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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_LEVELDB_PROTO_INTERNAL_MIGRATION_DELEGATE_H_
#define COMPONENTS_LEVELDB_PROTO_INTERNAL_MIGRATION_DELEGATE_H_
#include <memory>
#include "base/functional/callback.h"
#include "components/leveldb_proto/internal/proto_leveldb_wrapper.h"
#include "components/leveldb_proto/internal/unique_proto_database.h"
namespace leveldb_proto {
// Small class that strictly performs the migration functionality of
// SharedProtoDatabase.
class MigrationDelegate {
public:
using MigrationCallback = base::OnceCallback<void(bool)>;
MigrationDelegate();
~MigrationDelegate();
// Copies the keys/entries of |from| to |to|, and returns a boolean success
// in |callback|.
void DoMigration(UniqueProtoDatabase* from,
UniqueProtoDatabase* to,
MigrationCallback callback);
private:
void OnLoadKeysAndEntries(MigrationCallback callback,
UniqueProtoDatabase* to,
bool success,
std::unique_ptr<KeyValueMap> keys_entries);
void OnUpdateEntries(MigrationCallback callback, bool success);
base::WeakPtrFactory<MigrationDelegate> weak_ptr_factory_{this};
};
} // namespace leveldb_proto
#endif // COMPONENTS_LEVELDB_PROTO_INTERNAL_MIGRATION_DELEGATE_H_
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