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// Copyright 2014 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 COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_H_
#define COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_H_
#include <string>
#include <utility>
#include <vector>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
namespace leveldb_proto {
// Interface for classes providing persistent storage of Protocol Buffer
// entries (T must be a Proto type extending MessageLite).
template <typename T>
class ProtoDatabase {
public:
typedef base::Callback<void(bool success)> InitCallback;
typedef base::Callback<void(bool success)> UpdateCallback;
typedef base::Callback<void(bool success, scoped_ptr<std::vector<T> >)>
LoadCallback;
// A list of key-value (string, T) tuples.
typedef std::vector<std::pair<std::string, T> > KeyEntryVector;
virtual ~ProtoDatabase() {}
// Asynchronously initializes the object. |callback| will be invoked on the
// calling thread when complete.
virtual void Init(const base::FilePath& database_dir,
InitCallback callback) = 0;
// Asynchronously saves |entries_to_save| and deletes entries from
// |keys_to_remove| from the database. |callback| will be invoked on the
// calling thread when complete.
virtual void UpdateEntries(
scoped_ptr<KeyEntryVector> entries_to_save,
scoped_ptr<std::vector<std::string> > keys_to_remove,
UpdateCallback callback) = 0;
// Asynchronously loads all entries from the database and invokes |callback|
// when complete.
virtual void LoadEntries(LoadCallback callback) = 0;
};
} // namespace leveldb_proto
#endif // COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_H_
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