| // Copyright 2013 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/history/most_visited_tiles_experiment.h" |
| |
| #include "base/metrics/field_trial.h" |
| #include "base/metrics/histogram.h" |
| #include "base/strings/string_util.h" |
| #include "chrome/common/instant_types.h" |
| |
| namespace history { |
| |
| namespace { |
| |
| // Constants for the most visited tile placement field trial. |
| // ex: |
| // "OneEightGroup_Flipped" --> Will cause tile 1 and 8 to be flipped. |
| // "OneEightGroup_NoChange" --> Will not flip anything. |
| // |
| // See field trial config (MostVisitedTilePlacement.json) for details. |
| const char kMostVisitedFieldTrialName[] = "MostVisitedTilePlacement"; |
| // Name of histogram tracking types of actions carried out by the field trial. |
| const char kMostVisitedExperimentHistogramName[] = |
| "NewTabPage.MostVisitedTilePlacementExperiment"; |
| const char kOneEightGroupPrefix[] = "OneEight"; |
| const char kOneFourGroupPrefix[] = "OneFour"; |
| const char kFlippedSuffix[] = "Flipped"; |
| const char kDontShowOpenURLsGroupName[] = "DontShowOpenTabs"; |
| // Minimum number of Most Visited suggestions required in order for the Most |
| // Visited Field Trial to remove a URL already open in the browser. |
| const size_t kMinUrlSuggestions = 8; |
| |
| } // namespace |
| |
| // static |
| void MostVisitedTilesExperiment::MaybeShuffle(MostVisitedURLList* data) { |
| const std::string group_name = |
| base::FieldTrialList::FindFullName(kMostVisitedFieldTrialName); |
| |
| // Depending on the study group of the client, we might flip the 1st and 4th |
| // tiles, or the 1st and 8th, or do nothing. |
| if (!EndsWith(group_name, kFlippedSuffix, true)) |
| return; |
| |
| size_t index_to_flip = 0; |
| if (StartsWithASCII(group_name, kOneEightGroupPrefix, true)) { |
| if (data->size() < 8) { |
| LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_8); |
| return; |
| } |
| index_to_flip = 7; |
| } else if (StartsWithASCII(group_name, kOneFourGroupPrefix, true)) { |
| if (data->size() < 4) { |
| LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_TOO_FEW_URLS_TILES_1_4); |
| return; |
| } |
| index_to_flip = 3; |
| } |
| std::swap((*data)[0], (*data)[index_to_flip]); |
| } |
| |
| // static |
| bool MostVisitedTilesExperiment::IsDontShowOpenURLsEnabled() { |
| return base::FieldTrialList::FindFullName(kMostVisitedFieldTrialName) == |
| kDontShowOpenURLsGroupName; |
| } |
| |
| // static |
| void MostVisitedTilesExperiment::RemoveItemsMatchingOpenTabs( |
| const std::set<std::string>& open_urls, |
| std::vector<InstantMostVisitedItem>* items) { |
| for (size_t i = 0; i < items->size(); ) { |
| const std::string& url = (*items)[i].url.spec(); |
| if (ShouldRemoveURL(open_urls, url, items->size())) |
| items->erase(items->begin() + i); |
| else |
| ++i; |
| } |
| } |
| |
| // static |
| void MostVisitedTilesExperiment::RemovePageValuesMatchingOpenTabs( |
| const std::set<std::string>& open_urls, |
| base::ListValue* pages_value) { |
| for (size_t i = 0; i < pages_value->GetSize(); ) { |
| base::DictionaryValue* page_value; |
| std::string url; |
| if (pages_value->GetDictionary(i, &page_value) && |
| page_value->GetString("url", &url) && |
| ShouldRemoveURL(open_urls, url, pages_value->GetSize())) { |
| pages_value->Remove(*page_value, &i); |
| } else { |
| ++i; |
| } |
| } |
| } |
| |
| // static |
| void MostVisitedTilesExperiment::LogInHistogram( |
| NtpTileExperimentActions action) { |
| UMA_HISTOGRAM_ENUMERATION(kMostVisitedExperimentHistogramName, |
| action, |
| NUM_NTP_TILE_EXPERIMENT_ACTIONS); |
| } |
| |
| // static |
| bool MostVisitedTilesExperiment::ShouldRemoveURL( |
| const std::set<std::string>& open_urls, |
| const std::string& url, |
| const size_t size) { |
| if (open_urls.count(url) == 0) |
| return false; |
| |
| if (size <= kMinUrlSuggestions) { |
| LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_DID_NOT_REMOVE_URL); |
| return false; |
| } |
| |
| LogInHistogram(NTP_TILE_EXPERIMENT_ACTION_REMOVED_URL); |
| return true; |
| } |
| |
| } // namespace history |