43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
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/**
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* A TEST MergeOperator for rocksdb/leveldb 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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#include "leveldb/merge_operator.h"
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#include "leveldb/slice.h"
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namespace leveldb {
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class StringAppendTESTOperator : public MergeOperator {
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public:
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StringAppendTESTOperator(char delim_char); /// Constructor with delimiter
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virtual bool Merge(const Slice& key,
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const Slice* existing_value,
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const std::deque<std::string>& operand_sequence,
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std::string* new_value,
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Logger* logger) const override;
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virtual bool PartialMerge(const Slice& key,
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const Slice& left_operand,
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const Slice& right_operand,
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std::string* new_value,
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Logger* logger) const override;
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virtual const char* Name() const override;
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private:
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char delim_; // The delimiter is inserted between elements
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};
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} // namespace leveldb
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