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RocksDB for Erlang

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rocksdb deps rocksdb utilities merge_operators string_append stringappend2.h
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deps/rocksdb/utilities/merge_operators/string_append/stringappend2.h 

// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.

/**

 * A TEST MergeOperator for rocksdb that implements string append.

 * It is built using the MergeOperator interface rather than the simpler

 * AssociativeMergeOperator interface. This is useful for testing/benchmarking.

 * While the two operators are semantically the same, all production code

 * should use the StringAppendOperator defined in stringappend.{h,cc}. The

 * operator defined in the present file is primarily for testing.

 *

 * @author Deon Nicholas (dnicholas@fb.com)

 * Copyright 2013 Facebook

 */



#pragma once

#include <deque>

#include <string>



#include "rocksdb/merge_operator.h"

#include "rocksdb/slice.h"



namespace ROCKSDB_NAMESPACE {



class StringAppendTESTOperator : public MergeOperator {

 public:

  // Constructor with delimiter

  explicit StringAppendTESTOperator(char delim_char);

  explicit StringAppendTESTOperator(const std::string& delim);



  bool FullMergeV2(const MergeOperationInput& merge_in,

                   MergeOperationOutput* merge_out) const override;



  bool PartialMergeMulti(const Slice& key,

                         const std::deque<Slice>& operand_list,

                         std::string* new_value, Logger* logger) const override;



  static const char* kClassName() { return "StringAppendTESTOperator"; }

  static const char* kNickName() { return "stringappendtest"; }

  const char* Name() const override { return kClassName(); }

  const char* NickName() const override { return kNickName(); }



 private:

  // A version of PartialMerge that actually performs "partial merging".

  // Use this to simulate the exact behaviour of the StringAppendOperator.

  bool _AssocPartialMergeMulti(const Slice& key,

                               const std::deque<Slice>& operand_list,

                               std::string* new_value, Logger* logger) const;



  std::string delim_;  // The delimiter is inserted between elements

};



}  // namespace ROCKSDB_NAMESPACE