//  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 {

class FIFOCompactionPicker : public CompactionPicker {

 public:

  FIFOCompactionPicker(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,

                             VersionStorageInfo* version,

                             LogBuffer* log_buffer) override;

  Compaction* CompactRange(const std::string& cf_name,

                           const MutableCFOptions& mutable_cf_options,

                           const MutableDBOptions& mutable_db_options,

                           VersionStorageInfo* vstorage, int input_level,

                           int output_level,

                           const CompactRangeOptions& compact_range_options,

                           const InternalKey* begin, const InternalKey* end,

                           InternalKey** compaction_end, bool* manual_conflict,

                           uint64_t max_file_num_to_ignore,

                           const std::string& trim_ts) override;

  // The maximum allowed output level.  Always returns 0.

  int MaxOutputLevel() const override { return 0; }

  bool NeedsCompaction(const VersionStorageInfo* vstorage) const override;

 private:

  Compaction* PickTTLCompaction(const std::string& cf_name,

                                const MutableCFOptions& mutable_cf_options,

                                const MutableDBOptions& mutable_db_options,

                                VersionStorageInfo* version,

                                LogBuffer* log_buffer);

  Compaction* PickSizeCompaction(const std::string& cf_name,

                                 const MutableCFOptions& mutable_cf_options,

                                 const MutableDBOptions& mutable_db_options,

                                 VersionStorageInfo* version,

                                 LogBuffer* log_buffer);

  Compaction* PickTemperatureChangeCompaction(

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

      const MutableDBOptions& mutable_db_options, VersionStorageInfo* vstorage,

      LogBuffer* log_buffer);

};

}  // namespace ROCKSDB_NAMESPACE