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RocksDB for Erlang

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rocksdb deps rocksdb db compaction compaction_picker_fifo.h
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deps/rocksdb/db/compaction/compaction_picker_fifo.h 

//  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,

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

      const SnapshotChecker* /* snapshot_checker */,

      VersionStorageInfo* version, LogBuffer* log_buffer,

      bool /* require_max_output_level*/ = false) override;



  Compaction* PickCompactionForCompactRange(

      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);



  // Will pick one file to compact at a time, starting from the oldest file.

  Compaction* PickTemperatureChangeCompaction(

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

      const MutableDBOptions& mutable_db_options, VersionStorageInfo* vstorage,

      LogBuffer* log_buffer) const;

};

}  // namespace ROCKSDB_NAMESPACE