// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 __LOG_LEVELDB_HPP__
#define __LOG_LEVELDB_HPP__

#include <leveldb/db.h>

#include <stdint.h>

#include <stout/option.hpp>

#include "log/storage.hpp"

namespace mesos {
namespace internal {
namespace log {

// Concrete implementation of the storage interface using leveldb.
class LevelDBStorage : public Storage
{
public:
  LevelDBStorage();
  ~LevelDBStorage() override;

  Try<State> restore(const std::string& path) override;
  Try<Nothing> persist(const Metadata& metadata) override;
  Try<Nothing> persist(const Action& action) override;
  Try<Action> read(uint64_t position) override;

private:
  leveldb::DB* db;

  // First position still in leveldb, used during truncation.
  Option<uint64_t> first;
};

} // namespace log {
} // namespace internal {
} // namespace mesos {

#endif // __LOG_LEVELDB_HPP__