//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.

//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).

//

// Copyright (c) 2011 The LevelDB Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file. See the AUTHORS file for names of contributors.

#pragma once

#include "db/compaction/compaction_picker.h"

namespace ROCKSDB_NAMESPACE {

// Picking compactions for leveled compaction. See wiki page

// https://github.com/facebook/rocksdb/wiki/Leveled-Compaction

// for description of Leveled compaction.

class LevelCompactionPicker : public CompactionPicker {

 public:

  LevelCompactionPicker(const ImmutableOptions& ioptions,

                        const InternalKeyComparator* icmp)

      : CompactionPicker(ioptions, icmp) {}

  Compaction* PickCompaction(

      const std::string& cf_name, const MutableCFOptions& mutable_cf_options,

      const MutableDBOptions& mutable_db_options,

      const std::vector<SequenceNumber>& /* existing_snapshots */,

      const SnapshotChecker* /* snapshot_checker */,

      VersionStorageInfo* vstorage, LogBuffer* log_buffer,

      const std::string& full_history_ts_low,

      bool /*require_max_output_level*/ = false) override;

  bool NeedsCompaction(const VersionStorageInfo* vstorage) const override;

};

}  // namespace ROCKSDB_NAMESPACE