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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/app_list/search/burn_in_controller.h"
#include "base/containers/flat_set.h"
#include "chrome/browser/ash/app_list/search/chrome_search_result.h"
namespace app_list {
constexpr base::TimeDelta kBurnInPeriod = base::Milliseconds(200);
BurnInController::BurnInController(BurnInPeriodElapsedCallback callback)
: burn_in_period_elapsed_callback_(std::move(callback)),
burn_in_period_(kBurnInPeriod) {}
void BurnInController::Start() {
burn_in_timer_.Start(FROM_HERE, burn_in_period_,
burn_in_period_elapsed_callback_);
session_start_ = base::Time::Now();
burn_in_iteration_counter_ = 0;
ids_to_burn_in_iteration_.clear();
}
BurnInController::~BurnInController() = default;
void BurnInController::Stop() {
burn_in_timer_.Stop();
}
bool BurnInController::UpdateResults(ResultsMap& results,
CategoriesList& categories,
ash::AppListSearchResultType result_type) {
// True if the burn-in period has elapsed.
const bool is_post_burn_in =
base::Time::Now() - session_start_ > burn_in_period_;
if (is_post_burn_in) {
++burn_in_iteration_counter_;
}
// Record the burn-in iteration number for categories we are seeing for the
// first time in this search.
base::flat_set<Category> updated_categories;
for (const auto& result : results[result_type]) {
updated_categories.insert(result->category());
}
for (auto& category : categories) {
const auto it = updated_categories.find(category.category);
if (it != updated_categories.end() && category.burn_in_iteration == -1) {
category.burn_in_iteration = burn_in_iteration_counter_;
}
}
// Record-keeping for the burn-in iteration number of individual results.
const auto it = results.find(result_type);
DCHECK(it != results.end());
for (const auto& result : it->second) {
const std::string result_id = result->id();
if (ids_to_burn_in_iteration_.find(result_id) !=
ids_to_burn_in_iteration_.end()) {
// Result has been seen before. Set burn_in_iteration, since the result
// object has changed since last seen.
result->scoring().set_burn_in_iteration(
ids_to_burn_in_iteration_[result_id]);
} else {
result->scoring().set_burn_in_iteration(burn_in_iteration_counter_);
ids_to_burn_in_iteration_[result_id] = burn_in_iteration_counter_;
}
}
return is_post_burn_in;
}
} // namespace app_list
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