//  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"

#include "db/snapshot_checker.h"

namespace ROCKSDB_NAMESPACE {

class UniversalCompactionPicker : public CompactionPicker {

 public:

  UniversalCompactionPicker(const ImmutableOptions& ioptions,

                            const InternalKeyComparator* icmp)

      : CompactionPicker(ioptions, icmp) {}

  // If `require_max_output_level` is true, only pick compaction

  // with max output level or return nullptr if no such compaction exists.

  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;

  int MaxOutputLevel() const override { return NumberLevels() - 1; }

  bool NeedsCompaction(const VersionStorageInfo* vstorage) const override;

};

}  // namespace ROCKSDB_NAMESPACE