1 // Copyright 2013 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.
5 #include "chrome/browser/history/most_visited_tiles_experiment.h"
7 #include "base/metrics/field_trial.h"
8 #include "base/metrics/histogram.h"
9 #include "base/strings/string_util.h"
10 #include "chrome/common/instant_types.h"
16 // Constants for the most visited tile placement field trial.
18 // "OneEightGroup_Flipped" --> Will cause tile 1 and 8 to be flipped.
19 // "OneEightGroup_NoChange" --> Will not flip anything.
21 // See field trial config (MostVisitedTilePlacement.json) for details.
22 const char kMostVisitedFieldTrialName[] = "MostVisitedTilePlacement";
23 // Name of histogram tracking types of actions carried out by the field trial.
24 const char kMostVisitedExperimentHistogramName[] =
25 "NewTabPage.MostVisitedTilePlacementExperiment";
26 const char kOneEightGroupPrefix[] = "OneEight";
27 const char kOneFourGroupPrefix[] = "OneFour";
28 const char kFlippedSuffix[] = "Flipped";
29 const char kDontShowOpenURLsGroupName[] = "DontShowOpenTabs";
30 // Minimum number of Most Visited suggestions required in order for the Most
31 // Visited Field Trial to remove a URL already open in the browser.
32 const size_t kMinUrlSuggestions = 8;
37 void MostVisitedTilesExperiment::MaybeShuffle(MostVisitedURLList* data) {
38 const std::string group_name =
39 base::FieldTrialList::FindFullName(kMostVisitedFieldTrialName);
41 // Depending on the study group of the client, we might flip the 1st and 4th
42 // tiles, or the 1st and 8th, or do nothing.
43 if (!EndsWith(group_name, kFlippedSuffix, true))
46 size_t index_to_flip = 0;
47 if (StartsWithASCII(group_name, kOneEightGroupPrefix, true)) {
48 if (data->size() < 8) {
49 LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_8);
53 } else if (StartsWithASCII(group_name, kOneFourGroupPrefix, true)) {
54 if (data->size() < 4) {
55 LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_4);
60 std::swap((*data)[0], (*data)[index_to_flip]);
64 bool MostVisitedTilesExperiment::IsDontShowOpenURLsEnabled() {
65 return base::FieldTrialList::FindFullName(kMostVisitedFieldTrialName) ==
66 kDontShowOpenURLsGroupName;
70 void MostVisitedTilesExperiment::RemoveItemsMatchingOpenTabs(
71 const std::set<std::string>& open_urls,
72 std::vector<InstantMostVisitedItem>* items) {
73 for (size_t i = 0; i < items->size(); ) {
74 const std::string& url = (*items)[i].url.spec();
75 if (ShouldRemoveURL(open_urls, url, items->size()))
76 items->erase(items->begin() + i);
83 void MostVisitedTilesExperiment::RemovePageValuesMatchingOpenTabs(
84 const std::set<std::string>& open_urls,
85 base::ListValue* pages_value) {
86 for (size_t i = 0; i < pages_value->GetSize(); ) {
87 base::DictionaryValue* page_value;
89 if (pages_value->GetDictionary(i, &page_value) &&
90 page_value->GetString("url", &url) &&
91 ShouldRemoveURL(open_urls, url, pages_value->GetSize())) {
92 pages_value->Remove(*page_value, &i);
100 void MostVisitedTilesExperiment::LogInHistogram(
101 NtpTileExperimentActions action) {
102 UMA_HISTOGRAM_ENUMERATION(kMostVisitedExperimentHistogramName,
104 NUM_NTP_TILE_EXPERIMENT_ACTIONS);
108 bool MostVisitedTilesExperiment::ShouldRemoveURL(
109 const std::set<std::string>& open_urls,
110 const std::string& url,
112 if (open_urls.count(url) == 0)
115 if (size <= kMinUrlSuggestions) {
116 LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_DID_NOT_REMOVE_URL);
120 LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_REMOVED_URL);
124 } // namespace history