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rocksdb

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RocksDB for Erlang

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rocksdb deps rocksdb table block_builder.h
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deps/rocksdb/table/block_builder.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 <vector>



#include <stdint.h>

#include "rocksdb/slice.h"



namespace rocksdb {



class BlockBuilder {

 public:

  BlockBuilder(const BlockBuilder&) = delete;

  void operator=(const BlockBuilder&) = delete;



  explicit BlockBuilder(int block_restart_interval,

                        bool use_delta_encoding = true);



  // Reset the contents as if the BlockBuilder was just constructed.

  void Reset();



  // REQUIRES: Finish() has not been called since the last call to Reset().

  // REQUIRES: key is larger than any previously added key

  void Add(const Slice& key, const Slice& value);



  // Finish building the block and return a slice that refers to the

  // block contents.  The returned slice will remain valid for the

  // lifetime of this builder or until Reset() is called.

  Slice Finish();



  // Returns an estimate of the current (uncompressed) size of the block

  // we are building.

  inline size_t CurrentSizeEstimate() const { return estimate_; }



  // Returns an estimated block size after appending key and value.

  size_t EstimateSizeAfterKV(const Slice& key, const Slice& value) const;



  // Return true iff no entries have been added since the last Reset()

  bool empty() const {

    return buffer_.empty();

  }



 private:

  const int          block_restart_interval_;

  const bool         use_delta_encoding_;



  std::string           buffer_;    // Destination buffer

  std::vector<uint32_t> restarts_;  // Restart points

  size_t                estimate_;

  int                   counter_;   // Number of entries emitted since restart

  bool                  finished_;  // Has Finish() been called?

  std::string           last_key_;

};



}  // namespace rocksdb