IsExperimentGroup(Profile* profile) {
Group group = GetGroup(profile);
return group == EXPERIMENT1 || group == EXPERIMENT2;
}
// static
std::string InstantFieldTrial::GetGroupName(Profile* profile) {
switch (GetGroup(profile)) {
case INACTIVE: return "InstantInactive";
case CONTROL1: return "InstantControl1";
case CONTROL2: return "InstantControl2";
case EXPERIMENT1: return "InstantExperiment1";
case EXPERIMENT2: return "InstantExperiment2";
}
NOTREACHED();
return "InstantUnknown";
}
// static
std::string InstantFieldTrial::GetGroupAsUrlParam(Profile* profile) {
switch (GetGroup(profile)) {
case INACTIVE: return std::string();
case CONTROL1: return "ix=c1&";
case CONTROL2: return "ix=c2&";
case EXPERIMENT1: return "ix=e1&";
case EXPERIMENT2: return "ix=e2&";
}
NOTREACHED();
return std::string();
}
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