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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_DOWNLOAD_INTERNAL_COMMON_DOWNLOAD_DB_CACHE_H_
#define COMPONENTS_DOWNLOAD_INTERNAL_COMMON_DOWNLOAD_DB_CACHE_H_
#include <map>
#include <memory>
#include <optional>
#include <set>
#include <vector>
#include "base/memory/weak_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "base/timer/timer.h"
#include "components/download/public/common/download_export.h"
#include "components/download/public/common/download_item.h"
namespace download {
class DownloadDB;
struct DownloadDBEntry;
// Responsible for caching the metadata of all in progress downloads.
class COMPONENTS_DOWNLOAD_EXPORT DownloadDBCache
: public DownloadItem::Observer {
public:
explicit DownloadDBCache(std::unique_ptr<DownloadDB> download_db);
DownloadDBCache(const DownloadDBCache&) = delete;
DownloadDBCache& operator=(const DownloadDBCache&) = delete;
~DownloadDBCache() override;
using InitializeCallback =
base::OnceCallback<void(bool /* success */,
std::unique_ptr<std::vector<DownloadDBEntry>>)>;
void Initialize(InitializeCallback callback);
std::optional<DownloadDBEntry> RetrieveEntry(const std::string& guid);
void AddOrReplaceEntry(const DownloadDBEntry& entry);
// Remove an entry from the DownloadDB.
void RemoveEntry(const std::string& guid);
private:
friend class DownloadDBCacheTest;
friend class InProgressDownloadManager;
// Update all the entries in |download_db_|.
void UpdateDownloadDB();
// DownloadItem::Observer
void OnDownloadUpdated(DownloadItem* download) override;
void OnDownloadRemoved(DownloadItem* download) override;
// Called when the |download_db_| is initialized.
void OnDownloadDBInitialized(InitializeCallback callback, bool success);
// Called when all the download db entries are loaded.
void OnDownloadDBEntriesLoaded(
InitializeCallback callback,
bool success,
std::unique_ptr<std::vector<DownloadDBEntry>> entries);
void SetTimerTaskRunnerForTesting(
scoped_refptr<base::SequencedTaskRunner> task_runner);
// Whether this object has already been initialized.
bool initialized_;
// Database for storing in-progress metadata.
std::unique_ptr<DownloadDB> download_db_;
using DownloadDBEntryMap = std::map<std::string, DownloadDBEntry>;
// Entries that are currently being updated will be cached to reduce disk
// writing.
DownloadDBEntryMap cached_entries_;
// GUIDs of updated entries.
std::set<std::string> updated_guids_;
// Used to trigger db updates.
base::OneShotTimer update_timer_;
base::WeakPtrFactory<DownloadDBCache> weak_factory_{this};
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_INTERNAL_COMMON_DOWNLOAD_DB_CACHE_H_
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