6c2bf9e916
Summary: internal task: T35568575 Pull Request resolved: https://github.com/facebook/rocksdb/pull/5199 Differential Revision: D14962794 Pulled By: gfosco fbshipit-source-id: 93838ede6d0235eaecff90d200faed9a8515bbbe
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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/**
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* A TEST MergeOperator for rocksdb that implements string append.
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* It is built using the MergeOperator interface rather than the simpler
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* AssociativeMergeOperator interface. This is useful for testing/benchmarking.
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* While the two operators are semantically the same, all production code
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* should use the StringAppendOperator defined in stringappend.{h,cc}. The
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* operator defined in the present file is primarily for testing.
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*
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* @author Deon Nicholas (dnicholas@fb.com)
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* Copyright 2013 Facebook
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*/
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#pragma once
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#include <deque>
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#include <string>
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/slice.h"
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namespace rocksdb {
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class StringAppendTESTOperator : public MergeOperator {
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public:
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// Constructor with delimiter
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explicit StringAppendTESTOperator(char delim_char);
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virtual bool FullMergeV2(const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) const override;
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virtual bool PartialMergeMulti(const Slice& key,
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const std::deque<Slice>& operand_list,
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std::string* new_value, Logger* logger) const
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override;
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virtual const char* Name() const override;
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private:
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// A version of PartialMerge that actually performs "partial merging".
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// Use this to simulate the exact behaviour of the StringAppendOperator.
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bool _AssocPartialMergeMulti(const Slice& key,
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const std::deque<Slice>& operand_list,
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std::string* new_value, Logger* logger) const;
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char delim_; // The delimiter is inserted between elements
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};
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} // namespace rocksdb
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