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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/services/app_service/public/cpp/icon_cache.h"
#include <utility>
#include "base/functional/callback.h"
#include "base/metrics/histogram_functions.h"
namespace apps {
void RecordIconLoadMethodMetrics(IconLoadingMethod icon_loading_method) {
base::UmaHistogramEnumeration("Apps.IconLoadingMethod", icon_loading_method);
}
IconCache::Value::Value()
: image_(), is_placeholder_icon_(false), ref_count_(0) {}
IconValuePtr IconCache::Value::AsIconValue(IconType icon_type) {
auto icon_value = std::make_unique<IconValue>();
icon_value->icon_type = icon_type;
icon_value->uncompressed = image_;
icon_value->is_placeholder_icon = is_placeholder_icon_;
return icon_value;
}
IconCache::IconCache(IconLoader* wrapped_loader,
GarbageCollectionPolicy gc_policy)
: wrapped_loader_(wrapped_loader), gc_policy_(gc_policy) {}
IconCache::~IconCache() = default;
std::optional<IconKey> IconCache::GetIconKey(const std::string& id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return wrapped_loader_ ? wrapped_loader_->GetIconKey(id) : std::nullopt;
}
std::unique_ptr<IconLoader::Releaser> IconCache::LoadIconFromIconKey(
const std::string& id,
const IconKey& icon_key,
IconType icon_type,
int32_t size_hint_in_dip,
bool allow_placeholder_icon,
apps::LoadIconCallback callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
IconLoader::Key key(
id, icon_key, icon_type, size_hint_in_dip,
// We pass false instead of allow_placeholder_icon, as the Value
// already records placeholder-ness. If the allow_placeholder_icon
// arg to this function is true, we can re-use a cache hit regardless
// of whether the previous call to the underlying wrapped_loader_
// returned the placeholder icon or the real icon, so we don't want
// to restrict our map lookup to only one flavor.
false);
Value* cache_hit = nullptr;
bool ref_count_incremented = false;
if (icon_type == IconType::kUncompressed ||
icon_type == IconType::kStandard) {
auto iter = map_.find(key);
if (iter == map_.end()) {
iter = map_.insert(std::make_pair(key, Value())).first;
} else if (!iter->second.image_.isNull() &&
(allow_placeholder_icon || !iter->second.is_placeholder_icon_)) {
cache_hit = &iter->second;
}
auto new_ref_count = ++iter->second.ref_count_;
CHECK(new_ref_count != std::numeric_limits<decltype(new_ref_count)>::max());
ref_count_incremented = true;
}
std::unique_ptr<IconLoader::Releaser> releaser(nullptr);
if (cache_hit) {
RecordIconLoadMethodMetrics(IconLoadingMethod::kFromCache);
std::move(callback).Run(cache_hit->AsIconValue(icon_type));
} else if (wrapped_loader_) {
releaser = wrapped_loader_->LoadIconFromIconKey(
id, icon_key, icon_type, size_hint_in_dip, allow_placeholder_icon,
base::BindOnce(&IconCache::OnLoadIcon, weak_ptr_factory_.GetWeakPtr(),
key, std::move(callback)));
} else {
std::move(callback).Run(std::make_unique<IconValue>());
}
return ref_count_incremented
? std::make_unique<IconLoader::Releaser>(
std::move(releaser),
base::BindOnce(&IconCache::OnRelease,
weak_ptr_factory_.GetWeakPtr(),
std::move(key)))
: std::move(releaser);
}
void IconCache::SweepReleasedIcons() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (gc_policy_ != GarbageCollectionPolicy::kExplicit) {
return;
}
auto iter = map_.begin();
while (iter != map_.end()) {
if (iter->second.ref_count_ == 0) {
iter = map_.erase(iter);
} else {
++iter;
}
}
}
void IconCache::RemoveIcon(const std::string& id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (gc_policy_ != GarbageCollectionPolicy::kExplicit) {
return;
}
auto iter = map_.begin();
while (iter != map_.end()) {
if (iter->first.id_ == id) {
iter = map_.erase(iter);
} else {
++iter;
}
}
}
void IconCache::Update(const IconLoader::Key& key,
const IconValue& icon_value) {
if (icon_value.icon_type != IconType::kUncompressed &&
icon_value.icon_type != IconType::kStandard) {
return;
}
auto iter = map_.find(key);
if (iter == map_.end()) {
return;
}
// Don't let a placeholder overwrite a real icon.
if (icon_value.is_placeholder_icon && !iter->second.is_placeholder_icon_) {
return;
}
iter->second.image_ = icon_value.uncompressed;
}
void IconCache::OnLoadIcon(const IconLoader::Key& key,
apps::LoadIconCallback callback,
IconValuePtr icon_value) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
Update(key, *icon_value);
std::move(callback).Run(std::move(icon_value));
}
void IconCache::OnRelease(IconLoader::Key key) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto iter = map_.find(key);
if (iter == map_.end()) {
return;
}
auto n = iter->second.ref_count_;
if (n > 0) {
n--;
}
iter->second.ref_count_ = n;
if ((n == 0) && (gc_policy_ == GarbageCollectionPolicy::kEager)) {
map_.erase(iter);
}
}
} // namespace apps
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