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accd3debbb
Summary:
Implemented the StringAppendOperator class (subclass of MergeOperator).
Found in utilities/merge_operators/string_append/stringappend.{h,cc}
It is a rocksdb Merge Operator that supports string/list concatenation
with a configurable delimiter.
The tests are found in .../stringappend_test.cc. It implements a
map : key -> (list of strings), with core operations Append(list_key,val)
and Get(list_key).
Test Plan:
1. Navigate to your rocksdb repository
2. Execute: make stringappend_test (to compile)
3. Execute: ./stringappend_test (to run the tests)
4. Execute: make all check (to test the ENTIRE rocksdb codebase / regression)
Reviewers: haobo, dhruba, zshao
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D10737
32 lines
759 B
C++
32 lines
759 B
C++
/**
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* A MergeOperator for rocksdb/leveldb that implements string append.
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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 StringAppendOperator : public MergeOperator {
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public:
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StringAppendOperator(char delim_char); /// Constructor: specify delimiter
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virtual void Merge(const Slice& key,
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const Slice* existing_value,
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const Slice& value,
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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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