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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_IMPL_H_
#define CHROME_BROWSER_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_IMPL_H_
#include <vector>
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "components/leveldb_proto/proto_database.h"
#include "components/offline_pages/offline_page_metadata_store.h"
namespace base {
class FilePath;
}
namespace offline_pages {
class OfflinePageEntry;
// Implements OfflinePageMetadataStore using leveldb_proto::ProtoDatabase
// component. Stores metadata of offline pages as serialized protobufs in a
// LevelDB key/value pairs.
// Underlying implementation guarantees that all of the method calls will be
// executed sequentially, and started operations will finish even after the
// store is already destroyed (callbacks will be called).
class OfflinePageMetadataStoreImpl : public OfflinePageMetadataStore {
public:
OfflinePageMetadataStoreImpl(
scoped_ptr<leveldb_proto::ProtoDatabase<OfflinePageEntry>> database,
const base::FilePath& database_dir);
~OfflinePageMetadataStoreImpl() override;
// OfflinePageMetadataStore implementation:
void Load(const LoadCallback& callback) override;
void AddOfflinePage(const OfflinePageItem& offline_page_record,
const UpdateCallback& callback) override;
void RemoveOfflinePage(const GURL& page_url,
const UpdateCallback& callback) override;
private:
// Callback for when initialization of the |database_| is done.
void OnInitDone(bool success);
// Implements the update.
void UpdateEntries(
scoped_ptr<leveldb_proto::ProtoDatabase<OfflinePageEntry>::KeyEntryVector>
entries_to_save,
scoped_ptr<std::vector<std::string>> keys_to_remove,
const UpdateCallback& callback);
// Resets the database. This is to be used when one of the operations fails
// with no good explanation.
void ResetDB();
scoped_ptr<leveldb_proto::ProtoDatabase<OfflinePageEntry>> database_;
base::WeakPtrFactory<OfflinePageMetadataStoreImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(OfflinePageMetadataStoreImpl);
};
} // namespace offline_pages
#endif // CHROME_BROWSER_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_IMPL_H_
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