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// Copyright 2019 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_LOADER_FETCHER_CACHE_H_
#define COBALT_LOADER_FETCHER_CACHE_H_
#include <atomic>
#include <memory>
#include <string>
#include "base/containers/hash_tables.h"
#include "base/memory/scoped_refptr.h"
#include "base/threading/thread_checker.h"
#include "cobalt/base/c_val.h"
#include "cobalt/loader/loader.h"
#include "net/base/linked_hash_map.h"
#include "net/http/http_response_headers.h"
#include "starboard/thread.h"
#include "url/gurl.h"
#include "url/origin.h"
namespace cobalt {
namespace loader {
// Manages a cache for data fetched by Fetchers.
class FetcherCache : public base::RefCountedThreadSafe<FetcherCache> {
public:
FetcherCache(const char* name, size_t capacity);
~FetcherCache();
Loader::FetcherCreator GetFetcherCreator(
const GURL& url, const Loader::FetcherCreator& real_fetcher_creator);
void NotifyResourceRequested(const std::string& url);
// To signal the imminent destruction of this object. If everything is
// working as expected, there shouldn't be any other reference of this object,
// and all usages of this object should be completed.
// TODO(b/270993319): For debugging cache integrity issues in production only,
// remove after identifying the root cause.
void DestroySoon();
private:
class CacheEntry;
std::unique_ptr<Fetcher> CreateCachedFetcher(
const GURL& url, const Loader::FetcherCreator& real_fetcher_creator,
Fetcher::Handler* handler);
void OnFetchSuccess(const std::string& url,
const scoped_refptr<net::HttpResponseHeaders>& headers,
const Origin& last_url_origin,
bool did_fail_from_transient_error, std::string data);
THREAD_CHECKER(thread_checker_);
// TODO(b/270993319): For debugging cache integrity issues in production only,
// remove after identifying the root cause.
const SbThreadId thread_id_ = SbThreadGetId();
std::atomic_bool destroy_soon_called_{false};
const size_t capacity_;
size_t total_size_ = 0;
net::linked_hash_map<std::string, CacheEntry*> cache_entries_;
base::CVal<base::cval::SizeInBytes, base::CValPublic> memory_size_in_bytes_;
base::CVal<int, base::CValPublic> count_resources_cached_;
};
} // namespace loader
} // namespace cobalt
#endif // COBALT_LOADER_FETCHER_CACHE_H_