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// Copyright 2025 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/persistent_cache/persistent_cache_collection.h"
#include <memory>
#include "components/persistent_cache/backend_params.h"
#include "components/persistent_cache/backend_params_manager.h"
#include "components/persistent_cache/entry.h"
#include "components/persistent_cache/persistent_cache.h"
namespace {
constexpr size_t kLruCacheCapacity = 100;
// Reducing the footprint of the collection to exactly the desired target could
// have the effect of rapidly going over the limit again. This might end up
// issuing more reductions than desirable. This defines some headroom to try and
// mitigate the issue.
constexpr int64_t kFootPrintReductionHeadroomPercent = 10;
} // namespace
namespace persistent_cache {
PersistentCacheCollection::PersistentCacheCollection(
std::unique_ptr<BackendParamsManager> backend_params_manager,
int64_t target_footprint)
: backend_params_manager_(std::move(backend_params_manager)),
persistent_caches_(kLruCacheCapacity),
target_footprint_(target_footprint) {
ReduceFootPrint();
}
PersistentCacheCollection::~PersistentCacheCollection() = default;
std::unique_ptr<Entry> PersistentCacheCollection::Find(
const std::string& cache_id,
std::string_view key) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return GetOrCreateCache(cache_id)->Find(key);
}
void PersistentCacheCollection::ReduceFootPrint() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Clear all managed persistent caches so they don't hold on to files or
// prevent their deletion.
persistent_caches_.Clear();
int64_t adjusted_target =
target_footprint_ * (100 - kFootPrintReductionHeadroomPercent) / 100;
int64_t current_footprint =
backend_params_manager_->BringDownTotalFootprintOfFiles(adjusted_target)
.current_footprint;
bytes_until_footprint_reduction_ = target_footprint_ - current_footprint;
}
void PersistentCacheCollection::Insert(const std::string& cache_id,
std::string_view key,
base::span<const uint8_t> content,
EntryMetadata metadata) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Approximate the footprint of this insert to the size of the key and value
// combined. This is optimistic in some ways since it doesn't account for any
// overhead and pessimimistic as it assumes every single write is both new and
// doesn't evict something else.
bytes_until_footprint_reduction_ -= (key.size() + content.size());
if (bytes_until_footprint_reduction_ <= 0) {
ReduceFootPrint();
}
GetOrCreateCache(cache_id)->Insert(key, content, metadata);
}
void PersistentCacheCollection::ClearForTesting() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
persistent_caches_.Clear();
}
void PersistentCacheCollection::DeleteAllFiles() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Clear all managed persistent caches so they don't hold on to files or
// prevent their deletion.
persistent_caches_.Clear();
backend_params_manager_->DeleteAllFiles();
}
PersistentCache* PersistentCacheCollection::GetOrCreateCache(
const std::string& cache_id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto it = persistent_caches_.Get(cache_id);
// If the cache is already created.
if (it != persistent_caches_.end()) {
return it->second.get();
}
// Create the cache
// TODO(crbug.com/377475540): Currently this class is deeply tied to the
// sqlite implementation. Once the conversion to and from mojo types is
// implemented this class should get a way to select the desired backend type.
// TODO: Allow choosing the desired access rights.
auto inserted_it = persistent_caches_.Put(
cache_id,
PersistentCache::Open(backend_params_manager_->GetOrCreateParamsSync(
BackendType::kSqlite, cache_id,
BackendParamsManager::AccessRights::kReadWrite)));
return inserted_it->second.get();
}
} // namespace persistent_cache
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