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| 1 // Copyright (c) 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. |
| 4 |
| 5 #include "chrome/browser/history/most_visited_tiles_experiment.h" |
| 6 |
| 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" |
| 11 |
| 12 namespace history { |
| 13 |
| 14 namespace { |
| 15 |
| 16 // Constants for the most visited tile placement field trial. |
| 17 // ex: |
| 18 // "OneEightGroup_Flipped" --> Will cause tile 1 and 8 to be flipped. |
| 19 // "OneEightGroup_NoChange" --> Will not flip anything. |
| 20 // |
| 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; |
| 33 |
| 34 } // namespace |
| 35 |
| 36 // static |
| 37 void MostVisitedTilesExperiment::MaybeShuffle(MostVisitedURLList* data) { |
| 38 const std::string group_name = |
| 39 base::FieldTrialList::FindFullName(kMostVisitedFieldTrialName); |
| 40 |
| 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)) |
| 44 return; |
| 45 |
| 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); |
| 50 return; |
| 51 } |
| 52 index_to_flip = 7; |
| 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); |
| 56 return; |
| 57 } |
| 58 index_to_flip = 3; |
| 59 } |
| 60 std::swap((*data)[0], (*data)[index_to_flip]); |
| 61 } |
| 62 |
| 63 // static |
| 64 bool MostVisitedTilesExperiment::IsDontShowOpenURLsEnabled() { |
| 65 return base::FieldTrialList::FindFullName(kMostVisitedFieldTrialName) == |
| 66 kDontShowOpenURLsGroupName; |
| 67 } |
| 68 |
| 69 // static |
| 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); |
| 77 else |
| 78 ++i; |
| 79 } |
| 80 } |
| 81 |
| 82 // static |
| 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; |
| 88 std::string url; |
| 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); |
| 93 } else { |
| 94 ++i; |
| 95 } |
| 96 } |
| 97 } |
| 98 |
| 99 // static |
| 100 void MostVisitedTilesExperiment::LogInHistogram( |
| 101 NtpTileExperimentActions action) { |
| 102 UMA_HISTOGRAM_ENUMERATION(kMostVisitedExperimentHistogramName, |
| 103 action, |
| 104 NUM_NTP_TILE_EXPERIMENT_ACTIONS); |
| 105 } |
| 106 |
| 107 // static |
| 108 bool MostVisitedTilesExperiment::ShouldRemoveURL( |
| 109 const std::set<std::string>& open_urls, |
| 110 const std::string& url, |
| 111 const size_t size) { |
| 112 if (open_urls.count(url) == 0) |
| 113 return false; |
| 114 |
| 115 if (size <= kMinUrlSuggestions) { |
| 116 LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_DID_NOT_REMOVE_URL); |
| 117 return false; |
| 118 } |
| 119 |
| 120 LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_REMOVED_URL); |
| 121 return true; |
| 122 } |
| 123 |
| 124 } // namespace history |
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